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Commit 6713ba4c authored by bellard's avatar bellard
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removing unused stuff 


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1544 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
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libavformat/libpng/png.c deleted 100644 → 0
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/* png.c - location for general purpose libpng functions
*
* libpng version 1.0.15 - October 3, 2002
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
*/
#define PNG_INTERNAL
#define PNG_NO_EXTERN
#include "png.h"
/* Generate a compiler error if there is an old png.h in the search path. */
typedef version_1_0_15 Your_png_h_is_not_version_1_0_15;
/* Version information for C files. This had better match the version
* string defined in png.h. */
#ifdef PNG_USE_GLOBAL_ARRAYS
/* png_libpng_ver was changed to a function in version 1.0.5c */
const char png_libpng_ver[18] = "1.0.15";
/* png_sig was changed to a function in version 1.0.5c */
/* Place to hold the signature string for a PNG file. */
const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
/* Invoke global declarations for constant strings for known chunk types */
PNG_IHDR;
PNG_IDAT;
PNG_IEND;
PNG_PLTE;
PNG_bKGD;
PNG_cHRM;
PNG_gAMA;
PNG_hIST;
PNG_iCCP;
PNG_iTXt;
PNG_oFFs;
PNG_pCAL;
PNG_sCAL;
PNG_pHYs;
PNG_sBIT;
PNG_sPLT;
PNG_sRGB;
PNG_tEXt;
PNG_tIME;
PNG_tRNS;
PNG_zTXt;
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* width of interlace block (used in assembler routines only) */
#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
#endif
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
*/
/* Mask to determine which pixels are valid in a pass */
const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
/* Mask to determine which pixels to overwrite while displaying */
const int FARDATA png_pass_dsp_mask[]
= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
#endif
/* Checks whether the supplied bytes match the PNG signature. We allow
* checking less than the full 8-byte signature so that those apps that
* already read the first few bytes of a file to determine the file type
* can simply check the remaining bytes for extra assurance. Returns
* an integer less than, equal to, or greater than zero if sig is found,
* respectively, to be less than, to match, or be greater than the correct
* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
*/
int PNGAPI
png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
{
png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
if (num_to_check > 8)
num_to_check = 8;
else if (num_to_check < 1)
return (0);
if (start > 7)
return (0);
if (start + num_to_check > 8)
num_to_check = 8 - start;
return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
}
/* Function to allocate memory for zlib and clear it to 0. */
#ifdef PNG_1_0_X
voidpf PNGAPI
#else
voidpf /* private */
#endif
png_zalloc(voidpf png_ptr, uInt items, uInt size)
{
png_uint_32 num_bytes = (png_uint_32)items * size;
png_voidp ptr;
png_structp p=png_ptr;
png_uint_32 save_flags=p->flags;
p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
p->flags=save_flags;
#ifndef PNG_NO_ZALLOC_ZERO
if (ptr == NULL)
return ((voidpf)ptr);
if (num_bytes > (png_uint_32)0x8000L)
{
png_memset(ptr, 0, (png_size_t)0x8000L);
png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
(png_size_t)(num_bytes - (png_uint_32)0x8000L));
}
else
{
png_memset(ptr, 0, (png_size_t)num_bytes);
}
#endif
return ((voidpf)ptr);
}
/* function to free memory for zlib */
#ifdef PNG_1_0_X
void PNGAPI
#else
void /* private */
#endif
png_zfree(voidpf png_ptr, voidpf ptr)
{
png_free((png_structp)png_ptr, (png_voidp)ptr);
}
/* Reset the CRC variable to 32 bits of 1's. Care must be taken
* in case CRC is > 32 bits to leave the top bits 0.
*/
void /* PRIVATE */
png_reset_crc(png_structp png_ptr)
{
png_ptr->crc = crc32(0, Z_NULL, 0);
}
/* Calculate the CRC over a section of data. We can only pass as
* much data to this routine as the largest single buffer size. We
* also check that this data will actually be used before going to the
* trouble of calculating it.
*/
void /* PRIVATE */
png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
{
int need_crc = 1;
if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
{
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
need_crc = 0;
}
else /* critical */
{
if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
need_crc = 0;
}
if (need_crc)
png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
}
void PNGAPI
png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
int num)
{
png_debug(1, "in png_free_data\n");
if (png_ptr == NULL || info_ptr == NULL)
return;
#if defined(PNG_TEXT_SUPPORTED)
/* free text item num or (if num == -1) all text items */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
#else
if (mask & PNG_FREE_TEXT)
#endif
{
if (num != -1)
{
if (info_ptr->text && info_ptr->text[num].key)
{
png_free(png_ptr, info_ptr->text[num].key);
info_ptr->text[num].key = NULL;
}
}
else
{
int i;
for (i = 0; i < info_ptr->num_text; i++)
png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
png_free(png_ptr, info_ptr->text);
info_ptr->text = NULL;
info_ptr->num_text=0;
}
}
#endif
#if defined(PNG_tRNS_SUPPORTED)
/* free any tRNS entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
#endif
{
png_free(png_ptr, info_ptr->trans);
info_ptr->valid &= ~PNG_INFO_tRNS;
#ifndef PNG_FREE_ME_SUPPORTED
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
#endif
info_ptr->trans = NULL;
}
#endif
#if defined(PNG_sCAL_SUPPORTED)
/* free any sCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
#else
if (mask & PNG_FREE_SCAL)
#endif
{
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, info_ptr->scal_s_width);
png_free(png_ptr, info_ptr->scal_s_height);
info_ptr->scal_s_width = NULL;
info_ptr->scal_s_height = NULL;
#endif
info_ptr->valid &= ~PNG_INFO_sCAL;
}
#endif
#if defined(PNG_pCAL_SUPPORTED)
/* free any pCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
#else
if (mask & PNG_FREE_PCAL)
#endif
{
png_free(png_ptr, info_ptr->pcal_purpose);
png_free(png_ptr, info_ptr->pcal_units);
info_ptr->pcal_purpose = NULL;
info_ptr->pcal_units = NULL;
if (info_ptr->pcal_params != NULL)
{
int i;
for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
{
png_free(png_ptr, info_ptr->pcal_params[i]);
info_ptr->pcal_params[i]=NULL;
}
png_free(png_ptr, info_ptr->pcal_params);
info_ptr->pcal_params = NULL;
}
info_ptr->valid &= ~PNG_INFO_pCAL;
}
#endif
#if defined(PNG_iCCP_SUPPORTED)
/* free any iCCP entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
#else
if (mask & PNG_FREE_ICCP)
#endif
{
png_free(png_ptr, info_ptr->iccp_name);
png_free(png_ptr, info_ptr->iccp_profile);
info_ptr->iccp_name = NULL;
info_ptr->iccp_profile = NULL;
info_ptr->valid &= ~PNG_INFO_iCCP;
}
#endif
#if defined(PNG_sPLT_SUPPORTED)
/* free a given sPLT entry, or (if num == -1) all sPLT entries */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
#else
if (mask & PNG_FREE_SPLT)
#endif
{
if (num != -1)
{
if(info_ptr->splt_palettes)
{
png_free(png_ptr, info_ptr->splt_palettes[num].name);
png_free(png_ptr, info_ptr->splt_palettes[num].entries);
info_ptr->splt_palettes[num].name = NULL;
info_ptr->splt_palettes[num].entries = NULL;
}
}
else
{
if(info_ptr->splt_palettes_num)
{
int i;
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
png_free(png_ptr, info_ptr->splt_palettes);
info_ptr->splt_palettes = NULL;
info_ptr->splt_palettes_num = 0;
}
info_ptr->valid &= ~PNG_INFO_sPLT;
}
}
#endif
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
#else
if (mask & PNG_FREE_UNKN)
#endif
{
if (num != -1)
{
if(info_ptr->unknown_chunks)
{
png_free(png_ptr, info_ptr->unknown_chunks[num].data);
info_ptr->unknown_chunks[num].data = NULL;
}
}
else
{
int i;
if(info_ptr->unknown_chunks_num)
{
for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks = NULL;
info_ptr->unknown_chunks_num = 0;
}
}
}
#endif
#if defined(PNG_hIST_SUPPORTED)
/* free any hIST entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
#endif
{
png_free(png_ptr, info_ptr->hist);
info_ptr->hist = NULL;
info_ptr->valid &= ~PNG_INFO_hIST;
#ifndef PNG_FREE_ME_SUPPORTED
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
#endif
}
#endif
/* free any PLTE entry that was internally allocated */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
#endif
{
png_zfree(png_ptr, info_ptr->palette);
info_ptr->palette = NULL;
info_ptr->valid &= ~PNG_INFO_PLTE;
#ifndef PNG_FREE_ME_SUPPORTED
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
#endif
info_ptr->num_palette = 0;
}
#if defined(PNG_INFO_IMAGE_SUPPORTED)
/* free any image bits attached to the info structure */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
#else
if (mask & PNG_FREE_ROWS)
#endif
{
if(info_ptr->row_pointers)
{
int row;
for (row = 0; row < (int)info_ptr->height; row++)
{
png_free(png_ptr, info_ptr->row_pointers[row]);
info_ptr->row_pointers[row]=NULL;
}
png_free(png_ptr, info_ptr->row_pointers);
info_ptr->row_pointers=NULL;
}
info_ptr->valid &= ~PNG_INFO_IDAT;
}
#endif
#ifdef PNG_FREE_ME_SUPPORTED
if(num == -1)
info_ptr->free_me &= ~mask;
else
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
#endif
}
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
int PNGAPI
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
{
/* check chunk_name and return "keep" value if it's on the list, else 0 */
int i;
png_bytep p;
if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
return 0;
p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
for (i = png_ptr->num_chunk_list; i; i--, p-=5)
if (!png_memcmp(chunk_name, p, 4))
return ((int)*(p+4));
return 0;
}
#endif
void png_info_init(png_info *info_ptr)
{
memset(info_ptr, 0, sizeof(png_info));
}
libavformat/libpng/png.h deleted 100644 → 0
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libavformat/libpng/pngconf.h deleted 100644 → 0
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/* pngconf.h - machine configurable file for libpng
*
* libpng 1.0.15 - October 3, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
/* Any machine specific code is near the front of this file, so if you
* are configuring libpng for a machine, you may want to read the section
* starting here down to where it starts to typedef png_color, png_text,
* and png_info.
*/
#ifndef PNGCONF_H
#define PNGCONF_H
#define PNG_1_0_X
/* This is the size of the compression buffer, and thus the size of
* an IDAT chunk. Make this whatever size you feel is best for your
* machine. One of these will be allocated per png_struct. When this
* is full, it writes the data to the disk, and does some other
* calculations. Making this an extremely small size will slow
* the library down, but you may want to experiment to determine
* where it becomes significant, if you are concerned with memory
* usage. Note that zlib allocates at least 32Kb also. For readers,
* this describes the size of the buffer available to read the data in.
* Unless this gets smaller than the size of a row (compressed),
* it should not make much difference how big this is.
*/
# define PNG_ZBUF_SIZE 8192
/* Enable if you want a write-only libpng */
# define PNG_READ_SUPPORTED
/* Enable if you want a read-only libpng */
# define PNG_WRITE_SUPPORTED
/* Enabled by default in 1.2.0. You can disable this if you don't need to
support PNGs that are embedded in MNG datastreams */
#undef PNG_MNG_FEATURES_SUPPORTED
# define PNG_FLOATING_POINT_SUPPORTED
/* If you are running on a machine where you cannot allocate more
* than 64K of memory at once, uncomment this. While libpng will not
* normally need that much memory in a chunk (unless you load up a very
* large file), zlib needs to know how big of a chunk it can use, and
* libpng thus makes sure to check any memory allocation to verify it
* will fit into memory.
*/
#undef PNG_MAX_MALLOC_64K
/* Special munging to support doing things the 'cygwin' way:
* 'Normal' png-on-win32 defines/defaults:
* PNG_BUILD_DLL -- building dll
* PNG_USE_DLL -- building an application, linking to dll
* (no define) -- building static library, or building an
* application and linking to the static lib
* 'Cygwin' defines/defaults:
* PNG_BUILD_DLL -- (ignored) building the dll
* (no define) -- (ignored) building an application, linking to the dll
* PNG_STATIC -- (ignored) building the static lib, or building an
* application that links to the static lib.
* ALL_STATIC -- (ignored) building various static libs, or building an
* application that links to the static libs.
* Thus,
* a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
* this bit of #ifdefs will define the 'correct' config variables based on
* that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
* unnecessary.
*
* Also, the precedence order is:
* ALL_STATIC (since we can't #undef something outside our namespace)
* PNG_BUILD_DLL
* PNG_STATIC
* (nothing) == PNG_USE_DLL
*
* CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
* of auto-import in binutils, we no longer need to worry about
* __declspec(dllexport) / __declspec(dllimport) and friends. Therefore,
* we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
* to __declspec() stuff. However, we DO need to worry about
* PNG_BUILD_DLL and PNG_STATIC because those change some defaults
* such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
*/
#undef PNG_BUILD_DLL
#undef PNG_USE_DLL
/* This protects us against compilers that run on a windowing system
* and thus don't have or would rather us not use the stdio types:
* stdin, stdout, and stderr. The only one currently used is stderr
* in png_error() and png_warning(). #defining PNG_NO_CONSOLE_IO will
* prevent these from being compiled and used. #defining PNG_NO_STDIO
* will also prevent these, plus will prevent the entire set of stdio
* macros and functions (FILE *, printf, etc.) from being compiled and used,
* unless (PNG_DEBUG > 0) has been #defined.
*
* #define PNG_NO_CONSOLE_IO
* #define PNG_NO_STDIO
*/
#if defined(_WIN32_WCE)
# include <windows.h>
/* Console I/O functions are not supported on WindowsCE */
# define PNG_NO_CONSOLE_IO
# ifdef PNG_DEBUG
# undef PNG_DEBUG
# endif
#endif
#ifdef PNG_BUILD_DLL
# ifndef PNG_CONSOLE_IO_SUPPORTED
# ifndef PNG_NO_CONSOLE_IO
# define PNG_NO_CONSOLE_IO
# endif
# endif
#endif
# ifdef PNG_NO_STDIO
# ifndef PNG_NO_CONSOLE_IO
# define PNG_NO_CONSOLE_IO
# endif
# ifdef PNG_DEBUG
# if (PNG_DEBUG > 0)
# include <stdio.h>
# endif
# endif
# else
# if !defined(_WIN32_WCE)
/* "stdio.h" functions are not supported on WindowsCE */
# include <stdio.h>
# endif
# endif
/* This macro protects us against machines that don't have function
* prototypes (ie K&R style headers). If your compiler does not handle
* function prototypes, define this macro and use the included ansi2knr.
* I've always been able to use _NO_PROTO as the indicator, but you may
* need to drag the empty declaration out in front of here, or change the
* ifdef to suit your own needs.
*/
#ifndef PNGARG
#ifdef OF /* zlib prototype munger */
# define PNGARG(arglist) OF(arglist)
#else
#ifdef _NO_PROTO
# define PNGARG(arglist) ()
# ifndef PNG_TYPECAST_NULL
# define PNG_TYPECAST_NULL
# endif
#else
# define PNGARG(arglist) arglist
#endif /* _NO_PROTO */
#endif /* OF */
#endif /* PNGARG */
/* Try to determine if we are compiling on a Mac. Note that testing for
* just __MWERKS__ is not good enough, because the Codewarrior is now used
* on non-Mac platforms.
*/
#ifndef MACOS
# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
# define MACOS
# endif
#endif
/* enough people need this for various reasons to include it here */
#if !defined(MACOS) && !defined(RISCOS) && !defined(_WIN32_WCE)
# include <sys/types.h>
#endif
#if !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
# define PNG_SETJMP_SUPPORTED
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* This is an attempt to force a single setjmp behaviour on Linux. If
* the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
*/
# ifdef __linux__
# ifdef _BSD_SOURCE
# define PNG_SAVE_BSD_SOURCE
# undef _BSD_SOURCE
# endif
# ifdef _SETJMP_H
__png.h__ already includes setjmp.h;
__dont__ include it again.;
# endif
# endif /* __linux__ */
/* include setjmp.h for error handling */
# include <setjmp.h>
# ifdef __linux__
# ifdef PNG_SAVE_BSD_SOURCE
# define _BSD_SOURCE
# undef PNG_SAVE_BSD_SOURCE
# endif
# endif /* __linux__ */
#endif /* PNG_SETJMP_SUPPORTED */
#ifdef BSD
# include <strings.h>
#else
# include <string.h>
#endif
/* Other defines for things like memory and the like can go here. */
#ifdef PNG_INTERNAL
#include <stdlib.h>
/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
* aren't usually used outside the library (as far as I know), so it is
* debatable if they should be exported at all. In the future, when it is
* possible to have run-time registry of chunk-handling functions, some of
* these will be made available again.
#define PNG_EXTERN extern
*/
#define PNG_EXTERN
/* Other defines specific to compilers can go here. Try to keep
* them inside an appropriate ifdef/endif pair for portability.
*/
#if defined(PNG_FLOATING_POINT_SUPPORTED)
# if defined(MACOS)
/* We need to check that <math.h> hasn't already been included earlier
* as it seems it doesn't agree with <fp.h>, yet we should really use
* <fp.h> if possible.
*/
# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
# include <fp.h>
# endif
# else
# include <math.h>
# endif
# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
/* Amiga SAS/C: We must include builtin FPU functions when compiling using
* MATH=68881
*/
# include <m68881.h>
# endif
#endif
/* Codewarrior on NT has linking problems without this. */
#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
# define PNG_ALWAYS_EXTERN
#endif
/* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
* stdlib.h like it should (I think). Or perhaps this is a C++
* "feature"?
*/
#ifdef __TURBOC__
# include <mem.h>
# include "alloc.h"
#endif
#if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
# include <malloc.h>
#endif
/* This controls how fine the dithering gets. As this allocates
* a largish chunk of memory (32K), those who are not as concerned
* with dithering quality can decrease some or all of these.
*/
#ifndef PNG_DITHER_RED_BITS
# define PNG_DITHER_RED_BITS 5
#endif
#ifndef PNG_DITHER_GREEN_BITS
# define PNG_DITHER_GREEN_BITS 5
#endif
#ifndef PNG_DITHER_BLUE_BITS
# define PNG_DITHER_BLUE_BITS 5
#endif
/* This controls how fine the gamma correction becomes when you
* are only interested in 8 bits anyway. Increasing this value
* results in more memory being used, and more pow() functions
* being called to fill in the gamma tables. Don't set this value
* less then 8, and even that may not work (I haven't tested it).
*/
#ifndef PNG_MAX_GAMMA_8
# define PNG_MAX_GAMMA_8 11
#endif
/* This controls how much a difference in gamma we can tolerate before
* we actually start doing gamma conversion.
*/
#ifndef PNG_GAMMA_THRESHOLD
# define PNG_GAMMA_THRESHOLD 0.05
#endif
#endif /* PNG_INTERNAL */
/* The following uses const char * instead of char * for error
* and warning message functions, so some compilers won't complain.
* If you do not want to use const, define PNG_NO_CONST here.
*/
#ifndef PNG_NO_CONST
# define PNG_CONST const
#else
# define PNG_CONST
#endif
/* The following defines give you the ability to remove code from the
* library that you will not be using. I wish I could figure out how to
* automate this, but I can't do that without making it seriously hard
* on the users. So if you are not using an ability, change the #define
* to and #undef, and that part of the library will not be compiled. If
* your linker can't find a function, you may want to make sure the
* ability is defined here. Some of these depend upon some others being
* defined. I haven't figured out all the interactions here, so you may
* have to experiment awhile to get everything to compile. If you are
* creating or using a shared library, you probably shouldn't touch this,
* as it will affect the size of the structures, and this will cause bad
* things to happen if the library and/or application ever change.
*/
/* Any features you will not be using can be undef'ed here */
/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
* to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
* on the compile line, then pick and choose which ones to define without
* having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
* if you only want to have a png-compliant reader/writer but don't need
* any of the extra transformations. This saves about 80 kbytes in a
* typical installation of the library. (PNG_NO_* form added in version
* 1.0.1c, for consistency)
*/
/* The size of the png_text structure changed in libpng-1.0.6 when
* iTXt is supported. It is turned off by default, to support old apps
* that malloc the png_text structure instead of calling png_set_text()
* and letting libpng malloc it. It will be turned on by default in
* libpng-1.3.0.
*/
#ifndef PNG_iTXt_SUPPORTED
# if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
# define PNG_NO_READ_iTXt
# endif
# if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
# define PNG_NO_WRITE_iTXt
# endif
#endif
/* The following support, added after version 1.0.0, can be turned off here en
* masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
* with old applications that require the length of png_struct and png_info
* to remain unchanged.
*/
#ifdef PNG_LEGACY_SUPPORTED
# define PNG_NO_FREE_ME
# define PNG_NO_READ_UNKNOWN_CHUNKS
# define PNG_NO_WRITE_UNKNOWN_CHUNKS
# define PNG_NO_READ_USER_CHUNKS
# define PNG_NO_READ_iCCP
# define PNG_NO_WRITE_iCCP
# define PNG_NO_READ_iTXt
# define PNG_NO_WRITE_iTXt
# define PNG_NO_READ_sCAL
# define PNG_NO_WRITE_sCAL
# define PNG_NO_READ_sPLT
# define PNG_NO_WRITE_sPLT
# define PNG_NO_INFO_IMAGE
# define PNG_NO_READ_RGB_TO_GRAY
# define PNG_NO_READ_USER_TRANSFORM
# define PNG_NO_WRITE_USER_TRANSFORM
# define PNG_NO_USER_MEM
# define PNG_NO_READ_EMPTY_PLTE
# define PNG_NO_MNG_FEATURES
# define PNG_NO_FIXED_POINT_SUPPORTED
#endif
/* Ignore attempt to turn off both floating and fixed point support */
#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
!defined(PNG_NO_FIXED_POINT_SUPPORTED)
# define PNG_FIXED_POINT_SUPPORTED
#endif
#ifndef PNG_NO_FREE_ME
# define PNG_FREE_ME_SUPPORTED
#endif
#if defined(PNG_READ_SUPPORTED)
#undef PNG_READ_TRANSFORMS_SUPPORTED
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
# ifndef PNG_NO_READ_EXPAND
# define PNG_READ_EXPAND_SUPPORTED
# endif
# ifndef PNG_NO_READ_SHIFT
# define PNG_READ_SHIFT_SUPPORTED
# endif
# ifndef PNG_NO_READ_PACK
# define PNG_READ_PACK_SUPPORTED
# endif
# ifndef PNG_NO_READ_BGR
# define PNG_READ_BGR_SUPPORTED
# endif
# ifndef PNG_NO_READ_SWAP
# define PNG_READ_SWAP_SUPPORTED
# endif
# ifndef PNG_NO_READ_PACKSWAP
# define PNG_READ_PACKSWAP_SUPPORTED
# endif
# ifndef PNG_NO_READ_INVERT
# define PNG_READ_INVERT_SUPPORTED
# endif
# ifndef PNG_NO_READ_DITHER
# define PNG_READ_DITHER_SUPPORTED
# endif
# ifndef PNG_NO_READ_BACKGROUND
# define PNG_READ_BACKGROUND_SUPPORTED
# endif
# ifndef PNG_NO_READ_16_TO_8
# define PNG_READ_16_TO_8_SUPPORTED
# endif
# ifndef PNG_NO_READ_FILLER
# define PNG_READ_FILLER_SUPPORTED
# endif
# ifndef PNG_NO_READ_GAMMA
# define PNG_READ_GAMMA_SUPPORTED
# endif
# ifndef PNG_NO_READ_GRAY_TO_RGB
# define PNG_READ_GRAY_TO_RGB_SUPPORTED
# endif
# ifndef PNG_NO_READ_SWAP_ALPHA
# define PNG_READ_SWAP_ALPHA_SUPPORTED
# endif
# ifndef PNG_NO_READ_INVERT_ALPHA
# define PNG_READ_INVERT_ALPHA_SUPPORTED
# endif
# ifndef PNG_NO_READ_STRIP_ALPHA
# define PNG_READ_STRIP_ALPHA_SUPPORTED
# endif
# ifndef PNG_NO_READ_USER_TRANSFORM
# define PNG_READ_USER_TRANSFORM_SUPPORTED
# endif
# ifndef PNG_NO_READ_RGB_TO_GRAY
# define PNG_READ_RGB_TO_GRAY_SUPPORTED
# endif
#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
#if !defined(PNG_NO_PROGRESSIVE_READ) && \
!defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive */
# define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */
#endif /* about interlacing capability! You'll */
/* still have interlacing unless you change the following line: */
#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
#ifndef PNG_NO_READ_COMPOSITE_NODIV
# ifndef PNG_NO_READ_COMPOSITED_NODIV /* libpng-1.0.x misspelling */
# define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel, SGI */
# endif
#endif
/* Deprecated, will be removed from version 2.0.0.
Use PNG_MNG_FEATURES_SUPPORTED instead. */
#ifndef PNG_NO_READ_EMPTY_PLTE
# define PNG_READ_EMPTY_PLTE_SUPPORTED
#endif
#endif /* PNG_READ_SUPPORTED */
#if defined(PNG_WRITE_SUPPORTED)
#undef PNG_WRITE_TRANSFORMS_SUPPORTED
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
# ifndef PNG_NO_WRITE_SHIFT
# define PNG_WRITE_SHIFT_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_PACK
# define PNG_WRITE_PACK_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_BGR
# define PNG_WRITE_BGR_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_SWAP
# define PNG_WRITE_SWAP_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_PACKSWAP
# define PNG_WRITE_PACKSWAP_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_INVERT
# define PNG_WRITE_INVERT_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_FILLER
# define PNG_WRITE_FILLER_SUPPORTED /* same as WRITE_STRIP_ALPHA */
# endif
# ifndef PNG_NO_WRITE_SWAP_ALPHA
# define PNG_WRITE_SWAP_ALPHA_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_INVERT_ALPHA
# define PNG_WRITE_INVERT_ALPHA_SUPPORTED
# endif
# ifndef PNG_NO_WRITE_USER_TRANSFORM
# define PNG_WRITE_USER_TRANSFORM_SUPPORTED
# endif
#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
# ifndef PNG_NO_USER_TRANSFORM_PTR
# define PNG_USER_TRANSFORM_PTR_SUPPORTED
# endif
#endif
#undef PNG_WRITE_INTERLACING_SUPPORTED /* not required for PNG-compliant
encoders, but can cause trouble
if left undefined */
#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
defined(PNG_FLOATING_POINT_SUPPORTED)
# define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#endif
#ifndef PNG_1_0_X
#ifndef PNG_NO_ERROR_NUMBERS
#define PNG_ERROR_NUMBERS_SUPPORTED
#endif
#endif /* PNG_1_0_X */
#undef PNG_WRITE_FLUSH_SUPPORTED
/* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
#ifndef PNG_NO_WRITE_EMPTY_PLTE
# define PNG_WRITE_EMPTY_PLTE_SUPPORTED
#endif
#endif /* PNG_WRITE_SUPPORTED */
#ifndef PNG_NO_STDIO
# define PNG_TIME_RFC1123_SUPPORTED
#endif
/* This adds extra functions in pngget.c for accessing data from the
* info pointer (added in version 0.99)
* png_get_image_width()
* png_get_image_height()
* png_get_bit_depth()
* png_get_color_type()
* png_get_compression_type()
* png_get_filter_type()
* png_get_interlace_type()
* png_get_pixel_aspect_ratio()
* png_get_pixels_per_meter()
* png_get_x_offset_pixels()
* png_get_y_offset_pixels()
* png_get_x_offset_microns()
* png_get_y_offset_microns()
*/
#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
# define PNG_EASY_ACCESS_SUPPORTED
#endif
/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
even when PNG_USE_PNGVCRD or PNG_USE_PNGGCCRD is not defined */
#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
# ifndef PNG_ASSEMBLER_CODE_SUPPORTED
# define PNG_ASSEMBLER_CODE_SUPPORTED
# endif
# if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
# define PNG_MMX_CODE_SUPPORTED
# endif
#endif
/* If you are sure that you don't need thread safety and you are compiling
with PNG_USE_PNGCCRD for an MMX application, you can define this for
faster execution. See pnggccrd.c.
#define PNG_THREAD_UNSAFE_OK
*/
#undef PNG_USER_MEM_SUPPORTED
/* These are currently experimental features, define them if you want */
/* very little testing */
/*
#ifdef PNG_READ_SUPPORTED
# ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
# define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
# endif
#endif
*/
/* This is only for PowerPC big-endian and 680x0 systems */
/* some testing */
/*
#ifdef PNG_READ_SUPPORTED
# ifndef PNG_PNG_READ_BIG_ENDIAN_SUPPORTED
# define PNG_READ_BIG_ENDIAN_SUPPORTED
# endif
#endif
*/
/* Buggy compilers (e.g., gcc 2.7.2.2) need this */
/*
#define PNG_NO_POINTER_INDEXING
*/
/* These functions are turned off by default, as they will be phased out. */
/*
#define PNG_USELESS_TESTS_SUPPORTED
#define PNG_CORRECT_PALETTE_SUPPORTED
*/
/* Any chunks you are not interested in, you can undef here. The
* ones that allocate memory may be expecially important (hIST,
* tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info
* a bit smaller.
*/
#undef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#undef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#ifdef PNG_NO_READ_TEXT
# define PNG_NO_READ_iTXt
# define PNG_NO_READ_tEXt
# define PNG_NO_READ_zTXt
#endif
#ifndef PNG_NO_READ_bKGD
# define PNG_READ_bKGD_SUPPORTED
# define PNG_bKGD_SUPPORTED
#endif
#ifndef PNG_NO_READ_cHRM
# define PNG_READ_cHRM_SUPPORTED
# define PNG_cHRM_SUPPORTED
#endif
#ifndef PNG_NO_READ_gAMA
# define PNG_READ_gAMA_SUPPORTED
# define PNG_gAMA_SUPPORTED
#endif
#ifndef PNG_NO_READ_hIST
# define PNG_READ_hIST_SUPPORTED
# define PNG_hIST_SUPPORTED
#endif
#ifndef PNG_NO_READ_iCCP
# define PNG_READ_iCCP_SUPPORTED
# define PNG_iCCP_SUPPORTED
#endif
#ifndef PNG_NO_READ_iTXt
# ifndef PNG_READ_iTXt_SUPPORTED
# define PNG_READ_iTXt_SUPPORTED
# endif
# ifndef PNG_iTXt_SUPPORTED
# define PNG_iTXt_SUPPORTED
# endif
#endif
#ifndef PNG_NO_READ_oFFs
# define PNG_READ_oFFs_SUPPORTED
# define PNG_oFFs_SUPPORTED
#endif
#ifndef PNG_NO_READ_pCAL
# define PNG_READ_pCAL_SUPPORTED
# define PNG_pCAL_SUPPORTED
#endif
#ifndef PNG_NO_READ_sCAL
# define PNG_READ_sCAL_SUPPORTED
# define PNG_sCAL_SUPPORTED
#endif
#ifndef PNG_NO_READ_pHYs
# define PNG_READ_pHYs_SUPPORTED
# define PNG_pHYs_SUPPORTED
#endif
#ifndef PNG_NO_READ_sBIT
# define PNG_READ_sBIT_SUPPORTED
# define PNG_sBIT_SUPPORTED
#endif
#ifndef PNG_NO_READ_sPLT
# define PNG_READ_sPLT_SUPPORTED
# define PNG_sPLT_SUPPORTED
#endif
#ifndef PNG_NO_READ_sRGB
# define PNG_READ_sRGB_SUPPORTED
# define PNG_sRGB_SUPPORTED
#endif
#ifndef PNG_NO_READ_tEXt
# define PNG_READ_tEXt_SUPPORTED
# define PNG_tEXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_tIME
# define PNG_READ_tIME_SUPPORTED
# define PNG_tIME_SUPPORTED
#endif
#ifndef PNG_NO_READ_tRNS
# define PNG_READ_tRNS_SUPPORTED
# define PNG_tRNS_SUPPORTED
#endif
#ifndef PNG_NO_READ_zTXt
# define PNG_READ_zTXt_SUPPORTED
# define PNG_zTXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
# define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
# define PNG_UNKNOWN_CHUNKS_SUPPORTED
# endif
# ifndef PNG_NO_HANDLE_AS_UNKNOWN
# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# endif
#endif
#if !defined(PNG_NO_READ_USER_CHUNKS) && \
defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
# define PNG_READ_USER_CHUNKS_SUPPORTED
# define PNG_USER_CHUNKS_SUPPORTED
# ifdef PNG_NO_READ_UNKNOWN_CHUNKS
# undef PNG_NO_READ_UNKNOWN_CHUNKS
# endif
# ifdef PNG_NO_HANDLE_AS_UNKNOWN
# undef PNG_NO_HANDLE_AS_UNKNOWN
# endif
#endif
#ifndef PNG_NO_READ_OPT_PLTE
# define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
#endif /* optional PLTE chunk in RGB and RGBA images */
#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
defined(PNG_READ_zTXt_SUPPORTED)
# define PNG_READ_TEXT_SUPPORTED
# define PNG_TEXT_SUPPORTED
#endif
#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#ifdef PNG_NO_WRITE_TEXT
# define PNG_NO_WRITE_iTXt
# define PNG_NO_WRITE_tEXt
# define PNG_NO_WRITE_zTXt
#endif
#ifndef PNG_NO_WRITE_bKGD
# define PNG_WRITE_bKGD_SUPPORTED
# ifndef PNG_bKGD_SUPPORTED
# define PNG_bKGD_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_cHRM
# define PNG_WRITE_cHRM_SUPPORTED
# ifndef PNG_cHRM_SUPPORTED
# define PNG_cHRM_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_gAMA
# define PNG_WRITE_gAMA_SUPPORTED
# ifndef PNG_gAMA_SUPPORTED
# define PNG_gAMA_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_hIST
# define PNG_WRITE_hIST_SUPPORTED
# ifndef PNG_hIST_SUPPORTED
# define PNG_hIST_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_iCCP
# define PNG_WRITE_iCCP_SUPPORTED
# ifndef PNG_iCCP_SUPPORTED
# define PNG_iCCP_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_iTXt
# ifndef PNG_WRITE_iTXt_SUPPORTED
# define PNG_WRITE_iTXt_SUPPORTED
# endif
# ifndef PNG_iTXt_SUPPORTED
# define PNG_iTXt_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_oFFs
# define PNG_WRITE_oFFs_SUPPORTED
# ifndef PNG_oFFs_SUPPORTED
# define PNG_oFFs_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_pCAL
# define PNG_WRITE_pCAL_SUPPORTED
# ifndef PNG_pCAL_SUPPORTED
# define PNG_pCAL_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_sCAL
# define PNG_WRITE_sCAL_SUPPORTED
# ifndef PNG_sCAL_SUPPORTED
# define PNG_sCAL_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_pHYs
# define PNG_WRITE_pHYs_SUPPORTED
# ifndef PNG_pHYs_SUPPORTED
# define PNG_pHYs_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_sBIT
# define PNG_WRITE_sBIT_SUPPORTED
# ifndef PNG_sBIT_SUPPORTED
# define PNG_sBIT_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_sPLT
# define PNG_WRITE_sPLT_SUPPORTED
# ifndef PNG_sPLT_SUPPORTED
# define PNG_sPLT_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_sRGB
# define PNG_WRITE_sRGB_SUPPORTED
# ifndef PNG_sRGB_SUPPORTED
# define PNG_sRGB_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_tEXt
# define PNG_WRITE_tEXt_SUPPORTED
# ifndef PNG_tEXt_SUPPORTED
# define PNG_tEXt_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_tIME
# define PNG_WRITE_tIME_SUPPORTED
# ifndef PNG_tIME_SUPPORTED
# define PNG_tIME_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_tRNS
# define PNG_WRITE_tRNS_SUPPORTED
# ifndef PNG_tRNS_SUPPORTED
# define PNG_tRNS_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_zTXt
# define PNG_WRITE_zTXt_SUPPORTED
# ifndef PNG_zTXt_SUPPORTED
# define PNG_zTXt_SUPPORTED
# endif
#endif
#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
# define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
# define PNG_UNKNOWN_CHUNKS_SUPPORTED
# endif
# ifndef PNG_NO_HANDLE_AS_UNKNOWN
# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# endif
# endif
#endif
#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
defined(PNG_WRITE_zTXt_SUPPORTED)
# define PNG_WRITE_TEXT_SUPPORTED
# ifndef PNG_TEXT_SUPPORTED
# define PNG_TEXT_SUPPORTED
# endif
#endif
#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
/* Turn this off to disable png_read_png() and
* png_write_png() and leave the row_pointers member
* out of the info structure.
*/
#ifndef PNG_NO_INFO_IMAGE
# define PNG_INFO_IMAGE_SUPPORTED
#endif
/* need the time information for reading tIME chunks */
#if defined(PNG_tIME_SUPPORTED)
# if !defined(_WIN32_WCE)
/* "time.h" functions are not supported on WindowsCE */
# include <time.h>
# endif
#endif
/* Some typedefs to get us started. These should be safe on most of the
* common platforms. The typedefs should be at least as large as the
* numbers suggest (a png_uint_32 must be at least 32 bits long), but they
* don't have to be exactly that size. Some compilers dislike passing
* unsigned shorts as function parameters, so you may be better off using
* unsigned int for png_uint_16. Likewise, for 64-bit systems, you may
* want to have unsigned int for png_uint_32 instead of unsigned long.
*/
typedef unsigned long png_uint_32;
typedef long png_int_32;
typedef unsigned short png_uint_16;
typedef short png_int_16;
typedef unsigned char png_byte;
/* This is usually size_t. It is typedef'ed just in case you need it to
change (I'm not sure if you will or not, so I thought I'd be safe) */
typedef size_t png_size_t;
/* The following is needed for medium model support. It cannot be in the
* PNG_INTERNAL section. Needs modification for other compilers besides
* MSC. Model independent support declares all arrays and pointers to be
* large using the far keyword. The zlib version used must also support
* model independent data. As of version zlib 1.0.4, the necessary changes
* have been made in zlib. The USE_FAR_KEYWORD define triggers other
* changes that are needed. (Tim Wegner)
*/
/* Separate compiler dependencies (problem here is that zlib.h always
defines FAR. (SJT) */
#ifdef __BORLANDC__
# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
# define LDATA 1
# else
# define LDATA 0
# endif
/* GRR: why is Cygwin in here? Cygwin is not Borland C... */
# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
# define PNG_MAX_MALLOC_64K
# if (LDATA != 1)
# ifndef FAR
# define FAR __far
# endif
# define USE_FAR_KEYWORD
# endif /* LDATA != 1 */
/* Possibly useful for moving data out of default segment.
* Uncomment it if you want. Could also define FARDATA as
* const if your compiler supports it. (SJT)
# define FARDATA FAR
*/
# endif /* __WIN32__, __FLAT__, __CYGWIN__ */
#endif /* __BORLANDC__ */
/* Suggest testing for specific compiler first before testing for
* FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM,
* making reliance oncertain keywords suspect. (SJT)
*/
/* MSC Medium model */
#if defined(FAR)
# if defined(M_I86MM)
# define USE_FAR_KEYWORD
# define FARDATA FAR
# include <dos.h>
# endif
#endif
/* SJT: default case */
#ifndef FAR
# define FAR
#endif
/* At this point FAR is always defined */
#ifndef FARDATA
# define FARDATA
#endif
/* Typedef for floating-point numbers that are converted
to fixed-point with a multiple of 100,000, e.g., int_gamma */
typedef png_int_32 png_fixed_point;
/* Add typedefs for pointers */
typedef void FAR * png_voidp;
typedef png_byte FAR * png_bytep;
typedef png_uint_32 FAR * png_uint_32p;
typedef png_int_32 FAR * png_int_32p;
typedef png_uint_16 FAR * png_uint_16p;
typedef png_int_16 FAR * png_int_16p;
typedef PNG_CONST char FAR * png_const_charp;
typedef char FAR * png_charp;
typedef png_fixed_point FAR * png_fixed_point_p;
#ifndef PNG_NO_STDIO
#if defined(_WIN32_WCE)
typedef HANDLE png_FILE_p;
#else
typedef FILE * png_FILE_p;
#endif
#endif
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR * png_doublep;
#endif
/* Pointers to pointers; i.e. arrays */
typedef png_byte FAR * FAR * png_bytepp;
typedef png_uint_32 FAR * FAR * png_uint_32pp;
typedef png_int_32 FAR * FAR * png_int_32pp;
typedef png_uint_16 FAR * FAR * png_uint_16pp;
typedef png_int_16 FAR * FAR * png_int_16pp;
typedef PNG_CONST char FAR * FAR * png_const_charpp;
typedef char FAR * FAR * png_charpp;
typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR * FAR * png_doublepp;
#endif
/* Pointers to pointers to pointers; i.e., pointer to array */
typedef char FAR * FAR * FAR * png_charppp;
/* libpng typedefs for types in zlib. If zlib changes
* or another compression library is used, then change these.
* Eliminates need to change all the source files.
*/
typedef charf * png_zcharp;
typedef charf * FAR * png_zcharpp;
typedef z_stream FAR * png_zstreamp;
/*
* Define PNG_BUILD_DLL if the module being built is a Windows
* LIBPNG DLL.
*
* Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
* It is equivalent to Microsoft predefined macro _DLL that is
* automatically defined when you compile using the share
* version of the CRT (C Run-Time library)
*
* The cygwin mods make this behavior a little different:
* Define PNG_BUILD_DLL if you are building a dll for use with cygwin
* Define PNG_STATIC if you are building a static library for use with cygwin,
* -or- if you are building an application that you want to link to the
* static library.
* PNG_USE_DLL is defined by default (no user action needed) unless one of
* the other flags is defined.
*/
#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
# define PNG_DLL
#endif
/* If CYGWIN, then disallow GLOBAL ARRAYS unless building a static lib.
* When building a static lib, default to no GLOBAL ARRAYS, but allow
* command-line override
*/
#if defined(__CYGWIN__)
# if !defined(PNG_STATIC)
# if defined(PNG_USE_GLOBAL_ARRAYS)
# undef PNG_USE_GLOBAL_ARRAYS
# endif
# if !defined(PNG_USE_LOCAL_ARRAYS)
# define PNG_USE_LOCAL_ARRAYS
# endif
# else
# if defined(PNG_USE_LOCAL_ARRAYS) || defined(PNG_NO_GLOBAL_ARRAYS)
# if defined(PNG_USE_GLOBAL_ARRAYS)
# undef PNG_USE_GLOBAL_ARRAYS
# endif
# endif
# endif
# if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
# define PNG_USE_LOCAL_ARRAYS
# endif
#endif
/* Do not use global arrays (helps with building DLL's)
* They are no longer used in libpng itself, since version 1.0.5c,
* but might be required for some pre-1.0.5c applications.
*/
#if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
# if defined(PNG_NO_GLOBAL_ARRAYS) || (defined(__GNUC__) && defined(PNG_DLL))
# define PNG_USE_LOCAL_ARRAYS
# else
# define PNG_USE_GLOBAL_ARRAYS
# endif
#endif
#if defined(__CYGWIN__)
# undef PNGAPI
# define PNGAPI __cdecl
# undef PNG_IMPEXP
# define PNG_IMPEXP
#endif
/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
* you may get warnings regarding the linkage of png_zalloc and png_zfree.
* Don't ignore those warnings; you must also reset the default calling
* convention in your compiler to match your PNGAPI, and you must build
* zlib and your applications the same way you build libpng.
*/
#ifndef PNGAPI
#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
# ifndef PNG_NO_MODULEDEF
# define PNG_NO_MODULEDEF
# endif
#endif
#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
# define PNG_IMPEXP
#endif
#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
(( defined(_Windows) || defined(_WINDOWS) || \
defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))
# if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
# define PNGAPI __cdecl
# else
# define PNGAPI _cdecl
# endif
# if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
# define PNG_IMPEXP
# endif
# if !defined(PNG_IMPEXP)
# define PNG_EXPORT_TYPE1(type,symbol) PNG_IMPEXP type PNGAPI symbol
# define PNG_EXPORT_TYPE2(type,symbol) type PNG_IMPEXP PNGAPI symbol
/* Borland/Microsoft */
# if defined(_MSC_VER) || defined(__BORLANDC__)
# if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
# define PNG_EXPORT PNG_EXPORT_TYPE1
# else
# define PNG_EXPORT PNG_EXPORT_TYPE2
# if defined(PNG_BUILD_DLL)
# define PNG_IMPEXP __export
# else
# define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in
VC++ */
# endif /* Exists in Borland C++ for
C++ classes (== huge) */
# endif
# endif
# if !defined(PNG_IMPEXP)
# if defined(PNG_BUILD_DLL)
# define PNG_IMPEXP __declspec(dllexport)
# else
# define PNG_IMPEXP __declspec(dllimport)
# endif
# endif
# endif /* PNG_IMPEXP */
#else /* !(DLL || non-cygwin WINDOWS) */
# if (defined(__IBMC__) || defined(IBMCPP__)) && defined(__OS2__)
# define PNGAPI _System
# define PNG_IMPEXP
# else
# if 0 /* ... other platforms, with other meanings */
# else
# define PNGAPI
# define PNG_IMPEXP
# endif
# endif
#endif
#endif
#ifndef PNGAPI
# define PNGAPI
#endif
#ifndef PNG_IMPEXP
# define PNG_IMPEXP
#endif
#ifndef PNG_EXPORT
# define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
#endif
#ifdef PNG_USE_GLOBAL_ARRAYS
# ifndef PNG_EXPORT_VAR
# define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
# endif
#endif
/* User may want to use these so they are not in PNG_INTERNAL. Any library
* functions that are passed far data must be model independent.
*/
#ifndef PNG_ABORT
# define PNG_ABORT() abort()
#endif
#ifdef PNG_SETJMP_SUPPORTED
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#else
# define png_jmpbuf(png_ptr) \
(LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
#endif
#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
/* use this to make far-to-near assignments */
# define CHECK 1
# define NOCHECK 0
# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
# define png_strcpy _fstrcpy
# define png_strlen _fstrlen
# define png_memcmp _fmemcmp /* SJT: added */
# define png_memcpy _fmemcpy
# define png_memset _fmemset
#else /* use the usual functions */
# define CVT_PTR(ptr) (ptr)
# define CVT_PTR_NOCHECK(ptr) (ptr)
# define png_strcpy strcpy
# define png_strlen strlen
# define png_memcmp memcmp /* SJT: added */
# define png_memcpy memcpy
# define png_memset memset
#endif
/* End of memory model independent support */
/* Just a little check that someone hasn't tried to define something
* contradictory.
*/
#if (PNG_ZBUF_SIZE > 65536) && defined(PNG_MAX_MALLOC_64K)
# undef PNG_ZBUF_SIZE
# define PNG_ZBUF_SIZE 65536
#endif
#ifdef PNG_READ_SUPPORTED
/* Prior to libpng-1.0.9, this block was in pngasmrd.h */
#if defined(PNG_INTERNAL)
/* These are the default thresholds before the MMX code kicks in; if either
* rowbytes or bitdepth is below the threshold, plain C code is used. These
* can be overridden at runtime via the png_set_mmx_thresholds() call in
* libpng 1.2.0 and later. The values below were chosen by Intel.
*/
#ifndef PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT
# define PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT 128 /* >= */
#endif
#ifndef PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT
# define PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT 9 /* >= */
#endif
/* Set this in the makefile for VC++ on Pentium, not here. */
/* Platform must be Pentium. Makefile must assemble and load pngvcrd.c .
* MMX will be detected at run time and used if present.
*/
#ifdef PNG_USE_PNGVCRD
# define PNG_HAVE_ASSEMBLER_COMBINE_ROW
# define PNG_HAVE_ASSEMBLER_READ_INTERLACE
# define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
#endif
/* Set this in the makefile for gcc/as on Pentium, not here. */
/* Platform must be Pentium. Makefile must assemble and load pnggccrd.c .
* MMX will be detected at run time and used if present.
*/
#ifdef PNG_USE_PNGGCCRD
# define PNG_HAVE_ASSEMBLER_COMBINE_ROW
# define PNG_HAVE_ASSEMBLER_READ_INTERLACE
# define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
#endif
/* - see pnggccrd.c for info about what is currently enabled */
#endif /* PNG_INTERNAL */
#endif /* PNG_READ_SUPPORTED */
#endif /* PNGCONF_H */
libavformat/libpng/pngread.c deleted 100644 → 0
View file @ 496b6ff2
/* pngread.c - read a PNG file
*
* libpng 1.0.15 - October 3, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file contains routines that an application calls directly to
* read a PNG file or stream.
*/
#define PNG_INTERNAL
#include "png.h"
void png_read_init(png_struct *png_ptr)
{
/* reset all variables to 0 */
memset(png_ptr, 0, sizeof (png_struct));
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
switch (inflateInit(&png_ptr->zstream))
{
case Z_OK: /* Do nothing */ break;
case Z_MEM_ERROR:
case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
default: png_error(png_ptr, "Unknown zlib error");
}
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
}
/* Read the information before the actual image data. This has been
* changed in v0.90 to allow reading a file that already has the magic
* bytes read from the stream. You can tell libpng how many bytes have
* been read from the beginning of the stream (up to the maximum of 8)
* via png_set_sig_bytes(), and we will only check the remaining bytes
* here. The application can then have access to the signature bytes we
* read if it is determined that this isn't a valid PNG file.
*/
void PNGAPI
png_read_info(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_info\n");
/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
{
png_size_t num_checked = png_ptr->sig_bytes,
num_to_check = 8 - num_checked;
png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
png_ptr->sig_bytes = 8;
if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
{
if (num_checked < 4 &&
png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
png_error(png_ptr, "Not a PNG file");
else
png_error(png_ptr, "PNG file corrupted by ASCII conversion");
}
if (num_checked < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
for(;;)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IHDR;
PNG_IDAT;
PNG_IEND;
PNG_PLTE;
#if defined(PNG_READ_bKGD_SUPPORTED)
PNG_bKGD;
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
PNG_cHRM;
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
PNG_gAMA;
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
PNG_hIST;
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
PNG_iCCP;
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
PNG_iTXt;
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
PNG_oFFs;
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
PNG_pCAL;
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
PNG_pHYs;
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_sBIT;
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_sCAL;
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
PNG_sPLT;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
PNG_sRGB;
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
PNG_tEXt;
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
PNG_tIME;
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
PNG_tRNS;
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
PNG_zTXt;
#endif
#endif /* PNG_GLOBAL_ARRAYS */
png_byte chunk_length[4];
png_uint_32 length;
png_read_data(png_ptr, chunk_length, 4);
length = png_get_uint_32(chunk_length);
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
length);
if (length > PNG_MAX_UINT)
png_error(png_ptr, "Invalid chunk length.");
/* This should be a binary subdivision search or a hash for
* matching the chunk name rather than a linear search.
*/
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
{
if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_ptr->mode |= PNG_HAVE_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
break;
}
}
#endif
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
png_ptr->idat_size = length;
png_ptr->mode |= PNG_HAVE_IDAT;
break;
}
#if defined(PNG_READ_bKGD_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
png_handle_hIST(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
png_handle_oFFs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
png_handle_sBIT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
png_handle_tIME(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
}
}
/* Initialize palette, background, etc, after transformations
* are set, but before any reading takes place. This allows
* the user to obtain a gamma-corrected palette, for example.
* If the user doesn't call this, we will do it ourselves.
*/
void PNGAPI
png_start_read_image(png_structp png_ptr)
{
png_debug(1, "in png_start_read_image\n");
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
}
void PNGAPI
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
#endif
int ret;
png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
png_ptr->row_number, png_ptr->pass);
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
/* check for transforms that have been set but were defined out */
#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & PNG_FILLER)
png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK)
png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
if (png_ptr->transformations & PNG_BGR)
png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
#endif
}
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* if interlaced and we do not need a new row, combine row and return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
{
case 0:
if (png_ptr->row_number & 0x07)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 1:
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 2:
if ((png_ptr->row_number & 0x07) != 4)
{
if (dsp_row != NULL && (png_ptr->row_number & 4))
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 3:
if ((png_ptr->row_number & 3) || png_ptr->width < 3)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 4:
if ((png_ptr->row_number & 3) != 2)
{
if (dsp_row != NULL && (png_ptr->row_number & 2))
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 5:
if ((png_ptr->row_number & 1) || png_ptr->width < 2)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 6:
if (!(png_ptr->row_number & 1))
{
png_read_finish_row(png_ptr);
return;
}
break;
}
}
#endif
if (!(png_ptr->mode & PNG_HAVE_IDAT))
png_error(png_ptr, "Invalid attempt to read row data");
png_ptr->zstream.next_out = png_ptr->row_buf;
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
do
{
if (!(png_ptr->zstream.avail_in))
{
while (!png_ptr->idat_size)
{
png_byte chunk_length[4];
png_crc_finish(png_ptr, 0);
png_read_data(png_ptr, chunk_length, 4);
png_ptr->idat_size = png_get_uint_32(chunk_length);
if (png_ptr->idat_size > PNG_MAX_UINT)
png_error(png_ptr, "Invalid chunk length.");
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
}
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_in = png_ptr->zbuf;
if (png_ptr->zbuf_size > png_ptr->idat_size)
png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
png_crc_read(png_ptr, png_ptr->zbuf,
(png_size_t)png_ptr->zstream.avail_in);
png_ptr->idat_size -= png_ptr->zstream.avail_in;
}
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
if (ret == Z_STREAM_END)
{
if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
png_ptr->idat_size)
png_error(png_ptr, "Extra compressed data");
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
}
if (ret != Z_OK)
png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
"Decompression error");
} while (png_ptr->zstream.avail_out);
png_ptr->row_info.color_type = png_ptr->color_type;
png_ptr->row_info.width = png_ptr->iwidth;
png_ptr->row_info.channels = png_ptr->channels;
png_ptr->row_info.bit_depth = png_ptr->bit_depth;
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
if(png_ptr->row_buf[0])
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
png_ptr->rowbytes + 1);
#if defined(PNG_MNG_FEATURES_SUPPORTED)
if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
/* Intrapixel differencing */
png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
}
#endif
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* blow up interlaced rows to full size */
if (png_ptr->interlaced &&
(png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
/* old interface (pre-1.0.9):
png_do_read_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
*/
png_do_read_interlace(png_ptr);
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
if (row != NULL)
png_combine_row(png_ptr, row,
png_pass_mask[png_ptr->pass]);
}
else
#endif
{
if (row != NULL)
png_combine_row(png_ptr, row, 0xff);
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row, 0xff);
}
png_read_finish_row(png_ptr);
if (png_ptr->read_row_fn != NULL)
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
}
/* Read the end of the PNG file. Will not read past the end of the
* file, will verify the end is accurate, and will read any comments
* or time information at the end of the file, if info is not NULL.
*/
void PNGAPI
png_read_end(png_structp png_ptr, png_infop info_ptr)
{
png_byte chunk_length[4];
png_uint_32 length;
png_debug(1, "in png_read_end\n");
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
do
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IHDR;
PNG_IDAT;
PNG_IEND;
PNG_PLTE;
#if defined(PNG_READ_bKGD_SUPPORTED)
PNG_bKGD;
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
PNG_cHRM;
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
PNG_gAMA;
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
PNG_hIST;
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
PNG_iCCP;
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
PNG_iTXt;
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
PNG_oFFs;
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
PNG_pCAL;
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
PNG_pHYs;
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_sBIT;
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_sCAL;
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
PNG_sPLT;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
PNG_sRGB;
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
PNG_tEXt;
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
PNG_tIME;
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
PNG_tRNS;
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
PNG_zTXt;
#endif
#endif /* PNG_GLOBAL_ARRAYS */
png_read_data(png_ptr, chunk_length, 4);
length = png_get_uint_32(chunk_length);
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
if (length > PNG_MAX_UINT)
png_error(png_ptr, "Invalid chunk length.");
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
{
if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
}
else
png_ptr->mode |= PNG_AFTER_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
}
#endif
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
/* Zero length IDATs are legal after the last IDAT has been
* read, but not after other chunks have been read.
*/
if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
png_crc_finish(png_ptr, length);
}
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
#if defined(PNG_READ_bKGD_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
png_handle_hIST(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
png_handle_oFFs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
png_handle_sBIT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
png_handle_tIME(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
} while (!(png_ptr->mode & PNG_HAVE_IEND));
}
/* free all memory used by the read (old method) */
void /* PRIVATE */
png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp;
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn;
#endif
png_debug(1, "in png_read_destroy\n");
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->big_row_buf);
png_free(png_ptr, png_ptr->prev_row);
#if defined(PNG_READ_DITHER_SUPPORTED)
png_free(png_ptr, png_ptr->palette_lookup);
png_free(png_ptr, png_ptr->dither_index);
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
png_free(png_ptr, png_ptr->gamma_table);
#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
png_free(png_ptr, png_ptr->gamma_from_1);
png_free(png_ptr, png_ptr->gamma_to_1);
#endif
#ifdef PNG_FREE_ME_SUPPORTED
if (png_ptr->free_me & PNG_FREE_PLTE)
png_zfree(png_ptr, png_ptr->palette);
png_ptr->free_me &= ~PNG_FREE_PLTE;
#else
if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
png_zfree(png_ptr, png_ptr->palette);
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
#endif
#if defined(PNG_tRNS_SUPPORTED) || \
defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
#ifdef PNG_FREE_ME_SUPPORTED
if (png_ptr->free_me & PNG_FREE_TRNS)
png_free(png_ptr, png_ptr->trans);
png_ptr->free_me &= ~PNG_FREE_TRNS;
#else
if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
png_free(png_ptr, png_ptr->trans);
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
#endif
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
#ifdef PNG_FREE_ME_SUPPORTED
if (png_ptr->free_me & PNG_FREE_HIST)
png_free(png_ptr, png_ptr->hist);
png_ptr->free_me &= ~PNG_FREE_HIST;
#else
if (png_ptr->flags & PNG_FLAG_FREE_HIST)
png_free(png_ptr, png_ptr->hist);
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
#endif
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
if (png_ptr->gamma_16_table != NULL)
{
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_table[i]);
}
png_free(png_ptr, png_ptr->gamma_16_table);
}
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
if (png_ptr->gamma_16_from_1 != NULL)
{
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
}
png_free(png_ptr, png_ptr->gamma_16_from_1);
}
if (png_ptr->gamma_16_to_1 != NULL)
{
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
}
png_free(png_ptr, png_ptr->gamma_16_to_1);
}
#endif
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
#endif
inflateEnd(&png_ptr->zstream);
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
png_free(png_ptr, png_ptr->save_buffer);
#endif
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
#ifdef PNG_TEXT_SUPPORTED
png_free(png_ptr, png_ptr->current_text);
#endif /* PNG_TEXT_SUPPORTED */
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
/* Save the important info out of the png_struct, in case it is
* being used again.
*/
#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
#endif
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
png_memset(png_ptr, 0, sizeof (png_struct));
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
#endif
}
libavformat/libpng/pngrutil.c deleted 100644 → 0
View file @ 496b6ff2
/* pngrutil.c - utilities to read a PNG file
*
* libpng 1.0.15 - October 3, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file contains routines that are only called from within
* libpng itself during the course of reading an image.
*/
#define PNG_INTERNAL
#include "png.h"
void PNGAPI
png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
png_uint_32 width, png_uint_32 height, int bit_depth,
int color_type, int interlace_type, int compression_type,
int filter_type)
{
int rowbytes_per_pixel;
png_debug1(1, "in %s storage function\n", "IHDR");
if (png_ptr == NULL || info_ptr == NULL)
return;
/* check for width and height valid values */
if (width == 0 || height == 0)
png_error(png_ptr, "Image width or height is zero in IHDR");
if (width > PNG_MAX_UINT || height > PNG_MAX_UINT)
png_error(png_ptr, "Invalid image size in IHDR");
/* check other values */
if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
bit_depth != 8 && bit_depth != 16)
png_error(png_ptr, "Invalid bit depth in IHDR");
if (color_type < 0 || color_type == 1 ||
color_type == 5 || color_type > 6)
png_error(png_ptr, "Invalid color type in IHDR");
if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
((color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
if (interlace_type >= PNG_INTERLACE_LAST)
png_error(png_ptr, "Unknown interlace method in IHDR");
if (compression_type != PNG_COMPRESSION_TYPE_BASE)
png_error(png_ptr, "Unknown compression method in IHDR");
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* Accept filter_method 64 (intrapixel differencing) only if
* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
* 2. Libpng did not read a PNG signature (this filter_method is only
* used in PNG datastreams that are embedded in MNG datastreams) and
* 3. The application called png_permit_mng_features with a mask that
* included PNG_FLAG_MNG_FILTER_64 and
* 4. The filter_method is 64 and
* 5. The color_type is RGB or RGBA
*/
if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
if(filter_type != PNG_FILTER_TYPE_BASE)
{
if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
(color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
png_error(png_ptr, "Unknown filter method in IHDR");
if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
png_warning(png_ptr, "Invalid filter method in IHDR");
}
#else
if(filter_type != PNG_FILTER_TYPE_BASE)
png_error(png_ptr, "Unknown filter method in IHDR");
#endif
info_ptr->width = width;
info_ptr->height = height;
info_ptr->bit_depth = (png_byte)bit_depth;
info_ptr->color_type =(png_byte) color_type;
info_ptr->compression_type = (png_byte)compression_type;
info_ptr->filter_type = (png_byte)filter_type;
info_ptr->interlace_type = (png_byte)interlace_type;
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
info_ptr->channels = 1;
else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
info_ptr->channels = 3;
else
info_ptr->channels = 1;
if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
info_ptr->channels++;
info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
/* check for overflow */
rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
if ( width > PNG_MAX_UINT/rowbytes_per_pixel - 64)
{
png_warning(png_ptr,
"Width too large to process image data; rowbytes will overflow.");
info_ptr->rowbytes = (png_size_t)0;
}
else
info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
}
void PNGAPI
png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
png_colorp palette, int num_palette)
{
png_debug1(1, "in %s storage function\n", "PLTE");
if (png_ptr == NULL || info_ptr == NULL)
return;
/*
* It may not actually be necessary to set png_ptr->palette here;
* we do it for backward compatibility with the way the png_handle_tRNS
* function used to do the allocation.
*/
#ifdef PNG_FREE_ME_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
#endif
/* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
in case of an invalid PNG file that has too-large sample values. */
png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)256,
sizeof (png_color));
if (png_ptr->palette == NULL)
png_error(png_ptr, "Unable to malloc palette");
png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
info_ptr->palette = png_ptr->palette;
info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_PLTE;
#else
png_ptr->flags |= PNG_FLAG_FREE_PLTE;
#endif
info_ptr->valid |= PNG_INFO_PLTE;
}
#if defined(_WIN32_WCE)
/* strtod() function is not supported on WindowsCE */
# ifdef PNG_FLOATING_POINT_SUPPORTED
__inline double strtod(const char *nptr, char **endptr)
{
double result = 0;
int len;
wchar_t *str, *end;
len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
str = (wchar_t *)malloc(len * sizeof(wchar_t));
if ( NULL != str )
{
MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
result = wcstod(str, &end);
len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
*endptr = (char *)nptr + (png_strlen(nptr) - len + 1);
free(str);
}
return result;
}
# endif
#endif
#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
png_uint_32 /* PRIVATE */
png_get_uint_32(png_bytep buf)
{
png_uint_32 i = ((png_uint_32)(*buf) << 24) +
((png_uint_32)(*(buf + 1)) << 16) +
((png_uint_32)(*(buf + 2)) << 8) +
(png_uint_32)(*(buf + 3));
return (i);
}
#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED)
/* Grab a signed 32-bit integer from a buffer in big-endian format. The
* data is stored in the PNG file in two's complement format, and it is
* assumed that the machine format for signed integers is the same. */
png_int_32 /* PRIVATE */
png_get_int_32(png_bytep buf)
{
png_int_32 i = ((png_int_32)(*buf) << 24) +
((png_int_32)(*(buf + 1)) << 16) +
((png_int_32)(*(buf + 2)) << 8) +
(png_int_32)(*(buf + 3));
return (i);
}
#endif /* PNG_READ_pCAL_SUPPORTED */
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
png_uint_16 /* PRIVATE */
png_get_uint_16(png_bytep buf)
{
png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
(png_uint_16)(*(buf + 1)));
return (i);
}
#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
/* Read data, and (optionally) run it through the CRC. */
void /* PRIVATE */
png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
{
png_read_data(png_ptr, buf, length);
png_calculate_crc(png_ptr, buf, length);
}
/* Optionally skip data and then check the CRC. Depending on whether we
are reading a ancillary or critical chunk, and how the program has set
things up, we may calculate the CRC on the data and print a message.
Returns '1' if there was a CRC error, '0' otherwise. */
int /* PRIVATE */
png_crc_finish(png_structp png_ptr, png_uint_32 skip)
{
png_size_t i;
png_size_t istop = png_ptr->zbuf_size;
for (i = (png_size_t)skip; i > istop; i -= istop)
{
png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
}
if (i)
{
png_crc_read(png_ptr, png_ptr->zbuf, i);
}
if (png_crc_error(png_ptr))
{
if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
(!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
(png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
{
png_chunk_warning(png_ptr, "CRC error");
}
else
{
png_chunk_error(png_ptr, "CRC error");
}
return (1);
}
return (0);
}
/* Compare the CRC stored in the PNG file with that calculated by libpng from
the data it has read thus far. */
int /* PRIVATE */
png_crc_error(png_structp png_ptr)
{
png_byte crc_bytes[4];
png_uint_32 crc;
int need_crc = 1;
if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
{
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
need_crc = 0;
}
else /* critical */
{
if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
need_crc = 0;
}
png_read_data(png_ptr, crc_bytes, 4);
if (need_crc)
{
crc = png_get_uint_32(crc_bytes);
return ((int)(crc != png_ptr->crc));
}
else
return (0);
}
#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
defined(PNG_READ_iCCP_SUPPORTED)
/*
* Decompress trailing data in a chunk. The assumption is that chunkdata
* points at an allocated area holding the contents of a chunk with a
* trailing compressed part. What we get back is an allocated area
* holding the original prefix part and an uncompressed version of the
* trailing part (the malloc area passed in is freed).
*/
png_charp /* PRIVATE */
png_decompress_chunk(png_structp png_ptr, int comp_type,
png_charp chunkdata, png_size_t chunklength,
png_size_t prefix_size, png_size_t *newlength)
{
static char msg[] = "Error decoding compressed text";
png_charp text = NULL;
png_size_t text_size;
if (comp_type == PNG_COMPRESSION_TYPE_BASE)
{
int ret = Z_OK;
png_ptr->zstream.next_in = (png_bytep)(chunkdata + prefix_size);
png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
text_size = 0;
text = NULL;
while (png_ptr->zstream.avail_in)
{
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END)
{
if (png_ptr->zstream.msg != NULL)
png_warning(png_ptr, png_ptr->zstream.msg);
else
png_warning(png_ptr, msg);
inflateReset(&png_ptr->zstream);
png_ptr->zstream.avail_in = 0;
if (text == NULL)
{
text_size = prefix_size + sizeof(msg) + 1;
text = (png_charp)png_malloc_warn(png_ptr, text_size);
if (text == NULL)
{
png_free(png_ptr,chunkdata);
png_error(png_ptr,"Not enough memory to decompress chunk");
}
png_memcpy(text, chunkdata, prefix_size);
}
text[text_size - 1] = 0x00;
/* Copy what we can of the error message into the text chunk */
text_size = (png_size_t)(chunklength - (text - chunkdata) - 1);
text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
png_memcpy(text + prefix_size, msg, text_size + 1);
break;
}
if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
{
if (text == NULL)
{
text_size = prefix_size +
png_ptr->zbuf_size - png_ptr->zstream.avail_out;
text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
if (text == NULL)
{
png_free(png_ptr,chunkdata);
png_error(png_ptr,"Not enough memory to decompress chunk.");
}
png_memcpy(text + prefix_size, png_ptr->zbuf,
text_size - prefix_size);
png_memcpy(text, chunkdata, prefix_size);
*(text + text_size) = 0x00;
}
else
{
png_charp tmp;
tmp = text;
text = (png_charp)png_malloc_warn(png_ptr,
(png_uint_32)(text_size +
png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
if (text == NULL)
{
png_free(png_ptr, tmp);
png_free(png_ptr, chunkdata);
png_error(png_ptr,"Not enough memory to decompress chunk..");
}
png_memcpy(text, tmp, text_size);
png_free(png_ptr, tmp);
png_memcpy(text + text_size, png_ptr->zbuf,
(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
*(text + text_size) = 0x00;
}
if (ret == Z_STREAM_END)
break;
else
{
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
}
}
}
if (ret != Z_STREAM_END)
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char umsg[50];
if (ret == Z_BUF_ERROR)
sprintf(umsg,"Buffer error in compressed datastream in %s chunk",
png_ptr->chunk_name);
else if (ret == Z_DATA_ERROR)
sprintf(umsg,"Data error in compressed datastream in %s chunk",
png_ptr->chunk_name);
else
sprintf(umsg,"Incomplete compressed datastream in %s chunk",
png_ptr->chunk_name);
png_warning(png_ptr, umsg);
#else
png_warning(png_ptr,
"Incomplete compressed datastream in chunk other than IDAT");
#endif
text_size=prefix_size;
if (text == NULL)
{
text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
if (text == NULL)
{
png_free(png_ptr, chunkdata);
png_error(png_ptr,"Not enough memory for text.");
}
png_memcpy(text, chunkdata, prefix_size);
}
*(text + text_size) = 0x00;
}
inflateReset(&png_ptr->zstream);
png_ptr->zstream.avail_in = 0;
png_free(png_ptr, chunkdata);
chunkdata = text;
*newlength=text_size;
}
else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char umsg[50];
sprintf(umsg, "Unknown zTXt compression type %d", comp_type);
png_warning(png_ptr, umsg);
#else
png_warning(png_ptr, "Unknown zTXt compression type");
#endif
*(chunkdata + prefix_size) = 0x00;
*newlength=prefix_size;
}
return chunkdata;
}
#endif
/* read and check the IDHR chunk */
void /* PRIVATE */
png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[13];
png_uint_32 width, height;
int bit_depth, color_type, compression_type, filter_type;
int interlace_type;
png_debug(1, "in png_handle_IHDR\n");
if (png_ptr->mode & PNG_HAVE_IHDR)
png_error(png_ptr, "Out of place IHDR");
/* check the length */
if (length != 13)
png_error(png_ptr, "Invalid IHDR chunk");
png_ptr->mode |= PNG_HAVE_IHDR;
png_crc_read(png_ptr, buf, 13);
png_crc_finish(png_ptr, 0);
width = png_get_uint_32(buf);
height = png_get_uint_32(buf + 4);
bit_depth = buf[8];
color_type = buf[9];
compression_type = buf[10];
filter_type = buf[11];
interlace_type = buf[12];
/* set internal variables */
png_ptr->width = width;
png_ptr->height = height;
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->interlaced = (png_byte)interlace_type;
png_ptr->color_type = (png_byte)color_type;
#if defined(PNG_MNG_FEATURES_SUPPORTED)
png_ptr->filter_type = (png_byte)filter_type;
#endif
/* find number of channels */
switch (png_ptr->color_type)
{
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_PALETTE:
png_ptr->channels = 1;
break;
case PNG_COLOR_TYPE_RGB:
png_ptr->channels = 3;
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
png_ptr->channels = 2;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
png_ptr->channels = 4;
break;
}
/* set up other useful info */
png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
png_ptr->channels);
png_ptr->rowbytes = ((png_ptr->width *
(png_uint_32)png_ptr->pixel_depth + 7) >> 3);
png_debug1(3,"bit_depth = %d\n", png_ptr->bit_depth);
png_debug1(3,"channels = %d\n", png_ptr->channels);
png_debug1(3,"rowbytes = %lu\n", png_ptr->rowbytes);
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
color_type, interlace_type, compression_type, filter_type);
}
/* read and check the palette */
void /* PRIVATE */
png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_color palette[PNG_MAX_PALETTE_LENGTH];
int num, i;
#ifndef PNG_NO_POINTER_INDEXING
png_colorp pal_ptr;
#endif
png_debug(1, "in png_handle_PLTE\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before PLTE");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid PLTE after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
png_error(png_ptr, "Duplicate PLTE chunk");
png_ptr->mode |= PNG_HAVE_PLTE;
if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
{
png_warning(png_ptr,
"Ignoring PLTE chunk in grayscale PNG");
png_crc_finish(png_ptr, length);
return;
}
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
png_crc_finish(png_ptr, length);
return;
}
#endif
if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
{
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
png_warning(png_ptr, "Invalid palette chunk");
png_crc_finish(png_ptr, length);
return;
}
else
{
png_error(png_ptr, "Invalid palette chunk");
}
}
num = (int)length / 3;
#ifndef PNG_NO_POINTER_INDEXING
for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
{
png_byte buf[3];
png_crc_read(png_ptr, buf, 3);
pal_ptr->red = buf[0];
pal_ptr->green = buf[1];
pal_ptr->blue = buf[2];
}
#else
for (i = 0; i < num; i++)
{
png_byte buf[3];
png_crc_read(png_ptr, buf, 3);
/* don't depend upon png_color being any order */
palette[i].red = buf[0];
palette[i].green = buf[1];
palette[i].blue = buf[2];
}
#endif
/* If we actually NEED the PLTE chunk (ie for a paletted image), we do
whatever the normal CRC configuration tells us. However, if we
have an RGB image, the PLTE can be considered ancillary, so
we will act as though it is. */
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#endif
{
png_crc_finish(png_ptr, 0);
}
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */
{
/* If we don't want to use the data from an ancillary chunk,
we have two options: an error abort, or a warning and we
ignore the data in this chunk (which should be OK, since
it's considered ancillary for a RGB or RGBA image). */
if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE))
{
if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)
{
png_chunk_error(png_ptr, "CRC error");
}
else
{
png_chunk_warning(png_ptr, "CRC error");
return;
}
}
/* Otherwise, we (optionally) emit a warning and use the chunk. */
else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN))
{
png_chunk_warning(png_ptr, "CRC error");
}
}
#endif
png_set_PLTE(png_ptr, info_ptr, palette, num);
#if defined(PNG_READ_tRNS_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
if (png_ptr->num_trans > (png_uint_16)num)
{
png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
png_ptr->num_trans = (png_uint_16)num;
}
if (info_ptr->num_trans > (png_uint_16)num)
{
png_warning(png_ptr, "Truncating incorrect info tRNS chunk length");
info_ptr->num_trans = (png_uint_16)num;
}
}
}
#endif
}
void /* PRIVATE */
png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_debug(1, "in png_handle_IEND\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT))
{
png_error(png_ptr, "No image in file");
info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
}
png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
if (length != 0)
{
png_warning(png_ptr, "Incorrect IEND chunk length");
}
png_crc_finish(png_ptr, length);
}
#if defined(PNG_READ_gAMA_SUPPORTED)
void /* PRIVATE */
png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_fixed_point igamma;
#ifdef PNG_FLOATING_POINT_SUPPORTED
float file_gamma;
#endif
png_byte buf[4];
png_debug(1, "in png_handle_gAMA\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before gAMA");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid gAMA after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place gAMA chunk");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
#if defined(PNG_READ_sRGB_SUPPORTED)
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
)
{
png_warning(png_ptr, "Duplicate gAMA chunk");
png_crc_finish(png_ptr, length);
return;
}
if (length != 4)
{
png_warning(png_ptr, "Incorrect gAMA chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 4);
if (png_crc_finish(png_ptr, 0))
return;
igamma = (png_fixed_point)png_get_uint_32(buf);
/* check for zero gamma */
if (igamma == 0)
{
png_warning(png_ptr,
"Ignoring gAMA chunk with gamma=0");
return;
}
#if defined(PNG_READ_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
if(igamma < 45000L || igamma > 46000L)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
#endif
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
#ifdef PNG_FLOATING_POINT_SUPPORTED
file_gamma = (float)igamma / (float)100000.0;
# ifdef PNG_READ_GAMMA_SUPPORTED
png_ptr->gamma = file_gamma;
# endif
png_set_gAMA(png_ptr, info_ptr, file_gamma);
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
#endif
}
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
void /* PRIVATE */
png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t truelen;
png_byte buf[4];
png_debug(1, "in png_handle_sBIT\n");
buf[0] = buf[1] = buf[2] = buf[3] = 0;
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sBIT");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid sBIT after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
{
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sBIT chunk");
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
{
png_warning(png_ptr, "Duplicate sBIT chunk");
png_crc_finish(png_ptr, length);
return;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
truelen = 3;
else
truelen = (png_size_t)png_ptr->channels;
if (length != truelen)
{
png_warning(png_ptr, "Incorrect sBIT chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, truelen);
if (png_crc_finish(png_ptr, 0))
return;
if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
{
png_ptr->sig_bit.red = buf[0];
png_ptr->sig_bit.green = buf[1];
png_ptr->sig_bit.blue = buf[2];
png_ptr->sig_bit.alpha = buf[3];
}
else
{
png_ptr->sig_bit.gray = buf[0];
png_ptr->sig_bit.red = buf[0];
png_ptr->sig_bit.green = buf[0];
png_ptr->sig_bit.blue = buf[0];
png_ptr->sig_bit.alpha = buf[1];
}
png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
}
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
void /* PRIVATE */
png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[4];
#ifdef PNG_FLOATING_POINT_SUPPORTED
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
#endif
png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
int_y_green, int_x_blue, int_y_blue;
png_uint_32 uint_x, uint_y;
png_debug(1, "in png_handle_cHRM\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before cHRM");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid cHRM after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before cHRM");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
#if defined(PNG_READ_sRGB_SUPPORTED)
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
)
{
png_warning(png_ptr, "Duplicate cHRM chunk");
png_crc_finish(png_ptr, length);
return;
}
if (length != 32)
{
png_warning(png_ptr, "Incorrect cHRM chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 4);
uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
uint_y = png_get_uint_32(buf);
if (uint_x > 80000L || uint_y > 80000L ||
uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM white point");
png_crc_finish(png_ptr, 24);
return;
}
int_x_white = (png_fixed_point)uint_x;
int_y_white = (png_fixed_point)uint_y;
png_crc_read(png_ptr, buf, 4);
uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
uint_y = png_get_uint_32(buf);
if (uint_x > 80000L || uint_y > 80000L ||
uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM red point");
png_crc_finish(png_ptr, 16);
return;
}
int_x_red = (png_fixed_point)uint_x;
int_y_red = (png_fixed_point)uint_y;
png_crc_read(png_ptr, buf, 4);
uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
uint_y = png_get_uint_32(buf);
if (uint_x > 80000L || uint_y > 80000L ||
uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM green point");
png_crc_finish(png_ptr, 8);
return;
}
int_x_green = (png_fixed_point)uint_x;
int_y_green = (png_fixed_point)uint_y;
png_crc_read(png_ptr, buf, 4);
uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
uint_y = png_get_uint_32(buf);
if (uint_x > 80000L || uint_y > 80000L ||
uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM blue point");
png_crc_finish(png_ptr, 0);
return;
}
int_x_blue = (png_fixed_point)uint_x;
int_y_blue = (png_fixed_point)uint_y;
#ifdef PNG_FLOATING_POINT_SUPPORTED
white_x = (float)int_x_white / (float)100000.0;
white_y = (float)int_y_white / (float)100000.0;
red_x = (float)int_x_red / (float)100000.0;
red_y = (float)int_y_red / (float)100000.0;
green_x = (float)int_x_green / (float)100000.0;
green_y = (float)int_y_green / (float)100000.0;
blue_x = (float)int_x_blue / (float)100000.0;
blue_y = (float)int_y_blue / (float)100000.0;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
{
if (abs(int_x_white - 31270L) > 1000 ||
abs(int_y_white - 32900L) > 1000 ||
abs(int_x_red - 64000L) > 1000 ||
abs(int_y_red - 33000L) > 1000 ||
abs(int_x_green - 30000L) > 1000 ||
abs(int_y_green - 60000L) > 1000 ||
abs(int_x_blue - 15000L) > 1000 ||
abs(int_y_blue - 6000L) > 1000)
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
#ifdef PNG_FLOATING_POINT_SUPPORTED
fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
white_x, white_y, red_x, red_y);
fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
green_x, green_y, blue_x, blue_y);
#else
fprintf(stderr,"wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
int_x_white, int_y_white, int_x_red, int_y_red);
fprintf(stderr,"gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
int_x_green, int_y_green, int_x_blue, int_y_blue);
#endif
#endif /* PNG_NO_CONSOLE_IO */
}
png_crc_finish(png_ptr, 0);
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_cHRM(png_ptr, info_ptr,
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_set_cHRM_fixed(png_ptr, info_ptr,
int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
int_y_green, int_x_blue, int_y_blue);
#endif
if (png_crc_finish(png_ptr, 0))
return;
}
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
void /* PRIVATE */
png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
int intent;
png_byte buf[1];
png_debug(1, "in png_handle_sRGB\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sRGB");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid sRGB after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sRGB chunk");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
{
png_warning(png_ptr, "Duplicate sRGB chunk");
png_crc_finish(png_ptr, length);
return;
}
if (length != 1)
{
png_warning(png_ptr, "Incorrect sRGB chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 1);
if (png_crc_finish(png_ptr, 0))
return;
intent = buf[0];
/* check for bad intent */
if (intent >= PNG_sRGB_INTENT_LAST)
{
png_warning(png_ptr, "Unknown sRGB intent");
return;
}
#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
if ((info_ptr->valid & PNG_INFO_gAMA))
{
int igamma;
#ifdef PNG_FIXED_POINT_SUPPORTED
igamma=(int)info_ptr->int_gamma;
#else
# ifdef PNG_FLOATING_POINT_SUPPORTED
igamma=(int)(info_ptr->gamma * 100000.);
# endif
#endif
if(igamma < 45000L || igamma > 46000L)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
# ifdef PNG_FIXED_POINT_SUPPORTED
fprintf(stderr,"incorrect gamma=(%d/100000)\n",(int)png_ptr->int_gamma);
# else
# ifdef PNG_FLOATING_POINT_SUPPORTED
fprintf(stderr,"incorrect gamma=%f\n",png_ptr->gamma);
# endif
# endif
#endif
}
}
#endif /* PNG_READ_gAMA_SUPPORTED */
#ifdef PNG_READ_cHRM_SUPPORTED
#ifdef PNG_FIXED_POINT_SUPPORTED
if (info_ptr->valid & PNG_INFO_cHRM)
if (abs(info_ptr->int_x_white - 31270L) > 1000 ||
abs(info_ptr->int_y_white - 32900L) > 1000 ||
abs(info_ptr->int_x_red - 64000L) > 1000 ||
abs(info_ptr->int_y_red - 33000L) > 1000 ||
abs(info_ptr->int_x_green - 30000L) > 1000 ||
abs(info_ptr->int_y_green - 60000L) > 1000 ||
abs(info_ptr->int_x_blue - 15000L) > 1000 ||
abs(info_ptr->int_y_blue - 6000L) > 1000)
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
}
#endif /* PNG_FIXED_POINT_SUPPORTED */
#endif /* PNG_READ_cHRM_SUPPORTED */
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
}
#endif /* PNG_READ_sRGB_SUPPORTED */
#if defined(PNG_READ_iCCP_SUPPORTED)
void /* PRIVATE */
png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Note: this does not properly handle chunks that are > 64K under DOS */
{
png_charp chunkdata;
png_byte compression_type;
png_bytep pC;
png_charp profile;
png_uint_32 skip = 0;
png_uint_32 profile_size = 0;
png_uint_32 profile_length = 0;
png_size_t slength, prefix_length, data_length;
png_debug(1, "in png_handle_iCCP\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before iCCP");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid iCCP after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place iCCP chunk");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
{
png_warning(png_ptr, "Duplicate iCCP chunk");
png_crc_finish(png_ptr, length);
return;
}
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr, "iCCP chunk too large to fit in memory");
skip = length - (png_uint_32)65535L;
length = (png_uint_32)65535L;
}
#endif
chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
if (png_crc_finish(png_ptr, skip))
{
png_free(png_ptr, chunkdata);
return;
}
chunkdata[slength] = 0x00;
for (profile = chunkdata; *profile; profile++)
/* empty loop to find end of name */ ;
++profile;
/* there should be at least one zero (the compression type byte)
following the separator, and we should be on it */
if ( profile >= chunkdata + slength)
{
png_free(png_ptr, chunkdata);
png_warning(png_ptr, "Malformed iCCP chunk");
return;
}
/* compression_type should always be zero */
compression_type = *profile++;
if (compression_type)
{
png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
compression_type=0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8
wrote nonzero) */
}
prefix_length = profile - chunkdata;
chunkdata = png_decompress_chunk(png_ptr, compression_type, chunkdata,
slength, prefix_length, &data_length);
profile_length = data_length - prefix_length;
if ( prefix_length > data_length || profile_length < 4)
{
png_free(png_ptr, chunkdata);
png_warning(png_ptr, "Profile size field missing from iCCP chunk");
return;
}
/* Check the profile_size recorded in the first 32 bits of the ICC profile */
pC = (png_bytep)(chunkdata+prefix_length);
profile_size = ((*(pC ))<<24) |
((*(pC+1))<<16) |
((*(pC+2))<< 8) |
((*(pC+3)) );
if(profile_size < profile_length)
profile_length = profile_size;
if(profile_size > profile_length)
{
png_free(png_ptr, chunkdata);
png_warning(png_ptr, "Ignoring truncated iCCP profile.\n");
return;
}
png_set_iCCP(png_ptr, info_ptr, chunkdata, compression_type,
chunkdata + prefix_length, profile_length);
png_free(png_ptr, chunkdata);
}
#endif /* PNG_READ_iCCP_SUPPORTED */
#if defined(PNG_READ_sPLT_SUPPORTED)
void /* PRIVATE */
png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Note: this does not properly handle chunks that are > 64K under DOS */
{
png_bytep chunkdata;
png_bytep entry_start;
png_sPLT_t new_palette;
#ifdef PNG_NO_POINTER_INDEXING
png_sPLT_entryp pp;
#endif
int data_length, entry_size, i;
png_uint_32 skip = 0;
png_size_t slength;
png_debug(1, "in png_handle_sPLT\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sPLT");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid sPLT after IDAT");
png_crc_finish(png_ptr, length);
return;
}
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr, "sPLT chunk too large to fit in memory");
skip = length - (png_uint_32)65535L;
length = (png_uint_32)65535L;
}
#endif
chunkdata = (png_bytep)png_malloc(png_ptr, length + 1);
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
if (png_crc_finish(png_ptr, skip))
{
png_free(png_ptr, chunkdata);
return;
}
chunkdata[slength] = 0x00;
for (entry_start = chunkdata; *entry_start; entry_start++)
/* empty loop to find end of name */ ;
++entry_start;
/* a sample depth should follow the separator, and we should be on it */
if (entry_start > chunkdata + slength)
{
png_free(png_ptr, chunkdata);
png_warning(png_ptr, "malformed sPLT chunk");
return;
}
new_palette.depth = *entry_start++;
entry_size = (new_palette.depth == 8 ? 6 : 10);
data_length = (slength - (entry_start - chunkdata));
/* integrity-check the data length */
if (data_length % entry_size)
{
png_free(png_ptr, chunkdata);
png_warning(png_ptr, "sPLT chunk has bad length");
return;
}
new_palette.nentries = data_length / entry_size;
new_palette.entries = (png_sPLT_entryp)png_malloc(
png_ptr, new_palette.nentries * sizeof(png_sPLT_entry));
#ifndef PNG_NO_POINTER_INDEXING
for (i = 0; i < new_palette.nentries; i++)
{
png_sPLT_entryp pp = new_palette.entries + i;
if (new_palette.depth == 8)
{
pp->red = *entry_start++;
pp->green = *entry_start++;
pp->blue = *entry_start++;
pp->alpha = *entry_start++;
}
else
{
pp->red = png_get_uint_16(entry_start); entry_start += 2;
pp->green = png_get_uint_16(entry_start); entry_start += 2;
pp->blue = png_get_uint_16(entry_start); entry_start += 2;
pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
}
pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
}
#else
pp = new_palette.entries;
for (i = 0; i < new_palette.nentries; i++)
{
if (new_palette.depth == 8)
{
pp[i].red = *entry_start++;
pp[i].green = *entry_start++;
pp[i].blue = *entry_start++;
pp[i].alpha = *entry_start++;
}
else
{
pp[i].red = png_get_uint_16(entry_start); entry_start += 2;
pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
pp[i].blue = png_get_uint_16(entry_start); entry_start += 2;
pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
}
pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
}
#endif
/* discard all chunk data except the name and stash that */
new_palette.name = (png_charp)chunkdata;
png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
png_free(png_ptr, chunkdata);
png_free(png_ptr, new_palette.entries);
}
#endif /* PNG_READ_sPLT_SUPPORTED */
#if defined(PNG_READ_tRNS_SUPPORTED)
void /* PRIVATE */
png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
png_debug(1, "in png_handle_tRNS\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before tRNS");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid tRNS after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_warning(png_ptr, "Duplicate tRNS chunk");
png_crc_finish(png_ptr, length);
return;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (!(png_ptr->mode & PNG_HAVE_PLTE))
{
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before tRNS");
}
else if (length > (png_uint_32)png_ptr->num_palette)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
return;
}
if (length == 0)
{
png_warning(png_ptr, "Zero length tRNS chunk");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, readbuf, (png_size_t)length);
png_ptr->num_trans = (png_uint_16)length;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
png_byte buf[6];
if (length != 6)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, (png_size_t)length);
png_ptr->num_trans = 1;
png_ptr->trans_values.red = png_get_uint_16(buf);
png_ptr->trans_values.green = png_get_uint_16(buf + 2);
png_ptr->trans_values.blue = png_get_uint_16(buf + 4);
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
png_byte buf[6];
if (length != 2)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 2);
png_ptr->num_trans = 1;
png_ptr->trans_values.gray = png_get_uint_16(buf);
}
else
{
png_warning(png_ptr, "tRNS chunk not allowed with alpha channel");
png_crc_finish(png_ptr, length);
return;
}
if (png_crc_finish(png_ptr, 0))
return;
png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
&(png_ptr->trans_values));
}
#endif
#if defined(PNG_READ_bKGD_SUPPORTED)
void /* PRIVATE */
png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t truelen;
png_byte buf[6];
png_debug(1, "in png_handle_bKGD\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before bKGD");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid bKGD after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
{
png_warning(png_ptr, "Missing PLTE before bKGD");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
{
png_warning(png_ptr, "Duplicate bKGD chunk");
png_crc_finish(png_ptr, length);
return;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
truelen = 1;
else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
truelen = 6;
else
truelen = 2;
if (length != truelen)
{
png_warning(png_ptr, "Incorrect bKGD chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, truelen);
if (png_crc_finish(png_ptr, 0))
return;
/* We convert the index value into RGB components so that we can allow
* arbitrary RGB values for background when we have transparency, and
* so it is easy to determine the RGB values of the background color
* from the info_ptr struct. */
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_ptr->background.index = buf[0];
if(info_ptr->num_palette)
{
if(buf[0] > info_ptr->num_palette)
{
png_warning(png_ptr, "Incorrect bKGD chunk index value");
return;
}
png_ptr->background.red =
(png_uint_16)png_ptr->palette[buf[0]].red;
png_ptr->background.green =
(png_uint_16)png_ptr->palette[buf[0]].green;
png_ptr->background.blue =
(png_uint_16)png_ptr->palette[buf[0]].blue;
}
}
else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
{
png_ptr->background.red =
png_ptr->background.green =
png_ptr->background.blue =
png_ptr->background.gray = png_get_uint_16(buf);
}
else
{
png_ptr->background.red = png_get_uint_16(buf);
png_ptr->background.green = png_get_uint_16(buf + 2);
png_ptr->background.blue = png_get_uint_16(buf + 4);
}
png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background));
}
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
void /* PRIVATE */
png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
int num, i;
png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
png_debug(1, "in png_handle_hIST\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before hIST");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid hIST after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (!(png_ptr->mode & PNG_HAVE_PLTE))
{
png_warning(png_ptr, "Missing PLTE before hIST");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
{
png_warning(png_ptr, "Duplicate hIST chunk");
png_crc_finish(png_ptr, length);
return;
}
num = (int)length / 2 ;
if (num != png_ptr->num_palette)
{
png_warning(png_ptr, "Incorrect hIST chunk length");
png_crc_finish(png_ptr, length);
return;
}
for (i = 0; i < num; i++)
{
png_byte buf[2];
png_crc_read(png_ptr, buf, 2);
readbuf[i] = png_get_uint_16(buf);
}
if (png_crc_finish(png_ptr, 0))
return;
png_set_hIST(png_ptr, info_ptr, readbuf);
}
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
void /* PRIVATE */
png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[9];
png_uint_32 res_x, res_y;
int unit_type;
png_debug(1, "in png_handle_pHYs\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before pHYs");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid pHYs after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
png_warning(png_ptr, "Duplicate pHYs chunk");
png_crc_finish(png_ptr, length);
return;
}
if (length != 9)
{
png_warning(png_ptr, "Incorrect pHYs chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 9);
if (png_crc_finish(png_ptr, 0))
return;
res_x = png_get_uint_32(buf);
res_y = png_get_uint_32(buf + 4);
unit_type = buf[8];
png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
}
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
void /* PRIVATE */
png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[9];
png_int_32 offset_x, offset_y;
int unit_type;
png_debug(1, "in png_handle_oFFs\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before oFFs");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid oFFs after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
{
png_warning(png_ptr, "Duplicate oFFs chunk");
png_crc_finish(png_ptr, length);
return;
}
if (length != 9)
{
png_warning(png_ptr, "Incorrect oFFs chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 9);
if (png_crc_finish(png_ptr, 0))
return;
offset_x = png_get_int_32(buf);
offset_y = png_get_int_32(buf + 4);
unit_type = buf[8];
png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
}
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
/* read the pCAL chunk (described in the PNG Extensions document) */
void /* PRIVATE */
png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_charp purpose;
png_int_32 X0, X1;
png_byte type, nparams;
png_charp buf, units, endptr;
png_charpp params;
png_size_t slength;
int i;
png_debug(1, "in png_handle_pCAL\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before pCAL");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid pCAL after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
{
png_warning(png_ptr, "Duplicate pCAL chunk");
png_crc_finish(png_ptr, length);
return;
}
png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)\n",
length + 1);
purpose = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (purpose == NULL)
{
png_warning(png_ptr, "No memory for pCAL purpose.");
return;
}
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)purpose, slength);
if (png_crc_finish(png_ptr, 0))
{
png_free(png_ptr, purpose);
return;
}
purpose[slength] = 0x00; /* null terminate the last string */
png_debug(3, "Finding end of pCAL purpose string\n");
for (buf = purpose; *buf; buf++)
/* empty loop */ ;
endptr = purpose + slength;
/* We need to have at least 12 bytes after the purpose string
in order to get the parameter information. */
if (endptr <= buf + 12)
{
png_warning(png_ptr, "Invalid pCAL data");
png_free(png_ptr, purpose);
return;
}
png_debug(3, "Reading pCAL X0, X1, type, nparams, and units\n");
X0 = png_get_int_32((png_bytep)buf+1);
X1 = png_get_int_32((png_bytep)buf+5);
type = buf[9];
nparams = buf[10];
units = buf + 11;
png_debug(3, "Checking pCAL equation type and number of parameters\n");
/* Check that we have the right number of parameters for known
equation types. */
if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
(type == PNG_EQUATION_BASE_E && nparams != 3) ||
(type == PNG_EQUATION_ARBITRARY && nparams != 3) ||
(type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
{
png_warning(png_ptr, "Invalid pCAL parameters for equation type");
png_free(png_ptr, purpose);
return;
}
else if (type >= PNG_EQUATION_LAST)
{
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
}
for (buf = units; *buf; buf++)
/* Empty loop to move past the units string. */ ;
png_debug(3, "Allocating pCAL parameters array\n");
params = (png_charpp)png_malloc_warn(png_ptr, (png_uint_32)(nparams
*sizeof(png_charp))) ;
if (params == NULL)
{
png_free(png_ptr, purpose);
png_warning(png_ptr, "No memory for pCAL params.");
return;
}
/* Get pointers to the start of each parameter string. */
for (i = 0; i < (int)nparams; i++)
{
buf++; /* Skip the null string terminator from previous parameter. */
png_debug1(3, "Reading pCAL parameter %d\n", i);
for (params[i] = buf; *buf != 0x00 && buf <= endptr; buf++)
/* Empty loop to move past each parameter string */ ;
/* Make sure we haven't run out of data yet */
if (buf > endptr)
{
png_warning(png_ptr, "Invalid pCAL data");
png_free(png_ptr, purpose);
png_free(png_ptr, params);
return;
}
}
png_set_pCAL(png_ptr, info_ptr, purpose, X0, X1, type, nparams,
units, params);
png_free(png_ptr, purpose);
png_free(png_ptr, params);
}
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
/* read the sCAL chunk */
void /* PRIVATE */
png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_charp buffer, ep;
#ifdef PNG_FLOATING_POINT_SUPPORTED
double width, height;
png_charp vp;
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_charp swidth, sheight;
#endif
#endif
png_size_t slength;
png_debug(1, "in png_handle_sCAL\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sCAL");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid sCAL after IDAT");
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
{
png_warning(png_ptr, "Duplicate sCAL chunk");
png_crc_finish(png_ptr, length);
return;
}
png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)\n",
length + 1);
buffer = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (buffer == NULL)
{
png_warning(png_ptr, "Out of memory while processing sCAL chunk");
return;
}
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)buffer, slength);
if (png_crc_finish(png_ptr, 0))
{
png_free(png_ptr, buffer);
return;
}
buffer[slength] = 0x00; /* null terminate the last string */
ep = buffer + 1; /* skip unit byte */
#ifdef PNG_FLOATING_POINT_SUPPORTED
width = strtod(ep, &vp);
if (*vp)
{
png_warning(png_ptr, "malformed width string in sCAL chunk");
return;
}
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
if (swidth == NULL)
{
png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
return;
}
png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
#endif
#endif
for (ep = buffer; *ep; ep++)
/* empty loop */ ;
ep++;
#ifdef PNG_FLOATING_POINT_SUPPORTED
height = strtod(ep, &vp);
if (*vp)
{
png_warning(png_ptr, "malformed height string in sCAL chunk");
return;
}
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
if (swidth == NULL)
{
png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
return;
}
png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
#endif
#endif
if (buffer + slength < ep
#ifdef PNG_FLOATING_POINT_SUPPORTED
|| width <= 0. || height <= 0.
#endif
)
{
png_warning(png_ptr, "Invalid sCAL data");
png_free(png_ptr, buffer);
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, swidth);
png_free(png_ptr, sheight);
#endif
return;
}
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_sCAL(png_ptr, info_ptr, buffer[0], width, height);
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_set_sCAL_s(png_ptr, info_ptr, buffer[0], swidth, sheight);
#endif
#endif
png_free(png_ptr, buffer);
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, swidth);
png_free(png_ptr, sheight);
#endif
}
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
void /* PRIVATE */
png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[7];
png_time mod_time;
png_debug(1, "in png_handle_tIME\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Out of place tIME chunk");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
{
png_warning(png_ptr, "Duplicate tIME chunk");
png_crc_finish(png_ptr, length);
return;
}
if (png_ptr->mode & PNG_HAVE_IDAT)
png_ptr->mode |= PNG_AFTER_IDAT;
if (length != 7)
{
png_warning(png_ptr, "Incorrect tIME chunk length");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buf, 7);
if (png_crc_finish(png_ptr, 0))
return;
mod_time.second = buf[6];
mod_time.minute = buf[5];
mod_time.hour = buf[4];
mod_time.day = buf[3];
mod_time.month = buf[2];
mod_time.year = png_get_uint_16(buf);
png_set_tIME(png_ptr, info_ptr, &mod_time);
}
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
/* Note: this does not properly handle chunks that are > 64K under DOS */
void /* PRIVATE */
png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_textp text_ptr;
png_charp key;
png_charp text;
png_uint_32 skip = 0;
png_size_t slength;
int ret;
png_debug(1, "in png_handle_tEXt\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before tEXt");
if (png_ptr->mode & PNG_HAVE_IDAT)
png_ptr->mode |= PNG_AFTER_IDAT;
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr, "tEXt chunk too large to fit in memory");
skip = length - (png_uint_32)65535L;
length = (png_uint_32)65535L;
}
#endif
key = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (key == NULL)
{
png_warning(png_ptr, "No memory to process text chunk.");
return;
}
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)key, slength);
if (png_crc_finish(png_ptr, skip))
{
png_free(png_ptr, key);
return;
}
key[slength] = 0x00;
for (text = key; *text; text++)
/* empty loop to find end of key */ ;
if (text != key + slength)
text++;
text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text));
if (text_ptr == NULL)
{
png_warning(png_ptr, "Not enough memory to process text chunk.");
png_free(png_ptr, key);
return;
}
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->key = key;
#ifdef PNG_iTXt_SUPPORTED
text_ptr->lang = NULL;
text_ptr->lang_key = NULL;
text_ptr->itxt_length = 0;
#endif
text_ptr->text = text;
text_ptr->text_length = png_strlen(text);
ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, key);
png_free(png_ptr, text_ptr);
if (ret)
png_warning(png_ptr, "Insufficient memory to process text chunk.");
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
/* note: this does not correctly handle chunks that are > 64K under DOS */
void /* PRIVATE */
png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_textp text_ptr;
png_charp chunkdata;
png_charp text;
int comp_type;
int ret;
png_size_t slength, prefix_len, data_len;
png_debug(1, "in png_handle_zTXt\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before zTXt");
if (png_ptr->mode & PNG_HAVE_IDAT)
png_ptr->mode |= PNG_AFTER_IDAT;
#ifdef PNG_MAX_MALLOC_64K
/* We will no doubt have problems with chunks even half this size, but
there is no hard and fast rule to tell us where to stop. */
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr,"zTXt chunk too large to fit in memory");
png_crc_finish(png_ptr, length);
return;
}
#endif
chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (chunkdata == NULL)
{
png_warning(png_ptr,"Out of memory processing zTXt chunk.");
return;
}
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
if (png_crc_finish(png_ptr, 0))
{
png_free(png_ptr, chunkdata);
return;
}
chunkdata[slength] = 0x00;
for (text = chunkdata; *text; text++)
/* empty loop */ ;
/* zTXt must have some text after the chunkdataword */
if (text == chunkdata + slength)
{
comp_type = PNG_TEXT_COMPRESSION_NONE;
png_warning(png_ptr, "Zero length zTXt chunk");
}
else
{
comp_type = *(++text);
if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
{
png_warning(png_ptr, "Unknown compression type in zTXt chunk");
comp_type = PNG_TEXT_COMPRESSION_zTXt;
}
text++; /* skip the compression_method byte */
}
prefix_len = text - chunkdata;
chunkdata = (png_charp)png_decompress_chunk(png_ptr, comp_type, chunkdata,
(png_size_t)length, prefix_len, &data_len);
text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text));
if (text_ptr == NULL)
{
png_warning(png_ptr,"Not enough memory to process zTXt chunk.");
png_free(png_ptr, chunkdata);
return;
}
text_ptr->compression = comp_type;
text_ptr->key = chunkdata;
#ifdef PNG_iTXt_SUPPORTED
text_ptr->lang = NULL;
text_ptr->lang_key = NULL;
text_ptr->itxt_length = 0;
#endif
text_ptr->text = chunkdata + prefix_len;
text_ptr->text_length = data_len;
ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr);
png_free(png_ptr, chunkdata);
if (ret)
png_error(png_ptr, "Insufficient memory to store zTXt chunk.");
}
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
/* note: this does not correctly handle chunks that are > 64K under DOS */
void /* PRIVATE */
png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_textp text_ptr;
png_charp chunkdata;
png_charp key, lang, text, lang_key;
int comp_flag;
int comp_type = 0;
int ret;
png_size_t slength, prefix_len, data_len;
png_debug(1, "in png_handle_iTXt\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before iTXt");
if (png_ptr->mode & PNG_HAVE_IDAT)
png_ptr->mode |= PNG_AFTER_IDAT;
#ifdef PNG_MAX_MALLOC_64K
/* We will no doubt have problems with chunks even half this size, but
there is no hard and fast rule to tell us where to stop. */
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr,"iTXt chunk too large to fit in memory");
png_crc_finish(png_ptr, length);
return;
}
#endif
chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (chunkdata == NULL)
{
png_warning(png_ptr, "No memory to process iTXt chunk.");
return;
}
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
if (png_crc_finish(png_ptr, 0))
{
png_free(png_ptr, chunkdata);
return;
}
chunkdata[slength] = 0x00;
for (lang = chunkdata; *lang; lang++)
/* empty loop */ ;
lang++; /* skip NUL separator */
/* iTXt must have a language tag (possibly empty), two compression bytes,
translated keyword (possibly empty), and possibly some text after the
keyword */
if (lang >= chunkdata + slength)
{
comp_flag = PNG_TEXT_COMPRESSION_NONE;
png_warning(png_ptr, "Zero length iTXt chunk");
}
else
{
comp_flag = *lang++;
comp_type = *lang++;
}
for (lang_key = lang; *lang_key; lang_key++)
/* empty loop */ ;
lang_key++; /* skip NUL separator */
for (text = lang_key; *text; text++)
/* empty loop */ ;
text++; /* skip NUL separator */
prefix_len = text - chunkdata;
key=chunkdata;
if (comp_flag)
chunkdata = png_decompress_chunk(png_ptr, comp_type, chunkdata,
(size_t)length, prefix_len, &data_len);
else
data_len=png_strlen(chunkdata + prefix_len);
text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text));
if (text_ptr == NULL)
{
png_warning(png_ptr,"Not enough memory to process iTXt chunk.");
png_free(png_ptr, chunkdata);
return;
}
text_ptr->compression = (int)comp_flag + 1;
text_ptr->lang_key = chunkdata+(lang_key-key);
text_ptr->lang = chunkdata+(lang-key);
text_ptr->itxt_length = data_len;
text_ptr->text_length = 0;
text_ptr->key = chunkdata;
text_ptr->text = chunkdata + prefix_len;
ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr);
png_free(png_ptr, chunkdata);
if (ret)
png_error(png_ptr, "Insufficient memory to store iTXt chunk.");
}
#endif
/* This function is called when we haven't found a handler for a
chunk. If there isn't a problem with the chunk itself (ie bad
chunk name, CRC, or a critical chunk), the chunk is silently ignored
-- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
case it will be saved away to be written out later. */
void /* PRIVATE */
png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_uint_32 skip = 0;
png_debug(1, "in png_handle_unknown\n");
if (png_ptr->mode & PNG_HAVE_IDAT)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
#endif
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
png_ptr->mode |= PNG_AFTER_IDAT;
}
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
if (!(png_ptr->chunk_name[0] & 0x20))
{
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
HANDLE_CHUNK_ALWAYS
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
&& png_ptr->read_user_chunk_fn == NULL
#endif
)
#endif
png_chunk_error(png_ptr, "unknown critical chunk");
}
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
{
png_unknown_chunk chunk;
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr, "unknown chunk too large to fit in memory");
skip = length - (png_uint_32)65535L;
length = (png_uint_32)65535L;
}
#endif
png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
chunk.data = (png_bytep)png_malloc(png_ptr, length);
chunk.size = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)chunk.data, length);
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
if(png_ptr->read_user_chunk_fn != NULL)
{
/* callback to user unknown chunk handler */
if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
{
if (!(png_ptr->chunk_name[0] & 0x20))
if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
HANDLE_CHUNK_ALWAYS)
{
png_free(png_ptr, chunk.data);
png_chunk_error(png_ptr, "unknown critical chunk");
}
png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
}
}
else
#endif
png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
png_free(png_ptr, chunk.data);
}
else
#endif
skip = length;
png_crc_finish(png_ptr, skip);
#if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
#endif
}
/* This function is called to verify that a chunk name is valid.
This function can't have the "critical chunk check" incorporated
into it, since in the future we will need to be able to call user
functions to handle unknown critical chunks after we check that
the chunk name itself is valid. */
#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
void /* PRIVATE */
png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
{
png_debug(1, "in png_check_chunk_name\n");
if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3]))
{
png_chunk_error(png_ptr, "invalid chunk type");
}
}
/* Combines the row recently read in with the existing pixels in the
row. This routine takes care of alpha and transparency if requested.
This routine also handles the two methods of progressive display
of interlaced images, depending on the mask value.
The mask value describes which pixels are to be combined with
the row. The pattern always repeats every 8 pixels, so just 8
bits are needed. A one indicates the pixel is to be combined,
a zero indicates the pixel is to be skipped. This is in addition
to any alpha or transparency value associated with the pixel. If
you want all pixels to be combined, pass 0xff (255) in mask. */
#ifndef PNG_HAVE_ASSEMBLER_COMBINE_ROW
void /* PRIVATE */
png_combine_row(png_structp png_ptr, png_bytep row, int mask)
{
png_debug(1,"in png_combine_row\n");
if (mask == 0xff)
{
png_memcpy(row, png_ptr->row_buf + 1,
(png_size_t)((png_ptr->width *
png_ptr->row_info.pixel_depth + 7) >> 3));
}
else
{
switch (png_ptr->row_info.pixel_depth)
{
case 1:
{
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
int s_inc, s_start, s_end;
int m = 0x80;
int shift;
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
s_end = 7;
s_inc = 1;
}
else
#endif
{
s_start = 7;
s_end = 0;
s_inc = -1;
}
shift = s_start;
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
int value;
value = (*sp >> shift) & 0x01;
*dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
if (shift == s_end)
{
shift = s_start;
sp++;
dp++;
}
else
shift += s_inc;
if (m == 1)
m = 0x80;
else
m >>= 1;
}
break;
}
case 2:
{
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
int s_start, s_end, s_inc;
int m = 0x80;
int shift;
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
int value;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
s_end = 6;
s_inc = 2;
}
else
#endif
{
s_start = 6;
s_end = 0;
s_inc = -2;
}
shift = s_start;
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
value = (*sp >> shift) & 0x03;
*dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
if (shift == s_end)
{
shift = s_start;
sp++;
dp++;
}
else
shift += s_inc;
if (m == 1)
m = 0x80;
else
m >>= 1;
}
break;
}
case 4:
{
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
int s_start, s_end, s_inc;
int m = 0x80;
int shift;
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
int value;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
s_end = 4;
s_inc = 4;
}
else
#endif
{
s_start = 4;
s_end = 0;
s_inc = -4;
}
shift = s_start;
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
value = (*sp >> shift) & 0xf;
*dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
if (shift == s_end)
{
shift = s_start;
sp++;
dp++;
}
else
shift += s_inc;
if (m == 1)
m = 0x80;
else
m >>= 1;
}
break;
}
default:
{
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
png_byte m = 0x80;
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
png_memcpy(dp, sp, pixel_bytes);
}
sp += pixel_bytes;
dp += pixel_bytes;
if (m == 1)
m = 0x80;
else
m >>= 1;
}
break;
}
}
}
}
#endif /* !PNG_HAVE_ASSEMBLER_COMBINE_ROW */
#ifdef PNG_READ_INTERLACING_SUPPORTED
#ifndef PNG_HAVE_ASSEMBLER_READ_INTERLACE /* else in pngvcrd.c, pnggccrd.c */
/* OLD pre-1.0.9 interface:
void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
png_uint_32 transformations)
*/
void /* PRIVATE */
png_do_read_interlace(png_structp png_ptr)
{
png_row_infop row_info = &(png_ptr->row_info);
png_bytep row = png_ptr->row_buf + 1;
int pass = png_ptr->pass;
png_uint_32 transformations = png_ptr->transformations;
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* offset to next interlace block */
const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
#endif
png_debug(1,"in png_do_read_interlace (stock C version)\n");
if (row != NULL && row_info != NULL)
{
png_uint_32 final_width;
final_width = row_info->width * png_pass_inc[pass];
switch (row_info->pixel_depth)
{
case 1:
{
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
int sshift, dshift;
int s_start, s_end, s_inc;
int jstop = png_pass_inc[pass];
png_byte v;
png_uint_32 i;
int j;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
sshift = (int)((row_info->width + 7) & 0x07);
dshift = (int)((final_width + 7) & 0x07);
s_start = 7;
s_end = 0;
s_inc = -1;
}
else
#endif
{
sshift = 7 - (int)((row_info->width + 7) & 0x07);
dshift = 7 - (int)((final_width + 7) & 0x07);
s_start = 0;
s_end = 7;
s_inc = 1;
}
for (i = 0; i < row_info->width; i++)
{
v = (png_byte)((*sp >> sshift) & 0x01);
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
else
dshift += s_inc;
}
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
else
sshift += s_inc;
}
break;
}
case 2:
{
png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
int sshift, dshift;
int s_start, s_end, s_inc;
int jstop = png_pass_inc[pass];
png_uint_32 i;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
sshift = (int)(((row_info->width + 3) & 0x03) << 1);
dshift = (int)(((final_width + 3) & 0x03) << 1);
s_start = 6;
s_end = 0;
s_inc = -2;
}
else
#endif
{
sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
s_start = 0;
s_end = 6;
s_inc = 2;
}
for (i = 0; i < row_info->width; i++)
{
png_byte v;
int j;
v = (png_byte)((*sp >> sshift) & 0x03);
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
else
dshift += s_inc;
}
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
else
sshift += s_inc;
}
break;
}
case 4:
{
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
int sshift, dshift;
int s_start, s_end, s_inc;
png_uint_32 i;
int jstop = png_pass_inc[pass];
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
sshift = (int)(((row_info->width + 1) & 0x01) << 2);
dshift = (int)(((final_width + 1) & 0x01) << 2);
s_start = 4;
s_end = 0;
s_inc = -4;
}
else
#endif
{
sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
s_start = 0;
s_end = 4;
s_inc = 4;
}
for (i = 0; i < row_info->width; i++)
{
png_byte v = (png_byte)((*sp >> sshift) & 0xf);
int j;
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
else
dshift += s_inc;
}
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
else
sshift += s_inc;
}
break;
}
default:
{
png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
int jstop = png_pass_inc[pass];
png_uint_32 i;
for (i = 0; i < row_info->width; i++)
{
png_byte v[8];
int j;
png_memcpy(v, sp, pixel_bytes);
for (j = 0; j < jstop; j++)
{
png_memcpy(dp, v, pixel_bytes);
dp -= pixel_bytes;
}
sp -= pixel_bytes;
}
break;
}
}
row_info->width = final_width;
row_info->rowbytes = ((final_width *
(png_uint_32)row_info->pixel_depth + 7) >> 3);
}
#if !defined(PNG_READ_PACKSWAP_SUPPORTED)
transformations = transformations; /* silence compiler warning */
#endif
}
#endif /* !PNG_HAVE_ASSEMBLER_READ_INTERLACE */
#endif /* PNG_READ_INTERLACING_SUPPORTED */
#ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
void /* PRIVATE */
png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
png_bytep prev_row, int filter)
{
png_debug(1, "in png_read_filter_row\n");
png_debug2(2,"row = %lu, filter = %d\n", png_ptr->row_number, filter);
switch (filter)
{
case PNG_FILTER_VALUE_NONE:
break;
case PNG_FILTER_VALUE_SUB:
{
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp = row + bpp;
png_bytep lp = row;
for (i = bpp; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
rp++;
}
break;
}
case PNG_FILTER_VALUE_UP:
{
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
png_bytep rp = row;
png_bytep pp = prev_row;
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
break;
}
case PNG_FILTER_VALUE_AVG:
{
png_uint_32 i;
png_bytep rp = row;
png_bytep pp = prev_row;
png_bytep lp = row;
png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
png_uint_32 istop = row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) +
((int)(*pp++) / 2 )) & 0xff);
rp++;
}
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) +
(int)(*pp++ + *lp++) / 2 ) & 0xff);
rp++;
}
break;
}
case PNG_FILTER_VALUE_PAETH:
{
png_uint_32 i;
png_bytep rp = row;
png_bytep pp = prev_row;
png_bytep lp = row;
png_bytep cp = prev_row;
png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
png_uint_32 istop=row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
for (i = 0; i < istop; i++) /* use leftover rp,pp */
{
int a, b, c, pa, pb, pc, p;
a = *lp++;
b = *pp++;
c = *cp++;
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
/*
if (pa <= pb && pa <= pc)
p = a;
else if (pb <= pc)
p = b;
else
p = c;
*/
p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
*rp = (png_byte)(((int)(*rp) + p) & 0xff);
rp++;
}
break;
}
default:
png_warning(png_ptr, "Ignoring bad adaptive filter type");
*row=0;
break;
}
}
#endif /* !PNG_HAVE_ASSEMBLER_READ_FILTER_ROW */
void /* PRIVATE */
png_read_finish_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
png_debug(1, "in png_read_finish_row\n");
png_ptr->row_number++;
if (png_ptr->row_number < png_ptr->num_rows)
return;
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
do
{
png_ptr->pass++;
if (png_ptr->pass >= 7)
break;
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
png_ptr->irowbytes = ((png_ptr->iwidth *
(png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
if (!(png_ptr->transformations & PNG_INTERLACE))
{
png_ptr->num_rows = (png_ptr->height +
png_pass_yinc[png_ptr->pass] - 1 -
png_pass_ystart[png_ptr->pass]) /
png_pass_yinc[png_ptr->pass];
if (!(png_ptr->num_rows))
continue;
}
else /* if (png_ptr->transformations & PNG_INTERLACE) */
break;
} while (png_ptr->iwidth == 0);
if (png_ptr->pass < 7)
return;
}
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
#endif
char extra;
int ret;
png_ptr->zstream.next_out = (Byte *)&extra;
png_ptr->zstream.avail_out = (uInt)1;
for(;;)
{
if (!(png_ptr->zstream.avail_in))
{
while (!png_ptr->idat_size)
{
png_byte chunk_length[4];
png_crc_finish(png_ptr, 0);
png_read_data(png_ptr, chunk_length, 4);
png_ptr->idat_size = png_get_uint_32(chunk_length);
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
}
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_in = png_ptr->zbuf;
if (png_ptr->zbuf_size > png_ptr->idat_size)
png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in);
png_ptr->idat_size -= png_ptr->zstream.avail_in;
}
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
if (ret == Z_STREAM_END)
{
if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in ||
png_ptr->idat_size)
png_warning(png_ptr, "Extra compressed data");
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
}
if (ret != Z_OK)
png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
"Decompression Error");
if (!(png_ptr->zstream.avail_out))
{
png_warning(png_ptr, "Extra compressed data.");
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
}
}
png_ptr->zstream.avail_out = 0;
}
if (png_ptr->idat_size || png_ptr->zstream.avail_in)
png_warning(png_ptr, "Extra compression data");
inflateReset(&png_ptr->zstream);
png_ptr->mode |= PNG_AFTER_IDAT;
}
void /* PRIVATE */
png_read_start_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
int max_pixel_depth;
png_uint_32 row_bytes;
png_debug(1, "in png_read_start_row\n");
png_ptr->zstream.avail_in = 0;
// png_init_read_transformations(png_ptr);
if (png_ptr->interlaced)
{
if (!(png_ptr->transformations & PNG_INTERLACE))
png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
png_pass_ystart[0]) / png_pass_yinc[0];
else
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
row_bytes = ((png_ptr->iwidth *
(png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
png_ptr->irowbytes = (png_size_t)row_bytes;
if((png_uint_32)png_ptr->irowbytes != row_bytes)
png_error(png_ptr, "Rowbytes overflow in png_read_start_row");
}
else
{
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = png_ptr->width;
png_ptr->irowbytes = png_ptr->rowbytes + 1;
}
max_pixel_depth = png_ptr->pixel_depth;
#if defined(PNG_READ_PACK_SUPPORTED)
if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8)
max_pixel_depth = 8;
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
if (png_ptr->transformations & PNG_EXPAND)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (png_ptr->num_trans)
max_pixel_depth = 32;
else
max_pixel_depth = 24;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
if (max_pixel_depth < 8)
max_pixel_depth = 8;
if (png_ptr->num_trans)
max_pixel_depth *= 2;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
if (png_ptr->num_trans)
{
max_pixel_depth *= 4;
max_pixel_depth /= 3;
}
}
}
#endif
#if defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & (PNG_FILLER))
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
max_pixel_depth = 32;
else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
if (max_pixel_depth <= 8)
max_pixel_depth = 16;
else
max_pixel_depth = 32;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
if (max_pixel_depth <= 32)
max_pixel_depth = 32;
else
max_pixel_depth = 64;
}
}
#endif
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
if (png_ptr->transformations & PNG_GRAY_TO_RGB)
{
if (
#if defined(PNG_READ_EXPAND_SUPPORTED)
(png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
#endif
#if defined(PNG_READ_FILLER_SUPPORTED)
(png_ptr->transformations & (PNG_FILLER)) ||
#endif
png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (max_pixel_depth <= 16)
max_pixel_depth = 32;
else
max_pixel_depth = 64;
}
else
{
if (max_pixel_depth <= 8)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
max_pixel_depth = 32;
else
max_pixel_depth = 24;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
max_pixel_depth = 64;
else
max_pixel_depth = 48;
}
}
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
if(png_ptr->transformations & PNG_USER_TRANSFORM)
{
int user_pixel_depth=png_ptr->user_transform_depth*
png_ptr->user_transform_channels;
if(user_pixel_depth > max_pixel_depth)
max_pixel_depth=user_pixel_depth;
}
#endif
/* align the width on the next larger 8 pixels. Mainly used
for interlacing */
row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
/* calculate the maximum bytes needed, adding a byte and a pixel
for safety's sake */
row_bytes = ((row_bytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
1 + ((max_pixel_depth + 7) >> 3);
#ifdef PNG_MAX_MALLOC_64K
if (row_bytes > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
png_ptr->row_buf = png_ptr->big_row_buf+32;
#if defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)
png_ptr->row_buf_size = row_bytes;
#endif
#ifdef PNG_MAX_MALLOC_64K
if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
png_ptr->rowbytes + 1));
png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_debug1(3, "width = %lu,\n", png_ptr->width);
png_debug1(3, "height = %lu,\n", png_ptr->height);
png_debug1(3, "iwidth = %lu,\n", png_ptr->iwidth);
png_debug1(3, "num_rows = %lu\n", png_ptr->num_rows);
png_debug1(3, "rowbytes = %lu,\n", png_ptr->rowbytes);
png_debug1(3, "irowbytes = %lu,\n", png_ptr->irowbytes);
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
libavformat/libpng/pngwrite.c deleted 100644 → 0
View file @ 496b6ff2
/* pngwrite.c - general routines to write a PNG file
*
* libpng 1.0.15 - October 3, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
/* get internal access to png.h */
#define PNG_INTERNAL
#include "png.h"
#ifdef PNG_WRITE_SUPPORTED
void png_write_init(png_struct *png_ptr)
{
png_debug(1, "in png_write_init_3\n");
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
1, png_doublep_NULL, png_doublep_NULL);
#endif
}
/* Writes all the PNG information. This is the suggested way to use the
* library. If you have a new chunk to add, make a function to write it,
* and put it in the correct location here. If you want the chunk written
* after the image data, put it in png_write_end(). I strongly encourage
* you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
* the chunk, as that will keep the code from breaking if you want to just
* write a plain PNG file. If you have long comments, I suggest writing
* them in png_write_end(), and compressing them.
*/
void PNGAPI
png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_write_info_before_PLTE\n");
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
{
png_write_sig(png_ptr); /* write PNG signature */
#if defined(PNG_MNG_FEATURES_SUPPORTED)
if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
{
png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
png_ptr->mng_features_permitted=0;
}
#endif
/* write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
info_ptr->filter_type,
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
info_ptr->interlace_type);
#else
0);
#endif
/* the rest of these check to see if the valid field has the appropriate
flag set, and if it does, writes the chunk. */
#if defined(PNG_WRITE_gAMA_SUPPORTED)
if (info_ptr->valid & PNG_INFO_gAMA)
{
# ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_gAMA(png_ptr, info_ptr->gamma);
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
# endif
#endif
}
#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
#endif
#if defined(PNG_WRITE_iCCP_SUPPORTED)
if (info_ptr->valid & PNG_INFO_iCCP)
png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sBIT)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
if (info_ptr->valid & PNG_INFO_cHRM)
{
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_cHRM(png_ptr,
info_ptr->x_white, info_ptr->y_white,
info_ptr->x_red, info_ptr->y_red,
info_ptr->x_green, info_ptr->y_green,
info_ptr->x_blue, info_ptr->y_blue);
#else
# ifdef PNG_FIXED_POINT_SUPPORTED
png_write_cHRM_fixed(png_ptr,
info_ptr->int_x_white, info_ptr->int_y_white,
info_ptr->int_x_red, info_ptr->int_y_red,
info_ptr->int_x_green, info_ptr->int_y_green,
info_ptr->int_x_blue, info_ptr->int_y_blue);
# endif
#endif
}
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
png_unknown_chunk *up;
png_debug(5, "writing extra chunks\n");
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
{
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != HANDLE_CHUNK_NEVER &&
up->location && (!(up->location & PNG_HAVE_PLTE)) &&
((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
#endif
png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
}
}
void PNGAPI
png_write_info(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
int i;
#endif
png_debug(1, "in png_write_info\n");
png_write_info_before_PLTE(png_ptr, info_ptr);
if (info_ptr->valid & PNG_INFO_PLTE)
png_write_PLTE(png_ptr, info_ptr->palette,
(png_uint_32)info_ptr->num_palette);
else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
png_error(png_ptr, "Valid palette required for paletted images\n");
#if defined(PNG_WRITE_tRNS_SUPPORTED)
if (info_ptr->valid & PNG_INFO_tRNS)
{
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel (in tRNS) */
if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
int j;
for (j=0; j<(int)info_ptr->num_trans; j++)
info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
}
#endif
png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
info_ptr->num_trans, info_ptr->color_type);
}
#endif
#if defined(PNG_WRITE_bKGD_SUPPORTED)
if (info_ptr->valid & PNG_INFO_bKGD)
png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
#endif
#if defined(PNG_WRITE_hIST_SUPPORTED)
if (info_ptr->valid & PNG_INFO_hIST)
png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
#endif
#if defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_oFFs)
png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
info_ptr->offset_unit_type);
#endif
#if defined(PNG_WRITE_pCAL_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pCAL)
png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
info_ptr->pcal_units, info_ptr->pcal_params);
#endif
#if defined(PNG_WRITE_sCAL_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sCAL)
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_s_width, info_ptr->scal_s_height);
#else
png_warning(png_ptr,
"png_write_sCAL not supported; sCAL chunk not written.\n");
#endif
#endif
#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pHYs)
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
if (info_ptr->valid & PNG_INFO_tIME)
{
png_write_tIME(png_ptr, &(info_ptr->mod_time));
png_ptr->mode |= PNG_WROTE_tIME;
}
#endif
#if defined(PNG_WRITE_sPLT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sPLT)
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
#endif
#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* Check to see if we need to write text chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing header text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
/* an internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
info_ptr->text[i].lang,
info_ptr->text[i].lang_key,
info_ptr->text[i].text);
#else
png_warning(png_ptr, "Unable to write international text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
/* If we want a compressed text chunk */
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
png_warning(png_ptr, "Unable to write compressed text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
}
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text,
0);
#else
png_warning(png_ptr, "Unable to write uncompressed text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
}
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
png_unknown_chunk *up;
png_debug(5, "writing extra chunks\n");
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
{
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != HANDLE_CHUNK_NEVER &&
up->location && (up->location & PNG_HAVE_PLTE) &&
!(up->location & PNG_HAVE_IDAT) &&
((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
#endif
}
/* Writes the end of the PNG file. If you don't want to write comments or
* time information, you can pass NULL for info. If you already wrote these
* in png_write_info(), do not write them again here. If you have long
* comments, I suggest writing them here, and compressing them.
*/
void PNGAPI
png_write_end(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_write_end\n");
if (!(png_ptr->mode & PNG_HAVE_IDAT))
png_error(png_ptr, "No IDATs written into file");
/* see if user wants us to write information chunks */
if (info_ptr != NULL)
{
#if defined(PNG_WRITE_TEXT_SUPPORTED)
int i; /* local index variable */
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* check to see if user has supplied a time chunk */
if ((info_ptr->valid & PNG_INFO_tIME) &&
!(png_ptr->mode & PNG_WROTE_tIME))
png_write_tIME(png_ptr, &(info_ptr->mod_time));
#endif
#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* loop through comment chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
/* an internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
info_ptr->text[i].lang,
info_ptr->text[i].lang_key,
info_ptr->text[i].text);
#else
png_warning(png_ptr, "Unable to write international text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
png_warning(png_ptr, "Unable to write compressed text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
}
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0);
#else
png_warning(png_ptr, "Unable to write uncompressed text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
}
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
png_unknown_chunk *up;
png_debug(5, "writing extra chunks\n");
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
{
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != HANDLE_CHUNK_NEVER &&
up->location && (up->location & PNG_AFTER_IDAT) &&
((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
#endif
}
png_ptr->mode |= PNG_AFTER_IDAT;
/* write end of PNG file */
png_write_IEND(png_ptr);
#if 0
/* This flush, added in libpng-1.0.8, causes some applications to crash
because they do not set png_ptr->output_flush_fn */
png_flush(png_ptr);
#endif
}
#if defined(PNG_WRITE_tIME_SUPPORTED)
#if !defined(_WIN32_WCE)
/* "time.h" functions are not supported on WindowsCE */
void PNGAPI
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
{
png_debug(1, "in png_convert_from_struct_tm\n");
ptime->year = (png_uint_16)(1900 + ttime->tm_year);
ptime->month = (png_byte)(ttime->tm_mon + 1);
ptime->day = (png_byte)ttime->tm_mday;
ptime->hour = (png_byte)ttime->tm_hour;
ptime->minute = (png_byte)ttime->tm_min;
ptime->second = (png_byte)ttime->tm_sec;
}
void PNGAPI
png_convert_from_time_t(png_timep ptime, time_t ttime)
{
struct tm *tbuf;
png_debug(1, "in png_convert_from_time_t\n");
tbuf = gmtime(&ttime);
png_convert_from_struct_tm(ptime, tbuf);
}
#endif
#endif
/* called by user to write a row of image data */
void PNGAPI
png_write_row(png_structp png_ptr, png_bytep row)
{
png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
png_ptr->row_number, png_ptr->pass);
/* initialize transformations and other stuff if first time */
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
/* make sure we wrote the header info */
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
png_error(png_ptr,
"png_write_info was never called before png_write_row.");
/* check for transforms that have been set but were defined out */
#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & PNG_FILLER)
png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK)
png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
if (png_ptr->transformations & PNG_BGR)
png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
#endif
png_write_start_row(png_ptr);
}
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* if interlaced and not interested in row, return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
{
case 0:
if (png_ptr->row_number & 0x07)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 1:
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 2:
if ((png_ptr->row_number & 0x07) != 4)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 3:
if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 4:
if ((png_ptr->row_number & 0x03) != 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 5:
if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 6:
if (!(png_ptr->row_number & 0x01))
{
png_write_finish_row(png_ptr);
return;
}
break;
}
}
#endif
/* set up row info for transformations */
png_ptr->row_info.color_type = png_ptr->color_type;
png_ptr->row_info.width = png_ptr->usr_width;
png_ptr->row_info.channels = png_ptr->usr_channels;
png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
png_ptr->row_info.channels);
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
/* Copy user's row into buffer, leaving room for filter byte. */
png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
png_ptr->row_info.rowbytes);
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* handle interlacing */
if (png_ptr->interlaced && png_ptr->pass < 6 &&
(png_ptr->transformations & PNG_INTERLACE))
{
png_do_write_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass);
/* this should always get caught above, but still ... */
if (!(png_ptr->row_info.width))
{
png_write_finish_row(png_ptr);
return;
}
}
#endif
#if 0
/* handle other transformations */
if (png_ptr->transformations)
png_do_write_transformations(png_ptr);
#endif
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* Write filter_method 64 (intrapixel differencing) only if
* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
* 2. Libpng did not write a PNG signature (this filter_method is only
* used in PNG datastreams that are embedded in MNG datastreams) and
* 3. The application called png_permit_mng_features with a mask that
* included PNG_FLAG_MNG_FILTER_64 and
* 4. The filter_method is 64 and
* 5. The color_type is RGB or RGBA
*/
if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
/* Intrapixel differencing */
png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
}
#endif
/* Find a filter if necessary, filter the row and write it out. */
png_write_find_filter(png_ptr, &(png_ptr->row_info));
if (png_ptr->write_row_fn != NULL)
(*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
}
/* Free any memory used in png_ptr struct (old method) */
void /* PRIVATE */
png_write_destroy(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* save jump buffer */
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn;
#endif
png_debug(1, "in png_write_destroy\n");
/* free any memory zlib uses */
deflateEnd(&png_ptr->zstream);
/* free our memory. png_free checks NULL for us. */
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->row_buf);
png_free(png_ptr, png_ptr->prev_row);
png_free(png_ptr, png_ptr->sub_row);
png_free(png_ptr, png_ptr->up_row);
png_free(png_ptr, png_ptr->avg_row);
png_free(png_ptr, png_ptr->paeth_row);
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
#endif
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_free(png_ptr, png_ptr->prev_filters);
png_free(png_ptr, png_ptr->filter_weights);
png_free(png_ptr, png_ptr->inv_filter_weights);
png_free(png_ptr, png_ptr->filter_costs);
png_free(png_ptr, png_ptr->inv_filter_costs);
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* reset structure */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
#endif
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
png_memset(png_ptr, 0, sizeof (png_struct));
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
#endif
}
/* Allow the application to select one or more row filters to use. */
void PNGAPI
png_set_filter(png_structp png_ptr, int method, int filters)
{
png_debug(1, "in png_set_filter\n");
#if defined(PNG_MNG_FEATURES_SUPPORTED)
if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(method == PNG_INTRAPIXEL_DIFFERENCING))
method = PNG_FILTER_TYPE_BASE;
#endif
if (method == PNG_FILTER_TYPE_BASE)
{
switch (filters & (PNG_ALL_FILTERS | 0x07))
{
case 5:
case 6:
case 7: png_warning(png_ptr, "Unknown row filter for method 0");
case PNG_FILTER_VALUE_NONE: png_ptr->do_filter=PNG_FILTER_NONE; break;
case PNG_FILTER_VALUE_SUB: png_ptr->do_filter=PNG_FILTER_SUB; break;
case PNG_FILTER_VALUE_UP: png_ptr->do_filter=PNG_FILTER_UP; break;
case PNG_FILTER_VALUE_AVG: png_ptr->do_filter=PNG_FILTER_AVG; break;
case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter=PNG_FILTER_PAETH;break;
default: png_ptr->do_filter = (png_byte)filters; break;
}
/* If we have allocated the row_buf, this means we have already started
* with the image and we should have allocated all of the filter buffers
* that have been selected. If prev_row isn't already allocated, then
* it is too late to start using the filters that need it, since we
* will be missing the data in the previous row. If an application
* wants to start and stop using particular filters during compression,
* it should start out with all of the filters, and then add and
* remove them after the start of compression.
*/
if (png_ptr->row_buf != NULL)
{
if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Up filter after starting");
png_ptr->do_filter &= ~PNG_FILTER_UP;
}
else
{
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
}
if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Average filter after starting");
png_ptr->do_filter &= ~PNG_FILTER_AVG;
}
else
{
png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
}
}
if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
png_ptr->paeth_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Paeth filter after starting");
png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
}
else
{
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
}
if (png_ptr->do_filter == PNG_NO_FILTERS)
png_ptr->do_filter = PNG_FILTER_NONE;
}
}
else
png_error(png_ptr, "Unknown custom filter method");
}
/* This allows us to influence the way in which libpng chooses the "best"
* filter for the current scanline. While the "minimum-sum-of-absolute-
* differences metric is relatively fast and effective, there is some
* question as to whether it can be improved upon by trying to keep the
* filtered data going to zlib more consistent, hopefully resulting in
* better compression.
*/
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
void PNGAPI
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
int num_weights, png_doublep filter_weights,
png_doublep filter_costs)
{
int i;
png_debug(1, "in png_set_filter_heuristics\n");
if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
{
png_warning(png_ptr, "Unknown filter heuristic method");
return;
}
if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
{
heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
}
if (num_weights < 0 || filter_weights == NULL ||
heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
{
num_weights = 0;
}
png_ptr->num_prev_filters = (png_byte)num_weights;
png_ptr->heuristic_method = (png_byte)heuristic_method;
if (num_weights > 0)
{
if (png_ptr->prev_filters == NULL)
{
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_byte) * num_weights));
/* To make sure that the weighting starts out fairly */
for (i = 0; i < num_weights; i++)
{
png_ptr->prev_filters[i] = 255;
}
}
if (png_ptr->filter_weights == NULL)
{
png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * num_weights));
png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * num_weights));
for (i = 0; i < num_weights; i++)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
}
for (i = 0; i < num_weights; i++)
{
if (filter_weights[i] < 0.0)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
else
{
png_ptr->inv_filter_weights[i] =
(png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
png_ptr->filter_weights[i] =
(png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
}
}
}
/* If, in the future, there are other filter methods, this would
* need to be based on png_ptr->filter.
*/
if (png_ptr->filter_costs == NULL)
{
png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
{
png_ptr->inv_filter_costs[i] =
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
}
}
/* Here is where we set the relative costs of the different filters. We
* should take the desired compression level into account when setting
* the costs, so that Paeth, for instance, has a high relative cost at low
* compression levels, while it has a lower relative cost at higher
* compression settings. The filter types are in order of increasing
* relative cost, so it would be possible to do this with an algorithm.
*/
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
{
if (filter_costs == NULL || filter_costs[i] < 0.0)
{
png_ptr->inv_filter_costs[i] =
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
}
else if (filter_costs[i] >= 1.0)
{
png_ptr->inv_filter_costs[i] =
(png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
png_ptr->filter_costs[i] =
(png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
}
}
}
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
void PNGAPI
png_set_compression_level(png_structp png_ptr, int level)
{
png_debug(1, "in png_set_compression_level\n");
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
png_ptr->zlib_level = level;
}
void PNGAPI
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
{
png_debug(1, "in png_set_compression_mem_level\n");
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
png_ptr->zlib_mem_level = mem_level;
}
void PNGAPI
png_set_compression_strategy(png_structp png_ptr, int strategy)
{
png_debug(1, "in png_set_compression_strategy\n");
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
png_ptr->zlib_strategy = strategy;
}
void PNGAPI
png_set_compression_window_bits(png_structp png_ptr, int window_bits)
{
if (window_bits > 15)
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
else if (window_bits < 8)
png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
#ifndef WBITS_8_OK
/* avoid libpng bug with 256-byte windows */
if (window_bits == 8)
{
png_warning(png_ptr, "Compression window is being reset to 512");
window_bits=9;
}
#endif
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
png_ptr->zlib_window_bits = window_bits;
}
void PNGAPI
png_set_compression_method(png_structp png_ptr, int method)
{
png_debug(1, "in png_set_compression_method\n");
if (method != 8)
png_warning(png_ptr, "Only compression method 8 is supported by PNG");
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
png_ptr->zlib_method = method;
}
#endif /* PNG_WRITE_SUPPORTED */
libavformat/libpng/pngwutil.c deleted 100644 → 0
View file @ 496b6ff2
/* pngwutil.c - utilities to write a PNG file
*
* libpng 1.0.15 - October 3, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#include "png.h"
#ifdef PNG_WRITE_SUPPORTED
/* Place a 32-bit number into a buffer in PNG byte order. We work
* with unsigned numbers for convenience, although one supported
* ancillary chunk uses signed (two's complement) numbers.
*/
void /* PRIVATE */
png_save_uint_32(png_bytep buf, png_uint_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
buf[1] = (png_byte)((i >> 16) & 0xff);
buf[2] = (png_byte)((i >> 8) & 0xff);
buf[3] = (png_byte)(i & 0xff);
}
#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
/* The png_save_int_32 function assumes integers are stored in two's
* complement format. If this isn't the case, then this routine needs to
* be modified to write data in two's complement format.
*/
void /* PRIVATE */
png_save_int_32(png_bytep buf, png_int_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
buf[1] = (png_byte)((i >> 16) & 0xff);
buf[2] = (png_byte)((i >> 8) & 0xff);
buf[3] = (png_byte)(i & 0xff);
}
#endif
/* Place a 16-bit number into a buffer in PNG byte order.
* The parameter is declared unsigned int, not png_uint_16,
* just to avoid potential problems on pre-ANSI C compilers.
*/
void /* PRIVATE */
png_save_uint_16(png_bytep buf, unsigned int i)
{
buf[0] = (png_byte)((i >> 8) & 0xff);
buf[1] = (png_byte)(i & 0xff);
}
/* Write a PNG chunk all at once. The type is an array of ASCII characters
* representing the chunk name. The array must be at least 4 bytes in
* length, and does not need to be null terminated. To be safe, pass the
* pre-defined chunk names here, and if you need a new one, define it
* where the others are defined. The length is the length of the data.
* All the data must be present. If that is not possible, use the
* png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
* functions instead.
*/
void PNGAPI
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
png_bytep data, png_size_t length)
{
png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
png_write_chunk_data(png_ptr, data, length);
png_write_chunk_end(png_ptr);
}
/* Write the start of a PNG chunk. The type is the chunk type.
* The total_length is the sum of the lengths of all the data you will be
* passing in png_write_chunk_data().
*/
void PNGAPI
png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
png_uint_32 length)
{
png_byte buf[4];
png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
/* write the length */
png_save_uint_32(buf, length);
png_write_data(png_ptr, buf, (png_size_t)4);
/* write the chunk name */
png_write_data(png_ptr, chunk_name, (png_size_t)4);
/* reset the crc and run it over the chunk name */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, chunk_name, (png_size_t)4);
}
/* Write the data of a PNG chunk started with png_write_chunk_start().
* Note that multiple calls to this function are allowed, and that the
* sum of the lengths from these calls *must* add up to the total_length
* given to png_write_chunk_start().
*/
void PNGAPI
png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
/* write the data, and run the CRC over it */
if (data != NULL && length > 0)
{
png_calculate_crc(png_ptr, data, length);
png_write_data(png_ptr, data, length);
}
}
/* Finish a chunk started with png_write_chunk_start(). */
void PNGAPI
png_write_chunk_end(png_structp png_ptr)
{
png_byte buf[4];
/* write the crc */
png_save_uint_32(buf, png_ptr->crc);
png_write_data(png_ptr, buf, (png_size_t)4);
}
/* Simple function to write the signature. If we have already written
* the magic bytes of the signature, or more likely, the PNG stream is
* being embedded into another stream and doesn't need its own signature,
* we should call png_set_sig_bytes() to tell libpng how many of the
* bytes have already been written.
*/
void /* PRIVATE */
png_write_sig(png_structp png_ptr)
{
png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
/* write the rest of the 8 byte signature */
png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
(png_size_t)8 - png_ptr->sig_bytes);
if(png_ptr->sig_bytes < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
/*
* This pair of functions encapsulates the operation of (a) compressing a
* text string, and (b) issuing it later as a series of chunk data writes.
* The compression_state structure is shared context for these functions
* set up by the caller in order to make the whole mess thread-safe.
*/
typedef struct
{
char *input; /* the uncompressed input data */
int input_len; /* its length */
int num_output_ptr; /* number of output pointers used */
int max_output_ptr; /* size of output_ptr */
png_charpp output_ptr; /* array of pointers to output */
} compression_state;
/* compress given text into storage in the png_ptr structure */
static int /* PRIVATE */
png_text_compress(png_structp png_ptr,
png_charp text, png_size_t text_len, int compression,
compression_state *comp)
{
int ret;
comp->num_output_ptr = comp->max_output_ptr = 0;
comp->output_ptr = NULL;
comp->input = NULL;
/* we may just want to pass the text right through */
if (compression == PNG_TEXT_COMPRESSION_NONE)
{
comp->input = text;
comp->input_len = text_len;
return((int)text_len);
}
if (compression >= PNG_TEXT_COMPRESSION_LAST)
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[50];
sprintf(msg, "Unknown compression type %d", compression);
png_warning(png_ptr, msg);
#else
png_warning(png_ptr, "Unknown compression type");
#endif
}
/* We can't write the chunk until we find out how much data we have,
* which means we need to run the compressor first and save the
* output. This shouldn't be a problem, as the vast majority of
* comments should be reasonable, but we will set up an array of
* malloc'd pointers to be sure.
*
* If we knew the application was well behaved, we could simplify this
* greatly by assuming we can always malloc an output buffer large
* enough to hold the compressed text ((1001 * text_len / 1000) + 12)
* and malloc this directly. The only time this would be a bad idea is
* if we can't malloc more than 64K and we have 64K of random input
* data, or if the input string is incredibly large (although this
* wouldn't cause a failure, just a slowdown due to swapping).
*/
/* set up the compression buffers */
png_ptr->zstream.avail_in = (uInt)text_len;
png_ptr->zstream.next_in = (Bytef *)text;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf;
/* this is the same compression loop as in png_write_row() */
do
{
/* compress the data */
ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
if (ret != Z_OK)
{
/* error */
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
png_error(png_ptr, "zlib error");
}
/* check to see if we need more room */
if (!png_ptr->zstream.avail_out && png_ptr->zstream.avail_in)
{
/* make sure the output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
{
int old_max;
old_max = comp->max_output_ptr;
comp->max_output_ptr = comp->num_output_ptr + 4;
if (comp->output_ptr != NULL)
{
png_charpp old_ptr;
old_ptr = comp->output_ptr;
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
png_memcpy(comp->output_ptr, old_ptr, old_max
* sizeof (png_charp));
png_free(png_ptr, old_ptr);
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
}
/* save the data */
comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size);
comp->num_output_ptr++;
/* and reset the buffer */
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_out = png_ptr->zbuf;
}
/* continue until we don't have any more to compress */
} while (png_ptr->zstream.avail_in);
/* finish the compression */
do
{
/* tell zlib we are finished */
ret = deflate(&png_ptr->zstream, Z_FINISH);
if (ret == Z_OK)
{
/* check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
/* check to make sure our output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
{
int old_max;
old_max = comp->max_output_ptr;
comp->max_output_ptr = comp->num_output_ptr + 4;
if (comp->output_ptr != NULL)
{
png_charpp old_ptr;
old_ptr = comp->output_ptr;
/* This could be optimized to realloc() */
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
png_memcpy(comp->output_ptr, old_ptr,
old_max * sizeof (png_charp));
png_free(png_ptr, old_ptr);
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
}
/* save off the data */
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size);
png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size);
comp->num_output_ptr++;
/* and reset the buffer pointers */
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_out = png_ptr->zbuf;
}
}
else if (ret != Z_STREAM_END)
{
/* we got an error */
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
png_error(png_ptr, "zlib error");
}
} while (ret != Z_STREAM_END);
/* text length is number of buffers plus last buffer */
text_len = png_ptr->zbuf_size * comp->num_output_ptr;
if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;
return((int)text_len);
}
/* ship the compressed text out via chunk writes */
static void /* PRIVATE */
png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
{
int i;
/* handle the no-compression case */
if (comp->input)
{
png_write_chunk_data(png_ptr, (png_bytep)comp->input,
(png_size_t)comp->input_len);
return;
}
/* write saved output buffers, if any */
for (i = 0; i < comp->num_output_ptr; i++)
{
png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],
png_ptr->zbuf_size);
png_free(png_ptr, comp->output_ptr[i]);
comp->output_ptr[i]=NULL;
}
if (comp->max_output_ptr != 0)
png_free(png_ptr, comp->output_ptr);
comp->output_ptr=NULL;
/* write anything left in zbuf */
if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
png_write_chunk_data(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
/* reset zlib for another zTXt/iTXt or the image data */
deflateReset(&png_ptr->zstream);
}
#endif
/* Write the IHDR chunk, and update the png_struct with the necessary
* information. Note that the rest of this code depends upon this
* information being correct.
*/
void /* PRIVATE */
png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
int bit_depth, int color_type, int compression_type, int filter_type,
int interlace_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IHDR;
#endif
png_byte buf[13]; /* buffer to store the IHDR info */
png_debug(1, "in png_write_IHDR\n");
/* Check that we have valid input data from the application info */
switch (color_type)
{
case PNG_COLOR_TYPE_GRAY:
switch (bit_depth)
{
case 1:
case 2:
case 4:
case 8:
case 16: png_ptr->channels = 1; break;
default: png_error(png_ptr,"Invalid bit depth for grayscale image");
}
break;
case PNG_COLOR_TYPE_RGB:
if (bit_depth != 8 && bit_depth != 16)
png_error(png_ptr, "Invalid bit depth for RGB image");
png_ptr->channels = 3;
break;
case PNG_COLOR_TYPE_PALETTE:
switch (bit_depth)
{
case 1:
case 2:
case 4:
case 8: png_ptr->channels = 1; break;
default: png_error(png_ptr, "Invalid bit depth for paletted image");
}
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
if (bit_depth != 8 && bit_depth != 16)
png_error(png_ptr, "Invalid bit depth for grayscale+alpha image");
png_ptr->channels = 2;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
if (bit_depth != 8 && bit_depth != 16)
png_error(png_ptr, "Invalid bit depth for RGBA image");
png_ptr->channels = 4;
break;
default:
png_error(png_ptr, "Invalid image color type specified");
}
if (compression_type != PNG_COMPRESSION_TYPE_BASE)
{
png_warning(png_ptr, "Invalid compression type specified");
compression_type = PNG_COMPRESSION_TYPE_BASE;
}
/* Write filter_method 64 (intrapixel differencing) only if
* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
* 2. Libpng did not write a PNG signature (this filter_method is only
* used in PNG datastreams that are embedded in MNG datastreams) and
* 3. The application called png_permit_mng_features with a mask that
* included PNG_FLAG_MNG_FILTER_64 and
* 4. The filter_method is 64 and
* 5. The color_type is RGB or RGBA
*/
if (
#if defined(PNG_MNG_FEATURES_SUPPORTED)
!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
(color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
(filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
#endif
filter_type != PNG_FILTER_TYPE_BASE)
{
png_warning(png_ptr, "Invalid filter type specified");
filter_type = PNG_FILTER_TYPE_BASE;
}
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
if (interlace_type != PNG_INTERLACE_NONE &&
interlace_type != PNG_INTERLACE_ADAM7)
{
png_warning(png_ptr, "Invalid interlace type specified");
interlace_type = PNG_INTERLACE_ADAM7;
}
#else
interlace_type=PNG_INTERLACE_NONE;
#endif
/* save off the relevent information */
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->color_type = (png_byte)color_type;
png_ptr->interlaced = (png_byte)interlace_type;
#if defined(PNG_MNG_FEATURES_SUPPORTED)
png_ptr->filter_type = (png_byte)filter_type;
#endif
png_ptr->width = width;
png_ptr->height = height;
png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
png_ptr->rowbytes = ((width * (png_size_t)png_ptr->pixel_depth + 7) >> 3);
/* set the usr info, so any transformations can modify it */
png_ptr->usr_width = png_ptr->width;
png_ptr->usr_bit_depth = png_ptr->bit_depth;
png_ptr->usr_channels = png_ptr->channels;
/* pack the header information into the buffer */
png_save_uint_32(buf, width);
png_save_uint_32(buf + 4, height);
buf[8] = (png_byte)bit_depth;
buf[9] = (png_byte)color_type;
buf[10] = (png_byte)compression_type;
buf[11] = (png_byte)filter_type;
buf[12] = (png_byte)interlace_type;
/* write the chunk */
png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
/* initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
if (!(png_ptr->do_filter))
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
png_ptr->bit_depth < 8)
png_ptr->do_filter = PNG_FILTER_NONE;
else
png_ptr->do_filter = PNG_ALL_FILTERS;
}
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY))
{
if (png_ptr->do_filter != PNG_FILTER_NONE)
png_ptr->zlib_strategy = Z_FILTERED;
else
png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY;
}
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL))
png_ptr->zlib_level = Z_DEFAULT_COMPRESSION;
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL))
png_ptr->zlib_mem_level = 8;
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS))
png_ptr->zlib_window_bits = 15;
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
png_ptr->zlib_method = 8;
deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
png_ptr->zlib_method, png_ptr->zlib_window_bits,
png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->mode = PNG_HAVE_IHDR;
}
/* write the palette. We are careful not to trust png_color to be in the
* correct order for PNG, so people can redefine it to any convenient
* structure.
*/
void /* PRIVATE */
png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_PLTE;
#endif
png_uint_32 i;
png_colorp pal_ptr;
png_byte buf[3];
png_debug(1, "in png_write_PLTE\n");
if ((
#if defined(PNG_MNG_FEATURES_SUPPORTED)
!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
#endif
num_pal == 0) || num_pal > 256)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_error(png_ptr, "Invalid number of colors in palette");
}
else
{
png_warning(png_ptr, "Invalid number of colors in palette");
return;
}
}
if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
{
png_warning(png_ptr,
"Ignoring request to write a PLTE chunk in grayscale PNG");
return;
}
png_ptr->num_palette = (png_uint_16)num_pal;
png_debug1(3, "num_palette = %d\n", png_ptr->num_palette);
png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, num_pal * 3);
#ifndef PNG_NO_POINTER_INDEXING
for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
{
buf[0] = pal_ptr->red;
buf[1] = pal_ptr->green;
buf[2] = pal_ptr->blue;
png_write_chunk_data(png_ptr, buf, (png_size_t)3);
}
#else
/* This is a little slower but some buggy compilers need to do this instead */
pal_ptr=palette;
for (i = 0; i < num_pal; i++)
{
buf[0] = pal_ptr[i].red;
buf[1] = pal_ptr[i].green;
buf[2] = pal_ptr[i].blue;
png_write_chunk_data(png_ptr, buf, (png_size_t)3);
}
#endif
png_write_chunk_end(png_ptr);
png_ptr->mode |= PNG_HAVE_PLTE;
}
/* write an IDAT chunk */
void /* PRIVATE */
png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
#endif
png_debug(1, "in png_write_IDAT\n");
png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
png_ptr->mode |= PNG_HAVE_IDAT;
}
/* write an IEND chunk */
void /* PRIVATE */
png_write_IEND(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IEND;
#endif
png_debug(1, "in png_write_IEND\n");
png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
(png_size_t)0);
png_ptr->mode |= PNG_HAVE_IEND;
}
#if defined(PNG_WRITE_gAMA_SUPPORTED)
/* write a gAMA chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void /* PRIVATE */
png_write_gAMA(png_structp png_ptr, double file_gamma)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_gAMA;
#endif
png_uint_32 igamma;
png_byte buf[4];
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/100,000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
void /* PRIVATE */
png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_gAMA;
#endif
png_byte buf[4];
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, (png_uint_32)file_gamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
}
#endif
#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
/* write a sRGB chunk */
void /* PRIVATE */
png_write_sRGB(png_structp png_ptr, int srgb_intent)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sRGB;
#endif
png_byte buf[1];
png_debug(1, "in png_write_sRGB\n");
if(srgb_intent >= PNG_sRGB_INTENT_LAST)
png_warning(png_ptr,
"Invalid sRGB rendering intent specified");
buf[0]=(png_byte)srgb_intent;
png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
}
#endif
#if defined(PNG_WRITE_iCCP_SUPPORTED)
/* write an iCCP chunk */
void /* PRIVATE */
png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
png_charp profile, int profile_len)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_iCCP;
#endif
png_size_t name_len;
png_charp new_name;
compression_state comp;
png_debug(1, "in png_write_iCCP\n");
if (name == NULL || (name_len = png_check_keyword(png_ptr, name,
&new_name)) == 0)
{
png_warning(png_ptr, "Empty keyword in iCCP chunk");
return;
}
if (compression_type != PNG_COMPRESSION_TYPE_BASE)
png_warning(png_ptr, "Unknown compression type in iCCP chunk");
if (profile == NULL)
profile_len = 0;
if (profile_len)
profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
PNG_COMPRESSION_TYPE_BASE, &comp);
/* make sure we include the NULL after the name and the compression type */
png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
(png_uint_32)name_len+profile_len+2);
new_name[name_len+1]=0x00;
png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 2);
if (profile_len)
png_write_compressed_data_out(png_ptr, &comp);
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_name);
}
#endif
#if defined(PNG_WRITE_sPLT_SUPPORTED)
/* write a sPLT chunk */
void /* PRIVATE */
png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sPLT;
#endif
png_size_t name_len;
png_charp new_name;
png_byte entrybuf[10];
int entry_size = (spalette->depth == 8 ? 6 : 10);
int palette_size = entry_size * spalette->nentries;
png_sPLT_entryp ep;
#ifdef PNG_NO_POINTER_INDEXING
int i;
#endif
png_debug(1, "in png_write_sPLT\n");
if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr,
spalette->name, &new_name))==0)
{
png_warning(png_ptr, "Empty keyword in sPLT chunk");
return;
}
/* make sure we include the NULL after the name */
png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
(png_uint_32)(name_len + 2 + palette_size));
png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
/* loop through each palette entry, writing appropriately */
#ifndef PNG_NO_POINTER_INDEXING
for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
{
if (spalette->depth == 8)
{
entrybuf[0] = (png_byte)ep->red;
entrybuf[1] = (png_byte)ep->green;
entrybuf[2] = (png_byte)ep->blue;
entrybuf[3] = (png_byte)ep->alpha;
png_save_uint_16(entrybuf + 4, ep->frequency);
}
else
{
png_save_uint_16(entrybuf + 0, ep->red);
png_save_uint_16(entrybuf + 2, ep->green);
png_save_uint_16(entrybuf + 4, ep->blue);
png_save_uint_16(entrybuf + 6, ep->alpha);
png_save_uint_16(entrybuf + 8, ep->frequency);
}
png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
}
#else
ep=spalette->entries;
for (i=0; i>spalette->nentries; i++)
{
if (spalette->depth == 8)
{
entrybuf[0] = (png_byte)ep[i].red;
entrybuf[1] = (png_byte)ep[i].green;
entrybuf[2] = (png_byte)ep[i].blue;
entrybuf[3] = (png_byte)ep[i].alpha;
png_save_uint_16(entrybuf + 4, ep[i].frequency);
}
else
{
png_save_uint_16(entrybuf + 0, ep[i].red);
png_save_uint_16(entrybuf + 2, ep[i].green);
png_save_uint_16(entrybuf + 4, ep[i].blue);
png_save_uint_16(entrybuf + 6, ep[i].alpha);
png_save_uint_16(entrybuf + 8, ep[i].frequency);
}
png_write_chunk_data(png_ptr, entrybuf, entry_size);
}
#endif
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_name);
}
#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
/* write the sBIT chunk */
void /* PRIVATE */
png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sBIT;
#endif
png_byte buf[4];
png_size_t size;
png_debug(1, "in png_write_sBIT\n");
/* make sure we don't depend upon the order of PNG_COLOR_8 */
if (color_type & PNG_COLOR_MASK_COLOR)
{
png_byte maxbits;
maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 :
png_ptr->usr_bit_depth);
if (sbit->red == 0 || sbit->red > maxbits ||
sbit->green == 0 || sbit->green > maxbits ||
sbit->blue == 0 || sbit->blue > maxbits)
{
png_warning(png_ptr, "Invalid sBIT depth specified");
return;
}
buf[0] = sbit->red;
buf[1] = sbit->green;
buf[2] = sbit->blue;
size = 3;
}
else
{
if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth)
{
png_warning(png_ptr, "Invalid sBIT depth specified");
return;
}
buf[0] = sbit->gray;
size = 1;
}
if (color_type & PNG_COLOR_MASK_ALPHA)
{
if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth)
{
png_warning(png_ptr, "Invalid sBIT depth specified");
return;
}
buf[size++] = sbit->alpha;
}
png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size);
}
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
/* write the cHRM chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void /* PRIVATE */
png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
double red_x, double red_y, double green_x, double green_y,
double blue_x, double blue_y)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_cHRM;
#endif
png_byte buf[32];
png_uint_32 itemp;
png_debug(1, "in png_write_cHRM\n");
/* each value is saved in 1/100,000ths */
if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
white_x + white_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM white point specified");
#if !defined(PNG_NO_CONSOLE_IO)
fprintf(stderr,"white_x=%f, white_y=%f\n",white_x, white_y);
#endif
return;
}
itemp = (png_uint_32)(white_x * 100000.0 + 0.5);
png_save_uint_32(buf, itemp);
itemp = (png_uint_32)(white_y * 100000.0 + 0.5);
png_save_uint_32(buf + 4, itemp);
if (red_x < 0 || red_x > 0.8 || red_y < 0 || red_y > 0.8 ||
red_x + red_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM red point specified");
return;
}
itemp = (png_uint_32)(red_x * 100000.0 + 0.5);
png_save_uint_32(buf + 8, itemp);
itemp = (png_uint_32)(red_y * 100000.0 + 0.5);
png_save_uint_32(buf + 12, itemp);
if (green_x < 0 || green_x > 0.8 || green_y < 0 || green_y > 0.8 ||
green_x + green_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM green point specified");
return;
}
itemp = (png_uint_32)(green_x * 100000.0 + 0.5);
png_save_uint_32(buf + 16, itemp);
itemp = (png_uint_32)(green_y * 100000.0 + 0.5);
png_save_uint_32(buf + 20, itemp);
if (blue_x < 0 || blue_x > 0.8 || blue_y < 0 || blue_y > 0.8 ||
blue_x + blue_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM blue point specified");
return;
}
itemp = (png_uint_32)(blue_x * 100000.0 + 0.5);
png_save_uint_32(buf + 24, itemp);
itemp = (png_uint_32)(blue_y * 100000.0 + 0.5);
png_save_uint_32(buf + 28, itemp);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
void /* PRIVATE */
png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
png_fixed_point blue_y)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_cHRM;
#endif
png_byte buf[32];
png_debug(1, "in png_write_cHRM\n");
/* each value is saved in 1/100,000ths */
if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM white point specified");
#if !defined(PNG_NO_CONSOLE_IO)
fprintf(stderr,"white_x=%ld, white_y=%ld\n",white_x, white_y);
#endif
return;
}
png_save_uint_32(buf, (png_uint_32)white_x);
png_save_uint_32(buf + 4, (png_uint_32)white_y);
if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM fixed red point specified");
return;
}
png_save_uint_32(buf + 8, (png_uint_32)red_x);
png_save_uint_32(buf + 12, (png_uint_32)red_y);
if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM green point specified");
return;
}
png_save_uint_32(buf + 16, (png_uint_32)green_x);
png_save_uint_32(buf + 20, (png_uint_32)green_y);
if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
return;
}
png_save_uint_32(buf + 24, (png_uint_32)blue_x);
png_save_uint_32(buf + 28, (png_uint_32)blue_y);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
#endif
#endif
#if defined(PNG_WRITE_tRNS_SUPPORTED)
/* write the tRNS chunk */
void /* PRIVATE */
png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
int num_trans, int color_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_tRNS;
#endif
png_byte buf[6];
png_debug(1, "in png_write_tRNS\n");
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
{
png_warning(png_ptr,"Invalid number of transparent colors specified");
return;
}
/* write the chunk out as it is */
png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
{
/* one 16 bit value */
if(tran->gray >= (1 << png_ptr->bit_depth))
{
png_warning(png_ptr,
"Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
return;
}
png_save_uint_16(buf, tran->gray);
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
}
else if (color_type == PNG_COLOR_TYPE_RGB)
{
/* three 16 bit values */
png_save_uint_16(buf, tran->red);
png_save_uint_16(buf + 2, tran->green);
png_save_uint_16(buf + 4, tran->blue);
if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
}
else
{
png_warning(png_ptr, "Can't write tRNS with an alpha channel");
}
}
#endif
#if defined(PNG_WRITE_bKGD_SUPPORTED)
/* write the background chunk */
void /* PRIVATE */
png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_bKGD;
#endif
png_byte buf[6];
png_debug(1, "in png_write_bKGD\n");
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
if (
#if defined(PNG_MNG_FEATURES_SUPPORTED)
(png_ptr->num_palette ||
(!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
#endif
back->index > png_ptr->num_palette)
{
png_warning(png_ptr, "Invalid background palette index");
return;
}
buf[0] = back->index;
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
}
else if (color_type & PNG_COLOR_MASK_COLOR)
{
png_save_uint_16(buf, back->red);
png_save_uint_16(buf + 2, back->green);
png_save_uint_16(buf + 4, back->blue);
if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
}
else
{
if(back->gray >= (1 << png_ptr->bit_depth))
{
png_warning(png_ptr,
"Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
return;
}
png_save_uint_16(buf, back->gray);
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
}
}
#endif
#if defined(PNG_WRITE_hIST_SUPPORTED)
/* write the histogram */
void /* PRIVATE */
png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_hIST;
#endif
int i;
png_byte buf[3];
png_debug(1, "in png_write_hIST\n");
if (num_hist > (int)png_ptr->num_palette)
{
png_debug2(3, "num_hist = %d, num_palette = %d\n", num_hist,
png_ptr->num_palette);
png_warning(png_ptr, "Invalid number of histogram entries specified");
return;
}
png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2));
for (i = 0; i < num_hist; i++)
{
png_save_uint_16(buf, hist[i]);
png_write_chunk_data(png_ptr, buf, (png_size_t)2);
}
png_write_chunk_end(png_ptr);
}
#endif
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
* and if invalid, correct the keyword rather than discarding the entire
* chunk. The PNG 1.0 specification requires keywords 1-79 characters in
* length, forbids leading or trailing whitespace, multiple internal spaces,
* and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
*
* The new_key is allocated to hold the corrected keyword and must be freed
* by the calling routine. This avoids problems with trying to write to
* static keywords without having to have duplicate copies of the strings.
*/
png_size_t /* PRIVATE */
png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
{
png_size_t key_len;
png_charp kp, dp;
int kflag;
int kwarn=0;
png_debug(1, "in png_check_keyword\n");
*new_key = NULL;
if (key == NULL || (key_len = png_strlen(key)) == 0)
{
png_warning(png_ptr, "zero length keyword");
return ((png_size_t)0);
}
png_debug1(2, "Keyword to be checked is '%s'\n", key);
*new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 2));
/* Replace non-printing characters with a blank and print a warning */
for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
{
if (*kp < 0x20 || (*kp > 0x7E && (png_byte)*kp < 0xA1))
{
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[40];
sprintf(msg, "invalid keyword character 0x%02X", *kp);
png_warning(png_ptr, msg);
#else
png_warning(png_ptr, "invalid character in keyword");
#endif
*dp = ' ';
}
else
{
*dp = *kp;
}
}
*dp = '\0';
/* Remove any trailing white space. */
kp = *new_key + key_len - 1;
if (*kp == ' ')
{
png_warning(png_ptr, "trailing spaces removed from keyword");
while (*kp == ' ')
{
*(kp--) = '\0';
key_len--;
}
}
/* Remove any leading white space. */
kp = *new_key;
if (*kp == ' ')
{
png_warning(png_ptr, "leading spaces removed from keyword");
while (*kp == ' ')
{
kp++;
key_len--;
}
}
png_debug1(2, "Checking for multiple internal spaces in '%s'\n", kp);
/* Remove multiple internal spaces. */
for (kflag = 0, dp = *new_key; *kp != '\0'; kp++)
{
if (*kp == ' ' && kflag == 0)
{
*(dp++) = *kp;
kflag = 1;
}
else if (*kp == ' ')
{
key_len--;
kwarn=1;
}
else
{
*(dp++) = *kp;
kflag = 0;
}
}
*dp = '\0';
if(kwarn)
png_warning(png_ptr, "extra interior spaces removed from keyword");
if (key_len == 0)
{
png_free(png_ptr, *new_key);
*new_key=NULL;
png_warning(png_ptr, "Zero length keyword");
}
if (key_len > 79)
{
png_warning(png_ptr, "keyword length must be 1 - 79 characters");
new_key[79] = '\0';
key_len = 79;
}
return (key_len);
}
#endif
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write a tEXt chunk */
void /* PRIVATE */
png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_tEXt;
#endif
png_size_t key_len;
png_charp new_key;
png_debug(1, "in png_write_tEXt\n");
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in tEXt chunk");
return;
}
if (text == NULL || *text == '\0')
text_len = 0;
else
text_len = png_strlen(text);
/* make sure we include the 0 after the key */
png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
/*
* We leave it to the application to meet PNG-1.0 requirements on the
* contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
* any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
* The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
*/
png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
if (text_len)
png_write_chunk_data(png_ptr, (png_bytep)text, text_len);
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_key);
}
#endif
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write a compressed text chunk */
void /* PRIVATE */
png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len, int compression)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_zTXt;
#endif
png_size_t key_len;
char buf[1];
png_charp new_key;
compression_state comp;
png_debug(1, "in png_write_zTXt\n");
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in zTXt chunk");
return;
}
if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE)
{
png_write_tEXt(png_ptr, new_key, text, (png_size_t)0);
png_free(png_ptr, new_key);
return;
}
text_len = png_strlen(text);
png_free(png_ptr, new_key);
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression,
&comp);
/* write start of chunk */
png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, (png_uint_32)
(key_len+text_len+2));
/* write key */
png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
buf[0] = (png_byte)compression;
/* write compression */
png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
/* write the compressed data */
png_write_compressed_data_out(png_ptr, &comp);
/* close the chunk */
png_write_chunk_end(png_ptr);
}
#endif
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write an iTXt chunk */
void /* PRIVATE */
png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_charp lang, png_charp lang_key, png_charp text)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_iTXt;
#endif
png_size_t lang_len, key_len, lang_key_len, text_len;
png_charp new_lang, new_key;
png_byte cbuf[2];
compression_state comp;
png_debug(1, "in png_write_iTXt\n");
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in iTXt chunk");
return;
}
if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
{
png_warning(png_ptr, "Empty language field in iTXt chunk");
new_lang = NULL;
lang_len = 0;
}
if (lang_key == NULL)
lang_key_len = 0;
else
lang_key_len = png_strlen(lang_key);
if (text == NULL)
text_len = 0;
else
text_len = png_strlen(text);
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression-2,
&comp);
/* make sure we include the compression flag, the compression byte,
* and the NULs after the key, lang, and lang_key parts */
png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
(png_uint_32)(
5 /* comp byte, comp flag, terminators for key, lang and lang_key */
+ key_len
+ lang_len
+ lang_key_len
+ text_len));
/*
* We leave it to the application to meet PNG-1.0 requirements on the
* contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
* any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
* The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
*/
png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
/* set the compression flag */
if (compression == PNG_ITXT_COMPRESSION_NONE || \
compression == PNG_TEXT_COMPRESSION_NONE)
cbuf[0] = 0;
else /* compression == PNG_ITXT_COMPRESSION_zTXt */
cbuf[0] = 1;
/* set the compression method */
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, 2);
cbuf[0] = 0;
png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
png_write_compressed_data_out(png_ptr, &comp);
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_key);
if (new_lang)
png_free(png_ptr, new_lang);
}
#endif
#if defined(PNG_WRITE_oFFs_SUPPORTED)
/* write the oFFs chunk */
void /* PRIVATE */
png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
int unit_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_oFFs;
#endif
png_byte buf[9];
png_debug(1, "in png_write_oFFs\n");
if (unit_type >= PNG_OFFSET_LAST)
png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
png_save_int_32(buf, x_offset);
png_save_int_32(buf + 4, y_offset);
buf[8] = (png_byte)unit_type;
png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
}
#endif
#if defined(PNG_WRITE_pCAL_SUPPORTED)
/* write the pCAL chunk (described in the PNG extensions document) */
void /* PRIVATE */
png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_pCAL;
#endif
png_size_t purpose_len, units_len, total_len;
png_uint_32p params_len;
png_byte buf[10];
png_charp new_purpose;
int i;
png_debug1(1, "in png_write_pCAL (%d parameters)\n", nparams);
if (type >= PNG_EQUATION_LAST)
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1;
png_debug1(3, "pCAL purpose length = %d\n", (int)purpose_len);
units_len = png_strlen(units) + (nparams == 0 ? 0 : 1);
png_debug1(3, "pCAL units length = %d\n", (int)units_len);
total_len = purpose_len + units_len + 10;
params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
*sizeof(png_uint_32)));
/* Find the length of each parameter, making sure we don't count the
null terminator for the last parameter. */
for (i = 0; i < nparams; i++)
{
params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1);
png_debug2(3, "pCAL parameter %d length = %lu\n", i, params_len[i]);
total_len += (png_size_t)params_len[i];
}
png_debug1(3, "pCAL total length = %d\n", (int)total_len);
png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
png_save_int_32(buf, X0);
png_save_int_32(buf + 4, X1);
buf[8] = (png_byte)type;
buf[9] = (png_byte)nparams;
png_write_chunk_data(png_ptr, buf, (png_size_t)10);
png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len);
png_free(png_ptr, new_purpose);
for (i = 0; i < nparams; i++)
{
png_write_chunk_data(png_ptr, (png_bytep)params[i],
(png_size_t)params_len[i]);
}
png_free(png_ptr, params_len);
png_write_chunk_end(png_ptr);
}
#endif
#if defined(PNG_WRITE_sCAL_SUPPORTED)
/* write the sCAL chunk */
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
void /* PRIVATE */
png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
#endif
png_size_t total_len;
char wbuf[32], hbuf[32];
png_debug(1, "in png_write_sCAL\n");
#if defined(_WIN32_WCE)
/* sprintf() function is not supported on WindowsCE */
{
wchar_t wc_buf[32];
swprintf(wc_buf, TEXT("%12.12e"), width);
WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, wbuf, 32, NULL, NULL);
swprintf(wc_buf, TEXT("%12.12e"), height);
WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, hbuf, 32, NULL, NULL);
}
#else
sprintf(wbuf, "%12.12e", width);
sprintf(hbuf, "%12.12e", height);
#endif
total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
png_debug1(3, "sCAL total length = %d\n", (int)total_len);
png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
png_write_chunk_end(png_ptr);
}
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
void /* PRIVATE */
png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
png_charp height)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
#endif
png_size_t total_len;
char wbuf[32], hbuf[32];
png_debug(1, "in png_write_sCAL_s\n");
png_strcpy(wbuf,(const char *)width);
png_strcpy(hbuf,(const char *)height);
total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
png_debug1(3, "sCAL total length = %d\n", total_len);
png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
png_write_chunk_end(png_ptr);
}
#endif
#endif
#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
/* write the pHYs chunk */
void /* PRIVATE */
png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
png_uint_32 y_pixels_per_unit,
int unit_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_pHYs;
#endif
png_byte buf[9];
png_debug(1, "in png_write_pHYs\n");
if (unit_type >= PNG_RESOLUTION_LAST)
png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");
png_save_uint_32(buf, x_pixels_per_unit);
png_save_uint_32(buf + 4, y_pixels_per_unit);
buf[8] = (png_byte)unit_type;
png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
}
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* Write the tIME chunk. Use either png_convert_from_struct_tm()
* or png_convert_from_time_t(), or fill in the structure yourself.
*/
void /* PRIVATE */
png_write_tIME(png_structp png_ptr, png_timep mod_time)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_tIME;
#endif
png_byte buf[7];
png_debug(1, "in png_write_tIME\n");
if (mod_time->month > 12 || mod_time->month < 1 ||
mod_time->day > 31 || mod_time->day < 1 ||
mod_time->hour > 23 || mod_time->second > 60)
{
png_warning(png_ptr, "Invalid time specified for tIME chunk");
return;
}
png_save_uint_16(buf, mod_time->year);
buf[2] = mod_time->month;
buf[3] = mod_time->day;
buf[4] = mod_time->hour;
buf[5] = mod_time->minute;
buf[6] = mod_time->second;
png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
}
#endif
/* initializes the row writing capability of libpng */
void /* PRIVATE */
png_write_start_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
png_size_t buf_size;
png_debug(1, "in png_write_start_row\n");
buf_size = (png_size_t)(((png_ptr->width * png_ptr->usr_channels *
png_ptr->usr_bit_depth + 7) >> 3) + 1);
/* set up row buffer */
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
/* set up filtering buffer, if using this filter */
if (png_ptr->do_filter & PNG_FILTER_SUB)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
/* We only need to keep the previous row if we are using one of these. */
if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
{
/* set up previous row buffer */
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
png_memset(png_ptr->prev_row, 0, buf_size);
if (png_ptr->do_filter & PNG_FILTER_UP)
{
png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
if (png_ptr->do_filter & PNG_FILTER_AVG)
{
png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
}
if (png_ptr->do_filter & PNG_FILTER_PAETH)
{
png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
}
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* if interlaced, we need to set up width and height of pass */
if (png_ptr->interlaced)
{
if (!(png_ptr->transformations & PNG_INTERLACE))
{
png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
png_pass_ystart[0]) / png_pass_yinc[0];
png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 -
png_pass_start[0]) / png_pass_inc[0];
}
else
{
png_ptr->num_rows = png_ptr->height;
png_ptr->usr_width = png_ptr->width;
}
}
else
#endif
{
png_ptr->num_rows = png_ptr->height;
png_ptr->usr_width = png_ptr->width;
}
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_out = png_ptr->zbuf;
}
/* Internal use only. Called when finished processing a row of data. */
void /* PRIVATE */
png_write_finish_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
int ret;
png_debug(1, "in png_write_finish_row\n");
/* next row */
png_ptr->row_number++;
/* see if we are done */
if (png_ptr->row_number < png_ptr->num_rows)
return;
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* if interlaced, go to next pass */
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
if (png_ptr->transformations & PNG_INTERLACE)
{
png_ptr->pass++;
}
else
{
/* loop until we find a non-zero width or height pass */
do
{
png_ptr->pass++;
if (png_ptr->pass >= 7)
break;
png_ptr->usr_width = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
png_ptr->num_rows = (png_ptr->height +
png_pass_yinc[png_ptr->pass] - 1 -
png_pass_ystart[png_ptr->pass]) /
png_pass_yinc[png_ptr->pass];
if (png_ptr->transformations & PNG_INTERLACE)
break;
} while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0);
}
/* reset the row above the image for the next pass */
if (png_ptr->pass < 7)
{
if (png_ptr->prev_row != NULL)
png_memset(png_ptr->prev_row, 0,
(png_size_t) (((png_uint_32)png_ptr->usr_channels *
(png_uint_32)png_ptr->usr_bit_depth *
png_ptr->width + 7) >> 3) + 1);
return;
}
}
#endif
/* if we get here, we've just written the last row, so we need
to flush the compressor */
do
{
/* tell the compressor we are done */
ret = deflate(&png_ptr->zstream, Z_FINISH);
/* check for an error */
if (ret == Z_OK)
{
/* check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
}
}
else if (ret != Z_STREAM_END)
{
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
png_error(png_ptr, "zlib error");
}
} while (ret != Z_STREAM_END);
/* write any extra space */
if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
{
png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size -
png_ptr->zstream.avail_out);
}
deflateReset(&png_ptr->zstream);
}
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* Pick out the correct pixels for the interlace pass.
* The basic idea here is to go through the row with a source
* pointer and a destination pointer (sp and dp), and copy the
* correct pixels for the pass. As the row gets compacted,
* sp will always be >= dp, so we should never overwrite anything.
* See the default: case for the easiest code to understand.
*/
void /* PRIVATE */
png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
{
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
#endif
png_debug(1, "in png_do_write_interlace\n");
/* we don't have to do anything on the last pass (6) */
#if defined(PNG_USELESS_TESTS_SUPPORTED)
if (row != NULL && row_info != NULL && pass < 6)
#else
if (pass < 6)
#endif
{
/* each pixel depth is handled separately */
switch (row_info->pixel_depth)
{
case 1:
{
png_bytep sp;
png_bytep dp;
int shift;
int d;
int value;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
dp = row;
d = 0;
shift = 7;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 3);
value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
d |= (value << shift);
if (shift == 0)
{
shift = 7;
*dp++ = (png_byte)d;
d = 0;
}
else
shift--;
}
if (shift != 7)
*dp = (png_byte)d;
break;
}
case 2:
{
png_bytep sp;
png_bytep dp;
int shift;
int d;
int value;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
dp = row;
shift = 6;
d = 0;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 2);
value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
d |= (value << shift);
if (shift == 0)
{
shift = 6;
*dp++ = (png_byte)d;
d = 0;
}
else
shift -= 2;
}
if (shift != 6)
*dp = (png_byte)d;
break;
}
case 4:
{
png_bytep sp;
png_bytep dp;
int shift;
int d;
int value;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
dp = row;
shift = 4;
d = 0;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 1);
value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
d |= (value << shift);
if (shift == 0)
{
shift = 4;
*dp++ = (png_byte)d;
d = 0;
}
else
shift -= 4;
}
if (shift != 4)
*dp = (png_byte)d;
break;
}
default:
{
png_bytep sp;
png_bytep dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
png_size_t pixel_bytes;
/* start at the beginning */
dp = row;
/* find out how many bytes each pixel takes up */
pixel_bytes = (row_info->pixel_depth >> 3);
/* loop through the row, only looking at the pixels that
matter */
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
/* find out where the original pixel is */
sp = row + (png_size_t)i * pixel_bytes;
/* move the pixel */
if (dp != sp)
png_memcpy(dp, sp, pixel_bytes);
/* next pixel */
dp += pixel_bytes;
}
break;
}
}
/* set new row width */
row_info->width = (row_info->width +
png_pass_inc[pass] - 1 -
png_pass_start[pass]) /
png_pass_inc[pass];
row_info->rowbytes = ((row_info->width *
row_info->pixel_depth + 7) >> 3);
}
}
#endif
/* This filters the row, chooses which filter to use, if it has not already
* been specified by the application, and then writes the row out with the
* chosen filter.
*/
#define PNG_MAXSUM (~((png_uint_32)0) >> 1)
#define PNG_HISHIFT 10
#define PNG_LOMASK ((png_uint_32)0xffffL)
#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
void /* PRIVATE */
png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
{
png_bytep prev_row, best_row, row_buf;
png_uint_32 mins, bpp;
png_byte filter_to_do = png_ptr->do_filter;
png_uint_32 row_bytes = row_info->rowbytes;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
int num_p_filters = (int)png_ptr->num_prev_filters;
#endif
png_debug(1, "in png_write_find_filter\n");
/* find out how many bytes offset each pixel is */
bpp = (row_info->pixel_depth + 7) / 8;
prev_row = png_ptr->prev_row;
best_row = row_buf = png_ptr->row_buf;
mins = PNG_MAXSUM;
/* The prediction method we use is to find which method provides the
* smallest value when summing the absolute values of the distances
* from zero, using anything >= 128 as negative numbers. This is known
* as the "minimum sum of absolute differences" heuristic. Other
* heuristics are the "weighted minimum sum of absolute differences"
* (experimental and can in theory improve compression), and the "zlib
* predictive" method (not implemented yet), which does test compressions
* of lines using different filter methods, and then chooses the
* (series of) filter(s) that give minimum compressed data size (VERY
* computationally expensive).
*
* GRR 980525: consider also
* (1) minimum sum of absolute differences from running average (i.e.,
* keep running sum of non-absolute differences & count of bytes)
* [track dispersion, too? restart average if dispersion too large?]
* (1b) minimum sum of absolute differences from sliding average, probably
* with window size <= deflate window (usually 32K)
* (2) minimum sum of squared differences from zero or running average
* (i.e., ~ root-mean-square approach)
*/
/* We don't need to test the 'no filter' case if this is the only filter
* that has been chosen, as it doesn't actually do anything to the data.
*/
if ((filter_to_do & PNG_FILTER_NONE) &&
filter_to_do != PNG_FILTER_NONE)
{
png_bytep rp;
png_uint_32 sum = 0;
png_uint_32 i;
int v;
for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
{
v = *rp;
sum += (v < 128) ? v : 256 - v;
}
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
png_uint_32 sumhi, sumlo;
int j;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
/* Reduce the sum if we match any of the previous rows */
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
{
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
/* Factor in the cost of this filter (this is here for completeness,
* but it makes no sense to have a "cost" for the NONE filter, as
* it has the minimum possible computational cost - none).
*/
sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>
PNG_COST_SHIFT;
sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>
PNG_COST_SHIFT;
if (sumhi > PNG_HIMASK)
sum = PNG_MAXSUM;
else
sum = (sumhi << PNG_HISHIFT) + sumlo;
}
#endif
mins = sum;
}
/* sub filter */
if (filter_to_do == PNG_FILTER_SUB)
/* it's the only filter so no testing is needed */
{
png_bytep rp, lp, dp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
i++, rp++, dp++)
{
*dp = *rp;
}
for (lp = row_buf + 1; i < row_bytes;
i++, rp++, lp++, dp++)
{
*dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
}
best_row = png_ptr->sub_row;
}
else if (filter_to_do & PNG_FILTER_SUB)
{
png_bytep rp, dp, lp;
png_uint_32 sum = 0, lmins = mins;
png_uint_32 i;
int v;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
/* We temporarily increase the "minimum sum" by the factor we
* would reduce the sum of this filter, so that we can do the
* early exit comparison without scaling the sum each time.
*/
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
PNG_COST_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
PNG_COST_SHIFT;
if (lmhi > PNG_HIMASK)
lmins = PNG_MAXSUM;
else
lmins = (lmhi << PNG_HISHIFT) + lmlo;
}
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
i++, rp++, dp++)
{
v = *dp = *rp;
sum += (v < 128) ? v : 256 - v;
}
for (lp = row_buf + 1; i < row_info->rowbytes;
i++, rp++, lp++, dp++)
{
v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
sum += (v < 128) ? v : 256 - v;
if (sum > lmins) /* We are already worse, don't continue. */
break;
}
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
{
sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
PNG_COST_SHIFT;
sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
PNG_COST_SHIFT;
if (sumhi > PNG_HIMASK)
sum = PNG_MAXSUM;
else
sum = (sumhi << PNG_HISHIFT) + sumlo;
}
#endif
if (sum < mins)
{
mins = sum;
best_row = png_ptr->sub_row;
}
}
/* up filter */
if (filter_to_do == PNG_FILTER_UP)
{
png_bytep rp, dp, pp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
pp = prev_row + 1; i < row_bytes;
i++, rp++, pp++, dp++)
{
*dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
}
best_row = png_ptr->up_row;
}
else if (filter_to_do & PNG_FILTER_UP)
{
png_bytep rp, dp, pp;
png_uint_32 sum = 0, lmins = mins;
png_uint_32 i;
int v;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>
PNG_COST_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>
PNG_COST_SHIFT;
if (lmhi > PNG_HIMASK)
lmins = PNG_MAXSUM;
else
lmins = (lmhi << PNG_HISHIFT) + lmlo;
}
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
pp = prev_row + 1; i < row_bytes; i++)
{
v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
sum += (v < 128) ? v : 256 - v;
if (sum > lmins) /* We are already worse, don't continue. */
break;
}
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
{
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>
PNG_COST_SHIFT;
sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>
PNG_COST_SHIFT;
if (sumhi > PNG_HIMASK)
sum = PNG_MAXSUM;
else
sum = (sumhi << PNG_HISHIFT) + sumlo;
}
#endif
if (sum < mins)
{
mins = sum;
best_row = png_ptr->up_row;
}
}
/* avg filter */
if (filter_to_do == PNG_FILTER_AVG)
{
png_bytep rp, dp, pp, lp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
pp = prev_row + 1; i < bpp; i++)
{
*dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
}
for (lp = row_buf + 1; i < row_bytes; i++)
{
*dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
& 0xff);
}
best_row = png_ptr->avg_row;
}
else if (filter_to_do & PNG_FILTER_AVG)
{
png_bytep rp, dp, pp, lp;
png_uint_32 sum = 0, lmins = mins;
png_uint_32 i;
int v;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>
PNG_COST_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>
PNG_COST_SHIFT;
if (lmhi > PNG_HIMASK)
lmins = PNG_MAXSUM;
else
lmins = (lmhi << PNG_HISHIFT) + lmlo;
}
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
pp = prev_row + 1; i < bpp; i++)
{
v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
sum += (v < 128) ? v : 256 - v;
}
for (lp = row_buf + 1; i < row_bytes; i++)
{
v = *dp++ =
(png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff);
sum += (v < 128) ? v : 256 - v;
if (sum > lmins) /* We are already worse, don't continue. */
break;
}
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
{
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>
PNG_COST_SHIFT;
sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>
PNG_COST_SHIFT;
if (sumhi > PNG_HIMASK)
sum = PNG_MAXSUM;
else
sum = (sumhi << PNG_HISHIFT) + sumlo;
}
#endif
if (sum < mins)
{
mins = sum;
best_row = png_ptr->avg_row;
}
}
/* Paeth filter */
if (filter_to_do == PNG_FILTER_PAETH)
{
png_bytep rp, dp, pp, cp, lp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
pp = prev_row + 1; i < bpp; i++)
{
*dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
}
for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
{
int a, b, c, pa, pb, pc, p;
b = *pp++;
c = *cp++;
a = *lp++;
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
*dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
}
best_row = png_ptr->paeth_row;
}
else if (filter_to_do & PNG_FILTER_PAETH)
{
png_bytep rp, dp, pp, cp, lp;
png_uint_32 sum = 0, lmins = mins;
png_uint_32 i;
int v;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>
PNG_COST_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>
PNG_COST_SHIFT;
if (lmhi > PNG_HIMASK)
lmins = PNG_MAXSUM;
else
lmins = (lmhi << PNG_HISHIFT) + lmlo;
}
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
pp = prev_row + 1; i < bpp; i++)
{
v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
sum += (v < 128) ? v : 256 - v;
}
for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
{
int a, b, c, pa, pb, pc, p;
b = *pp++;
c = *cp++;
a = *lp++;
#ifndef PNG_SLOW_PAETH
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
#else /* PNG_SLOW_PAETH */
p = a + b - c;
pa = abs(p - a);
pb = abs(p - b);
pc = abs(p - c);
if (pa <= pb && pa <= pc)
p = a;
else if (pb <= pc)
p = b;
else
p = c;
#endif /* PNG_SLOW_PAETH */
v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
sum += (v < 128) ? v : 256 - v;
if (sum > lmins) /* We are already worse, don't continue. */
break;
}
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
{
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>
PNG_COST_SHIFT;
sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>
PNG_COST_SHIFT;
if (sumhi > PNG_HIMASK)
sum = PNG_MAXSUM;
else
sum = (sumhi << PNG_HISHIFT) + sumlo;
}
#endif
if (sum < mins)
{
best_row = png_ptr->paeth_row;
}
}
/* Do the actual writing of the filtered row data from the chosen filter. */
png_write_filtered_row(png_ptr, best_row);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
/* Save the type of filter we picked this time for future calculations */
if (png_ptr->num_prev_filters > 0)
{
int j;
for (j = 1; j < num_p_filters; j++)
{
png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1];
}
png_ptr->prev_filters[j] = best_row[0];
}
#endif
}
/* Do the actual writing of a previously filtered row. */
void /* PRIVATE */
png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
{
png_debug(1, "in png_write_filtered_row\n");
png_debug1(2, "filter = %d\n", filtered_row[0]);
/* set up the zlib input buffer */
png_ptr->zstream.next_in = filtered_row;
png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1;
/* repeat until we have compressed all the data */
do
{
int ret; /* return of zlib */
/* compress the data */
ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
/* check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
png_error(png_ptr, "zlib error");
}
/* see if it is time to write another IDAT */
if (!(png_ptr->zstream.avail_out))
{
/* write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
}
/* repeat until all data has been compressed */
} while (png_ptr->zstream.avail_in);
/* swap the current and previous rows */
if (png_ptr->prev_row != NULL)
{
png_bytep tptr;
tptr = png_ptr->prev_row;
png_ptr->prev_row = png_ptr->row_buf;
png_ptr->row_buf = tptr;
}
/* finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr);
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
png_ptr->flush_rows++;
if (png_ptr->flush_dist > 0 &&
png_ptr->flush_rows >= png_ptr->flush_dist)
{
png_write_flush(png_ptr);
}
#endif
}
#endif /* PNG_WRITE_SUPPORTED */
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