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Update libpng to version 1.2.37rc01

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This commit is contained in:
Glenn Randers-Pehrson
2009-05-28 18:28:41 -05:00
parent 1742f3f0ef
commit f1dd616644
20 changed files with 1802 additions and 7791 deletions
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5945
ChangeLog.txt
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@@ -1,420 +0,0 @@
Change log:
Version 1.6.17 (built with libpng-1.2.36rc01 and zlib-1.2.3.2)
Defined TOO_FAR == 32767 in deflate.c (again). The definition
has continually been inadvertently omitted during zlib updates
since pngcrush version 1.6.4.
Revised handling of xcode files so at least we can get printout
of IHDR values with "pngcrush -fix -n -v xcode.png"
Version 1.6.16 (built with libpng-1.2.35 and zlib-1.2.3.2)
Added -newtimestamp and -oldtimestamp options and changed
default condition to timestamping the output file with
the current time (i.e., -newtimestamp is default)
If the -oldtimestamp option is used then the output file
has the same timestamp as the input file.
Added CgBI chunk detection.
Version 1.6.15 (built with libpng-1.2.35 and zlib-1.2.3.2)
Fixes some missing typecasts on png_malloc() calls, patch from
an anonymous reporter to the SourceForge bug tracker.
Added -time_stamp option to change time stamping from default
condition.
Version 1.6.14 (built with libpng-1.2.35 and zlib-1.2.3.2)
Avoids CVE-2009-0040.
Version 1.6.12 (built with libpng-1.2.34 and zlib-1.2.3.2)
Version 1.6.11 (built with libpng-1.2.33 and zlib-1.2.3.2)
Eliminated a memory leak in libpng with writing bad tEXt chunks.
Version 1.6.10 (built with libpng-1.2.31 and zlib-1.2.3.2)
Add sTER chunk support.
Version 1.6.9 (built with libpng-1.2.31 and zlib-1.2.3.2)
Updated cexcept.h to version 2.0.1
Add missing curly brackets.
Version 1.6.8 (built with libpng-1.2.29 and zlib-1.2.3.2)
Fixed bug with handling of -z and -zi options.
Version 1.6.7 (built with libpng-1.2.29 and zlib-1.2.3.2)
Moved PNG_UINT_CHNK and some other defines from pngcrush.h to pngcrush.c
Reject invalid color_type or bit_depth.
Version 1.6.6 (built with libpng-1.2.29 and zlib-1.2.3.2)
Added dSIG support. Pngcrush will not rewrite an image containing
a dSIG chunk immediately following the IHDR chunk, unless the
dSIG is explicitly removed with "-rem dSIG" or explicitly kept
with "-keep dSIG". In the latter case the saved dSIG chunks will
become invalid if any changes are made to the datastream.
Fixed bug in writing unknown chunks from the end_info_ptr.
Version 1.6.5 (built with libpng-1.2.29 and zlib-1.2.3.2)
Discontinued adding a new gAMA chunk when writing sRGB chunk.
Version 1.6.4 (built with libpng-1.2.9rc1 and zlib-1.2.3)
Fixed bug in handling of undocumented -trns_a option (Michal Politowski).
Fixed bug with "nosave" handling of unknown chunks.
Version 1.6.3 (built with libpng-1.2.9beta11 and zlib-1.2.3)
Fixed documentation of iTXt input (Shlomi Tal).
Removed #define PNG_INTERNAL and provided prototypes for some
internal libpng functions that are duplicated in pngcrush.c
Version 1.6.2 (built with libpng-1.2.8 and zlib-1.2.3)
Fixed bug with "PNG_ROWBYTES" usage, introduced in version 1.6.0.
The bug could cause a crash and only affects the "nolib" builds.
Converted C++ style (// ...) comments to C style (/* ... */).
Defined TOO_FAR == 32767 in deflate.c (again). The definition was
omitted from version 1.6.0 when zlib was upgraded to version 1.2.3.
Version 1.6.1 (distributed as 1.6.0, built with libpng-1.2.8 and zlib-1.2.3)
Copied non-exported libpng functions from libpng into pngcrush, to make
pngcrush play more nicely with shared libpng. These are #ifdef'ed out
when a static library is being built with the bundled libpng and
pngcrush.h is included.
Version 1.6.0-grr (built with libpng-1.2.4 and zlib-1.1.4pc or zlib-1.2.2)
Moved ChangeLog out of pngcrush.c comments and into a separate file.
Filtered pngcrush.c through "indent -kr" and "expand" for readability.
Moved 550 lines of usage/help/copyright/license/version info to separate
function(s) and cleaned up significantly.
Added some comments for ease of navigation and readability.
Stripped out a bunch of ancient-libpng compatibility stuff.
Defined PNG_UINT_* macros (pngcrush.h for now).
Fixed unknown-chunk handling ("-rem alla" and "-rem gifx" now work).
Created modified version of makefile that supports external zlib.
Added support for methods using Z_RLE zlib strategy (zlib 1.2.x only).
Documented -huffman option in usage screen.
Added IDAT statistics to final per-file summary.
Added utime() support to give output files same timestamps as input files.
Version 1.5.10 (built with libpng-1.2.4 and zlib-1.1.4pc)
Fixed bug, introduced in 1.5.9, that caused defaults for method 0 to
be used instead of copying the original image, when the original was
already smallest.
Version 1.5.9 (built with libpng-1.2.4beta3 and zlib-1.1.4pc)
Work around CPU timer wraparound at 2G microseconds.
Upgraded zlib from 1.1.3 to 1.1.4. Pngcrush is believed not to
be vulnerable to the zlib-1.1.3 buffer-overflow bug.
Choose the first instance of smallest IDAT instead of the last,
for faster final recompression, suggested by TSamuel.
Version 1.5.8 (built with libpng-1.2.1)
Added -trns_a option for entering a tRNS array.
Version 1.5.7 (built with libpng-1.2.0)
Added setargv.obj to Makefile.msc to expand wildcards, e.g., *.png
Use constant string "pngcrush" instead of argv[0] when appropriate.
Only check stats for infile==outfile once per input file, or not at all
if "-nofilecheck" option is present or if a directory was created.
Fixed bugs with changing bit_depth of grayscale images.
Version 1.5.6 (built with libpng-1.0.12)
Eliminated extra "Removed the cHNK chunk" messages generated by version
1.5.5 when "-rem alla" or "-rem allb" is used.
All unknown chunks including safe-to-copy chunks are now removed in
response to the "-rem alla" or "-rem allb" options.
Issue a warning if the user tries "-cc" option when it is not supported.
Version 1.5.5 (built with libpng-1.0.12)
Reset reduce_to_gray and it_is_opaque flags prior to processing each
image.
Enable removal of safe-to-copy chunks that are being handled as unknown
e.g., "-rem time".
Version 1.5.4 (built with libpng-1.0.11)
Added 262 to the length of uncompressed data when calculating
required_window_size, to account for zlib/deflate implementation.
Added "-bit_depth n" to the help screen.
Call png_set_packing() when increasing bit_depth to 2 or 4.
Added warning about not overwriting an existing tRNS chunk.
Reduced the memory usage
Write 500K IDAT chunks even when system libpng is being used.
Ignore all-zero cHRM chunks, with a warning.
Version 1.5.3 (built with libpng-1.0.9beta5)
Added "-loco" option (writes MNG files with filter_method 64)
"-dir" and "-ext" options are no longer mutually exclusive, e.g.:
pngcrush -loco -dir Crushed -ext .mng *.png
Version 1.5.2 (built with libpng-1.0.9beta1)
Added "-iccp" option.
Increased the zlib memory level, which improves compression (typically
about 1.3 percent for photos) at the expense of increased memory usage.
Enabled the "-max max_idat_size" option, even when max_idat_size
exceeds the default 1/2 megabyte size.
Added missing "png_ptr" argument to png_error() call
Added "-loco" option, to enable the LOCO color transformation
(R->R-G, G, B->B-G) while writing a MNG with filter_method 64. Undo
the transformation and write the regular PNG filter_method (0) if the
MNG filter_method 64 is detected.
Revised the "-help" output slightly and improved the "-version" output.
The "-already[_crushed]" option is now ignored if the "-force" option
is present or if chunks are being added, deleted, or modified.
Improved "things_have_changed" behavior (now, when set in a particular
file, it is not set for all remaining files)
Version 1.5.1 (built with libpng-1.0.8)
Disabled color counting by default and made it controllable with new
-cc and -no_cc commandline arguments.
Added some #ifdef PNGCRUSH_COUNT_COLORS around code that needs it.
Revised count_colors() attempting to avoid stack corruption that has
been observed on RedHat 6.2
Added the word "irrevocably" to the license and changed "without fee"
to "without payment of any fee".
Version 1.5.0 (built with libpng-1.0.8)
After encountering an image with a bad Photoshop iCCP chunk, pngcrush
1.4.5 through 1.4.8 write sRGB and gAMA=45455 chunks in all
remaining PNG files on the command line. This has been fixed so the
correction is only applied to the particular bad input file.
Version 1.4.8 (built with libpng-1.0.8rc1)
Detect and remove all-opaque alpha channel.
Detect and reduce all-gray truecolor images to grayscale.
Version 1.4.7 (built with libpng-1.0.8rc1)
Restored the "-ext" option that was inadvertently overridden with
a new "-exit" option in version 1.4.6 ("-exit" is used to force an
"exit" instead of a "return" from the main program).
Version 1.4.6 (built with libpng-1.0.8rc1)
Fixed bug in color-counting of noninterlaced images.
Added capability of processing multiple rows at a time (disabled by
default because it turns out to be no faster).
Replaced "return" statements in main() with "exit" statements.
Force exit instead of return with "-exit" argument.
Added the UCITA disclaimers to the help output.
Version 1.4.5 (built with libpng-1.0.7rc2 and cexcept-1.0.0)
Added color-counting and palette-building capability (enable by
defining PNGCRUSH_COUNT_COLORS). In a future version, this will
give pngcrush the ability to reduce RGBA images to indexed-color
or grayscale when fewer than 257 RGBA combinations are present,
and no color is present that requires 16-bit precision. For now,
it only reports the frequencies.
Added "-fix" option, for fixing bad CRC's and other correctable
conditions.
Write sBIT.alpha=1 when adding an opaque alpha channel and sBIT
is present.
Identify the erroneous 2615-byte sRGB monitor profile being written
by Photoshop 5.5, which causes many apps to crash, and replace it with
an sRGB chunk.
Added a check for input and output on different devices before rejecting
the output file as being the same as the input file based on inode.
Added some UCITA language to the disclaimer.
Version 1.4.4 (built with libpng-1.0.6i and cexcept-0.6.3)
Can be built on RISC OS platforms, thanks to Darren Salt.
Version 1.4.3 (built with libpng-1.0.6h and cexcept-0.6.3)
Reduced scope of Try/Catch blocks to avoid nesting them, and
removed returns from within the Try blocks, where they are not
allowed.
Removed direct access to the png structure when possible, and isolated
the remaining direct accesses to the png structure into new
png_get_compression_buffer_size(), png_set_compression_buffer_size(),
and png_set_unknown_chunk_location() functions that were installed
in libpng version 1.0.6g.
Version 1.4.2 (built with libpng-1.0.6f and cexcept-0.6.0)
Removes extra IDAT chunks (such as found in some POV-ray PNGs) with
a warning instead of bailing out (this feature requires libpng-1.0.6f
or later, compiled with "#define PNG_ABORT()").
Removed old setjmp interface entirely.
Version 1.4.1 (built with libpng-1.0.6e and cexcept-0.6.0)
Uses cexcept.h for error handling instead of libpng's built-in
setjmp/longjmp mechanism. See http://cexcept.sf.net/
Pngcrush.c will now run when compiled with old versions of libpng back
to version 0.96, although some features will not be available.
Version 1.4.0 (built with libpng-1.0.6 + libpng-1.0.6-patch-a)
Version 1.3.6 (built with libpng-1.0.5v)
RGB to Grayscale conversion is more accurate (15-bit instead of 8-bit)
and now uses only integer arithmetic.
#ifdef'ed out PNG_READ_DITHER
Changed "Compressed" to "Uncompressed" in help for -itxt.
Stifled some compiler warnings
Version 1.3.5 (built with libpng-1.0.5s)
Add test on stat_buf.st_size to verify fpin==fpout, because stat in
MSVC++6.0 standard version returns stat_buf.st_ino=0 for all files.
Revised pngcrush.h to make it easier to control PNG_ZBUF_SIZE and
PNG_NO_FLOATING_POINT_SUPPORTED from a makefile.
Restored ability to enter "replace_gamma" value as a float even when
floating point arithmetic is not enabled.
Enabled removing tEXt, zTXt, or iTXt chunks by chunk type, i.e.,
"-rem tEXt" only removes tEXt chunks, while "-rem text" removes all
three types of text chunk.
Removed definition of TOO_FAR from pngcrush.h
Uses new libpng error handler; if a file has errors, pngcrush now will
continue on and compress the remaining files instead of bailing out.
Version 1.3.4 (built with libpng-1.0.5m)
Do not allow pngcrush to overwrite the input file.
Version 1.3.3 (built with libpng-1.0.5m)
Restored ability to enter gamma as a float even when floating point
arithmetic is not enabled.
Version 1.3.2 (built with libpng-1.0.5k)
Renamed "dirname" to "directory_name" to avoid conflict with "dirname"
that appears in string.h on some platforms.
Fixed "PNG_NO_FLOAING_POINT" typo in pngcrush.h
#ifdef'ed out parts of the help screen for options that are unsupported.
Version 1.3.1 (built with libpng-1.0.5k): Eliminated some spurious warnings
that were being issued by libpng-1.0.5j. Added -itxt, -ztxt, and
-zitxt descriptions to the help screen.
Dropped explicit support for pCAL, hIST, sCAL, sPLT, iCCP, tIME, and
cHRM chunks and handle them as unknown but safe-to-copy instead, using
new png_handle_as_unknown function available in libpng-1.0.5k.
Version 1.3.0 (built with libpng-1.0.5j): Added support for handling
unknown chunks.
pngcrush is now fixed-point only, unless PNG_NO_FLOATING_POINT_SUPPORTED
is undefined in pngcrush.h.
Added support for the iCCP, iTXt, sCAL, and sPLT chunks, which
are now supported by libpng (since libpng-1.0.5j). None of these have
been adequately tested.
#ifdef'ed out more unused code (weighted filters and progressive read;
this saves about 15k in the size of the executable).
Moved the special definitions from pngconf.h into a new pngcrush.h
Disallow 256-byte compression window size when writing, to work around
an apparent zlib bug. Either deflate was producing incorrect results in a
21x21 4-bit image or inflate was decoding it incorrectly; the uncompressed
stream is 252 bytes, which is uncomfortably close to the resulting
256-byte compression window. This workaround can be removed when zlib
is fixed.
The "-m method" can be used any of the 124 methods, without having to
specify the filter, level, and strategy, instead of just the first 10.
Version 1.2.1 (built with libpng-1.0.5f): Fixed -srgb parameter so it
really does take an argument, and so it continues to use "0" if an
integer does not follow the -srgb.
Added "-plte_len n" argument for truncating the PLTE. Be sure not to
truncate it to less than the greatest index actually appearing in IDAT.
Version 1.2.0: Removed registration requirement. Added open source
license. Redefined TOO_FAR=32k in deflate.c.
Changes prior to going "open source":
Version 1.1.8: built with libpng-1.0.5a. Runs OK with pngvcrd.c.
Version 1.1.7: added ability to add tEXt/zTXt chunks. Fixed bug with
closing a file that wasn't opened when using "pngcrush -n". Fixed
bug with tEXt/zTXt chunks after IDAT not being copied.
Added alpha to the displayed palette table. Rebuilt with libpng-1.0.5.
Version 1.1.6: fixed bug with one file left open after each image is
processed
Version 1.1.5: Shorten or remove tRNS chunks that are all opaque or have
opaque entries at the end. Added timing report.
Version 1.1.4: added ability to restrict brute_force to one or more filter
types, compression levels, or compression strategies.

460
png.c
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@@ -1,9 +1,9 @@
/* png.c - location for general purpose libpng functions
*
* Last changed in libpng 1.2.34 [December 18, 2008]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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.)
*/
@@ -13,7 +13,7 @@
#include "png.h"
/* Generate a compiler error if there is an old png.h in the search path. */
typedef version_1_2_36 Your_png_h_is_not_version_1_2_36;
typedef version_1_2_37rc01 Your_png_h_is_not_version_1_2_37rc01;
/* Version information for C files. This had better match the version
* string defined in png.h. */
@@ -53,18 +53,18 @@ PNG_tRNS;
PNG_zTXt;
#ifdef PNG_READ_SUPPORTED
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* Offset to next interlace block */
PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
/* Start of interlace block in the y direction */
PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
/* Offset to next interlace block in the y direction */
PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
@@ -92,7 +92,8 @@ PNG_CONST int FARDATA png_pass_dsp_mask[]
void PNGAPI
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_debug(1, "in png_set_sig_bytes");
if (num_bytes > 8)
png_error(png_ptr, "Too many bytes for PNG signature.");
@@ -153,7 +154,8 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
png_uint_32 save_flags=p->flags;
png_uint_32 num_bytes;
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
if (items > PNG_UINT_32_MAX/size)
{
png_warning (p, "Potential overflow in png_zalloc()");
@@ -183,7 +185,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
return ((voidpf)ptr);
}
/* function to free memory for zlib */
/* Function to free memory for zlib */
#ifdef PNG_1_0_X
void PNGAPI
#else
@@ -241,7 +243,8 @@ png_create_info_struct(png_structp png_ptr)
png_infop info_ptr;
png_debug(1, "in png_create_info_struct");
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
png_ptr->malloc_fn, png_ptr->mem_ptr);
@@ -263,7 +266,8 @@ void PNGAPI
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
{
png_infop info_ptr = NULL;
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_debug(1, "in png_destroy_info_struct");
if (info_ptr_ptr != NULL)
@@ -302,18 +306,19 @@ png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
{
png_infop info_ptr = *ptr_ptr;
if (info_ptr == NULL) return;
if (info_ptr == NULL)
return;
png_debug(1, "in png_info_init_3");
if (png_sizeof(png_info) > png_info_struct_size)
{
png_destroy_struct(info_ptr);
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
*ptr_ptr = info_ptr;
}
{
png_destroy_struct(info_ptr);
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
*ptr_ptr = info_ptr;
}
/* set everything to 0 */
/* Set everything to 0 */
png_memset(info_ptr, 0, png_sizeof(png_info));
}
@@ -344,245 +349,245 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
return;
#if defined(PNG_TEXT_SUPPORTED)
/* free text item num or (if num == -1) all text items */
/* 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)
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
#else
if (mask & PNG_FREE_TEXT)
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;
}
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;
}
}
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 */
/* Free any tRNS entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
#endif
{
png_free(png_ptr, info_ptr->trans);
info_ptr->trans = NULL;
info_ptr->valid &= ~PNG_INFO_tRNS;
{
png_free(png_ptr, info_ptr->trans);
info_ptr->trans = NULL;
info_ptr->valid &= ~PNG_INFO_tRNS;
#ifndef PNG_FREE_ME_SUPPORTED
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
#endif
}
}
#endif
#if defined(PNG_sCAL_SUPPORTED)
/* free any sCAL entry */
/* Free any sCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
#else
if (mask & PNG_FREE_SCAL)
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;
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;
}
info_ptr->valid &= ~PNG_INFO_sCAL;
}
#endif
#if defined(PNG_pCAL_SUPPORTED)
/* free any pCAL entry */
/* Free any pCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
#else
if (mask & PNG_FREE_PCAL)
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;
}
{
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 */
/* Free any iCCP entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
#else
if (mask & PNG_FREE_ICCP)
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;
}
{
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 */
/* 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)
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
#else
if (mask & PNG_FREE_SPLT)
if (mask & PNG_FREE_SPLT)
#endif
{
if (num != -1)
{
if (info_ptr->splt_palettes)
if (num != -1)
{
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;
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;
}
}
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)
if (png_ptr->unknown_chunk.data)
{
png_free(png_ptr, png_ptr->unknown_chunk.data);
png_ptr->unknown_chunk.data = NULL;
}
if (png_ptr->unknown_chunk.data)
{
png_free(png_ptr, png_ptr->unknown_chunk.data);
png_ptr->unknown_chunk.data = NULL;
}
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
#else
if (mask & PNG_FREE_UNKN)
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 (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);
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;
}
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 */
/* Free any hIST entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
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;
{
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;
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
#endif
}
}
#endif
/* free any PLTE entry that was internally allocated */
/* Free any PLTE entry that was internally allocated */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
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;
{
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;
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
#endif
info_ptr->num_palette = 0;
}
info_ptr->num_palette = 0;
}
#if defined(PNG_INFO_IMAGE_SUPPORTED)
/* free any image bits attached to the info structure */
/* Free any image bits attached to the info structure */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
#else
if (mask & PNG_FREE_ROWS)
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;
}
{
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;
info_ptr->free_me &= ~mask;
else
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
#endif
}
@@ -600,9 +605,9 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
if (png_ptr->num_chunk_list)
{
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list=NULL;
png_ptr->num_chunk_list = 0;
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list=NULL;
png_ptr->num_chunk_list = 0;
}
#endif
@@ -617,7 +622,8 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
png_voidp PNGAPI
png_get_io_ptr(png_structp png_ptr)
{
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
return (png_ptr->io_ptr);
}
@@ -633,7 +639,8 @@ void PNGAPI
png_init_io(png_structp png_ptr, png_FILE_p fp)
{
png_debug(1, "in png_init_io");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->io_ptr = (png_voidp)fp;
}
#endif
@@ -649,7 +656,8 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
@@ -693,9 +701,9 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
png_charp PNGAPI
png_get_copyright(png_structp png_ptr)
{
png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
return ((png_charp) "\n libpng version 1.2.36 - May 7, 2009\n\
Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) "\n libpng version 1.2.37rc01 - May 27, 2009\n\
Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\
Copyright (c) 1996-1997 Andreas Dilger\n\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
}
@@ -712,7 +720,7 @@ png_charp PNGAPI
png_get_libpng_ver(png_structp png_ptr)
{
/* Version of *.c files used when building libpng */
png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) PNG_LIBPNG_VER_STRING);
}
@@ -720,7 +728,7 @@ png_charp PNGAPI
png_get_header_ver(png_structp png_ptr)
{
/* Version of *.h files used when building libpng */
png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) PNG_LIBPNG_VER_STRING);
}
@@ -728,7 +736,7 @@ png_charp PNGAPI
png_get_header_version(png_structp png_ptr)
{
/* Returns longer string containing both version and date */
png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) PNG_HEADER_VERSION_STRING
#ifndef PNG_READ_SUPPORTED
" (NO READ SUPPORT)"
@@ -741,7 +749,7 @@ png_get_header_version(png_structp png_ptr)
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 */
/* 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)
@@ -758,7 +766,8 @@ png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
int PNGAPI
png_reset_zstream(png_structp png_ptr)
{
if (png_ptr == NULL) return Z_STREAM_ERROR;
if (png_ptr == NULL)
return Z_STREAM_ERROR;
return (inflateReset(&png_ptr->zstream));
}
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
@@ -774,11 +783,11 @@ png_access_version_number(void)
#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
#if !defined(PNG_1_0_X)
/* this function was added to libpng 1.2.0 */
/* This function was added to libpng 1.2.0 */
int PNGAPI
png_mmx_support(void)
{
/* obsolete, to be removed from libpng-1.4.0 */
/* Obsolete, to be removed from libpng-1.4.0 */
return -1;
}
#endif /* PNG_1_0_X */
@@ -791,9 +800,9 @@ png_mmx_support(void)
png_size_t PNGAPI
png_convert_size(size_t size)
{
if (size > (png_size_t)-1)
PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
return ((png_size_t)size);
if (size > (png_size_t)-1)
PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
return ((png_size_t)size);
}
#endif /* PNG_SIZE_T */
@@ -802,43 +811,44 @@ png_convert_size(size_t size)
#if !defined(PNG_NO_CHECK_cHRM)
/*
Multiply two 32-bit numbers, V1 and V2, using 32-bit
arithmetic, to produce a 64 bit result in the HI/LO words.
A B
x C D
------
AD || BD
AC || CB || 0
where A and B are the high and low 16-bit words of V1,
C and D are the 16-bit words of V2, AD is the product of
A and D, and X || Y is (X << 16) + Y.
* Multiply two 32-bit numbers, V1 and V2, using 32-bit
* arithmetic, to produce a 64 bit result in the HI/LO words.
*
* A B
* x C D
* ------
* AD || BD
* AC || CB || 0
*
* where A and B are the high and low 16-bit words of V1,
* C and D are the 16-bit words of V2, AD is the product of
* A and D, and X || Y is (X << 16) + Y.
*/
void png_64bit_product (long v1, long v2, unsigned long *hi_product,
unsigned long *lo_product)
{
int a, b, c, d;
long lo, hi, x, y;
int a, b, c, d;
long lo, hi, x, y;
a = (v1 >> 16) & 0xffff;
b = v1 & 0xffff;
c = (v2 >> 16) & 0xffff;
d = v2 & 0xffff;
a = (v1 >> 16) & 0xffff;
b = v1 & 0xffff;
c = (v2 >> 16) & 0xffff;
d = v2 & 0xffff;
lo = b * d; /* BD */
x = a * d + c * b; /* AD + CB */
y = ((lo >> 16) & 0xffff) + x;
lo = b * d; /* BD */
x = a * d + c * b; /* AD + CB */
y = ((lo >> 16) & 0xffff) + x;
lo = (lo & 0xffff) | ((y & 0xffff) << 16);
hi = (y >> 16) & 0xffff;
lo = (lo & 0xffff) | ((y & 0xffff) << 16);
hi = (y >> 16) & 0xffff;
hi += a * c; /* AC */
hi += a * c; /* AC */
*hi_product = (unsigned long)hi;
*lo_product = (unsigned long)lo;
*hi_product = (unsigned long)hi;
*lo_product = (unsigned long)lo;
}
int /* private */
png_check_cHRM_fixed(png_structp png_ptr,
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,

26
png.h
View File

@@ -1,6 +1,6 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.2.36 - May 7, 2009
* libpng version 1.2.37rc01 - May 27, 2009
* Copyright (c) 1998-2009 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.)
@@ -8,7 +8,7 @@
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.2.36 - May 7, 2009: Glenn
* libpng versions 0.97, January 1998, through 1.2.37rc01 - May 27, 2009: Glenn
* See also "Contributing Authors", below.
*
* Note about libpng version numbers:
@@ -226,6 +226,8 @@
* 1.2.36rc01 13 10236 12.so.0.36[.0]
* 1.0.44 10 10044 10.so.0.44[.0]
* 1.2.36 13 10236 12.so.0.36[.0]
* 1.2.37beta01-03 13 10237 12.so.0.37[.0]
* 1.2.37rc01 13 10237 12.so.0.37[.0]
*
* Henceforth the source version will match the shared-library major
* and minor numbers; the shared-library major version number will be
@@ -255,7 +257,7 @@
* If you modify libpng you may insert additional notices immediately following
* this sentence.
*
* libpng versions 1.2.6, August 15, 2004, through 1.2.36, May 7, 2009, are
* libpng versions 1.2.6, August 15, 2004, through 1.2.37rc01, May 27, 2009, are
* Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
* distributed according to the same disclaimer and license as libpng-1.2.5
* with the following individual added to the list of Contributing Authors:
@@ -367,13 +369,13 @@
* Y2K compliance in libpng:
* =========================
*
* May 7, 2009
* May 27, 2009
*
* Since the PNG Development group is an ad-hoc body, we can't make
* an official declaration.
*
* This is your unofficial assurance that libpng from version 0.71 and
* upward through 1.2.36 are Y2K compliant. It is my belief that earlier
* upward through 1.2.37rc01 are Y2K compliant. It is my belief that earlier
* versions were also Y2K compliant.
*
* Libpng only has three year fields. One is a 2-byte unsigned integer
@@ -429,9 +431,9 @@
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.2.36"
#define PNG_LIBPNG_VER_STRING "1.2.37rc01"
#define PNG_HEADER_VERSION_STRING \
" libpng version 1.2.36 - May 7, 2009\n"
" libpng version 1.2.37rc01 - May 27, 2009\n"
#define PNG_LIBPNG_VER_SONUM 0
#define PNG_LIBPNG_VER_DLLNUM 13
@@ -439,11 +441,11 @@
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
#define PNG_LIBPNG_VER_MAJOR 1
#define PNG_LIBPNG_VER_MINOR 2
#define PNG_LIBPNG_VER_RELEASE 36
#define PNG_LIBPNG_VER_RELEASE 37
/* This should match the numeric part of the final component of
* PNG_LIBPNG_VER_STRING, omitting any leading zero: */
#define PNG_LIBPNG_VER_BUILD 0
#define PNG_LIBPNG_VER_BUILD 01
/* Release Status */
#define PNG_LIBPNG_BUILD_ALPHA 1
@@ -460,14 +462,14 @@
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
PNG_LIBPNG_BUILD_PRIVATE */
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_RC
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros.
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
* version 1.0.0 was mis-numbered 100 instead of 10000). From
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
#define PNG_LIBPNG_VER 10236 /* 1.2.36 */
#define PNG_LIBPNG_VER 10237 /* 1.2.37 */
#ifndef PNG_VERSION_INFO_ONLY
/* include the compression library's header */
@@ -1491,7 +1493,7 @@ struct png_struct_def
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
typedef png_structp version_1_2_36;
typedef png_structp version_1_2_37rc01;
typedef png_struct FAR * FAR * png_structpp;

2
pngconf.h
View File

@@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng version 1.2.36 - May 7, 2009
* libpng version 1.2.37rc01 - May 27, 2009
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

10
pngerror.c
View File

@@ -1,7 +1,7 @@
/* pngerror.c - stub functions for i/o and memory allocation
*
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -234,9 +234,11 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
fprintf(stderr, PNG_STRING_NEWLINE);
}
else
{
fprintf(stderr, "libpng error: %s, offset=%d",
error_message, offset);
fprintf(stderr, PNG_STRING_NEWLINE);
}
}
else
#endif
@@ -263,7 +265,7 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
PNG_ABORT();
#endif
#ifdef PNG_NO_CONSOLE_IO
error_message = error_message; /* make compiler happy */
error_message = error_message; /* Make compiler happy */
#endif
}
@@ -309,9 +311,9 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
fprintf(stderr, PNG_STRING_NEWLINE);
}
#else
warning_message = warning_message; /* make compiler happy */
warning_message = warning_message; /* Make compiler happy */
#endif
png_ptr = png_ptr; /* make compiler happy */
png_ptr = png_ptr; /* Make compiler happy */
}
#endif /* PNG_NO_WARNINGS */

108
pngget.c
View File

@@ -1,9 +1,9 @@
/* pngget.c - retrieval of values from info struct
*
* Last changed in libpng 1.2.30 [August 15, 2008]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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.)
*/
@@ -17,6 +17,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
{
if (png_ptr != NULL && info_ptr != NULL)
return(info_ptr->valid & flag);
else
return(0);
}
@@ -26,6 +27,7 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return(info_ptr->rowbytes);
else
return(0);
}
@@ -36,20 +38,20 @@ png_get_rows(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return(info_ptr->row_pointers);
else
return(0);
}
#endif
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* easy access to info, added in libpng-0.99 */
/* Easy access to info, added in libpng-0.99 */
png_uint_32 PNGAPI
png_get_image_width(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->width;
}
return (0);
}
@@ -57,9 +59,8 @@ png_uint_32 PNGAPI
png_get_image_height(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->height;
}
return (0);
}
@@ -67,9 +68,8 @@ png_byte PNGAPI
png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->bit_depth;
}
return (0);
}
@@ -77,9 +77,8 @@ png_byte PNGAPI
png_get_color_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->color_type;
}
return (0);
}
@@ -87,9 +86,8 @@ png_byte PNGAPI
png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->filter_type;
}
return (0);
}
@@ -97,9 +95,8 @@ png_byte PNGAPI
png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->interlace_type;
}
return (0);
}
@@ -107,9 +104,8 @@ png_byte PNGAPI
png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
{
return info_ptr->compression_type;
}
return (0);
}
@@ -121,8 +117,10 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter");
if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
return (0);
else return (info_ptr->x_pixels_per_unit);
}
#else
@@ -139,8 +137,10 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter");
if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
return (0);
else return (info_ptr->y_pixels_per_unit);
}
#else
@@ -157,9 +157,11 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
return (0);
else return (info_ptr->x_pixels_per_unit);
}
#else
@@ -174,6 +176,7 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
#if defined(PNG_pHYs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
@@ -184,7 +187,7 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
/(float)info_ptr->x_pixels_per_unit));
}
#else
return (0.0);
return (0.0);
#endif
return ((float)0.0);
}
@@ -195,15 +198,18 @@ png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
#if defined(PNG_oFFs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->x_offset);
}
#else
return (0);
return (0);
#endif
return (0);
}
@@ -212,12 +218,15 @@ png_int_32 PNGAPI
png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
#if defined(PNG_oFFs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->y_offset);
}
#else
@@ -230,12 +239,15 @@ png_int_32 PNGAPI
png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
#if defined(PNG_oFFs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->x_offset);
}
#else
@@ -248,12 +260,15 @@ png_int_32 PNGAPI
png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
#if defined(PNG_oFFs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->y_offset);
}
#else
@@ -495,8 +510,9 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
png_debug1(1, "in %s retrieval function", "iCCP");
*name = info_ptr->iccp_name;
*profile = info_ptr->iccp_profile;
/* compression_type is a dummy so the API won't have to change
if we introduce multiple compression types later. */
/* Compression_type is a dummy so the API won't have to change
* if we introduce multiple compression types later.
*/
*proflen = (int)info_ptr->iccp_proflen;
*compression_type = (int)info_ptr->iccp_compression;
return (PNG_INFO_iCCP);
@@ -549,22 +565,29 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
*height = info_ptr->height;
*bit_depth = info_ptr->bit_depth;
if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
png_error(png_ptr, "Invalid bit depth");
png_error(png_ptr, "Invalid bit depth");
*color_type = info_ptr->color_type;
if (info_ptr->color_type > 6)
png_error(png_ptr, "Invalid color type");
png_error(png_ptr, "Invalid color type");
if (compression_type != NULL)
*compression_type = info_ptr->compression_type;
if (filter_type != NULL)
*filter_type = info_ptr->filter_type;
if (interlace_type != NULL)
*interlace_type = info_ptr->interlace_type;
/* check for potential overflow of rowbytes */
/* Check for potential overflow of rowbytes */
if (*width == 0 || *width > PNG_UINT_31_MAX)
png_error(png_ptr, "Invalid image width");
if (*height == 0 || *height > PNG_UINT_31_MAX)
png_error(png_ptr, "Invalid image height");
if (info_ptr->width > (PNG_UINT_32_MAX
>> 3) /* 8-byte RGBA pixels */
- 64 /* bigrowbuf hack */
@@ -575,6 +598,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
png_warning(png_ptr,
"Width too large for libpng to process image data.");
}
return (1);
}
return (0);
@@ -605,8 +629,8 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
png_charp *units, png_charpp *params)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
&& purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
nparams != NULL && units != NULL && params != NULL)
&& purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
nparams != NULL && units != NULL && params != NULL)
{
png_debug1(1, "in %s retrieval function", "pCAL");
*purpose = info_ptr->pcal_purpose;
@@ -629,7 +653,7 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
int *unit, double *width, double *height)
{
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_sCAL))
(info_ptr->valid & PNG_INFO_sCAL))
{
*unit = info_ptr->scal_unit;
*width = info_ptr->scal_pixel_width;
@@ -645,7 +669,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
int *unit, png_charpp width, png_charpp height)
{
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_sCAL))
(info_ptr->valid & PNG_INFO_sCAL))
{
*unit = info_ptr->scal_unit;
*width = info_ptr->scal_s_width;
@@ -669,16 +693,19 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
(info_ptr->valid & PNG_INFO_pHYs))
{
png_debug1(1, "in %s retrieval function", "pHYs");
if (res_x != NULL)
{
*res_x = info_ptr->x_pixels_per_unit;
retval |= PNG_INFO_pHYs;
}
if (res_y != NULL)
{
*res_y = info_ptr->y_pixels_per_unit;
retval |= PNG_INFO_pHYs;
}
if (unit_type != NULL)
{
*unit_type = (int)info_ptr->phys_unit_type;
@@ -730,10 +757,13 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
png_debug1(1, "in %s retrieval function",
(png_ptr->chunk_name[0] == '\0' ? "text"
: (png_const_charp)png_ptr->chunk_name));
if (text_ptr != NULL)
*text_ptr = info_ptr->text;
if (num_text != NULL)
*num_text = info_ptr->num_text;
return ((png_uint_32)info_ptr->num_text);
}
if (num_text != NULL)
@@ -773,6 +803,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
*trans = info_ptr->trans;
retval |= PNG_INFO_tRNS;
}
if (trans_values != NULL)
*trans_values = &(info_ptr->trans_values);
}
@@ -783,6 +814,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
*trans_values = &(info_ptr->trans_values);
retval |= PNG_INFO_tRNS;
}
if (trans != NULL)
*trans = NULL;
}
@@ -836,47 +868,47 @@ png_get_compression_buffer_size(png_structp png_ptr)
#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
#ifndef PNG_1_0_X
/* this function was added to libpng 1.2.0 and should exist by default */
/* This function was added to libpng 1.2.0 and should exist by default */
png_uint_32 PNGAPI
png_get_asm_flags (png_structp png_ptr)
{
/* obsolete, to be removed from libpng-1.4.0 */
/* Obsolete, to be removed from libpng-1.4.0 */
return (png_ptr? 0L: 0L);
}
/* this function was added to libpng 1.2.0 and should exist by default */
/* This function was added to libpng 1.2.0 and should exist by default */
png_uint_32 PNGAPI
png_get_asm_flagmask (int flag_select)
{
/* obsolete, to be removed from libpng-1.4.0 */
/* Obsolete, to be removed from libpng-1.4.0 */
flag_select=flag_select;
return 0L;
}
/* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
/* this function was added to libpng 1.2.0 */
/* This function was added to libpng 1.2.0 */
png_uint_32 PNGAPI
png_get_mmx_flagmask (int flag_select, int *compilerID)
{
/* obsolete, to be removed from libpng-1.4.0 */
/* Obsolete, to be removed from libpng-1.4.0 */
flag_select=flag_select;
*compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */
return 0L;
}
/* this function was added to libpng 1.2.0 */
/* This function was added to libpng 1.2.0 */
png_byte PNGAPI
png_get_mmx_bitdepth_threshold (png_structp png_ptr)
{
/* obsolete, to be removed from libpng-1.4.0 */
/* Obsolete, to be removed from libpng-1.4.0 */
return (png_ptr? 0: 0);
}
/* this function was added to libpng 1.2.0 */
/* This function was added to libpng 1.2.0 */
png_uint_32 PNGAPI
png_get_mmx_rowbytes_threshold (png_structp png_ptr)
{
/* obsolete, to be removed from libpng-1.4.0 */
/* Obsolete, to be removed from libpng-1.4.0 */
return (png_ptr? 0L: 0L);
}
#endif /* ?PNG_1_0_X */

87
pngmem.c
View File

@@ -1,9 +1,9 @@
/* pngmem.c - stub functions for memory allocation
*
* Last changed in libpng 1.2.30 [August 15, 2008]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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.)
*
@@ -20,7 +20,7 @@
/* Borland DOS special memory handler */
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
/* if you change this, be sure to change the one in png.h also */
/* If you change this, be sure to change the one in png.h also */
/* Allocate memory for a png_struct. The malloc and memset can be replaced
by a single call to calloc() if this is thought to improve performance. */
@@ -40,11 +40,11 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
size = png_sizeof(png_info);
size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
size = png_sizeof(png_struct);
size = png_sizeof(png_struct);
else
return (png_get_copyright(NULL));
return (png_get_copyright(NULL));
#ifdef PNG_USER_MEM_SUPPORTED
if (malloc_fn != NULL)
@@ -56,7 +56,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
}
else
#endif /* PNG_USER_MEM_SUPPORTED */
struct_ptr = (png_voidp)farmalloc(size);
struct_ptr = (png_voidp)farmalloc(size);
if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
return (struct_ptr);
@@ -122,9 +122,9 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr->malloc_fn != NULL)
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
else
ret = (png_malloc_default(png_ptr, size));
ret = (png_malloc_default(png_ptr, size));
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of memory!");
return (ret);
@@ -149,12 +149,12 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
#endif
if (size != (size_t)size)
ret = NULL;
ret = NULL;
else if (size == (png_uint_32)65536L)
{
if (png_ptr->offset_table == NULL)
{
/* try to see if we need to do any of this fancy stuff */
/* Try to see if we need to do any of this fancy stuff */
ret = farmalloc(size);
if (ret == NULL || ((png_size_t)ret & 0xffff))
{
@@ -269,10 +269,10 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
return (ret);
}
/* free a pointer allocated by png_malloc(). In the default
configuration, png_ptr is not used, but is passed in case it
is needed. If ptr is NULL, return without taking any action. */
/* Free a pointer allocated by png_malloc(). In the default
* configuration, png_ptr is not used, but is passed in case it
* is needed. If ptr is NULL, return without taking any action.
*/
void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr)
{
@@ -285,7 +285,8 @@ png_free(png_structp png_ptr, png_voidp ptr)
(*(png_ptr->free_fn))(png_ptr, ptr);
return;
}
else png_free_default(png_ptr, ptr);
else
png_free_default(png_ptr, ptr);
}
void PNGAPI
@@ -293,7 +294,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
if (png_ptr == NULL || ptr == NULL) return;
if (png_ptr == NULL || ptr == NULL)
return;
if (png_ptr->offset_table != NULL)
{
@@ -420,10 +422,11 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
}
/* Allocate memory. For reasonable files, size should never exceed
64K. However, zlib may allocate more then 64K if you don't tell
it not to. See zconf.h and png.h for more information. zlib does
need to allocate exactly 64K, so whatever you call here must
have the ability to do that. */
* 64K. However, zlib may allocate more then 64K if you don't tell
* it not to. See zconf.h and png.h for more information. zlib does
* need to allocate exactly 64K, so whatever you call here must
* have the ability to do that.
*/
png_voidp PNGAPI
@@ -436,9 +439,9 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
return (NULL);
if (png_ptr->malloc_fn != NULL)
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
else
ret = (png_malloc_default(png_ptr, size));
ret = (png_malloc_default(png_ptr, size));
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of Memory!");
return (ret);
@@ -465,23 +468,23 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
}
#endif
/* Check for overflow */
/* Check for overflow */
#if defined(__TURBOC__) && !defined(__FLAT__)
if (size != (unsigned long)size)
ret = NULL;
else
ret = farmalloc(size);
if (size != (unsigned long)size)
ret = NULL;
else
ret = farmalloc(size);
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
if (size != (unsigned long)size)
ret = NULL;
else
ret = halloc(size, 1);
if (size != (unsigned long)size)
ret = NULL;
else
ret = halloc(size, 1);
# else
if (size != (size_t)size)
ret = NULL;
else
ret = malloc((size_t)size);
if (size != (size_t)size)
ret = NULL;
else
ret = malloc((size_t)size);
# endif
#endif
@@ -494,7 +497,8 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
}
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
without taking any action. */
* without taking any action.
*/
void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr)
{
@@ -507,7 +511,8 @@ png_free(png_structp png_ptr, png_voidp ptr)
(*(png_ptr->free_fn))(png_ptr, ptr);
return;
}
else png_free_default(png_ptr, ptr);
else
png_free_default(png_ptr, ptr);
}
void PNGAPI
png_free_default(png_structp png_ptr, png_voidp ptr)
@@ -543,7 +548,8 @@ png_malloc_warn(png_structp png_ptr, png_uint_32 size)
{
png_voidp ptr;
png_uint_32 save_flags;
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
save_flags = png_ptr->flags;
png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
@@ -603,7 +609,8 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
png_voidp PNGAPI
png_get_mem_ptr(png_structp png_ptr)
{
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
return ((png_voidp)png_ptr->mem_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */

218
pngpread.c
View File

@@ -1,9 +1,9 @@
/* pngpread.c - read a png file in push mode
*
* Last changed in libpng 1.2.32 [September 18, 2008]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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.)
*/
@@ -12,7 +12,7 @@
#include "png.h"
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
/* push model modes */
/* Push model modes */
#define PNG_READ_SIG_MODE 0
#define PNG_READ_CHUNK_MODE 1
#define PNG_READ_IDAT_MODE 2
@@ -27,7 +27,9 @@ void PNGAPI
png_process_data(png_structp png_ptr, png_infop info_ptr,
png_bytep buffer, png_size_t buffer_size)
{
if (png_ptr == NULL || info_ptr == NULL) return;
if (png_ptr == NULL || info_ptr == NULL)
return;
png_push_restore_buffer(png_ptr, buffer, buffer_size);
while (png_ptr->buffer_size)
@@ -42,7 +44,9 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
void /* PRIVATE */
png_process_some_data(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
switch (png_ptr->process_mode)
{
case PNG_READ_SIG_MODE:
@@ -50,22 +54,26 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
png_push_read_sig(png_ptr, info_ptr);
break;
}
case PNG_READ_CHUNK_MODE:
{
png_push_read_chunk(png_ptr, info_ptr);
break;
}
case PNG_READ_IDAT_MODE:
{
png_push_read_IDAT(png_ptr);
break;
}
#if defined(PNG_READ_tEXt_SUPPORTED)
case PNG_READ_tEXt_MODE:
{
png_push_read_tEXt(png_ptr, info_ptr);
break;
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
case PNG_READ_zTXt_MODE:
@@ -73,6 +81,7 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
png_push_read_zTXt(png_ptr, info_ptr);
break;
}
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
case PNG_READ_iTXt_MODE:
@@ -80,12 +89,14 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
png_push_read_iTXt(png_ptr, info_ptr);
break;
}
#endif
case PNG_SKIP_MODE:
{
png_push_crc_finish(png_ptr);
break;
}
default:
{
png_ptr->buffer_size = 0;
@@ -224,13 +235,16 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr->push_length != 13)
png_error(png_ptr, "Invalid IHDR length");
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
}
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -238,11 +252,13 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
png_ptr->process_mode = PNG_READ_DONE_MODE;
png_push_have_end(png_ptr, info_ptr);
}
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
{
@@ -251,20 +267,26 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_ptr->mode |= PNG_HAVE_IDAT;
png_handle_unknown(png_ptr, info_ptr, png_ptr->push_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");
}
}
#endif
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
{
@@ -275,23 +297,26 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
}
png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
}
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
/* If we reach an IDAT chunk, this means we have read all of the
* header chunks, and we can start reading the image (or if this
* is called after the image has been read - we have an error).
*/
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");
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");
if (png_ptr->mode & PNG_HAVE_IDAT)
{
if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
if (png_ptr->push_length == 0)
return;
if (png_ptr->push_length == 0)
return;
if (png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
@@ -305,6 +330,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_ptr->zstream.next_out = png_ptr->row_buf;
return;
}
#if defined(PNG_READ_gAMA_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
{
@@ -313,8 +339,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
@@ -324,8 +352,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
@@ -335,8 +365,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
@@ -346,8 +378,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
@@ -357,8 +391,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
@@ -368,8 +404,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
@@ -379,8 +417,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_bKGD_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
@@ -390,8 +430,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
@@ -401,8 +443,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
@@ -412,8 +456,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
@@ -423,9 +469,11 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
{
@@ -434,8 +482,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
@@ -445,8 +495,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
@@ -456,8 +508,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
@@ -467,8 +521,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
@@ -478,8 +534,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
@@ -489,8 +547,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
else
{
@@ -565,7 +625,9 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
{
png_bytep ptr;
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
ptr = buffer;
if (png_ptr->save_buffer_size)
{
@@ -589,6 +651,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
if (length < png_ptr->current_buffer_size)
save_size = length;
else
save_size = png_ptr->current_buffer_size;
@@ -629,6 +692,7 @@ png_push_save_buffer(png_structp png_ptr)
{
png_error(png_ptr, "Potential overflow of save_buffer");
}
new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
old_buffer = png_ptr->save_buffer;
png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
@@ -697,7 +761,8 @@ png_push_read_IDAT(png_structp png_ptr)
if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
{
save_size = (png_size_t)png_ptr->idat_size;
/* check for overflow */
/* Check for overflow */
if ((png_uint_32)save_size != png_ptr->idat_size)
png_error(png_ptr, "save_size overflowed in pngpread");
}
@@ -705,8 +770,10 @@ png_push_read_IDAT(png_structp png_ptr)
save_size = png_ptr->save_buffer_size;
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_ptr->idat_size -= save_size;
png_ptr->buffer_size -= save_size;
png_ptr->save_buffer_size -= save_size;
@@ -719,7 +786,8 @@ png_push_read_IDAT(png_structp png_ptr)
if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
{
save_size = (png_size_t)png_ptr->idat_size;
/* check for overflow */
/* Check for overflow */
if ((png_uint_32)save_size != png_ptr->idat_size)
png_error(png_ptr, "save_size overflowed in pngpread");
}
@@ -769,6 +837,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
{
if (png_ptr->zstream.avail_in)
png_error(png_ptr, "Extra compressed data");
if (!(png_ptr->zstream.avail_out))
{
png_push_process_row(png_ptr);
@@ -780,6 +849,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
}
else if (ret == Z_BUF_ERROR)
break;
else
png_error(png_ptr, "Decompression Error");
}
@@ -801,6 +871,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
png_ptr->zstream.next_out = png_ptr->row_buf;
}
else
break;
}
@@ -829,7 +900,7 @@ png_push_process_row(png_structp png_ptr)
png_do_read_transformations(png_ptr);
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* blow up interlaced rows to full size */
/* Blow up interlaced rows to full size */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
@@ -847,9 +918,10 @@ png_push_process_row(png_structp png_ptr)
for (i = 0; i < 8 && png_ptr->pass == 0; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */
}
if (png_ptr->pass == 2) /* pass 1 might be empty */
if (png_ptr->pass == 2) /* Pass 1 might be empty */
{
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
@@ -857,6 +929,7 @@ png_push_process_row(png_structp png_ptr)
png_read_push_finish_row(png_ptr);
}
}
if (png_ptr->pass == 4 && png_ptr->height <= 4)
{
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
@@ -865,13 +938,16 @@ png_push_process_row(png_structp png_ptr)
png_read_push_finish_row(png_ptr);
}
}
if (png_ptr->pass == 6 && png_ptr->height <= 4)
{
png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
break;
}
case 1:
{
int i;
@@ -880,7 +956,8 @@ png_push_process_row(png_structp png_ptr)
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 2) /* skip top 4 generated rows */
if (png_ptr->pass == 2) /* Skip top 4 generated rows */
{
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
@@ -888,22 +965,27 @@ png_push_process_row(png_structp png_ptr)
png_read_push_finish_row(png_ptr);
}
}
break;
}
case 2:
{
int i;
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 4) /* pass 3 might be empty */
if (png_ptr->pass == 4) /* Pass 3 might be empty */
{
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
@@ -911,17 +993,21 @@ png_push_process_row(png_structp png_ptr)
png_read_push_finish_row(png_ptr);
}
}
break;
}
case 3:
{
int i;
for (i = 0; i < 4 && png_ptr->pass == 3; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 4) /* skip top two generated rows */
if (png_ptr->pass == 4) /* Skip top two generated rows */
{
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
@@ -929,49 +1015,61 @@ png_push_process_row(png_structp png_ptr)
png_read_push_finish_row(png_ptr);
}
}
break;
}
case 4:
{
int i;
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 6) /* pass 5 might be empty */
if (png_ptr->pass == 6) /* Pass 5 might be empty */
{
png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
break;
}
case 5:
{
int i;
for (i = 0; i < 2 && png_ptr->pass == 5; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 6) /* skip top generated row */
if (png_ptr->pass == 6) /* Skip top generated row */
{
png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
break;
}
case 6:
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
if (png_ptr->pass != 6)
break;
png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
@@ -989,18 +1087,18 @@ void /* PRIVATE */
png_read_push_finish_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* Offset to next interlace block */
PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
/* Start of interlace block in the y direction */
PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
/* Offset to next interlace block in the y direction */
PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
@@ -1013,6 +1111,7 @@ png_read_push_finish_row(png_structp png_ptr)
if (png_ptr->row_number < png_ptr->num_rows)
return;
#if defined(PNG_READ_INTERLACING_SUPPORTED)
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
@@ -1028,6 +1127,7 @@ png_read_push_finish_row(png_structp png_ptr)
if (png_ptr->pass > 7)
png_ptr->pass--;
if (png_ptr->pass >= 7)
break;
@@ -1049,6 +1149,7 @@ png_read_push_finish_row(png_structp png_ptr)
} while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
}
#endif /* PNG_READ_INTERLACING_SUPPORTED */
}
#if defined(PNG_READ_tEXt_SUPPORTED)
@@ -1059,7 +1160,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place tEXt");
info_ptr = info_ptr; /* to quiet some compiler warnings */
info_ptr = info_ptr; /* To quiet some compiler warnings */
}
#ifdef PNG_MAX_MALLOC_64K
@@ -1091,8 +1192,10 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
if (png_ptr->buffer_size < png_ptr->current_text_left)
text_size = png_ptr->buffer_size;
else
text_size = png_ptr->current_text_left;
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
png_ptr->current_text_left -= text_size;
png_ptr->current_text_ptr += text_size;
@@ -1120,7 +1223,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
key = png_ptr->current_text;
for (text = key; *text; text++)
/* empty loop */ ;
/* Empty loop */ ;
if (text < key + png_ptr->current_text_size)
text++;
@@ -1155,7 +1258,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place zTXt");
info_ptr = info_ptr; /* to quiet some compiler warnings */
info_ptr = info_ptr; /* To quiet some compiler warnings */
}
#ifdef PNG_MAX_MALLOC_64K
@@ -1189,8 +1292,10 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
text_size = png_ptr->buffer_size;
else
text_size = png_ptr->current_text_left;
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
png_ptr->current_text_left -= text_size;
png_ptr->current_text_ptr += text_size;
@@ -1214,7 +1319,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
key = png_ptr->current_text;
for (text = key; *text; text++)
/* empty loop */ ;
/* Empty loop */ ;
/* zTXt can't have zero text */
if (text >= key + png_ptr->current_text_size)
@@ -1226,7 +1331,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
text++;
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */
{
png_ptr->current_text = NULL;
png_free(png_ptr, key);
@@ -1265,11 +1370,15 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
text = (png_charp)png_malloc(png_ptr,
(png_uint_32)(png_ptr->zbuf_size
- png_ptr->zstream.avail_out + key_size + 1));
png_memcpy(text + key_size, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
png_memcpy(text, key, key_size);
text_size = key_size + png_ptr->zbuf_size -
png_ptr->zstream.avail_out;
*(text + text_size) = '\0';
}
else
@@ -1280,10 +1389,13 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
text = (png_charp)png_malloc(png_ptr, text_size +
(png_uint_32)(png_ptr->zbuf_size
- png_ptr->zstream.avail_out + 1));
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) = '\0';
}
@@ -1347,7 +1459,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place iTXt");
info_ptr = info_ptr; /* to quiet some compiler warnings */
info_ptr = info_ptr; /* To quiet some compiler warnings */
}
#ifdef PNG_MAX_MALLOC_64K
@@ -1380,8 +1492,10 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
if (png_ptr->buffer_size < png_ptr->current_text_left)
text_size = png_ptr->buffer_size;
else
text_size = png_ptr->current_text_left;
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
png_ptr->current_text_left -= text_size;
png_ptr->current_text_ptr += text_size;
@@ -1412,23 +1526,25 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
key = png_ptr->current_text;
for (lang = key; *lang; lang++)
/* empty loop */ ;
/* Empty loop */ ;
if (lang < key + png_ptr->current_text_size - 3)
lang++;
comp_flag = *lang++;
lang++; /* skip comp_type, always zero */
lang++; /* Skip comp_type, always zero */
for (lang_key = lang; *lang_key; lang_key++)
/* empty loop */ ;
lang_key++; /* skip NUL separator */
/* Empty loop */ ;
lang_key++; /* Skip NUL separator */
text=lang_key;
if (lang_key < key + png_ptr->current_text_size - 1)
{
for (; *text; text++)
/* empty loop */ ;
/* Empty loop */ ;
}
if (text < key + png_ptr->current_text_size)
@@ -1436,6 +1552,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
text_ptr = (png_textp)png_malloc(png_ptr,
(png_uint_32)png_sizeof(png_text));
text_ptr->compression = comp_flag + 2;
text_ptr->key = key;
text_ptr->lang = lang;
@@ -1477,7 +1594,7 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
#endif
png_chunk_error(png_ptr, "unknown critical chunk");
info_ptr = info_ptr; /* to quiet some compiler warnings */
info_ptr = info_ptr; /* To quiet some compiler warnings */
}
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@@ -1498,23 +1615,28 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
= '\0';
png_ptr->unknown_chunk.size = (png_size_t)length;
if (length == 0)
png_ptr->unknown_chunk.data = NULL;
else
{
png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
(png_uint_32)length);
png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
}
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
if (png_ptr->read_user_chunk_fn != NULL)
{
/* callback to user unknown chunk handler */
/* Callback to user unknown chunk handler */
int ret;
ret = (*(png_ptr->read_user_chunk_fn))
(png_ptr, &png_ptr->unknown_chunk);
if (ret < 0)
png_chunk_error(png_ptr, "error in user chunk");
if (ret == 0)
{
if (!(png_ptr->chunk_name[0] & 0x20))
@@ -1525,12 +1647,14 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
&png_ptr->unknown_chunk, 1);
}
}
else
#endif
png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
png_free(png_ptr, png_ptr->unknown_chunk.data);
png_ptr->unknown_chunk.data = NULL;
}
else
#endif
skip=length;
@@ -1567,7 +1691,9 @@ png_progressive_combine_row (png_structp png_ptr,
PNG_CONST int FARDATA png_pass_dsp_mask[7] =
{0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
#endif
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
}
@@ -1577,7 +1703,9 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
png_progressive_end_ptr end_fn)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->info_fn = info_fn;
png_ptr->row_fn = row_fn;
png_ptr->end_fn = end_fn;
@@ -1588,7 +1716,9 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
png_voidp PNGAPI
png_get_progressive_ptr(png_structp png_ptr)
{
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
return png_ptr->io_ptr;
}
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */

99
pngread.c
View File

@@ -1,7 +1,7 @@
/* pngread.c - read a PNG file
*
* Last changed in libpng 1.2.35 [February 14, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -57,7 +57,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
if (png_ptr == NULL)
return (NULL);
/* added at libpng-1.2.6 */
/* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
@@ -137,7 +137,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
}
}
/* initialize zbuf - compression buffer */
/* 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);
@@ -266,7 +266,7 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
png_debug(1, "in png_read_init_3");
#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
/* Save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
@@ -277,21 +277,21 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
png_ptr = *ptr_ptr;
}
/* reset all variables to 0 */
/* Reset all variables to 0 */
png_memset(png_ptr, 0, png_sizeof(png_struct));
#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
/* Restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
#endif
/* added at libpng-1.2.6 */
/* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
#endif
/* initialize zbuf - compression buffer */
/* 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);
@@ -326,7 +326,8 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
void PNGAPI
png_read_info(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL) return;
if (png_ptr == NULL || info_ptr == NULL)
return;
png_debug(1, "in png_read_info");
/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
@@ -529,12 +530,13 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
}
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
/* optional call to update the users info_ptr structure */
/* Optional call to update the users info_ptr structure */
void PNGAPI
png_read_update_info(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_update_info");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
else
@@ -553,7 +555,8 @@ void PNGAPI
png_start_read_image(png_structp png_ptr)
{
png_debug(1, "in png_start_read_image");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
}
@@ -570,14 +573,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
#endif
int ret;
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_debug2(1, "in png_read_row (row %lu, pass %d)",
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 */
/* 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.");
@@ -609,7 +613,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
}
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* if interlaced and we do not need a new row, combine row and return */
/* 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)
@@ -756,15 +760,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
png_do_read_transformations(png_ptr);
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* blow up interlaced rows to full size */
/* 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);
*/
/* 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)
@@ -823,7 +827,8 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
png_bytepp dp;
png_debug(1, "in png_read_rows");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
rp = row;
dp = display_row;
if (rp != NULL && dp != NULL)
@@ -872,7 +877,8 @@ png_read_image(png_structp png_ptr, png_bytepp image)
png_bytepp rp;
png_debug(1, "in png_read_image");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
#ifdef PNG_READ_INTERLACING_SUPPORTED
pass = png_set_interlace_handling(png_ptr);
@@ -908,7 +914,8 @@ void PNGAPI
png_read_end(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_end");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
do
@@ -1075,7 +1082,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
}
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
/* free all memory used by the read */
/* Free all memory used by the read */
void PNGAPI
png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
png_infopp end_info_ptr_ptr)
@@ -1147,7 +1154,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
}
}
/* free all memory used by the read (old method) */
/* 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)
{
@@ -1296,7 +1303,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
void PNGAPI
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->read_row_fn = read_row_fn;
}
@@ -1310,9 +1318,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
{
int row;
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel from opacity to transparency
/* Invert the alpha channel from opacity to transparency
*/
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
@@ -1328,10 +1337,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
/* -------------- image transformations start here ------------------- */
#if defined(PNG_READ_16_TO_8_SUPPORTED)
/* tell libpng to strip 16 bit/color files down to 8 bits per color
/* Tell libpng to strip 16 bit/color files down to 8 bits per color.
*/
if (transforms & PNG_TRANSFORM_STRIP_16)
png_set_strip_16(png_ptr);
png_set_strip_16(png_ptr);
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
@@ -1339,7 +1348,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* the background (not recommended).
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
png_set_strip_alpha(png_ptr);
png_set_strip_alpha(png_ptr);
#endif
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1347,7 +1356,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
png_set_packing(png_ptr);
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
@@ -1355,7 +1364,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* (not useful if you are using png_set_packing).
*/
if (transforms & PNG_TRANSFORM_PACKSWAP)
png_set_packswap(png_ptr);
png_set_packswap(png_ptr);
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1365,9 +1374,9 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* channels so the data will be available as RGBA quartets.
*/
if (transforms & PNG_TRANSFORM_EXPAND)
if ((png_ptr->bit_depth < 8) ||
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
if ((png_ptr->bit_depth < 8) ||
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
png_set_expand(png_ptr);
#endif
@@ -1375,10 +1384,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
*/
#if defined(PNG_READ_INVERT_SUPPORTED)
/* invert monochrome files to have 0 as white and 1 as black
/* Invert monochrome files to have 0 as white and 1 as black
*/
if (transforms & PNG_TRANSFORM_INVERT_MONO)
png_set_invert_mono(png_ptr);
png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED)
@@ -1397,24 +1406,24 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
#endif
#if defined(PNG_READ_BGR_SUPPORTED)
/* flip the RGB pixels to BGR (or RGBA to BGRA)
/* Flip the RGB pixels to BGR (or RGBA to BGRA)
*/
if (transforms & PNG_TRANSFORM_BGR)
png_set_bgr(png_ptr);
png_set_bgr(png_ptr);
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
/* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
*/
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_READ_SWAP_SUPPORTED)
/* swap bytes of 16 bit files to least significant byte first
/* Swap bytes of 16 bit files to least significant byte first
*/
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
png_set_swap(png_ptr);
png_set_swap(png_ptr);
#endif
/* We don't handle adding filler bytes */
@@ -1447,10 +1456,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
/* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
transforms = transforms; /* quiet compiler warnings */
transforms = transforms; /* Quiet compiler warnings */
params = params;
}

58
pngrio.c
View File

@@ -1,7 +1,7 @@
/* pngrio.c - functions for data input
*
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -20,10 +20,11 @@
#if defined(PNG_READ_SUPPORTED)
/* Read the data from whatever input you are using. The default routine
reads from a file pointer. Note that this routine sometimes gets called
with very small lengths, so you should implement some kind of simple
buffering if you are using unbuffered reads. This should never be asked
to read more then 64K on a 16 bit machine. */
* reads from a file pointer. Note that this routine sometimes gets called
* with very small lengths, so you should implement some kind of simple
* buffering if you are using unbuffered reads. This should never be asked
* to read more then 64K on a 16 bit machine.
*/
void /* PRIVATE */
png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
@@ -36,16 +37,18 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
#if !defined(PNG_NO_STDIO)
/* This is the function that does the actual reading of data. If you are
not reading from a standard C stream, you should create a replacement
read_data function and use it at run time with png_set_read_fn(), rather
than changing the library. */
* not reading from a standard C stream, you should create a replacement
* read_data function and use it at run time with png_set_read_fn(), rather
* than changing the library.
*/
#ifndef USE_FAR_KEYWORD
void PNGAPI
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_size_t check;
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
/* fread() returns 0 on error, so it is OK to store this in a png_size_t
* instead of an int, which is what fread() actually returns.
*/
@@ -61,7 +64,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
png_error(png_ptr, "Read Error");
}
#else
/* this is the model-independent version. Since the standard I/O library
/* This is the model-independent version. Since the standard I/O library
can't handle far buffers in the medium and small models, we have to copy
the data.
*/
@@ -76,7 +79,8 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
png_byte *n_data;
png_FILE_p io_ptr;
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
/* Check if data really is near. If so, use usual code. */
n_data = (png_byte *)CVT_PTR_NOCHECK(data);
io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -121,25 +125,27 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
#endif
/* This function allows the application to supply a new input function
for libpng if standard C streams aren't being used.
This function takes as its arguments:
png_ptr - pointer to a png input data structure
io_ptr - pointer to user supplied structure containing info about
the input functions. May be NULL.
read_data_fn - pointer to a new input function that takes as its
arguments a pointer to a png_struct, a pointer to
a location where input data can be stored, and a 32-bit
unsigned int that is the number of bytes to be read.
To exit and output any fatal error messages the new write
function should call png_error(png_ptr, "Error msg").
May be NULL, in which case libpng's default function will
be used. */
* for libpng if standard C streams aren't being used.
*
* This function takes as its arguments:
* png_ptr - pointer to a png input data structure
* io_ptr - pointer to user supplied structure containing info about
* the input functions. May be NULL.
* read_data_fn - pointer to a new input function that takes as its
* arguments a pointer to a png_struct, a pointer to
* a location where input data can be stored, and a 32-bit
* unsigned int that is the number of bytes to be read.
* To exit and output any fatal error messages the new write
* function should call png_error(png_ptr, "Error msg").
* May be NULL, in which case libpng's default function will
* be used.
*/
void PNGAPI
png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
png_rw_ptr read_data_fn)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->io_ptr = io_ptr;
#if !defined(PNG_NO_STDIO)

384
pngrtran.c
View File

File diff suppressed because it is too large Load Diff

189
pngrutil.c
View File

@@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.2.37 [May 13, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -21,7 +21,7 @@
#ifdef PNG_FLOATING_POINT_SUPPORTED
# if defined(WIN32_WCE_OLD)
/* strtod() function is not supported on WindowsCE */
/* The strtod() function is not supported on WindowsCE */
__inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr, char **endptr)
{
double result = 0;
@@ -76,7 +76,8 @@ png_get_uint_32(png_bytep buf)
/* 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. */
* assumed that the machine format for signed integers is the same.
*/
png_int_32 PNGAPI
png_get_int_32(png_bytep buf)
{
@@ -108,21 +109,21 @@ png_read_chunk_header(png_structp png_ptr)
png_byte buf[8];
png_uint_32 length;
/* read the length and the chunk name */
/* Read the length and the chunk name */
png_read_data(png_ptr, buf, 8);
length = png_get_uint_31(png_ptr, buf);
/* put the chunk name into png_ptr->chunk_name */
/* Put the chunk name into png_ptr->chunk_name */
png_memcpy(png_ptr->chunk_name, buf + 4, 4);
png_debug2(0, "Reading %s chunk, length = %lu",
png_ptr->chunk_name, length);
/* reset the crc and run it over the chunk name */
/* Reset the crc and run it over the chunk name */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
/* check to see if chunk name is valid */
/* Check to see if chunk name is valid */
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
return length;
@@ -132,15 +133,17 @@ png_read_chunk_header(png_structp png_ptr)
void /* PRIVATE */
png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
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. */
* 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)
{
@@ -159,7 +162,7 @@ png_crc_finish(png_structp png_ptr, png_uint_32 skip)
if (png_crc_error(png_ptr))
{
if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
(!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
(png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
{
@@ -176,7 +179,8 @@ png_crc_finish(png_structp png_ptr, png_uint_32 skip)
}
/* Compare the CRC stored in the PNG file with that calculated by libpng from
the data it has read thus far. */
* the data it has read thus far.
*/
int /* PRIVATE */
png_crc_error(png_structp png_ptr)
{
@@ -331,14 +335,17 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
png_snprintf(umsg, 52,
"Buffer error in compressed datastream in %s chunk",
png_ptr->chunk_name);
else if (ret == Z_DATA_ERROR)
png_snprintf(umsg, 52,
"Data error in compressed datastream in %s chunk",
png_ptr->chunk_name);
else
png_snprintf(umsg, 52,
"Incomplete compressed datastream in %s chunk",
png_ptr->chunk_name);
png_warning(png_ptr, umsg);
#else
png_warning(png_ptr,
@@ -383,7 +390,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
}
#endif
/* read and check the IDHR chunk */
/* Read and check the IDHR chunk */
void /* PRIVATE */
png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
@@ -397,7 +404,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
if (png_ptr->mode & PNG_HAVE_IHDR)
png_error(png_ptr, "Out of place IHDR");
/* check the length */
/* Check the length */
if (length != 13)
png_error(png_ptr, "Invalid IHDR chunk");
@@ -414,7 +421,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
filter_type = buf[11];
interlace_type = buf[12];
/* set internal variables */
/* Set internal variables */
png_ptr->width = width;
png_ptr->height = height;
png_ptr->bit_depth = (png_byte)bit_depth;
@@ -425,25 +432,28 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
png_ptr->compression_type = (png_byte)compression_type;
/* find number of channels */
/* 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 */
/* Set up other useful info */
png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
png_ptr->channels);
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
@@ -454,7 +464,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
color_type, interlace_type, compression_type, filter_type);
}
/* read and check the palette */
/* Read and check the palette */
void /* PRIVATE */
png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
@@ -468,12 +478,14 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
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");
@@ -502,6 +514,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else
{
png_error(png_ptr, "Invalid palette chunk");
@@ -526,7 +539,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_byte buf[3];
png_crc_read(png_ptr, buf, 3);
/* don't depend upon png_color being any order */
/* Don't depend upon png_color being any order */
palette[i].red = buf[0];
palette[i].green = buf[1];
palette[i].blue = buf[2];
@@ -534,9 +547,10 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#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. */
* 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
@@ -611,7 +625,7 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
png_crc_finish(png_ptr, length);
info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
}
#if defined(PNG_READ_gAMA_SUPPORTED)
@@ -661,7 +675,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
igamma = (png_fixed_point)png_get_uint_32(buf);
/* check for zero gamma */
/* Check for zero gamma */
if (igamma == 0)
{
png_warning(png_ptr,
@@ -925,7 +939,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
intent = buf[0];
/* check for bad intent */
/* Check for bad intent */
if (intent >= PNG_sRGB_INTENT_LAST)
{
png_warning(png_ptr, "Unknown sRGB intent");
@@ -1040,12 +1054,13 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->chunkdata[slength] = 0x00;
for (profile = png_ptr->chunkdata; *profile; profile++)
/* empty loop to find end of name */ ;
/* 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 */
/* There should be at least one zero (the compression type byte)
* following the separator, and we should be on it
*/
if ( profile >= png_ptr->chunkdata + slength - 1)
{
png_free(png_ptr, png_ptr->chunkdata);
@@ -1054,7 +1069,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
}
/* compression_type should always be zero */
/* Compression_type should always be zero */
compression_type = *profile++;
if (compression_type)
{
@@ -1152,10 +1167,10 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->chunkdata[slength] = 0x00;
for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; entry_start++)
/* empty loop to find end of name */ ;
/* Empty loop to find end of name */ ;
++entry_start;
/* a sample depth should follow the separator, and we should be on it */
/* A sample depth should follow the separator, and we should be on it */
if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
{
png_free(png_ptr, png_ptr->chunkdata);
@@ -1168,7 +1183,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
entry_size = (new_palette.depth == 8 ? 6 : 10);
data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
/* integrity-check the data length */
/* Integrity-check the data length */
if (data_length % entry_size)
{
png_free(png_ptr, png_ptr->chunkdata);
@@ -1236,7 +1251,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
#endif
/* discard all chunk data except the name and stash that */
/* Discard all chunk data except the name and stash that */
new_palette.name = png_ptr->chunkdata;
png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
@@ -1572,7 +1587,7 @@ png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
/* read the pCAL chunk (described in the PNG Extensions document) */
/* 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)
{
@@ -1619,11 +1634,11 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
}
png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
png_debug(3, "Finding end of pCAL purpose string");
for (buf = png_ptr->chunkdata; *buf; buf++)
/* empty loop */ ;
/* Empty loop */ ;
endptr = png_ptr->chunkdata + slength;
@@ -1706,7 +1721,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
/* read the sCAL chunk */
/* Read the sCAL chunk */
void /* PRIVATE */
png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
@@ -1756,9 +1771,9 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
}
png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
ep = png_ptr->chunkdata + 1; /* skip unit byte */
ep = png_ptr->chunkdata + 1; /* Skip unit byte */
#ifdef PNG_FLOATING_POINT_SUPPORTED
width = png_strtod(png_ptr, ep, &vp);
@@ -1780,7 +1795,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
for (ep = png_ptr->chunkdata; *ep; ep++)
/* empty loop */ ;
/* Empty loop */ ;
ep++;
if (png_ptr->chunkdata + slength < ep)
@@ -1944,7 +1959,7 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
key[slength] = 0x00;
for (text = key; *text; text++)
/* empty loop to find end of key */ ;
/* Empty loop to find end of key */ ;
if (text != key + slength)
text++;
@@ -1979,7 +1994,7 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
/* note: this does not correctly handle chunks that are > 64K under DOS */
/* 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)
{
@@ -2028,7 +2043,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->chunkdata[slength] = 0x00;
for (text = png_ptr->chunkdata; *text; text++)
/* empty loop */ ;
/* Empty loop */ ;
/* zTXt must have some text after the chunkdataword */
if (text >= png_ptr->chunkdata + slength - 2)
@@ -2046,7 +2061,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_warning(png_ptr, "Unknown compression type in zTXt chunk");
comp_type = PNG_TEXT_COMPRESSION_zTXt;
}
text++; /* skip the compression_method byte */
text++; /* Skip the compression_method byte */
}
prefix_len = text - png_ptr->chunkdata;
@@ -2083,7 +2098,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
/* note: this does not correctly handle chunks that are > 64K under DOS */
/* 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)
{
@@ -2133,12 +2148,13 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->chunkdata[slength] = 0x00;
for (lang = png_ptr->chunkdata; *lang; lang++)
/* empty loop */ ;
lang++; /* skip NUL separator */
/* 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 */
* translated keyword (possibly empty), and possibly some text after the
* keyword
*/
if (lang >= png_ptr->chunkdata + slength - 3)
{
@@ -2154,8 +2170,8 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
for (lang_key = lang; *lang_key; lang_key++)
/* empty loop */ ;
lang_key++; /* skip NUL separator */
/* Empty loop */ ;
lang_key++; /* Skip NUL separator */
if (lang_key >= png_ptr->chunkdata + slength)
{
@@ -2166,8 +2182,8 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
for (text = lang_key; *text; text++)
/* empty loop */ ;
text++; /* skip NUL separator */
/* Empty loop */ ;
text++; /* Skip NUL separator */
if (text >= png_ptr->chunkdata + slength)
{
png_warning(png_ptr, "Malformed iTXt chunk");
@@ -2229,7 +2245,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_CONST PNG_IDAT;
#endif
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */
png_ptr->mode |= PNG_AFTER_IDAT;
}
@@ -2273,7 +2289,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
if (png_ptr->read_user_chunk_fn != NULL)
{
/* callback to user unknown chunk handler */
/* Callback to user unknown chunk handler */
int ret;
ret = (*(png_ptr->read_user_chunk_fn))
(png_ptr, &png_ptr->unknown_chunk);
@@ -2302,7 +2318,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 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 */
info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
#endif
}
@@ -2550,8 +2566,8 @@ png_do_read_interlace(png_structp png_ptr)
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 */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Offset to next interlace block */
PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
#endif
@@ -2759,7 +2775,7 @@ png_do_read_interlace(png_structp png_ptr)
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
}
#if !defined(PNG_READ_PACKSWAP_SUPPORTED)
transformations = transformations; /* silence compiler warning */
transformations = transformations; /* Silence compiler warning */
#endif
}
#endif /* PNG_READ_INTERLACING_SUPPORTED */
@@ -2843,7 +2859,7 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
rp++;
}
for (i = 0; i < istop; i++) /* use leftover rp,pp */
for (i = 0; i < istop; i++) /* Use leftover rp,pp */
{
int a, b, c, pa, pb, pc, p;
@@ -2887,23 +2903,24 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
}
}
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
void /* PRIVATE */
png_read_finish_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
#ifdef PNG_READ_INTERLACING_SUPPORTED
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* Offset to next interlace block */
PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
/* Start of interlace block in the y direction */
PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
/* Offset to next interlace block in the y direction */
PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif /* PNG_READ_INTERLACING_SUPPORTED */
#endif
@@ -3018,24 +3035,25 @@ png_read_finish_row(png_structp png_ptr)
png_ptr->mode |= PNG_AFTER_IDAT;
}
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
void /* PRIVATE */
png_read_start_row(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
#ifdef PNG_READ_INTERLACING_SUPPORTED
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* Offset to next interlace block */
PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
/* Start of interlace block in the y direction */
PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
/* Offset to next interlace block in the y direction */
PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
#endif
@@ -3172,11 +3190,13 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
}
#endif
/* align the width on the next larger 8 pixels. Mainly used
for interlacing */
/* 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 */
/* Calculate the maximum bytes needed, adding a byte and a pixel
* for safety's sake
*/
row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
1 + ((max_pixel_depth + 7) >> 3);
#ifdef PNG_MAX_MALLOC_64K
@@ -3187,7 +3207,7 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
if (row_bytes + 64 > png_ptr->old_big_row_buf_size)
{
png_free(png_ptr, png_ptr->big_row_buf);
png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 64);
png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 64);
if (png_ptr->interlaced)
png_memset(png_ptr->big_row_buf, 0, row_bytes + 64);
png_ptr->row_buf = png_ptr->big_row_buf + 32;
@@ -3195,21 +3215,22 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
}
#ifdef PNG_MAX_MALLOC_64K
if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
if ((png_uint_32)row_bytes + 1 > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
if ((png_uint_32)row_bytes > (png_uint_32)(PNG_SIZE_MAX - 1))
png_error(png_ptr, "Row has too many bytes to allocate in memory.");
if (png_ptr->rowbytes+1 > png_ptr->old_prev_row_size)
if (row_bytes + 1 > png_ptr->old_prev_row_size)
{
png_free(png_ptr, png_ptr->prev_row);
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
png_ptr->rowbytes + 1));
png_ptr->old_prev_row_size = png_ptr->rowbytes+1;
png_free(png_ptr, png_ptr->prev_row);
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
row_bytes + 1));
png_memset_check(png_ptr, png_ptr->prev_row, 0, row_bytes + 1);
png_ptr->old_prev_row_size = row_bytes + 1;
}
png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_ptr->rowbytes = row_bytes;
png_debug1(3, "width = %lu,", png_ptr->width);
png_debug1(3, "height = %lu,", png_ptr->height);

452
pngset.c
View File

@@ -1,7 +1,7 @@
/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -79,25 +79,25 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
#endif
{
info_ptr->int_x_white = white_x;
info_ptr->int_y_white = white_y;
info_ptr->int_x_red = red_x;
info_ptr->int_y_red = red_y;
info_ptr->int_x_green = green_x;
info_ptr->int_y_green = green_y;
info_ptr->int_x_blue = blue_x;
info_ptr->int_y_blue = blue_y;
#ifdef PNG_FLOATING_POINT_SUPPORTED
info_ptr->x_white = (float)(white_x/100000.);
info_ptr->y_white = (float)(white_y/100000.);
info_ptr->x_red = (float)( red_x/100000.);
info_ptr->y_red = (float)( red_y/100000.);
info_ptr->x_green = (float)(green_x/100000.);
info_ptr->y_green = (float)(green_y/100000.);
info_ptr->x_blue = (float)( blue_x/100000.);
info_ptr->y_blue = (float)( blue_y/100000.);
info_ptr->int_x_white = white_x;
info_ptr->int_y_white = white_y;
info_ptr->int_x_red = red_x;
info_ptr->int_y_red = red_y;
info_ptr->int_x_green = green_x;
info_ptr->int_y_green = green_y;
info_ptr->int_x_blue = blue_x;
info_ptr->int_y_blue = blue_y;
#ifdef PNG_FLOATING_POINT_SUPPORTED
info_ptr->x_white = (float)(white_x/100000.);
info_ptr->y_white = (float)(white_y/100000.);
info_ptr->x_red = (float)( red_x/100000.);
info_ptr->y_red = (float)( red_y/100000.);
info_ptr->x_green = (float)(green_x/100000.);
info_ptr->y_green = (float)(green_y/100000.);
info_ptr->x_blue = (float)( blue_x/100000.);
info_ptr->y_blue = (float)( blue_y/100000.);
#endif
info_ptr->valid |= PNG_INFO_cHRM;
info_ptr->valid |= PNG_INFO_cHRM;
}
}
#endif /* PNG_FIXED_POINT_SUPPORTED */
@@ -140,20 +140,20 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
if (png_ptr == NULL || info_ptr == NULL)
return;
if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX)
{
png_warning(png_ptr, "Limiting gamma to 21474.83");
png_gamma=PNG_UINT_31_MAX;
png_warning(png_ptr, "Limiting gamma to 21474.83");
png_gamma=PNG_UINT_31_MAX;
}
else
{
if (int_gamma < 0)
{
png_warning(png_ptr, "Setting negative gamma to zero");
png_gamma = 0;
}
else
png_gamma = int_gamma;
if (int_gamma < 0)
{
png_warning(png_ptr, "Setting negative gamma to zero");
png_gamma = 0;
}
else
png_gamma = int_gamma;
}
#ifdef PNG_FLOATING_POINT_SUPPORTED
info_ptr->gamma = (float)(png_gamma/100000.);
@@ -179,26 +179,27 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
if (info_ptr->num_palette == 0 || info_ptr->num_palette
> PNG_MAX_PALETTE_LENGTH)
{
png_warning(png_ptr,
"Invalid palette size, hIST allocation skipped.");
return;
png_warning(png_ptr,
"Invalid palette size, hIST allocation skipped.");
return;
}
#ifdef PNG_FREE_ME_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
#endif
/* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
1.2.1 */
/* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
* version 1.2.1
*/
png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
(png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
if (png_ptr->hist == NULL)
{
png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
return;
}
{
png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
return;
}
for (i = 0; i < info_ptr->num_palette; i++)
png_ptr->hist[i] = hist[i];
png_ptr->hist[i] = hist[i];
info_ptr->hist = png_ptr->hist;
info_ptr->valid |= PNG_INFO_hIST;
@@ -220,7 +221,7 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
if (png_ptr == NULL || info_ptr == NULL)
return;
/* check for width and height valid values */
/* Check for width and height valid values */
if (width == 0 || height == 0)
png_error(png_ptr, "Image width or height is zero in IHDR");
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
@@ -240,13 +241,13 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
- 8) /* extra max_pixel_depth pad */
png_warning(png_ptr, "Width is too large for libpng to process pixels");
/* check other values */
/* 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)
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) ||
@@ -276,9 +277,9 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
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 ||
(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)
@@ -306,7 +307,7 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
info_ptr->channels++;
info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
/* check for potential overflow */
/* Check for potential overflow */
if (width > (PNG_UINT_32_MAX
>> 3) /* 8-byte RGBA pixels */
- 64 /* bigrowbuf hack */
@@ -496,15 +497,15 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
return;
if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
{
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
png_error(png_ptr, "Invalid palette length");
else
{
else
{
png_warning(png_ptr, "Invalid palette length");
return;
}
}
}
}
/*
* It may not actually be necessary to set png_ptr->palette here;
@@ -516,8 +517,9 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
#endif
/* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
of num_palette entries,
in case of an invalid PNG file that has too-large sample values. */
* of num_palette entries, in case of an invalid PNG file that has
* too-large sample values.
*/
png_ptr->palette = (png_colorp)png_malloc(png_ptr,
PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
@@ -620,18 +622,18 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
#if !defined(PNG_NO_CHECK_cHRM)
if (png_check_cHRM_fixed(png_ptr,
int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
int_green_y, int_blue_x, int_blue_y))
int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
int_green_y, int_blue_x, int_blue_y))
#endif
{
#ifdef PNG_FIXED_POINT_SUPPORTED
png_set_cHRM_fixed(png_ptr, info_ptr,
int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
int_green_y, int_blue_x, int_blue_y);
png_set_cHRM_fixed(png_ptr, info_ptr,
int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
int_green_y, int_blue_x, int_blue_y);
#endif
#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);
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
#endif
}
#endif /* cHRM */
@@ -689,17 +691,17 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
#if defined(PNG_TEXT_SUPPORTED)
void PNGAPI
png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
int num_text)
int num_text)
{
int ret;
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
if (ret)
png_error(png_ptr, "Insufficient memory to store text");
png_error(png_ptr, "Insufficient memory to store text");
}
int /* PRIVATE */
png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
int num_text)
int num_text)
{
int i;
@@ -725,10 +727,10 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
(png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
if (info_ptr->text == NULL)
{
png_free(png_ptr, old_text);
return(1);
}
{
png_free(png_ptr, old_text);
return(1);
}
png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
png_sizeof(png_text)));
png_free(png_ptr, old_text);
@@ -740,7 +742,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
(png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
if (info_ptr->text == NULL)
return(1);
return(1);
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_TEXT;
#endif
@@ -761,26 +763,26 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
if (text_ptr[i].compression <= 0)
{
lang_len = 0;
lang_key_len = 0;
lang_len = 0;
lang_key_len = 0;
}
else
#ifdef PNG_iTXt_SUPPORTED
{
/* set iTXt data */
if (text_ptr[i].lang != NULL)
lang_len = png_strlen(text_ptr[i].lang);
else
lang_len = 0;
if (text_ptr[i].lang_key != NULL)
lang_key_len = png_strlen(text_ptr[i].lang_key);
else
lang_key_len = 0;
/* Set iTXt data */
if (text_ptr[i].lang != NULL)
lang_len = png_strlen(text_ptr[i].lang);
else
lang_len = 0;
if (text_ptr[i].lang_key != NULL)
lang_key_len = png_strlen(text_ptr[i].lang_key);
else
lang_key_len = 0;
}
#else
{
png_warning(png_ptr, "iTXt chunk not supported.");
continue;
png_warning(png_ptr, "iTXt chunk not supported.");
continue;
}
#endif
@@ -804,14 +806,13 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
(png_uint_32)
(key_len + text_length + lang_len + lang_key_len + 4));
if (textp->key == NULL)
return(1);
return(1);
png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
(png_uint_32)
(key_len + lang_len + lang_key_len + text_length + 4),
(int)textp->key);
(png_uint_32)
(key_len + lang_len + lang_key_len + text_length + 4),
(int)textp->key);
png_memcpy(textp->key, text_ptr[i].key,
(png_size_t)(key_len));
png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
*(textp->key + key_len) = '\0';
#ifdef PNG_iTXt_SUPPORTED
if (text_ptr[i].compression > 0)
@@ -898,7 +899,7 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
(png_uint_32)PNG_MAX_PALETTE_LENGTH);
if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
}
if (trans_values != NULL)
@@ -910,12 +911,12 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
((int)trans_values->red > sample_max ||
(int)trans_values->green > sample_max ||
(int)trans_values->blue > sample_max)))
png_warning(png_ptr,
"tRNS chunk has out-of-range samples for bit_depth");
png_warning(png_ptr,
"tRNS chunk has out-of-range samples for bit_depth");
png_memcpy(&(info_ptr->trans_values), trans_values,
png_sizeof(png_color_16));
if (num_trans == 0)
num_trans = 1;
num_trans = 1;
}
info_ptr->num_trans = (png_uint_16)num_trans;
@@ -943,62 +944,62 @@ png_set_sPLT(png_structp png_ptr,
* added.
*/
{
png_sPLT_tp np;
int i;
png_sPLT_tp np;
int i;
if (png_ptr == NULL || info_ptr == NULL)
return;
np = (png_sPLT_tp)png_malloc_warn(png_ptr,
(info_ptr->splt_palettes_num + nentries) *
(png_uint_32)png_sizeof(png_sPLT_t));
if (np == NULL)
{
png_warning(png_ptr, "No memory for sPLT palettes.");
if (png_ptr == NULL || info_ptr == NULL)
return;
}
png_memcpy(np, info_ptr->splt_palettes,
info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
png_free(png_ptr, info_ptr->splt_palettes);
info_ptr->splt_palettes=NULL;
np = (png_sPLT_tp)png_malloc_warn(png_ptr,
(info_ptr->splt_palettes_num + nentries) *
(png_uint_32)png_sizeof(png_sPLT_t));
if (np == NULL)
{
png_warning(png_ptr, "No memory for sPLT palettes.");
return;
}
for (i = 0; i < nentries; i++)
{
png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
png_sPLT_tp from = entries + i;
png_uint_32 length;
png_memcpy(np, info_ptr->splt_palettes,
info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
png_free(png_ptr, info_ptr->splt_palettes);
info_ptr->splt_palettes=NULL;
length = png_strlen(from->name) + 1;
for (i = 0; i < nentries; i++)
{
png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
png_sPLT_tp from = entries + i;
png_uint_32 length;
length = png_strlen(from->name) + 1;
to->name = (png_charp)png_malloc_warn(png_ptr, length);
if (to->name == NULL)
{
png_warning(png_ptr,
"Out of memory while processing sPLT chunk");
continue;
}
png_memcpy(to->name, from->name, length);
to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
if (to->name == NULL)
{
png_warning(png_ptr,
"Out of memory while processing sPLT chunk");
continue;
}
png_memcpy(to->name, from->name, length);
to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
(png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));
if (to->entries == NULL)
{
png_warning(png_ptr,
"Out of memory while processing sPLT chunk");
png_free(png_ptr, to->name);
to->name = NULL;
continue;
}
png_memcpy(to->entries, from->entries,
from->nentries * png_sizeof(png_sPLT_entry));
to->nentries = from->nentries;
to->depth = from->depth;
}
if (to->entries == NULL)
{
png_warning(png_ptr,
"Out of memory while processing sPLT chunk");
png_free(png_ptr, to->name);
to->name = NULL;
continue;
}
png_memcpy(to->entries, from->entries,
from->nentries * png_sizeof(png_sPLT_entry));
to->nentries = from->nentries;
to->depth = from->depth;
}
info_ptr->splt_palettes = np;
info_ptr->splt_palettes_num += nentries;
info_ptr->valid |= PNG_INFO_sPLT;
info_ptr->splt_palettes = np;
info_ptr->splt_palettes_num += nentries;
info_ptr->valid |= PNG_INFO_sPLT;
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_SPLT;
info_ptr->free_me |= PNG_FREE_SPLT;
#endif
}
#endif /* PNG_sPLT_SUPPORTED */
@@ -1008,61 +1009,61 @@ void PNGAPI
png_set_unknown_chunks(png_structp png_ptr,
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
{
png_unknown_chunkp np;
int i;
png_unknown_chunkp np;
int i;
if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
return;
np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
(png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
png_sizeof(png_unknown_chunk)));
if (np == NULL)
{
png_warning(png_ptr,
"Out of memory while processing unknown chunk.");
if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
return;
}
png_memcpy(np, info_ptr->unknown_chunks,
info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks=NULL;
np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
(png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
png_sizeof(png_unknown_chunk)));
if (np == NULL)
{
png_warning(png_ptr,
"Out of memory while processing unknown chunk.");
return;
}
for (i = 0; i < num_unknowns; i++)
{
png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
png_unknown_chunkp from = unknowns + i;
png_memcpy(np, info_ptr->unknown_chunks,
info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks=NULL;
png_memcpy((png_charp)to->name,
(png_charp)from->name,
png_sizeof(from->name));
to->name[png_sizeof(to->name)-1] = '\0';
to->size = from->size;
/* note our location in the read or write sequence */
to->location = (png_byte)(png_ptr->mode & 0xff);
for (i = 0; i < num_unknowns; i++)
{
png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
png_unknown_chunkp from = unknowns + i;
if (from->size == 0)
to->data=NULL;
else
{
to->data = (png_bytep)png_malloc_warn(png_ptr,
(png_uint_32)from->size);
if (to->data == NULL)
{
png_warning(png_ptr,
"Out of memory while processing unknown chunk.");
to->size = 0;
}
else
png_memcpy(to->data, from->data, from->size);
}
}
png_memcpy((png_charp)to->name,
(png_charp)from->name,
png_sizeof(from->name));
to->name[png_sizeof(to->name)-1] = '\0';
to->size = from->size;
/* Note our location in the read or write sequence */
to->location = (png_byte)(png_ptr->mode & 0xff);
info_ptr->unknown_chunks = np;
info_ptr->unknown_chunks_num += num_unknowns;
if (from->size == 0)
to->data=NULL;
else
{
to->data = (png_bytep)png_malloc_warn(png_ptr,
(png_uint_32)from->size);
if (to->data == NULL)
{
png_warning(png_ptr,
"Out of memory while processing unknown chunk.");
to->size = 0;
}
else
png_memcpy(to->data, from->data, from->size);
}
}
info_ptr->unknown_chunks = np;
info_ptr->unknown_chunks_num += num_unknowns;
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_UNKN;
info_ptr->free_me |= PNG_FREE_UNKN;
#endif
}
void PNGAPI
@@ -1111,44 +1112,44 @@ void PNGAPI
png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
chunk_list, int num_chunks)
{
png_bytep new_list, p;
int i, old_num_chunks;
if (png_ptr == NULL)
return;
if (num_chunks == 0)
{
png_bytep new_list, p;
int i, old_num_chunks;
if (png_ptr == NULL)
return;
if (num_chunks == 0)
{
if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
else
png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
if (keep == PNG_HANDLE_CHUNK_ALWAYS)
png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
else
png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
return;
}
if (chunk_list == NULL)
}
if (chunk_list == NULL)
return;
old_num_chunks = png_ptr->num_chunk_list;
new_list=(png_bytep)png_malloc(png_ptr,
(png_uint_32)
(5*(num_chunks + old_num_chunks)));
if (png_ptr->chunk_list != NULL)
{
png_memcpy(new_list, png_ptr->chunk_list,
(png_size_t)(5*old_num_chunks));
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list=NULL;
}
png_memcpy(new_list + 5*old_num_chunks, chunk_list,
(png_size_t)(5*num_chunks));
for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
*p=(png_byte)keep;
png_ptr->num_chunk_list = old_num_chunks + num_chunks;
png_ptr->chunk_list = new_list;
old_num_chunks = png_ptr->num_chunk_list;
new_list=(png_bytep)png_malloc(png_ptr,
(png_uint_32)
(5*(num_chunks + old_num_chunks)));
if (png_ptr->chunk_list != NULL)
{
png_memcpy(new_list, png_ptr->chunk_list,
(png_size_t)(5*old_num_chunks));
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list=NULL;
}
png_memcpy(new_list + 5*old_num_chunks, chunk_list,
(png_size_t)(5*num_chunks));
for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
*p=(png_byte)keep;
png_ptr->num_chunk_list = old_num_chunks + num_chunks;
png_ptr->chunk_list = new_list;
#ifdef PNG_FREE_ME_SUPPORTED
png_ptr->free_me |= PNG_FREE_LIST;
png_ptr->free_me |= PNG_FREE_LIST;
#endif
}
#endif
@@ -1208,7 +1209,7 @@ png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
#ifndef PNG_1_0_X
#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
/* function was added to libpng 1.2.0 and should always exist by default */
/* Function was added to libpng 1.2.0 and should always exist by default */
void PNGAPI
png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
{
@@ -1218,7 +1219,7 @@ png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
asm_flags = asm_flags; /* Quiet the compiler */
}
/* this function was added to libpng 1.2.0 */
/* This function was added to libpng 1.2.0 */
void PNGAPI
png_set_mmx_thresholds (png_structp png_ptr,
png_byte mmx_bitdepth_threshold,
@@ -1234,18 +1235,19 @@ png_set_mmx_thresholds (png_structp png_ptr,
#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
/* this function was added to libpng 1.2.6 */
/* This function was added to libpng 1.2.6 */
void PNGAPI
png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
png_uint_32 user_height_max)
{
/* Images with dimensions larger than these limits will be
* rejected by png_set_IHDR(). To accept any PNG datastream
* regardless of dimensions, set both limits to 0x7ffffffL.
*/
if (png_ptr == NULL) return;
png_ptr->user_width_max = user_width_max;
png_ptr->user_height_max = user_height_max;
/* Images with dimensions larger than these limits will be
* rejected by png_set_IHDR(). To accept any PNG datastream
* regardless of dimensions, set both limits to 0x7ffffffL.
*/
if (png_ptr == NULL)
return;
png_ptr->user_width_max = user_width_max;
png_ptr->user_height_max = user_height_max;
}
#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */

339
pngtest.c
View File

@@ -1,7 +1,7 @@
/* pngtest.c - a simple test program to test libpng
*
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -65,7 +65,7 @@
#endif
#if !PNG_DEBUG
# define SINGLE_ROWBUF_ALLOC /* makes buffer overruns easier to nail */
# define SINGLE_ROWBUF_ALLOC /* Makes buffer overruns easier to nail */
#endif
/* Turn on CPU timing
@@ -95,9 +95,9 @@ int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
#include <mem.h>
#endif
/* defined so I can write to a file on gui/windowing platforms */
/* Defined so I can write to a file on gui/windowing platforms */
/* #define STDERR stderr */
#define STDERR stdout /* for DOS */
#define STDERR stdout /* For DOS */
/* In case a system header (e.g., on AIX) defined jmpbuf */
#ifdef jmpbuf
@@ -109,7 +109,7 @@ int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
# define png_jmpbuf(png_ptr) png_ptr->jmpbuf
#endif
/* example of using row callbacks to make a simple progress meter */
/* Example of using row callbacks to make a simple progress meter */
static int status_pass = 1;
static int status_dots_requested = 0;
static int status_dots = 1;
@@ -125,20 +125,21 @@ PNGAPI
#endif
read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
{
if (png_ptr == NULL || row_number > PNG_UINT_31_MAX) return;
if (status_pass != pass)
{
fprintf(stdout, "\n Pass %d: ", pass);
status_pass = pass;
status_dots = 31;
}
status_dots--;
if (status_dots == 0)
{
fprintf(stdout, "\n ");
status_dots=30;
}
fprintf(stdout, "r");
if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
return;
if (status_pass != pass)
{
fprintf(stdout, "\n Pass %d: ", pass);
status_pass = pass;
status_dots = 31;
}
status_dots--;
if (status_dots == 0)
{
fprintf(stdout, "\n ");
status_dots=30;
}
fprintf(stdout, "r");
}
void
@@ -152,15 +153,17 @@ PNGAPI
#endif
write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
{
if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7) return;
fprintf(stdout, "w");
if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
return;
fprintf(stdout, "w");
}
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
/* Example of using user transform callback (we don't transform anything,
but merely examine the row filters. We set this to 256 rather than
5 in case illegal filter values are present.) */
* but merely examine the row filters. We set this to 256 rather than
* 5 in case illegal filter values are present.)
*/
static png_uint_32 filters_used[256];
void
#ifdef PNG_1_0_X
@@ -173,14 +176,15 @@ PNGAPI
#endif
count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
{
if (png_ptr != NULL && row_info != NULL)
if (png_ptr != NULL && row_info != NULL)
++filters_used[*(data - 1)];
}
#endif
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
/* example of using user transform callback (we don't transform anything,
but merely count the zero samples) */
/* Example of using user transform callback (we don't transform anything,
* but merely count the zero samples)
*/
static png_uint_32 zero_samples;
@@ -198,7 +202,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
png_bytep dp = data;
if (png_ptr == NULL)return;
/* contents of row_info:
/* Contents of row_info:
* png_uint_32 width width of row
* png_uint_32 rowbytes number of bytes in row
* png_byte color_type color type of pixels
@@ -207,8 +211,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
* png_byte pixel_depth bits per pixel (depth*channels)
*/
/* counts the number of zero samples (or zero pixels if color_type is 3 */
/* Counts the number of zero samples (or zero pixels if color_type is 3 */
if (row_info->color_type == 0 || row_info->color_type == 3)
{
@@ -218,7 +221,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
{
if (row_info->bit_depth == 1)
{
if (((*dp << pos++ ) & 0x80) == 0) zero_samples++;
if (((*dp << pos++ ) & 0x80) == 0)
zero_samples++;
if (pos == 8)
{
pos = 0;
@@ -227,7 +231,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
}
if (row_info->bit_depth == 2)
{
if (((*dp << (pos+=2)) & 0xc0) == 0) zero_samples++;
if (((*dp << (pos+=2)) & 0xc0) == 0)
zero_samples++;
if (pos == 8)
{
pos = 0;
@@ -236,7 +241,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
}
if (row_info->bit_depth == 4)
{
if (((*dp << (pos+=4)) & 0xf0) == 0) zero_samples++;
if (((*dp << (pos+=4)) & 0xf0) == 0)
zero_samples++;
if (pos == 8)
{
pos = 0;
@@ -244,7 +250,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
}
}
if (row_info->bit_depth == 8)
if (*dp++ == 0) zero_samples++;
if (*dp++ == 0)
zero_samples++;
if (row_info->bit_depth == 16)
{
if ((*dp | *(dp+1)) == 0) zero_samples++;
@@ -252,7 +259,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
}
}
}
else /* other color types */
else /* Other color types */
{
png_uint_32 n, nstop;
int channel;
@@ -264,7 +271,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
for (channel = 0; channel < color_channels; channel++)
{
if (row_info->bit_depth == 8)
if (*dp++ == 0) zero_samples++;
if (*dp++ == 0)
zero_samples++;
if (row_info->bit_depth == 16)
{
if ((*dp | *(dp+1)) == 0) zero_samples++;
@@ -274,7 +282,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
if (row_info->color_type > 3)
{
dp++;
if (row_info->bit_depth == 16)dp++;
if (row_info->bit_depth == 16)
dp++;
}
}
}
@@ -285,12 +294,13 @@ static int wrote_question = 0;
#if defined(PNG_NO_STDIO)
/* START of code to validate stdio-free compilation */
/* These copies of the default read/write functions come from pngrio.c and */
/* pngwio.c. They allow "don't include stdio" testing of the library. */
/* This is the function that does the actual reading of data. If you are
not reading from a standard C stream, you should create a replacement
read_data function and use it at run time with png_set_read_fn(), rather
than changing the library. */
/* These copies of the default read/write functions come from pngrio.c and
* pngwio.c. They allow "don't include stdio" testing of the library.
* This is the function that does the actual reading of data. If you are
* not reading from a standard C stream, you should create a replacement
* read_data function and use it at run time with png_set_read_fn(), rather
* than changing the library.
*/
#ifndef USE_FAR_KEYWORD
static void
@@ -309,7 +319,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
}
}
#else
/* this is the model-independent version. Since the standard I/O library
/* This is the model-independent version. Since the standard I/O library
can't handle far buffers in the medium and small models, we have to copy
the data.
*/
@@ -341,7 +351,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
read = MIN(NEAR_BUF_SIZE, remaining);
READFILE(io_ptr, buf, 1, err);
png_memcpy(data, buf, read); /* copy far buffer to near buffer */
png_memcpy(data, buf, read); /* Copy far buffer to near buffer */
if (err != read)
break;
else
@@ -352,9 +362,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
while (remaining != 0);
}
if (check != length)
{
png_error(png_ptr, "read Error");
}
}
#endif /* USE_FAR_KEYWORD */
@@ -363,14 +371,15 @@ static void
pngtest_flush(png_structp png_ptr)
{
/* Do nothing; fflush() is said to be just a waste of energy. */
png_ptr = png_ptr; /* stifle compiler warning */
png_ptr = png_ptr; /* Stifle compiler warning */
}
#endif
/* This is the function that does the actual writing of data. If you are
not writing to a standard C stream, you should create a replacement
write_data function and use it at run time with png_set_write_fn(), rather
than changing the library. */
* not writing to a standard C stream, you should create a replacement
* write_data function and use it at run time with png_set_write_fn(), rather
* than changing the library.
*/
#ifndef USE_FAR_KEYWORD
static void
pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -384,7 +393,7 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
}
}
#else
/* this is the model-independent version. Since the standard I/O library
/* This is the model-independent version. Since the standard I/O library
can't handle far buffers in the medium and small models, we have to copy
the data.
*/
@@ -415,7 +424,7 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
do
{
written = MIN(NEAR_BUF_SIZE, remaining);
png_memcpy(buf, data, written); /* copy far buffer to near buffer */
png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
WRITEFILE(io_ptr, buf, written, err);
if (err != written)
break;
@@ -457,7 +466,8 @@ pngtest_error(png_structp png_ptr, png_const_charp message)
{
pngtest_warning(png_ptr, message);
/* We can return because png_error calls the default handler, which is
* actually OK in this case. */
* actually OK in this case.
*/
}
#endif /* PNG_NO_STDIO */
/* END of code to validate stdio-free compilation */
@@ -466,13 +476,14 @@ pngtest_error(png_structp png_ptr, png_const_charp message)
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
/* Allocate memory. For reasonable files, size should never exceed
64K. However, zlib may allocate more then 64K if you don't tell
it not to. See zconf.h and png.h for more information. zlib does
need to allocate exactly 64K, so whatever you call here must
have the ability to do that.
This piece of code can be compiled to validate max 64K allocations
by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
* 64K. However, zlib may allocate more then 64K if you don't tell
* it not to. See zconf.h and png.h for more information. zlib does
* need to allocate exactly 64K, so whatever you call here must
* have the ability to do that.
*
* This piece of code can be compiled to validate max 64K allocations
* by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
*/
typedef struct memory_information
{
png_uint_32 size;
@@ -495,7 +506,8 @@ png_debug_malloc(png_structp png_ptr, png_uint_32 size)
{
/* png_malloc has already tested for NULL; png_create_struct calls
png_debug_malloc directly, with png_ptr == NULL which is OK */
* png_debug_malloc directly, with png_ptr == NULL which is OK
*/
if (size == 0)
return (NULL);
@@ -592,7 +604,7 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
/* Demonstration of user chunk support of the sTER and vpAg chunks */
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
/* (sTER is a public chunk not yet understood by libpng. vpAg is a private
/* (sTER is a public chunk not yet known by libpng. vpAg is a private
chunk used in ImageMagick to store "virtual page" size). */
static png_uint_32 user_chunk_data[4];
@@ -606,50 +618,51 @@ static png_uint_32 user_chunk_data[4];
static int read_user_chunk_callback(png_struct *png_ptr,
png_unknown_chunkp chunk)
{
png_uint_32
*my_user_chunk_data;
png_uint_32
*my_user_chunk_data;
/* Return one of the following: */
/* return (-n); chunk had an error */
/* return (0); did not recognize */
/* return (n); success */
/* Return one of the following:
* return (-n); chunk had an error
* return (0); did not recognize
* return (n); success
*
* The unknown chunk structure contains the chunk data:
* png_byte name[5];
* png_byte *data;
* png_size_t size;
*
* Note that libpng has already taken care of the CRC handling.
*/
/* The unknown chunk structure contains the chunk data:
* png_byte name[5];
* png_byte *data;
* png_size_t size;
*
* Note that libpng has already taken care of the CRC handling.
*/
if (chunk->name[0] == 115 && chunk->name[1] == 84 && /* s T */
chunk->name[2] == 69 && chunk->name[3] == 82) /* E R */
{
/* Found sTER chunk */
if (chunk->size != 1)
return (-1); /* Error return */
if (chunk->data[0] != 0 && chunk->data[0] != 1)
return (-1); /* Invalid mode */
my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
my_user_chunk_data[0]=chunk->data[0]+1;
return (1);
}
if (chunk->name[0] == 115 && chunk->name[1] == 84 && /* s T */
chunk->name[2] == 69 && chunk->name[3] == 82) /* E R */
{
/* Found sTER chunk */
if (chunk->size != 1)
return (-1); /* Error return */
if (chunk->data[0] != 0 && chunk->data[0] != 1)
return (-1); /* Invalid mode */
my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
my_user_chunk_data[0]=chunk->data[0]+1;
return (1);
}
if (chunk->name[0] != 118 || chunk->name[1] != 112 || /* v p */
chunk->name[2] != 65 || chunk->name[3] != 103) /* A g */
return (0); /* Did not recognize */
if (chunk->name[0] != 118 || chunk->name[1] != 112 || /* v p */
chunk->name[2] != 65 || chunk->name[3] != 103) /* A g */
return (0); /* Did not recognize */
/* Found ImageMagick vpAg chunk */
/* Found ImageMagick vpAg chunk */
if (chunk->size != 9)
return (-1); /* Error return */
if (chunk->size != 9)
return (-1); /* Error return */
my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data);
my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4);
my_user_chunk_data[3]=(png_uint_32)chunk->data[8];
my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data);
my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4);
my_user_chunk_data[3]=(png_uint_32)chunk->data[8];
return (1);
return (1);
}
#endif
@@ -730,12 +743,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#endif
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
user_chunk_data[0] = 0;
user_chunk_data[1] = 0;
user_chunk_data[2] = 0;
user_chunk_data[3] = 0;
png_set_read_user_chunk_fn(read_ptr, user_chunk_data,
read_user_chunk_callback);
user_chunk_data[0] = 0;
user_chunk_data[1] = 0;
user_chunk_data[2] = 0;
user_chunk_data[3] = 0;
png_set_read_user_chunk_fn(read_ptr, user_chunk_data,
read_user_chunk_callback);
#endif
#ifdef PNG_WRITE_SUPPORTED
@@ -844,10 +857,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
{
int i;
for (i = 0; i<256; i++)
filters_used[i] = 0;
png_set_read_user_transform_fn(read_ptr, count_filters);
int i;
for (i = 0; i<256; i++)
filters_used[i] = 0;
png_set_read_user_transform_fn(read_ptr, count_filters);
}
#endif
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
@@ -906,9 +919,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_fixed_point gamma;
if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
{
png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
}
}
#endif
#else /* Use floating point versions */
@@ -930,13 +941,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
double gamma;
if (png_get_gAMA(read_ptr, read_info_ptr, &gamma))
{
png_set_gAMA(write_ptr, write_info_ptr, gamma);
}
}
#endif
#endif /* floating point */
#endif /* fixed point */
#endif /* Floating point */
#endif /* Fixed point */
#if defined(PNG_iCCP_SUPPORTED)
{
png_charp name;
@@ -957,9 +966,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int intent;
if (png_get_sRGB(read_ptr, read_info_ptr, &intent))
{
png_set_sRGB(write_ptr, write_info_ptr, intent);
}
}
#endif
{
@@ -967,9 +974,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int num_palette;
if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
{
png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
}
}
#if defined(PNG_bKGD_SUPPORTED)
{
@@ -986,9 +991,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_uint_16p hist;
if (png_get_hIST(read_ptr, read_info_ptr, &hist))
{
png_set_hIST(write_ptr, write_info_ptr, hist);
}
}
#endif
#if defined(PNG_oFFs_SUPPORTED)
@@ -997,7 +1000,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int unit_type;
if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
&unit_type))
&unit_type))
{
png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
}
@@ -1024,9 +1027,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int unit_type;
if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y, &unit_type))
{
png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
}
}
#endif
#if defined(PNG_sBIT_SUPPORTED)
@@ -1034,9 +1035,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_color_8p sig_bit;
if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
{
png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
}
}
#endif
#if defined(PNG_sCAL_SUPPORTED)
@@ -1086,9 +1085,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
{
png_set_tIME(write_ptr, write_info_ptr, mod_time);
#if defined(PNG_TIME_RFC1123_SUPPORTED)
/* we have to use png_memcpy instead of "=" because the string
pointed to by png_convert_to_rfc1123() gets free'ed before
we use it */
/* We have to use png_memcpy instead of "=" because the string
* pointed to by png_convert_to_rfc1123() gets free'ed before
* we use it.
*/
png_memcpy(tIME_string,
png_convert_to_rfc1123(read_ptr, mod_time),
png_sizeof(tIME_string));
@@ -1110,13 +1110,13 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int sample_max = (1 << read_info_ptr->bit_depth);
/* libpng doesn't reject a tRNS chunk with out-of-range samples */
if (!((read_info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
(int)trans_values->gray > sample_max) ||
(read_info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
((int)trans_values->red > sample_max ||
(int)trans_values->green > sample_max ||
(int)trans_values->blue > sample_max))))
png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
trans_values);
(int)trans_values->gray > sample_max) ||
(read_info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
((int)trans_values->red > sample_max ||
(int)trans_values->green > sample_max ||
(int)trans_values->blue > sample_max))))
png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
trans_values);
}
}
#endif
@@ -1130,9 +1130,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_size_t i;
png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
num_unknowns);
/* copy the locations from the read_info_ptr. The automatically
generated locations in write_info_ptr are wrong because we
haven't written anything yet */
/* Copy the locations from the read_info_ptr. The automatically
* generated locations in write_info_ptr are wrong because we
* haven't written anything yet.
*/
for (i = 0; i < (png_size_t)num_unknowns; i++)
png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
unknowns[i].location);
@@ -1144,40 +1145,40 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_debug(0, "Writing info struct");
/* If we wanted, we could write info in two steps:
png_write_info_before_PLTE(write_ptr, write_info_ptr);
* png_write_info_before_PLTE(write_ptr, write_info_ptr);
*/
png_write_info(write_ptr, write_info_ptr);
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
if (user_chunk_data[0] != 0)
{
png_byte png_sTER[5] = {115, 84, 69, 82, '\0'};
png_byte png_sTER[5] = {115, 84, 69, 82, '\0'};
unsigned char
ster_chunk_data[1];
unsigned char
ster_chunk_data[1];
if (verbose)
fprintf(STDERR, "\n stereo mode = %lu\n",
(unsigned long)(user_chunk_data[0] - 1));
ster_chunk_data[0]=(unsigned char)(user_chunk_data[0] - 1);
png_write_chunk(write_ptr, png_sTER, ster_chunk_data, 1);
if (verbose)
fprintf(STDERR, "\n stereo mode = %lu\n",
(unsigned long)(user_chunk_data[0] - 1));
ster_chunk_data[0]=(unsigned char)(user_chunk_data[0] - 1);
png_write_chunk(write_ptr, png_sTER, ster_chunk_data, 1);
}
if (user_chunk_data[1] != 0 || user_chunk_data[2] != 0)
{
png_byte png_vpAg[5] = {118, 112, 65, 103, '\0'};
png_byte png_vpAg[5] = {118, 112, 65, 103, '\0'};
unsigned char
vpag_chunk_data[9];
unsigned char
vpag_chunk_data[9];
if (verbose)
fprintf(STDERR, " vpAg = %lu x %lu, units = %lu\n",
(unsigned long)user_chunk_data[1],
(unsigned long)user_chunk_data[2],
(unsigned long)user_chunk_data[3]);
png_save_uint_32(vpag_chunk_data, user_chunk_data[1]);
png_save_uint_32(vpag_chunk_data + 4, user_chunk_data[2]);
vpag_chunk_data[8] = (unsigned char)(user_chunk_data[3] & 0xff);
png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
if (verbose)
fprintf(STDERR, " vpAg = %lu x %lu, units = %lu\n",
(unsigned long)user_chunk_data[1],
(unsigned long)user_chunk_data[2],
(unsigned long)user_chunk_data[3]);
png_save_uint_32(vpag_chunk_data, user_chunk_data[1]);
png_save_uint_32(vpag_chunk_data + 4, user_chunk_data[2]);
vpag_chunk_data[8] = (unsigned char)(user_chunk_data[3] & 0xff);
png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
}
#endif
@@ -1272,7 +1273,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
{
png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
#if defined(PNG_TIME_RFC1123_SUPPORTED)
/* we have to use png_memcpy instead of "=" because the string
/* We have to use png_memcpy instead of "=" because the string
pointed to by png_convert_to_rfc1123() gets free'ed before
we use it */
png_memcpy(tIME_string,
@@ -1295,9 +1296,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_size_t i;
png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
num_unknowns);
/* copy the locations from the read_info_ptr. The automatically
generated locations in write_end_info_ptr are wrong because we
haven't written the end_info yet */
/* Copy the locations from the read_info_ptr. The automatically
* generated locations in write_end_info_ptr are wrong because we
* haven't written the end_info yet.
*/
for (i = 0; i < (png_size_t)num_unknowns; i++)
png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
unknowns[i].location);
@@ -1420,7 +1422,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
return (0);
}
/* input and output filenames */
/* Input and output filenames */
#ifdef RISCOS
static PNG_CONST char *inname = "pngtest/png";
static PNG_CONST char *outname = "pngout/png";
@@ -1449,9 +1451,10 @@ main(int argc, char *argv[])
(long)png_sizeof(png_struct), (long)png_sizeof(png_info));
/* Do some consistency checking on the memory allocation settings, I'm
not sure this matters, but it is nice to know, the first of these
tests should be impossible because of the way the macros are set
in pngconf.h */
* not sure this matters, but it is nice to know, the first of these
* tests should be impossible because of the way the macros are set
* in pngconf.h
*/
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
#endif
@@ -1681,4 +1684,4 @@ main(int argc, char *argv[])
}
/* Generate a compiler error if there is an old png.h in the search path. */
typedef version_1_2_36 your_png_h_is_not_version_1_2_36;
typedef version_1_2_37rc01 your_png_h_is_not_version_1_2_37rc01;

64
pngtrans.c
View File

@@ -1,9 +1,9 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Last changed in libpng 1.2.30 [August 15, 2008]
* Last changed in libpng 1.2.36 [May 14, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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.)
*/
@@ -13,35 +13,38 @@
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* turn on BGR-to-RGB mapping */
/* Turn on BGR-to-RGB mapping */
void PNGAPI
png_set_bgr(png_structp png_ptr)
{
png_debug(1, "in png_set_bgr");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_BGR;
}
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* turn on 16 bit byte swapping */
/* Turn on 16 bit byte swapping */
void PNGAPI
png_set_swap(png_structp png_ptr)
{
png_debug(1, "in png_set_swap");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth == 16)
png_ptr->transformations |= PNG_SWAP_BYTES;
}
#endif
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
/* turn on pixel packing */
/* Turn on pixel packing */
void PNGAPI
png_set_packing(png_structp png_ptr)
{
png_debug(1, "in png_set_packing");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth < 8)
{
png_ptr->transformations |= PNG_PACK;
@@ -51,12 +54,13 @@ png_set_packing(png_structp png_ptr)
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* turn on packed pixel swapping */
/* Turn on packed pixel swapping */
void PNGAPI
png_set_packswap(png_structp png_ptr)
{
png_debug(1, "in png_set_packswap");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth < 8)
png_ptr->transformations |= PNG_PACKSWAP;
}
@@ -67,7 +71,8 @@ void PNGAPI
png_set_shift(png_structp png_ptr, png_color_8p true_bits)
{
png_debug(1, "in png_set_shift");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_SHIFT;
png_ptr->shift = *true_bits;
}
@@ -99,7 +104,8 @@ void PNGAPI
png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_filler");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_FILLER;
png_ptr->filler = (png_byte)filler;
if (filler_loc == PNG_FILLER_AFTER)
@@ -132,7 +138,8 @@ void PNGAPI
png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_add_alpha");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_set_filler(png_ptr, filler, filler_loc);
png_ptr->transformations |= PNG_ADD_ALPHA;
}
@@ -146,7 +153,8 @@ void PNGAPI
png_set_swap_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_swap_alpha");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_SWAP_ALPHA;
}
#endif
@@ -157,7 +165,8 @@ void PNGAPI
png_set_invert_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_invert_alpha");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_INVERT_ALPHA;
}
#endif
@@ -167,11 +176,12 @@ void PNGAPI
png_set_invert_mono(png_structp png_ptr)
{
png_debug(1, "in png_set_invert_mono");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_INVERT_MONO;
}
/* invert monochrome grayscale data */
/* Invert monochrome grayscale data */
void /* PRIVATE */
png_do_invert(png_row_infop row_info, png_bytep row)
{
@@ -226,7 +236,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* swaps byte order on 16 bit depth images */
/* Swaps byte order on 16 bit depth images */
void /* PRIVATE */
png_do_swap(png_row_infop row_info, png_bytep row)
{
@@ -357,7 +367,7 @@ static PNG_CONST png_byte fourbppswaptable[256] = {
0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
};
/* swaps pixel packing order within bytes */
/* Swaps pixel packing order within bytes */
void /* PRIVATE */
png_do_packswap(png_row_infop row_info, png_bytep row)
{
@@ -389,7 +399,7 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* remove filler or alpha byte(s) */
/* Remove filler or alpha byte(s) */
void /* PRIVATE */
png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
{
@@ -404,9 +414,9 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
png_uint_32 i;
if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
(row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
(flags & PNG_FLAG_STRIP_ALPHA))) &&
row_info->channels == 4)
(row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
(flags & PNG_FLAG_STRIP_ALPHA))) &&
row_info->channels == 4)
{
if (row_info->bit_depth == 8)
{
@@ -547,7 +557,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
#endif
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* swaps red and blue bytes within a pixel */
/* Swaps red and blue bytes within a pixel */
void /* PRIVATE */
png_do_bgr(png_row_infop row_info, png_bytep row)
{
@@ -631,7 +641,8 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp
user_transform_ptr, int user_transform_depth, int user_transform_channels)
{
png_debug(1, "in png_set_user_transform_info");
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
png_ptr->user_transform_ptr = user_transform_ptr;
png_ptr->user_transform_depth = (png_byte)user_transform_depth;
@@ -652,7 +663,8 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp
png_voidp PNGAPI
png_get_user_transform_ptr(png_structp png_ptr)
{
if (png_ptr == NULL) return (NULL);
if (png_ptr == NULL)
return (NULL);
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
return ((png_voidp)png_ptr->user_transform_ptr);
#else

103
pngwio.c
View File

@@ -1,7 +1,7 @@
/* pngwio.c - functions for data output
*
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -20,10 +20,11 @@
#ifdef PNG_WRITE_SUPPORTED
/* Write the data to whatever output you are using. The default routine
writes to a file pointer. Note that this routine sometimes gets called
with very small lengths, so you should implement some kind of simple
buffering if you are using unbuffered writes. This should never be asked
to write more than 64K on a 16 bit machine. */
* writes to a file pointer. Note that this routine sometimes gets called
* with very small lengths, so you should implement some kind of simple
* buffering if you are using unbuffered writes. This should never be asked
* to write more than 64K on a 16 bit machine.
*/
void /* PRIVATE */
png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -36,9 +37,10 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
#if !defined(PNG_NO_STDIO)
/* This is the function that does the actual writing of data. If you are
not writing to a standard C stream, you should create a replacement
write_data function and use it at run time with png_set_write_fn(), rather
than changing the library. */
* not writing to a standard C stream, you should create a replacement
* write_data function and use it at run time with png_set_write_fn(), rather
* than changing the library.
*/
#ifndef USE_FAR_KEYWORD
void PNGAPI
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -56,10 +58,10 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
png_error(png_ptr, "Write Error");
}
#else
/* this is the model-independent version. Since the standard I/O library
can't handle far buffers in the medium and small models, we have to copy
the data.
*/
/* This is the model-independent version. Since the standard I/O library
* can't handle far buffers in the medium and small models, we have to copy
* the data.
*/
#define NEAR_BUF_SIZE 1024
#define MIN(a,b) (a <= b ? a : b)
@@ -93,7 +95,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
do
{
written = MIN(NEAR_BUF_SIZE, remaining);
png_memcpy(buf, data, written); /* copy far buffer to near buffer */
png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
#if defined(_WIN32_WCE)
if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
err = 0;
@@ -102,8 +104,10 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
#endif
if (err != written)
break;
else
check += err;
data += written;
remaining -= written;
}
@@ -117,8 +121,9 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
#endif
/* This function is called to output any data pending writing (normally
to disk). After png_flush is called, there should be no data pending
writing in any buffers. */
* to disk). After png_flush is called, there should be no data pending
* writing in any buffers.
*/
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
void /* PRIVATE */
png_flush(png_structp png_ptr)
@@ -134,7 +139,8 @@ png_default_flush(png_structp png_ptr)
#if !defined(_WIN32_WCE)
png_FILE_p io_ptr;
#endif
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
#if !defined(_WIN32_WCE)
io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
fflush(io_ptr);
@@ -144,43 +150,47 @@ png_default_flush(png_structp png_ptr)
#endif
/* This function allows the application to supply new output functions for
libpng if standard C streams aren't being used.
This function takes as its arguments:
png_ptr - pointer to a png output data structure
io_ptr - pointer to user supplied structure containing info about
the output functions. May be NULL.
write_data_fn - pointer to a new output function that takes as its
arguments a pointer to a png_struct, a pointer to
data to be written, and a 32-bit unsigned int that is
the number of bytes to be written. The new write
function should call png_error(png_ptr, "Error msg")
to exit and output any fatal error messages. May be
NULL, in which case libpng's default function will
be used.
flush_data_fn - pointer to a new flush function that takes as its
arguments a pointer to a png_struct. After a call to
the flush function, there should be no data in any buffers
or pending transmission. If the output method doesn't do
any buffering of ouput, a function prototype must still be
supplied although it doesn't have to do anything. If
PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
time, output_flush_fn will be ignored, although it must be
supplied for compatibility. May be NULL, in which case
libpng's default function will be used, if
PNG_WRITE_FLUSH_SUPPORTED is defined. This is not
a good idea if io_ptr does not point to a standard
*FILE structure. */
* libpng if standard C streams aren't being used.
*
* This function takes as its arguments:
* png_ptr - pointer to a png output data structure
* io_ptr - pointer to user supplied structure containing info about
* the output functions. May be NULL.
* write_data_fn - pointer to a new output function that takes as its
* arguments a pointer to a png_struct, a pointer to
* data to be written, and a 32-bit unsigned int that is
* the number of bytes to be written. The new write
* function should call png_error(png_ptr, "Error msg")
* to exit and output any fatal error messages. May be
* NULL, in which case libpng's default function will
* be used.
* flush_data_fn - pointer to a new flush function that takes as its
* arguments a pointer to a png_struct. After a call to
* the flush function, there should be no data in any buffers
* or pending transmission. If the output method doesn't do
* any buffering of ouput, a function prototype must still be
* supplied although it doesn't have to do anything. If
* PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
* time, output_flush_fn will be ignored, although it must be
* supplied for compatibility. May be NULL, in which case
* libpng's default function will be used, if
* PNG_WRITE_FLUSH_SUPPORTED is defined. This is not
* a good idea if io_ptr does not point to a standard
* *FILE structure.
*/
void PNGAPI
png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_ptr->io_ptr = io_ptr;
#if !defined(PNG_NO_STDIO)
if (write_data_fn != NULL)
png_ptr->write_data_fn = write_data_fn;
else
png_ptr->write_data_fn = png_default_write_data;
#else
@@ -191,6 +201,7 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
#if !defined(PNG_NO_STDIO)
if (output_flush_fn != NULL)
png_ptr->output_flush_fn = output_flush_fn;
else
png_ptr->output_flush_fn = png_default_flush;
#else
@@ -217,9 +228,11 @@ void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
void FAR *far_ptr;
FP_OFF(near_ptr) = FP_OFF(ptr);
far_ptr = (void FAR *)near_ptr;
if (check != 0)
if (FP_SEG(ptr) != FP_SEG(far_ptr))
png_error(png_ptr, "segment lost in conversion");
return(near_ptr);
}
# else
@@ -229,9 +242,11 @@ void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
void FAR *far_ptr;
near_ptr = (void FAR *)ptr;
far_ptr = (void FAR *)near_ptr;
if (check != 0)
if (far_ptr != ptr)
png_error(png_ptr, "segment lost in conversion");
return(near_ptr);
}
# endif

259
pngwrite.c
View File

@@ -1,14 +1,14 @@
/* pngwrite.c - general routines to write a PNG file
*
* Last changed in libpng 1.2.34 [December 18, 2008]
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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 */
/* Get internal access to png.h */
#define PNG_INTERNAL
#include "png.h"
#ifdef PNG_WRITE_SUPPORTED
@@ -30,7 +30,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
return;
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
{
png_write_sig(png_ptr); /* write PNG signature */
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))
{
@@ -38,7 +38,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
png_ptr->mng_features_permitted=0;
}
#endif
/* write IHDR information. */
/* 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,
@@ -47,8 +47,9 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
#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. */
/* 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)
{
@@ -97,14 +98,14 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
png_unknown_chunk *up;
png_unknown_chunk *up;
png_debug(5, "writing extra chunks");
png_debug(5, "writing extra chunks");
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
{
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 != PNG_HANDLE_CHUNK_NEVER &&
up->location && !(up->location & PNG_HAVE_PLTE) &&
@@ -116,7 +117,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
png_warning(png_ptr, "Writing zero-length unknown chunk");
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
}
#endif
png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
@@ -145,20 +146,20 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
#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]);
}
/* 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)
@@ -179,49 +180,56 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
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 defined(PNG_sCAL_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sCAL)
#if defined(PNG_WRITE_sCAL_SUPPORTED)
#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
#else /* !FLOATING_POINT */
#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
#endif /* FIXED_POINT */
#endif /* FLOATING_POINT */
#else /* !WRITE_sCAL */
png_warning(png_ptr,
"png_write_sCAL not supported; sCAL chunk not written.");
#endif
#endif
#endif
#endif /* WRITE_sCAL */
#endif /* sCAL */
#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
#endif /* pHYs */
#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
#endif /* tIME */
#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
#endif /* sPLT */
#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", i,
info_ptr->text[i].compression);
/* an internationalized chunk? */
/* An internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write international chunk */
/* Write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
@@ -238,7 +246,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
/* Write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
@@ -251,18 +259,20 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
/* 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");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
#else
/* Can't get here */
png_warning(png_ptr, "Unable to write uncompressed text");
#endif
}
}
#endif
#endif /* tEXt */
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
@@ -302,29 +312,29 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
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 */
/* See if user wants us to write information chunks */
if (info_ptr != NULL)
{
#if defined(PNG_WRITE_TEXT_SUPPORTED)
int i; /* local index variable */
int i; /* Local index variable */
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* check to see if user has supplied a time chunk */
/* 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 */
/* Loop through comment chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing trailer text chunk %d, type %d", i,
info_ptr->text[i].compression);
/* an internationalized chunk? */
/* An internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write international chunk */
/* Write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
@@ -340,7 +350,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
/* Write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
@@ -353,7 +363,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
/* Write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0);
#else
@@ -391,7 +401,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
png_ptr->mode |= PNG_AFTER_IDAT;
/* write end of PNG file */
/* Write end of PNG file */
png_write_IEND(png_ptr);
/* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
* and restored again in libpng-1.2.30, may cause some applications that
@@ -471,7 +481,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
if (png_ptr == NULL)
return (NULL);
/* added at libpng-1.2.6 */
/* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
@@ -542,7 +552,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
}
}
/* initialize zbuf - compression buffer */
/* 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);
@@ -636,7 +646,7 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
{
png_structp png_ptr=*ptr_ptr;
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
jmp_buf tmp_jmp; /* To save current jump buffer */
#endif
int i = 0;
@@ -662,7 +672,7 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
png_debug(1, "in png_write_init_3");
#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
/* Save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
@@ -673,24 +683,24 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
*ptr_ptr = png_ptr;
}
/* reset all variables to 0 */
/* Reset all variables to 0 */
png_memset(png_ptr, 0, png_sizeof(png_struct));
/* added at libpng-1.2.6 */
/* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
/* Restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
#endif
png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
png_flush_ptr_NULL);
/* initialize zbuf - compression buffer */
/* 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);
@@ -710,15 +720,15 @@ void PNGAPI
png_write_rows(png_structp png_ptr, png_bytepp row,
png_uint_32 num_rows)
{
png_uint_32 i; /* row counter */
png_bytepp rp; /* row pointer */
png_uint_32 i; /* Row counter */
png_bytepp rp; /* Row pointer */
png_debug(1, "in png_write_rows");
if (png_ptr == NULL)
return;
/* loop through the rows */
/* Loop through the rows */
for (i = 0, rp = row; i < num_rows; i++, rp++)
{
png_write_row(png_ptr, *rp);
@@ -731,25 +741,26 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
void PNGAPI
png_write_image(png_structp png_ptr, png_bytepp image)
{
png_uint_32 i; /* row index */
int pass, num_pass; /* pass variables */
png_bytepp rp; /* points to current row */
png_uint_32 i; /* Row index */
int pass, num_pass; /* Pass variables */
png_bytepp rp; /* Points to current row */
if (png_ptr == NULL)
return;
png_debug(1, "in png_write_image");
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* intialize interlace handling. If image is not interlaced,
this will set pass to 1 */
/* Initialize interlace handling. If image is not interlaced,
* this will set pass to 1
*/
num_pass = png_set_interlace_handling(png_ptr);
#else
num_pass = 1;
#endif
/* loop through passes */
/* Loop through passes */
for (pass = 0; pass < num_pass; pass++)
{
/* loop through image */
/* Loop through image */
for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
{
png_write_row(png_ptr, *rp);
@@ -757,7 +768,7 @@ png_write_image(png_structp png_ptr, png_bytepp image)
}
}
/* called by user to write a row of image data */
/* Called by user to write a row of image data */
void PNGAPI
png_write_row(png_structp png_ptr, png_bytep row)
{
@@ -766,49 +777,49 @@ png_write_row(png_structp png_ptr, png_bytep row)
png_debug2(1, "in png_write_row (row %ld, pass %d)",
png_ptr->row_number, png_ptr->pass);
/* initialize transformations and other stuff if first time */
/* 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.");
/* 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 */
/* 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.");
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.");
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.");
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.");
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.");
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.");
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.");
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 interlaced and not interested in row, return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
@@ -866,7 +877,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
}
#endif
/* set up row info for transformations */
/* 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;
@@ -889,13 +900,13 @@ png_write_row(png_structp png_ptr, png_bytep row)
png_ptr->row_info.rowbytes);
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* handle interlacing */
/* 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 ... */
/* This should always get caught above, but still ... */
if (!(png_ptr->row_info.width))
{
png_write_finish_row(png_ptr);
@@ -904,7 +915,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
}
#endif
/* handle other transformations */
/* Handle other transformations */
if (png_ptr->transformations)
png_do_write_transformations(png_ptr);
@@ -944,7 +955,7 @@ png_set_flush(png_structp png_ptr, int nrows)
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
}
/* flush the current output buffers now */
/* Flush the current output buffers now */
void PNGAPI
png_write_flush(png_structp png_ptr)
{
@@ -955,17 +966,17 @@ png_write_flush(png_structp png_ptr)
return;
/* We have already written out all of the data */
if (png_ptr->row_number >= png_ptr->num_rows)
return;
return;
do
{
int ret;
/* compress the data */
/* Compress the data */
ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
wrote_IDAT = 0;
/* check for compression errors */
/* Check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream.msg != NULL)
@@ -976,7 +987,7 @@ png_write_flush(png_structp png_ptr)
if (!(png_ptr->zstream.avail_out))
{
/* write the IDAT and reset the zlib output buffer */
/* 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;
@@ -988,7 +999,7 @@ png_write_flush(png_structp png_ptr)
/* If there is any data left to be output, write it into a new IDAT */
if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
{
/* write the IDAT and reset the zlib output buffer */
/* Write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -999,7 +1010,7 @@ png_write_flush(png_structp png_ptr)
}
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* free all memory used by the write */
/* Free all memory used by the write */
void PNGAPI
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
{
@@ -1075,7 +1086,7 @@ void /* PRIVATE */
png_write_destroy(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* save jump buffer */
jmp_buf tmp_jmp; /* Save jump buffer */
#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
@@ -1085,10 +1096,10 @@ png_write_destroy(png_structp png_ptr)
#endif
png_debug(1, "in png_write_destroy");
/* free any memory zlib uses */
/* Free any memory zlib uses */
deflateEnd(&png_ptr->zstream);
/* free our memory. png_free checks NULL for us. */
/* Free our memory. png_free checks NULL for us. */
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->row_buf);
#ifndef PNG_NO_WRITE_FILTER
@@ -1112,7 +1123,7 @@ png_write_destroy(png_structp png_ptr)
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* reset structure */
/* Reset structure */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
@@ -1415,7 +1426,7 @@ png_set_compression_window_bits(png_structp png_ptr, int window_bits)
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 */
/* Avoid libpng bug with 256-byte windows */
if (window_bits == 8)
{
png_warning(png_ptr, "Compression window is being reset to 512");
@@ -1468,9 +1479,9 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
if (png_ptr == NULL || info_ptr == NULL)
return;
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel from opacity to transparency */
/* Invert the alpha channel from opacity to transparency */
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
png_set_invert_alpha(png_ptr);
#endif
/* Write the file header information. */
@@ -1479,9 +1490,9 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
/* ------ these transformations don't touch the info structure ------- */
#if defined(PNG_WRITE_INVERT_SUPPORTED)
/* invert monochrome pixels */
/* Invert monochrome pixels */
if (transforms & PNG_TRANSFORM_INVERT_MONO)
png_set_invert_mono(png_ptr);
png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
@@ -1490,57 +1501,57 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
*/
if ((transforms & PNG_TRANSFORM_SHIFT)
&& (info_ptr->valid & PNG_INFO_sBIT))
png_set_shift(png_ptr, &info_ptr->sig_bit);
png_set_shift(png_ptr, &info_ptr->sig_bit);
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED)
/* pack pixels into bytes */
/* Pack pixels into bytes */
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
#endif
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
/* swap location of alpha bytes from ARGB to RGBA */
/* Swap location of alpha bytes from ARGB to RGBA */
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED)
/* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED)
/* flip BGR pixels to RGB */
/* Flip BGR pixels to RGB */
if (transforms & PNG_TRANSFORM_BGR)
png_set_bgr(png_ptr);
png_set_bgr(png_ptr);
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
/* swap bytes of 16-bit files to most significant byte first */
/* Swap bytes of 16-bit files to most significant byte first */
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
png_set_swap(png_ptr);
png_set_swap(png_ptr);
#endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* swap bits of 1, 2, 4 bit packed pixel formats */
/* Swap bits of 1, 2, 4 bit packed pixel formats */
if (transforms & PNG_TRANSFORM_PACKSWAP)
png_set_packswap(png_ptr);
png_set_packswap(png_ptr);
#endif
/* ----------------------- end of transformations ------------------- */
/* write the bits */
/* Write the bits */
if (info_ptr->valid & PNG_INFO_IDAT)
png_write_image(png_ptr, info_ptr->row_pointers);
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end(png_ptr, info_ptr);
transforms = transforms; /* quiet compiler warnings */
transforms = transforms; /* Quiet compiler warnings */
params = params;
}
#endif

16
pngwtran.c
View File

@@ -1,9 +1,9 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
* Last changed in libpng 1.2.9 April 14, 2006
* Last changed in libpng 1.2.37 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2006 Glenn Randers-Pehrson
* Copyright (c) 1998-2009 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.)
*/
@@ -26,7 +26,7 @@ png_do_write_transformations(png_structp png_ptr)
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
if (png_ptr->transformations & PNG_USER_TRANSFORM)
if (png_ptr->write_user_transform_fn != NULL)
(*(png_ptr->write_user_transform_fn)) /* user write transform function */
(*(png_ptr->write_user_transform_fn)) /* User write transform function */
(png_ptr, /* png_ptr */
&(png_ptr->row_info), /* row_info: */
/* png_uint_32 width; width of row */
@@ -248,7 +248,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
channels++;
}
/* with low row depths, could only be grayscale, so one channel */
/* With low row depths, could only be grayscale, so one channel */
if (row_info->bit_depth < 8)
{
png_bytep bp = row;
@@ -439,7 +439,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* does nothing
/* Does nothing
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@@ -457,7 +457,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* does nothing
/* Does nothing
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@@ -495,7 +495,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* does nothing
/* Does nothing
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*/
@@ -510,7 +510,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
#endif
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* undoes intrapixel differencing */
/* Undoes intrapixel differencing */
void /* PRIVATE */
png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
{

354
pngwutil.c
View File

@@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* Last changed in libpng 1.2.36 [May 7, 2009]
* Last changed in libpng 1.2.36 [May 27, 2009]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -60,7 +60,7 @@ 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 */
/* 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)
@@ -80,7 +80,8 @@ void PNGAPI
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
png_bytep data, png_size_t length)
{
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
png_write_chunk_data(png_ptr, data, (png_size_t)length);
png_write_chunk_end(png_ptr);
@@ -98,15 +99,16 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
png_debug2(0, "Writing %s chunk, length = %lu", chunk_name,
(unsigned long)length);
if (png_ptr == NULL) return;
if (png_ptr == NULL)
return;
/* write the length and the chunk name */
/* Write the length and the chunk name */
png_save_uint_32(buf, length);
png_memcpy(buf + 4, chunk_name, 4);
png_write_data(png_ptr, buf, (png_size_t)8);
/* put the chunk name into png_ptr->chunk_name */
/* Put the chunk name into png_ptr->chunk_name */
png_memcpy(png_ptr->chunk_name, chunk_name, 4);
/* reset the crc and run it over the chunk name */
/* 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);
}
@@ -119,12 +121,13 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
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 (png_ptr == NULL) return;
/* Write the data, and run the CRC over it */
if (png_ptr == NULL)
return;
if (data != NULL && length > 0)
{
png_write_data(png_ptr, data, length);
/* update the CRC after writing the data,
/* Update the CRC after writing the data,
* in case that the user I/O routine alters it.
*/
png_calculate_crc(png_ptr, data, length);
@@ -139,15 +142,14 @@ png_write_chunk_end(png_structp png_ptr)
if (png_ptr == NULL) return;
/* write the crc in a single operation */
/* Write the crc in a single operation */
png_save_uint_32(buf, png_ptr->crc);
png_write_data(png_ptr, buf, (png_size_t)4);
}
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
/*
* This pair of functions encapsulates the operation of (a) compressing a
/* 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.
@@ -155,14 +157,14 @@ png_write_chunk_end(png_structp png_ptr)
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 */
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 */
/* 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,
@@ -176,7 +178,7 @@ png_text_compress(png_structp png_ptr,
comp->input = NULL;
comp->input_len = 0;
/* we may just want to pass the text right through */
/* We may just want to pass the text right through */
if (compression == PNG_TEXT_COMPRESSION_NONE)
{
comp->input = text;
@@ -210,29 +212,29 @@ png_text_compress(png_structp png_ptr,
* wouldn't cause a failure, just a slowdown due to swapping).
*/
/* set up the compression buffers */
/* 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() */
/* This is the same compression loop as in png_write_row() */
do
{
/* compress the data */
/* Compress the data */
ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
if (ret != Z_OK)
{
/* error */
/* 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 */
/* Check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
/* make sure the output array has room */
/* Make sure the output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
{
int old_max;
@@ -257,7 +259,7 @@ png_text_compress(png_structp png_ptr,
(comp->max_output_ptr * png_sizeof(png_charp)));
}
/* save the data */
/* Save the data */
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
@@ -269,21 +271,21 @@ png_text_compress(png_structp png_ptr,
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 */
/* Continue until we don't have any more to compress */
} while (png_ptr->zstream.avail_in);
/* finish the compression */
/* Finish the compression */
do
{
/* tell zlib we are finished */
/* Tell zlib we are finished */
ret = deflate(&png_ptr->zstream, Z_FINISH);
if (ret == Z_OK)
{
/* check to see if we need more room */
/* Check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
/* check to make sure our output array has room */
/* Check to make sure our output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
{
int old_max;
@@ -309,7 +311,7 @@ png_text_compress(png_structp png_ptr,
png_sizeof(png_charp)));
}
/* save off the data */
/* Save the data */
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
@@ -324,7 +326,7 @@ png_text_compress(png_structp png_ptr,
}
else if (ret != Z_STREAM_END)
{
/* we got an error */
/* We got an error */
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
@@ -332,7 +334,7 @@ png_text_compress(png_structp png_ptr,
}
} while (ret != Z_STREAM_END);
/* text length is number of buffers plus last buffer */
/* 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;
@@ -340,21 +342,21 @@ png_text_compress(png_structp png_ptr,
return((int)text_len);
}
/* ship the compressed text out via chunk writes */
/* 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 */
/* Handle the no-compression case */
if (comp->input)
{
png_write_chunk_data(png_ptr, (png_bytep)comp->input,
png_write_chunk_data(png_ptr, (png_bytep)comp->input,
(png_size_t)comp->input_len);
return;
return;
}
/* write saved output buffers, if any */
/* 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],
@@ -365,12 +367,12 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
if (comp->max_output_ptr != 0)
png_free(png_ptr, comp->output_ptr);
comp->output_ptr=NULL;
/* write anything left in zbuf */
/* 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_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
/* reset zlib for another zTXt/iTXt or image data */
/* Reset zlib for another zTXt/iTXt or image data */
deflateReset(&png_ptr->zstream);
png_ptr->zstream.data_type = Z_BINARY;
}
@@ -390,7 +392,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
#endif
int ret;
png_byte buf[13]; /* buffer to store the IHDR info */
png_byte buf[13]; /* Buffer to store the IHDR info */
png_debug(1, "in png_write_IHDR");
/* Check that we have valid input data from the application info */
@@ -476,7 +478,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
interlace_type=PNG_INTERLACE_NONE;
#endif
/* save off the relevent information */
/* Save 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;
@@ -489,12 +491,12 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
/* set the usr info, so any transformations can modify it */
/* 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 */
/* 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;
@@ -503,10 +505,10 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
buf[11] = (png_byte)filter_type;
buf[12] = (png_byte)interlace_type;
/* write the chunk */
/* Write the chunk */
png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
/* initialize zlib with PNG info */
/* Initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
@@ -549,13 +551,13 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
/* libpng is not interested in zstream.data_type */
/* set it to a predefined value, to avoid its evaluation inside zlib */
/* Set it to a predefined value, to avoid its evaluation inside zlib */
png_ptr->zstream.data_type = Z_BINARY;
png_ptr->mode = PNG_HAVE_IHDR;
}
/* write the palette. We are careful not to trust png_color to be in the
/* 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.
*/
@@ -622,7 +624,7 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
png_ptr->mode |= PNG_HAVE_PLTE;
}
/* write an IDAT chunk */
/* Write an IDAT chunk */
void /* PRIVATE */
png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
{
@@ -639,9 +641,11 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
unsigned int z_cmf = data[0]; /* zlib compression method and flags */
if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
{
/* Avoid memory underflows and multiplication overflows. */
/* The conditions below are practically always satisfied;
however, they still must be checked. */
/* Avoid memory underflows and multiplication overflows.
*
* The conditions below are practically always satisfied;
* however, they still must be checked.
*/
if (length >= 2 &&
png_ptr->height < 16384 && png_ptr->width < 16384)
{
@@ -674,7 +678,7 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
png_ptr->mode |= PNG_HAVE_IDAT;
}
/* write an IEND chunk */
/* Write an IEND chunk */
void /* PRIVATE */
png_write_IEND(png_structp png_ptr)
{
@@ -688,7 +692,7 @@ png_write_IEND(png_structp png_ptr)
}
#if defined(PNG_WRITE_gAMA_SUPPORTED)
/* write a gAMA chunk */
/* Write a gAMA chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void /* PRIVATE */
png_write_gAMA(png_structp png_ptr, double file_gamma)
@@ -724,7 +728,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
/* write a sRGB chunk */
/* Write a sRGB chunk */
void /* PRIVATE */
png_write_sRGB(png_structp png_ptr, int srgb_intent)
{
@@ -743,7 +747,7 @@ png_write_sRGB(png_structp png_ptr, int srgb_intent)
#endif
#if defined(PNG_WRITE_iCCP_SUPPORTED)
/* write an iCCP chunk */
/* 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)
@@ -800,7 +804,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
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 */
/* 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;
@@ -816,7 +820,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
#endif
#if defined(PNG_WRITE_sPLT_SUPPORTED)
/* write a sPLT chunk */
/* Write a sPLT chunk */
void /* PRIVATE */
png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
{
@@ -834,18 +838,17 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
#endif
png_debug(1, "in png_write_sPLT");
if ((name_len = png_check_keyword(png_ptr,
spalette->name, &new_name))==0)
return;
if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0)
return;
/* make sure we include the NULL after the name */
/* 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,
(png_size_t)(name_len + 1));
png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, (png_size_t)1);
/* loop through each palette entry, writing appropriately */
/* Loop through each palette entry, writing appropriately */
#ifndef PNG_NO_POINTER_INDEXING
for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++)
{
@@ -897,7 +900,7 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
/* write the sBIT chunk */
/* Write the sBIT chunk */
void /* PRIVATE */
png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
{
@@ -908,7 +911,7 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
png_size_t size;
png_debug(1, "in png_write_sBIT");
/* make sure we don't depend upon the order of PNG_COLOR_8 */
/* Make sure we don't depend upon the order of PNG_COLOR_8 */
if (color_type & PNG_COLOR_MASK_COLOR)
{
png_byte maxbits;
@@ -953,7 +956,7 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
/* write the cHRM chunk */
/* Write the cHRM chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void /* PRIVATE */
png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
@@ -984,21 +987,21 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
int_red_x, int_red_y, int_green_x, int_green_y, int_blue_x, int_blue_y))
#endif
{
/* each value is saved in 1/100,000ths */
png_save_uint_32(buf, int_white_x);
png_save_uint_32(buf + 4, int_white_y);
/* Each value is saved in 1/100,000ths */
png_save_uint_32(buf, int_white_x);
png_save_uint_32(buf + 4, int_white_y);
png_save_uint_32(buf + 8, int_red_x);
png_save_uint_32(buf + 12, int_red_y);
png_save_uint_32(buf + 8, int_red_x);
png_save_uint_32(buf + 12, int_red_y);
png_save_uint_32(buf + 16, int_green_x);
png_save_uint_32(buf + 20, int_green_y);
png_save_uint_32(buf + 16, int_green_x);
png_save_uint_32(buf + 20, int_green_y);
png_save_uint_32(buf + 24, int_blue_x);
png_save_uint_32(buf + 28, int_blue_y);
png_save_uint_32(buf + 24, int_blue_x);
png_save_uint_32(buf + 28, int_blue_y);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
}
#endif
@@ -1015,32 +1018,32 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_byte buf[32];
png_debug(1, "in png_write_cHRM");
/* each value is saved in 1/100,000ths */
/* Each value is saved in 1/100,000ths */
#if !defined(PNG_NO_CHECK_cHRM)
if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y,
green_x, green_y, blue_x, blue_y))
#endif
{
png_save_uint_32(buf, (png_uint_32)white_x);
png_save_uint_32(buf + 4, (png_uint_32)white_y);
png_save_uint_32(buf, (png_uint_32)white_x);
png_save_uint_32(buf + 4, (png_uint_32)white_y);
png_save_uint_32(buf + 8, (png_uint_32)red_x);
png_save_uint_32(buf + 12, (png_uint_32)red_y);
png_save_uint_32(buf + 8, (png_uint_32)red_x);
png_save_uint_32(buf + 12, (png_uint_32)red_y);
png_save_uint_32(buf + 16, (png_uint_32)green_x);
png_save_uint_32(buf + 20, (png_uint_32)green_y);
png_save_uint_32(buf + 16, (png_uint_32)green_x);
png_save_uint_32(buf + 20, (png_uint_32)green_y);
png_save_uint_32(buf + 24, (png_uint_32)blue_x);
png_save_uint_32(buf + 28, (png_uint_32)blue_y);
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);
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 */
/* 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)
@@ -1058,13 +1061,13 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
png_warning(png_ptr, "Invalid number of transparent colors specified");
return;
}
/* write the chunk out as it is */
/* 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 */
/* One 16 bit value */
if (tran->gray >= (1 << png_ptr->bit_depth))
{
png_warning(png_ptr,
@@ -1076,7 +1079,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
}
else if (color_type == PNG_COLOR_TYPE_RGB)
{
/* three 16 bit values */
/* 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);
@@ -1096,7 +1099,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
#endif
#if defined(PNG_WRITE_bKGD_SUPPORTED)
/* write the background chunk */
/* Write the background chunk */
void /* PRIVATE */
png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
{
@@ -1149,7 +1152,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
#endif
#if defined(PNG_WRITE_hIST_SUPPORTED)
/* write the histogram */
/* Write the histogram */
void /* PRIVATE */
png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
{
@@ -1249,8 +1252,8 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
while (*kp == ' ')
{
*(kp--) = '\0';
key_len--;
*(kp--) = '\0';
key_len--;
}
}
@@ -1262,8 +1265,8 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
while (*kp == ' ')
{
kp++;
key_len--;
kp++;
key_len--;
}
}
@@ -1311,7 +1314,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
#endif
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write a tEXt chunk */
/* Write a tEXt chunk */
void /* PRIVATE */
png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len)
@@ -1331,7 +1334,7 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
else
text_len = png_strlen(text);
/* make sure we include the 0 after the key */
/* 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));
/*
@@ -1351,7 +1354,7 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
#endif
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write a compressed text chunk */
/* 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)
@@ -1387,31 +1390,31 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
text_len = png_strlen(text);
/* compute the compressed data; do it now for the length */
/* 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 */
/* Write start of chunk */
png_write_chunk_start(png_ptr, (png_bytep)png_zTXt,
(png_uint_32)(key_len+text_len + 2));
/* write key */
/* Write key */
png_write_chunk_data(png_ptr, (png_bytep)new_key,
(png_size_t)(key_len + 1));
png_free(png_ptr, new_key);
buf[0] = (png_byte)compression;
/* write compression */
/* Write compression */
png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
/* write the compressed data */
/* Write the compressed data */
png_write_compressed_data_out(png_ptr, &comp);
/* close the chunk */
/* Close the chunk */
png_write_chunk_end(png_ptr);
}
#endif
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write an iTXt chunk */
/* 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)
@@ -1443,21 +1446,21 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
}
if (lang_key == NULL)
lang_key_len = 0;
lang_key_len = 0;
else
lang_key_len = png_strlen(lang_key);
lang_key_len = png_strlen(lang_key);
if (text == NULL)
text_len = 0;
else
text_len = png_strlen(text);
text_len = png_strlen(text);
/* compute the compressed data; do it now for the length */
/* 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,
/* 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,
@@ -1468,8 +1471,7 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
+ lang_key_len
+ text_len));
/*
* We leave it to the application to meet PNG-1.0 requirements on the
/* 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.
@@ -1477,13 +1479,13 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_write_chunk_data(png_ptr, (png_bytep)new_key,
(png_size_t)(key_len + 1));
/* set the compression flag */
/* 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 */
/* Set the compression method */
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, (png_size_t)2);
@@ -1501,7 +1503,7 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
#endif
#if defined(PNG_WRITE_oFFs_SUPPORTED)
/* write the oFFs chunk */
/* 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)
@@ -1523,7 +1525,7 @@ png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
}
#endif
#if defined(PNG_WRITE_pCAL_SUPPORTED)
/* write the pCAL chunk (described in the PNG extensions document) */
/* 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)
@@ -1585,7 +1587,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
#endif
#if defined(PNG_WRITE_sCAL_SUPPORTED)
/* write the sCAL chunk */
/* 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)
@@ -1648,8 +1650,8 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
}
buf[0] = (png_byte)unit;
png_memcpy(buf + 1, width, wlen + 1); /* append the '\0' here */
png_memcpy(buf + wlen + 2, height, hlen); /* do NOT append the '\0' here */
png_memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */
png_memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */
png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);
png_write_chunk(png_ptr, (png_bytep)png_sCAL, buf, total_len);
@@ -1659,7 +1661,7 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
/* write the pHYs chunk */
/* 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,
@@ -1714,24 +1716,24 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time)
}
#endif
/* initializes the row writing capability of libpng */
/* Initializes the row writing capability of libpng */
void /* PRIVATE */
png_write_start_row(png_structp png_ptr)
{
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* 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 */
/* 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 */
/* Offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
#endif
@@ -1742,13 +1744,13 @@ png_write_start_row(png_structp png_ptr)
buf_size = (png_size_t)(PNG_ROWBYTES(
png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1);
/* set up row buffer */
/* 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;
#ifndef PNG_NO_WRITE_FILTER
/* set up filtering buffer, if using this filter */
/* 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,
@@ -1759,7 +1761,7 @@ png_write_start_row(png_structp png_ptr)
/* 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 */
/* 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);
@@ -1788,7 +1790,7 @@ png_write_start_row(png_structp png_ptr)
#endif /* PNG_NO_WRITE_FILTER */
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* if interlaced, we need to set up width and height of pass */
/* If interlaced, we need to set up width and height of pass */
if (png_ptr->interlaced)
{
if (!(png_ptr->transformations & PNG_INTERLACE))
@@ -1820,18 +1822,18 @@ png_write_finish_row(png_structp png_ptr)
{
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
#ifdef PNG_USE_LOCAL_ARRAYS
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* 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 */
/* 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 */
/* Offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
#endif
@@ -1839,15 +1841,15 @@ png_write_finish_row(png_structp png_ptr)
int ret;
png_debug(1, "in png_write_finish_row");
/* next row */
/* Next row */
png_ptr->row_number++;
/* see if we are done */
/* 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 interlaced, go to next pass */
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
@@ -1857,7 +1859,7 @@ png_write_finish_row(png_structp png_ptr)
}
else
{
/* loop until we find a non-zero width or height pass */
/* Loop until we find a non-zero width or height pass */
do
{
png_ptr->pass++;
@@ -1877,7 +1879,7 @@ png_write_finish_row(png_structp png_ptr)
}
/* reset the row above the image for the next pass */
/* Reset the row above the image for the next pass */
if (png_ptr->pass < 7)
{
if (png_ptr->prev_row != NULL)
@@ -1889,16 +1891,16 @@ png_write_finish_row(png_structp png_ptr)
}
#endif
/* if we get here, we've just written the last row, so we need
/* 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 */
/* Tell the compressor we are done */
ret = deflate(&png_ptr->zstream, Z_FINISH);
/* check for an error */
/* Check for an error */
if (ret == Z_OK)
{
/* check to see if we need more room */
/* 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);
@@ -1915,7 +1917,7 @@ png_write_finish_row(png_structp png_ptr)
}
} while (ret != Z_STREAM_END);
/* write any extra space */
/* 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 -
@@ -1938,24 +1940,24 @@ 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 */
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
/* Start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
/* 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");
/* we don't have to do anything on the last pass (6) */
/* 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 */
/* Each pixel depth is handled separately */
switch (row_info->pixel_depth)
{
case 1:
@@ -2066,27 +2068,27 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
png_uint_32 row_width = row_info->width;
png_size_t pixel_bytes;
/* start at the beginning */
/* Start at the beginning */
dp = row;
/* find out how many bytes each pixel takes up */
/* 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
/* 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 */
/* Find out where the original pixel is */
sp = row + (png_size_t)i * pixel_bytes;
/* move the pixel */
/* Move the pixel */
if (dp != sp)
png_memcpy(dp, sp, pixel_bytes);
/* next pixel */
/* Next pixel */
dp += pixel_bytes;
}
break;
}
}
/* set new row width */
/* Set new row width */
row_info->width = (row_info->width +
png_pass_inc[pass] - 1 -
png_pass_start[pass]) /
@@ -2119,7 +2121,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#endif
png_debug(1, "in png_write_find_filter");
/* find out how many bytes offset each pixel is */
/* Find out how many bytes offset each pixel is */
bpp = (row_info->pixel_depth + 7) >> 3;
prev_row = png_ptr->prev_row;
@@ -2206,9 +2208,9 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
mins = sum;
}
/* sub filter */
/* Sub filter */
if (filter_to_do == PNG_FILTER_SUB)
/* it's the only filter so no testing is needed */
/* It's the only filter so no testing is needed */
{
png_bytep rp, lp, dp;
png_uint_32 i;
@@ -2323,7 +2325,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
}
/* up filter */
/* Up filter */
if (filter_to_do == PNG_FILTER_UP)
{
png_bytep rp, dp, pp;
@@ -2426,7 +2428,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
}
/* avg filter */
/* Avg filter */
if (filter_to_do == PNG_FILTER_AVG)
{
png_bytep rp, dp, pp, lp;
@@ -2729,18 +2731,18 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
{
png_debug(1, "in png_write_filtered_row");
png_debug1(2, "filter = %d", filtered_row[0]);
/* set up the zlib input buffer */
/* 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 */
/* Repeat until we have compressed all the data */
do
{
int ret; /* return of zlib */
int ret; /* Return of zlib */
/* compress the data */
/* Compress the data */
ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
/* check for compression errors */
/* Check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream.msg != NULL)
@@ -2749,18 +2751,18 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
png_error(png_ptr, "zlib error");
}
/* see if it is time to write another IDAT */
/* See if it is time to write another IDAT */
if (!(png_ptr->zstream.avail_out))
{
/* write the IDAT and reset the zlib output buffer */
/* 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 */
/* Repeat until all data has been compressed */
} while (png_ptr->zstream.avail_in);
/* swap the current and previous rows */
/* Swap the current and previous rows */
if (png_ptr->prev_row != NULL)
{
png_bytep tptr;
@@ -2770,7 +2772,7 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
png_ptr->row_buf = tptr;
}
/* finish row - updates counters and flushes zlib if last row */
/* Finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr);
#if defined(PNG_WRITE_FLUSH_SUPPORTED)