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videolan
vlc-2-2
Commits
1c0f708a
Commit
1c0f708a
authored
Feb 20, 2008
by
Rémi Denis-Courmont
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Plain Diff
Remove old mmap support
parent
160ee0af
Changes
1
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1 changed file
with
4 additions
and
147 deletions
+4
-147
modules/access/file.c
modules/access/file.c
+4
-147
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modules/access/file.c
View file @
1c0f708a
...
...
@@ -53,9 +53,6 @@
# include <unistd.h>
# include <poll.h>
#endif
#ifdef HAVE_MMAP
# include <sys/mman.h>
#endif
#if defined( WIN32 ) && !defined( UNDER_CE )
# ifdef lseek
...
...
@@ -108,15 +105,11 @@ vlc_module_end();
static
int
Seek
(
access_t
*
,
int64_t
);
static
ssize_t
Read
(
access_t
*
,
uint8_t
*
,
size_t
);
static
int
Control
(
access_t
*
,
int
,
va_list
);
#ifdef HAVE_MMAP
static
block_t
*
mmapBlock
(
access_t
*
);
#endif
static
int
open_file
(
access_t
*
,
const
char
*
);
struct
access_sys_t
{
uint64_t
pagemask
;
unsigned
int
i_nb_reads
;
vlc_bool_t
b_kfir
;
...
...
@@ -198,51 +191,15 @@ static int Open( vlc_object_t *p_this )
#ifdef HAVE_SYS_STAT_H
p_access
->
info
.
i_size
=
st
.
st_size
;
if
(
!
S_ISREG
(
st
.
st_mode
)
&&
!
S_ISBLK
(
st
.
st_mode
)
&&
(
!
S_ISCHR
(
st
.
st_mode
)
||
(
st
.
st_size
==
0
)))
if
(
!
S_ISREG
(
st
.
st_mode
)
&&
!
S_ISBLK
(
st
.
st_mode
)
&&
!
S_ISCHR
(
st
.
st_mode
))
p_sys
->
b_seekable
=
VLC_FALSE
;
# ifdef HAVE_MMAP
p_sys
->
pagemask
=
sysconf
(
_SC_PAGE_SIZE
)
-
1
;
/* Autodetect mmap() support */
if
(
p_sys
->
b_pace_control
&&
S_ISREG
(
st
.
st_mode
)
&&
(
st
.
st_size
>
0
))
{
/* TODO: Do not allow PROT_WRITE, we should not need it.
* However, this far, "block" ownership seems such that whoever
* "receives" a block can freely modify its content. Hence we _may_
* need PROT_WRITE not to default memory protection.
* NOTE: With MAP_PRIVATE, changes are not committed to the underlying
* file, write open permission is not required.
*/
void
*
addr
=
mmap
(
NULL
,
1
,
PROT_READ
|
PROT_WRITE
,
MAP_PRIVATE
,
fd
,
0
);
if
(
addr
!=
MAP_FAILED
)
{
/* Does the file system support mmap? */
munmap
(
addr
,
1
);
p_access
->
pf_read
=
NULL
;
p_access
->
pf_block
=
mmapBlock
;
msg_Dbg
(
p_this
,
"mmap enabled"
);
}
else
msg_Dbg
(
p_this
,
"mmap disabled (%m)"
);
}
else
msg_Dbg
(
p_this
,
"mmap disabled (non regular file)"
);
# endif
#else
p_sys
->
b_seekable
=
!
b_stdin
;
# warning File size not known!
#endif
if
(
p_sys
->
b_seekable
&&
(
p_access
->
info
.
i_size
==
0
))
{
/* FIXME that's bad because all others access will be probed */
msg_Err
(
p_access
,
"file is empty, aborting"
);
Close
(
p_this
);
return
VLC_EGENERIC
;
}
return
VLC_SUCCESS
;
}
...
...
@@ -349,116 +306,16 @@ static ssize_t Read( access_t *p_access, uint8_t *p_buffer, size_t i_len )
return
i_ret
;
}
#ifdef HAVE_MMAP
# define MMAP_SIZE (1 << 20)
static
block_t
*
mmapBlock
(
access_t
*
p_access
)
{
access_sys_t
*
p_sys
=
p_access
->
p_sys
;
const
int
flags
=
MAP_SHARED
;
off_t
offset
=
p_access
->
info
.
i_pos
&
~
p_sys
->
pagemask
;
size_t
align
=
p_access
->
info
.
i_pos
&
p_sys
->
pagemask
;
size_t
length
=
(
MMAP_SIZE
>
p_sys
->
pagemask
)
?
MMAP_SIZE
:
(
p_sys
->
pagemask
+
1
);
void
*
addr
;
#ifndef NDEBUG
int64_t
dbgpos
=
lseek
(
p_sys
->
fd
,
0
,
SEEK_CUR
);
if
(
dbgpos
!=
p_access
->
info
.
i_pos
)
msg_Err
(
p_access
,
"position: 0x%08llx instead of 0x%08llx"
,
p_access
->
info
.
i_pos
,
dbgpos
);
#endif
if
(
p_access
->
info
.
i_pos
>=
p_access
->
info
.
i_size
)
{
/* End of file - check if file size changed... */
struct
stat
st
;
if
((
fstat
(
p_sys
->
fd
,
&
st
)
==
0
)
&&
(
st
.
st_size
!=
p_access
->
info
.
i_size
))
{
p_access
->
info
.
i_size
=
st
.
st_size
;
p_access
->
info
.
i_update
|=
INPUT_UPDATE_SIZE
;
}
/* Really at end of file then */
if
(
p_access
->
info
.
i_pos
>=
p_access
->
info
.
i_size
)
{
p_access
->
info
.
b_eof
=
VLC_TRUE
;
msg_Dbg
(
p_access
,
"at end of memory mapped file"
);
return
NULL
;
}
}
if
(
offset
+
length
>
p_access
->
info
.
i_size
)
/* Don't mmap beyond end of file */
length
=
p_access
->
info
.
i_size
-
offset
;
assert
(
offset
<=
p_access
->
info
.
i_pos
);
/* and */
assert
(
p_access
->
info
.
i_pos
<
p_access
->
info
.
i_size
);
/* imply */
assert
(
offset
<
p_access
->
info
.
i_size
);
/* imply */
assert
(
length
>
0
);
addr
=
mmap
(
NULL
,
length
,
PROT_READ
,
flags
,
p_sys
->
fd
,
offset
);
if
(
addr
==
MAP_FAILED
)
{
msg_Err
(
p_access
,
"memory mapping failed (%m)"
);
intf_UserFatal
(
p_access
,
VLC_FALSE
,
_
(
"File reading failed"
),
_
(
"VLC could not read the file."
));
msleep
(
INPUT_ERROR_SLEEP
);
return
NULL
;
}
p_access
->
info
.
i_pos
=
offset
+
length
;
block_t
*
block
=
block_mmap_Alloc
(
addr
,
length
);
if
(
block
==
NULL
)
return
NULL
;
block
->
p_buffer
+=
align
;
block
->
i_buffer
-=
align
;
#ifndef NDEBUG
msg_Dbg
(
p_access
,
"mapped 0x%lx bytes at %p from offset 0x%lx"
,
(
unsigned
long
)
length
,
addr
,
(
unsigned
long
)
offset
);
/* Compare normal I/O with memory mapping */
char
*
buf
=
malloc
(
block
->
i_buffer
);
ssize_t
i_read
=
read
(
p_sys
->
fd
,
buf
,
block
->
i_buffer
);
if
(
i_read
!=
(
ssize_t
)
block
->
i_buffer
)
msg_Err
(
p_access
,
"read %u instead of %u bytes"
,
(
unsigned
)
i_read
,
(
unsigned
)
block
->
i_buffer
);
if
(
memcmp
(
buf
,
block
->
p_buffer
,
block
->
i_buffer
))
msg_Err
(
p_access
,
"inconsistent data buffer"
);
free
(
buf
);
#endif
return
block
;
}
#endif
/*****************************************************************************
* Seek: seek to a specific location in a file
*****************************************************************************/
static
int
Seek
(
access_t
*
p_access
,
int64_t
i_pos
)
{
/* FIXME: i_size should really be unsigned */
if
((
uint64_t
)
i_pos
>
(
uint64_t
)
p_access
->
info
.
i_size
)
{
/* This should only happen with corrupted/truncated files. */
msg_Err
(
p_access
,
"seeking too far (0x"
I64Fx
" / 0x"
I64Fx
")"
,
i_pos
,
p_access
->
info
.
i_size
);
i_pos
=
p_access
->
info
.
i_size
;
}
p_access
->
info
.
i_pos
=
i_pos
;
p_access
->
info
.
b_eof
=
VLC_FALSE
;
#if defined (HAVE_MMAP) && defined (NDEBUG)
if
(
p_access
->
pf_block
==
NULL
)
#endif
lseek
(
p_access
->
p_sys
->
fd
,
i_pos
,
SEEK_SET
);
lseek
(
p_access
->
p_sys
->
fd
,
i_pos
,
SEEK_SET
);
return
VLC_SUCCESS
;
}
...
...
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