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vlc-2-2
Commit a9292296 authored by Jean-Baptiste Kempf's avatar Jean-Baptiste Kempf
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MP4: cleanup 

improve locality, remove memset and useless labels, add unlikely post
allocations
parent ef466bbd
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Showing with 47 additions and 87 deletions
modules/demux/mp4/libmp4.c
View file @ a9292296
......@@ -25,7 +25,7 @@
#endif
#include <vlc_common.h>
#include <vlc_demux.h>
#include <vlc_stream.h> /* stream_Peek*/
#ifdef HAVE_ZLIB_H
# include <zlib.h> /* for compressed moov */
......@@ -117,8 +117,7 @@ static inline size_t mp4_box_headersize( MP4_Box_t *p_box )
/* Some assumptions:
* The input method HAS to be seekable
*/
*/
/* This macro is used when we want to printf the box type
* APPLE annotation box is :
......@@ -127,12 +126,12 @@ static inline size_t mp4_box_headersize( MP4_Box_t *p_box )
*/
#define MP4_BOX_TYPE_ASCII() ( ((char*)&p_box->i_type)[0] != (char)0xA9 )
static uint32_t Get24bBE( const uint8_t *p )
static inline uint32_t Get24bBE( const uint8_t *p )
{
return( ( p[0] <<16 ) + ( p[1] <<8 ) + p[2] );
}
static void GetUUID( UUID_t *p_uuid, const uint8_t *p_buff )
static inline void GetUUID( UUID_t *p_uuid, const uint8_t *p_buff )
{
memcpy( p_uuid, p_buff, 16 );
}
......@@ -380,15 +379,14 @@ static int MP4_ReadBox_ftyp( stream_t *p_stream, MP4_Box_t *p_box )
if( ( p_box->data.p_ftyp->i_compatible_brands_count = i_read / 4 ) )
{
unsigned int i;
uint32_t *tab = p_box->data.p_ftyp->i_compatible_brands =
calloc( p_box->data.p_ftyp->i_compatible_brands_count,
sizeof(uint32_t));
if( tab == NULL )
if( unlikely( tab == NULL ) )
MP4_READBOX_EXIT( 0 );
for( i =0; i < p_box->data.p_ftyp->i_compatible_brands_count; i++ )
for( unsigned i = 0; i < p_box->data.p_ftyp->i_compatible_brands_count; i++ )
{
MP4_GETFOURCC( tab[i] );
}
......@@ -409,7 +407,6 @@ static void MP4_FreeBox_ftyp( MP4_Box_t *p_box )
static int MP4_ReadBox_mvhd( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
#ifdef MP4_VERBOSE
char s_creation_time[128];
char s_modification_time[128];
......@@ -438,15 +435,15 @@ static int MP4_ReadBox_mvhd( stream_t *p_stream, MP4_Box_t *p_box )
MP4_GET2BYTES( p_box->data.p_mvhd->i_reserved1 );
for( i = 0; i < 2; i++ )
for( unsigned i = 0; i < 2; i++ )
{
MP4_GET4BYTES( p_box->data.p_mvhd->i_reserved2[i] );
}
for( i = 0; i < 9; i++ )
for( unsigned i = 0; i < 9; i++ )
{
MP4_GET4BYTES( p_box->data.p_mvhd->i_matrix[i] );
}
for( i = 0; i < 6; i++ )
for( unsigned i = 0; i < 6; i++ )
{
MP4_GET4BYTES( p_box->data.p_mvhd->i_predefined[i] );
}
......@@ -596,10 +593,8 @@ static void MP4_FreeBox_trun( MP4_Box_t *p_box )
}
static int MP4_ReadBox_tkhd( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
#ifdef MP4_VERBOSE
char s_creation_time[128];
char s_modification_time[128];
......@@ -626,7 +621,7 @@ static int MP4_ReadBox_tkhd( stream_t *p_stream, MP4_Box_t *p_box )
MP4_GET4BYTES( p_box->data.p_tkhd->i_duration );
}
for( i = 0; i < 2; i++ )
for( unsigned i = 0; i < 2; i++ )
{
MP4_GET4BYTES( p_box->data.p_tkhd->i_reserved2[i] );
}
......@@ -635,7 +630,7 @@ static int MP4_ReadBox_tkhd( stream_t *p_stream, MP4_Box_t *p_box )
MP4_GET2BYTES( p_box->data.p_tkhd->i_volume );
MP4_GET2BYTES( p_box->data.p_tkhd->i_reserved3 );
for( i = 0; i < 9; i++ )
for( unsigned i = 0; i < 9; i++ )
{
MP4_GET4BYTES( p_box->data.p_tkhd->i_matrix[i] );
}
......@@ -663,7 +658,6 @@ static int MP4_ReadBox_tkhd( stream_t *p_stream, MP4_Box_t *p_box )
static int MP4_ReadBox_mdhd( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
uint16_t i_language;
#ifdef MP4_VERBOSE
char s_creation_time[128];
......@@ -689,7 +683,7 @@ static int MP4_ReadBox_mdhd( stream_t *p_stream, MP4_Box_t *p_box )
MP4_GET4BYTES( p_box->data.p_mdhd->i_duration );
}
p_box->data.p_mdhd->i_language_code = i_language = GetWBE( p_peek );
for( i = 0; i < 3; i++ )
for( unsigned i = 0; i < 3; i++ )
{
p_box->data.p_mdhd->i_language[i] =
( ( i_language >> ( (2-i)*5 ) )&0x1f ) + 0x60;
......@@ -733,7 +727,7 @@ static int MP4_ReadBox_hdlr( stream_t *p_stream, MP4_Box_t *p_box )
if( i_read > 0 )
{
uint8_t *psz = p_box->data.p_hdlr->psz_name = malloc( i_read + 1 );
if( psz == NULL )
if( unlikely( psz == NULL ) )
MP4_READBOX_EXIT( 0 );
/* Yes, I love .mp4 :( */
......@@ -771,14 +765,12 @@ static void MP4_FreeBox_hdlr( MP4_Box_t *p_box )
static int MP4_ReadBox_vmhd( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_vmhd_t );
MP4_GETVERSIONFLAGS( p_box->data.p_vmhd );
MP4_GET2BYTES( p_box->data.p_vmhd->i_graphics_mode );
for( i = 0; i < 3; i++ )
for( unsigned i = 0; i < 3; i++ )
{
MP4_GET2BYTES( p_box->data.p_vmhd->i_opcolor[i] );
}
......@@ -908,7 +900,6 @@ static void MP4_FreeBox_stts( MP4_Box_t *p_box )
static int MP4_ReadBox_stts( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_stts_t );
MP4_GETVERSIONFLAGS( p_box->data.p_stts );
......@@ -924,7 +915,7 @@ static int MP4_ReadBox_stts( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 0 );
}
for( i = 0; (i < p_box->data.p_stts->i_entry_count )&&( i_read >=8 ); i++ )
for( unsigned int i = 0; (i < p_box->data.p_stts->i_entry_count )&&( i_read >=8 ); i++ )
{
MP4_GET4BYTES( p_box->data.p_stts->i_sample_count[i] );
MP4_GET4BYTES( p_box->data.p_stts->i_sample_delta[i] );
......@@ -947,7 +938,6 @@ static void MP4_FreeBox_ctts( MP4_Box_t *p_box )
static int MP4_ReadBox_ctts( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_ctts_t );
MP4_GETVERSIONFLAGS( p_box->data.p_ctts );
......@@ -964,7 +954,7 @@ static int MP4_ReadBox_ctts( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 0 );
}
for( i = 0; (i < p_box->data.p_ctts->i_entry_count )&&( i_read >=8 ); i++ )
for( unsigned int i = 0; (i < p_box->data.p_ctts->i_entry_count )&&( i_read >=8 ); i++ )
{
MP4_GET4BYTES( p_box->data.p_ctts->i_sample_count[i] );
MP4_GET4BYTES( p_box->data.p_ctts->i_sample_offset[i] );
......@@ -1078,7 +1068,7 @@ static int MP4_ReadBox_esds( stream_t *p_stream, MP4_Box_t *p_box )
es_descriptor.p_decConfigDescr =
calloc( 1, sizeof( MP4_descriptor_decoder_config_t ));
if( es_descriptor.p_decConfigDescr == NULL )
if( unlikely( es_descriptor.p_decConfigDescr == NULL ) )
MP4_READBOX_EXIT( 0 );
MP4_GET1BYTE( es_descriptor.p_decConfigDescr->i_objectTypeIndication );
......@@ -1107,7 +1097,7 @@ static int MP4_ReadBox_esds( stream_t *p_stream, MP4_Box_t *p_box )
es_descriptor.p_decConfigDescr->i_decoder_specific_info_len = i_len;
es_descriptor.p_decConfigDescr->p_decoder_specific_info = malloc( i_len );
if( es_descriptor.p_decConfigDescr->p_decoder_specific_info == NULL )
if( unlikely( es_descriptor.p_decConfigDescr->p_decoder_specific_info == NULL ) )
MP4_READBOX_EXIT( 0 );
memcpy( es_descriptor.p_decConfigDescr->p_decoder_specific_info,
......@@ -1339,8 +1329,6 @@ static int MP4_ReadBox_trkn( stream_t *p_stream, MP4_Box_t *p_box )
static int MP4_ReadBox_sample_soun( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_sample_soun_t );
p_box->data.p_sample_soun->p_qt_description = NULL;
......@@ -1352,7 +1340,7 @@ static int MP4_ReadBox_sample_soun( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 1 );
}
for( i = 0; i < 6 ; i++ )
for( unsigned i = 0; i < 6 ; i++ )
{
MP4_GET1BYTE( p_box->data.p_sample_soun->i_reserved1[i] );
}
......@@ -1492,11 +1480,9 @@ static void MP4_FreeBox_sample_soun( MP4_Box_t *p_box )
int MP4_ReadBox_sample_vide( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_sample_vide_t );
for( i = 0; i < 6 ; i++ )
for( unsigned i = 0; i < 6 ; i++ )
{
MP4_GET1BYTE( p_box->data.p_sample_vide->i_reserved1[i] );
}
......@@ -1509,7 +1495,7 @@ int MP4_ReadBox_sample_vide( stream_t *p_stream, MP4_Box_t *p_box )
if( i_read > 0 )
{
p_box->data.p_sample_vide->p_qt_image_description = malloc( i_read );
if( p_box->data.p_sample_vide->p_qt_image_description == NULL )
if( unlikely( p_box->data.p_sample_vide->p_qt_image_description == NULL ) )
MP4_READBOX_EXIT( 0 );
p_box->data.p_sample_vide->i_qt_image_description = i_read;
memcpy( p_box->data.p_sample_vide->p_qt_image_description,
......@@ -1750,8 +1736,6 @@ static void MP4_FreeBox_stsc( MP4_Box_t *p_box )
static int MP4_ReadBox_stsc( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_stsc_t );
MP4_GETVERSIONFLAGS( p_box->data.p_stsc );
......@@ -1764,14 +1748,14 @@ static int MP4_ReadBox_stsc( stream_t *p_stream, MP4_Box_t *p_box )
calloc( p_box->data.p_stsc->i_entry_count, sizeof(uint32_t) );
p_box->data.p_stsc->i_sample_description_index =
calloc( p_box->data.p_stsc->i_entry_count, sizeof(uint32_t) );
if( p_box->data.p_stsc->i_first_chunk == NULL
if( unlikely( p_box->data.p_stsc->i_first_chunk == NULL
|| p_box->data.p_stsc->i_samples_per_chunk == NULL
|| p_box->data.p_stsc->i_sample_description_index == NULL )
|| p_box->data.p_stsc->i_sample_description_index == NULL ) )
{
MP4_READBOX_EXIT( 0 );
}
for( i = 0; (i < p_box->data.p_stsc->i_entry_count )&&( i_read >= 12 );i++ )
for( unsigned int i = 0; (i < p_box->data.p_stsc->i_entry_count )&&( i_read >= 12 );i++ )
{
MP4_GET4BYTES( p_box->data.p_stsc->i_first_chunk[i] );
MP4_GET4BYTES( p_box->data.p_stsc->i_samples_per_chunk[i] );
......@@ -1788,8 +1772,6 @@ static int MP4_ReadBox_stsc( stream_t *p_stream, MP4_Box_t *p_box )
static int MP4_ReadBox_stco_co64( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_co64_t );
MP4_GETVERSIONFLAGS( p_box->data.p_co64 );
......@@ -1801,7 +1783,7 @@ static int MP4_ReadBox_stco_co64( stream_t *p_stream, MP4_Box_t *p_box )
if( p_box->data.p_co64->i_chunk_offset == NULL )
MP4_READBOX_EXIT( 0 );
for( i = 0; i < p_box->data.p_co64->i_entry_count; i++ )
for( unsigned int i = 0; i < p_box->data.p_co64->i_entry_count; i++ )
{
if( p_box->i_type == ATOM_stco )
{
......@@ -1836,8 +1818,6 @@ static void MP4_FreeBox_stco_co64( MP4_Box_t *p_box )
static int MP4_ReadBox_stss( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_stss_t );
MP4_GETVERSIONFLAGS( p_box->data.p_stss );
......@@ -1846,10 +1826,10 @@ static int MP4_ReadBox_stss( stream_t *p_stream, MP4_Box_t *p_box )
p_box->data.p_stss->i_sample_number =
calloc( p_box->data.p_stss->i_entry_count, sizeof(uint32_t) );
if( p_box->data.p_stss->i_sample_number == NULL )
if( unlikely( p_box->data.p_stss->i_sample_number == NULL ) )
MP4_READBOX_EXIT( 0 );
for( i = 0; (i < p_box->data.p_stss->i_entry_count )&&( i_read >= 4 ); i++ )
for( unsigned int i = 0; (i < p_box->data.p_stss->i_entry_count )&&( i_read >= 4 ); i++ )
{
MP4_GET4BYTES( p_box->data.p_stss->i_sample_number[i] );
......@@ -1878,8 +1858,6 @@ static void MP4_FreeBox_stsh( MP4_Box_t *p_box )
static int MP4_ReadBox_stsh( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_stsh_t );
MP4_GETVERSIONFLAGS( p_box->data.p_stsh );
......@@ -1898,9 +1876,8 @@ static int MP4_ReadBox_stsh( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 0 );
}
for( i = 0; (i < p_box->data.p_stss->i_entry_count )&&( i_read >= 8 ); i++ )
for( unsigned i = 0; (i < p_box->data.p_stss->i_entry_count )&&( i_read >= 8 ); i++ )
{
MP4_GET4BYTES( p_box->data.p_stsh->i_shadowed_sample_number[i] );
MP4_GET4BYTES( p_box->data.p_stsh->i_sync_sample_number[i] );
}
......@@ -1915,8 +1892,6 @@ static int MP4_ReadBox_stsh( stream_t *p_stream, MP4_Box_t *p_box )
static int MP4_ReadBox_stdp( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_stdp_t );
MP4_GETVERSIONFLAGS( p_box->data.p_stdp );
......@@ -1924,9 +1899,11 @@ static int MP4_ReadBox_stdp( stream_t *p_stream, MP4_Box_t *p_box )
p_box->data.p_stdp->i_priority =
calloc( i_read / 2, sizeof(uint16_t) );
for( i = 0; i < i_read / 2 ; i++ )
{
if( unlikely( !p_box->data.p_stdp->i_priority ) )
MP4_READBOX_EXIT( 0 );
for( unsigned i = 0; i < i_read / 2 ; i++ )
{
MP4_GET2BYTES( p_box->data.p_stdp->i_priority[i] );
}
......@@ -1953,7 +1930,6 @@ static void MP4_FreeBox_padb( MP4_Box_t *p_box )
static int MP4_ReadBox_padb( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
uint32_t count;
MP4_READBOX_ENTER( MP4_Box_data_padb_t );
......@@ -1975,7 +1951,7 @@ static int MP4_ReadBox_padb( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 0 );
}
for( i = 0; i < i_read / 2 ; i++ )
for( unsigned int i = 0; i < i_read / 2 ; i++ )
{
if( i >= count )
{
......@@ -2007,8 +1983,6 @@ static void MP4_FreeBox_elst( MP4_Box_t *p_box )
static int MP4_ReadBox_elst( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_elst_t );
MP4_GETVERSIONFLAGS( p_box->data.p_elst );
......@@ -2033,7 +2007,7 @@ static int MP4_ReadBox_elst( stream_t *p_stream, MP4_Box_t *p_box )
}
for( i = 0; i < p_box->data.p_elst->i_entry_count; i++ )
for( unsigned i = 0; i < p_box->data.p_elst->i_entry_count; i++ )
{
if( p_box->data.p_elst->i_version == 1 )
{
......@@ -2065,14 +2039,13 @@ static int MP4_ReadBox_elst( stream_t *p_stream, MP4_Box_t *p_box )
static int MP4_ReadBox_cprt( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i_language;
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_cprt_t );
MP4_GETVERSIONFLAGS( p_box->data.p_cprt );
i_language = GetWBE( p_peek );
for( i = 0; i < 3; i++ )
for( unsigned i = 0; i < 3; i++ )
{
p_box->data.p_cprt->i_language[i] =
( ( i_language >> ( (2-i)*5 ) )&0x1f ) + 0x60;
......@@ -2119,12 +2092,10 @@ static int MP4_ReadBox_cmvd( stream_t *p_stream, MP4_Box_t *p_box )
p_box->data.p_cmvd->i_compressed_size = i_read;
if( !( p_box->data.p_cmvd->p_data = malloc( i_read ) ) )
return( 1 );
MP4_READBOX_EXIT( 0 );
/* now copy compressed data */
memcpy( p_box->data.p_cmvd->p_data,
p_peek,
i_read);
memcpy( p_box->data.p_cmvd->p_data, p_peek,i_read);
p_box->data.p_cmvd->b_compressed = 1;
......@@ -2153,9 +2124,8 @@ static int MP4_ReadBox_cmov( stream_t *p_stream, MP4_Box_t *p_box )
int i_result;
#endif
if( !( p_box->data.p_cmov = malloc( sizeof( MP4_Box_data_cmov_t ) ) ) )
if( !( p_box->data.p_cmov = calloc(1, sizeof( MP4_Box_data_cmov_t ) ) ) )
return 0;
memset( p_box->data.p_cmov, 0, sizeof( MP4_Box_data_cmov_t ) );
if( !p_box->p_father ||
( p_box->p_father->i_type != ATOM_moov &&
......@@ -2270,13 +2240,12 @@ static int MP4_ReadBox_rdrf( stream_t *p_stream, MP4_Box_t *p_box )
if( i_len > 0 )
{
uint32_t i;
p_box->data.p_rdrf->psz_ref = malloc( i_len );
if( p_box->data.p_rdrf->psz_ref == NULL )
MP4_READBOX_EXIT( 0 );
i_len--;
for( i = 0; i < i_len; i++ )
for( unsigned i = 0; i < i_len; i++ )
{
MP4_GET1BYTE( p_box->data.p_rdrf->psz_ref[i] );
}
......@@ -2550,8 +2519,7 @@ static void MP4_FreeBox_0xa9xxx( MP4_Box_t *p_box )
static void MP4_FreeBox_chpl( MP4_Box_t *p_box )
{
MP4_Box_data_chpl_t *p_chpl = p_box->data.p_chpl;
int i;
for( i = 0; i < p_chpl->i_chapter; i++ )
for( unsigned i = 0; i < p_chpl->i_chapter; i++ )
free( p_chpl->chapter[i].psz_name );
}
......@@ -2580,7 +2548,7 @@ static int MP4_ReadBox_chpl( stream_t *p_stream, MP4_Box_t *p_box )
p_chpl->chapter[i].psz_name = malloc( i_len + 1 );
if( !p_chpl->chapter[i].psz_name )
goto error;
MP4_READBOX_EXIT( 0 );
i_copy = __MIN( i_len, i_read );
if( i_copy > 0 )
......@@ -2618,14 +2586,10 @@ static int MP4_ReadBox_chpl( stream_t *p_stream, MP4_Box_t *p_box )
p_chpl->i_chapter );
#endif
MP4_READBOX_EXIT( 1 );
error:
MP4_READBOX_EXIT( 0 );
}
static int MP4_ReadBox_tref_generic( stream_t *p_stream, MP4_Box_t *p_box )
{
unsigned int i;
MP4_READBOX_ENTER( MP4_Box_data_tref_generic_t );
p_box->data.p_tref_generic->i_track_ID = NULL;
......@@ -2635,7 +2599,7 @@ static int MP4_ReadBox_tref_generic( stream_t *p_stream, MP4_Box_t *p_box )
if( p_box->data.p_tref_generic->i_track_ID == NULL )
MP4_READBOX_EXIT( 0 );
for( i = 0; i < p_box->data.p_tref_generic->i_entry_count; i++ )
for( unsigned i = 0; i < p_box->data.p_tref_generic->i_entry_count; i++ )
{
MP4_GET4BYTES( p_box->data.p_tref_generic->i_track_ID[i] );
}
......@@ -2770,9 +2734,9 @@ static int MP4_ReadBox_sdtp( stream_t *p_stream, MP4_Box_t *p_box )
p_sdtp->p_sample_table = calloc( i_sample_count, 1 );
if( !p_sdtp->p_sample_table )
goto error;
MP4_READBOX_EXIT( 0 );
for( uint32_t i=0; i < i_sample_count; i++ )
for( uint32_t i = 0; i < i_sample_count; i++ )
MP4_GET1BYTE( p_sdtp->p_sample_table[i] );
#ifdef MP4_VERBOSE
......@@ -2786,8 +2750,6 @@ static int MP4_ReadBox_sdtp( stream_t *p_stream, MP4_Box_t *p_box )
#endif
MP4_READBOX_EXIT( 1 );
error:
MP4_READBOX_EXIT( 0 );
}
static void MP4_FreeBox_sdtp( MP4_Box_t *p_box )
......@@ -2842,7 +2804,7 @@ static int MP4_ReadBox_tfra( stream_t *p_stream, MP4_Box_t *p_box )
|| !p_tfra->p_trun_number || !p_tfra->p_sample_number )
goto error;
for( uint32_t i=0; i < i_number_of_entries; i++ )
for( uint32_t i = 0; i < i_number_of_entries; i++ )
{
if( p_tfra->i_version == 1 )
{
......@@ -3403,14 +3365,12 @@ static void MP4_BoxDumpStructure_Internal( stream_t *s,
}
else
{
unsigned int i;
char str[512];
if( i_level >= (sizeof(str) - 1)/4 )
return;
memset( str, ' ', sizeof(str) );
for( i = 0; i < i_level; i++ )
for( unsigned i = 0; i < i_level; i++ )
{
str[i*4] = '|';
}
......
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