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[devel] Re-initialize the zlib compressor before compressing non-IDAT chunks.

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This commit is contained in:
Glenn Randers-Pehrson 2011-03-31 20:14:29 -05:00
parent dcc3505c7b
commit 6b3d50b2cd
9 changed files with 239 additions and 91 deletions
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51
ANNOUNCE
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@ -1,60 +1,35 @@
Libpng 1.5.2 - March 31, 2011
Libpng 1.5.3beta01 - April 1, 2011
This is a public release of libpng, intended for use in production codes.
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
Files available for download:
Source files with LF line endings (for Unix/Linux) and with a
"configure" script
libpng-1.5.2.tar.xz (LZMA-compressed, recommended)
libpng-1.5.2.tar.gz
libpng-1.5.2.tar.bz2
1.5.3beta01.tar.xz (LZMA-compressed, recommended)
1.5.3beta01.tar.gz
1.5.3beta01.tar.bz2
Source files with CRLF line endings (for Windows), without the
"configure" script
lpng152.7z (LZMA-compressed, recommended)
lpng152.zip
lp153b01.7z (LZMA-compressed, recommended)
lp153b01.zip
Other information:
libpng-1.5.2-README.txt
libpng-1.5.2-LICENSE.txt
1.5.3beta01-README.txt
1.5.3beta01-LICENSE.txt
Changes since the last public release (1.5.2):
More -Wshadow fixes for older gcc compilers. Older gcc versions apparently
check formal parameters names in function declarations (as well as
definitions) to see if they match a name in the global namespace.
Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
old VisualC++ preprocessor.
Turned on interlace handling in png_read_png().
Fixed gcc pendantic warnings.
Handle longjmp in Cygwin.
Fixed png_get_current_row_number() in the interlaced case.
Cleaned up ALPHA flags and transformations.
Implemented expansion to 16 bits.
Fixed mistake in the descriptions of user read_transform and write_transform
function prototypes in the manual. The row_info struct is png_row_infop.
Corrected png_get_current_row_number documentation
Fixed the read/write row callback documentation.
This documents the current behavior, where the callback is called after
every row with information pertaining to the next row.
Fixed scripts/makefile.vcwin32
Updated contrib/pngsuite/README to add the word "modify".
Define PNG_ALLOCATED and other attributes to blank when _MSC_VER<1300.
ifdef out mask arrays in pngread.c when interlacing is not supported.
Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
from the makefiles.
Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
Don't include standard header files in png.h while building the symbol table,
to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
Version 1.5.3beta01 [April 1, 2011]
Re-initialize the zlib compressor before compressing non-IDAT chunks.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
to subscribe) or to glennrp at users.sourceforge.net

4
CHANGES
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@ -3285,6 +3285,10 @@ Version 1.5.2rc03 [March 24, 2011]
to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
Version 1.5.2 [March 31, 2011]
No changes.
Version 1.5.3beta01 [April 1, 2011]
Re-initialize the zlib compressor before compressing non-IDAT chunks.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

40
png.h
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@ -1,7 +1,7 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.5.2 - March 31, 2011
* libpng version 1.5.3beta01 - April 1, 2011
* Copyright (c) 1998-2011 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.)
@ -11,7 +11,7 @@
* 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 1.5.2 - March 31, 2011: Glenn
* libpng versions 0.97, January 1998, through 1.5.3beta01 - April 1, 2011: Glenn
* See also "Contributing Authors", below.
*
* Note about libpng version numbers:
@ -181,7 +181,7 @@
*
* This code is released under the libpng license.
*
* libpng versions 1.2.6, August 15, 2004, through 1.5.2, March 31, 2011, are
* libpng versions 1.2.6, August 15, 2004, through 1.5.3beta01, April 1, 2011, are
* Copyright (c) 2004, 2006-2011 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:
@ -293,13 +293,13 @@
* Y2K compliance in libpng:
* =========================
*
* March 31, 2011
* April 1, 2011
*
* 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 1.5.2 are Y2K compliant. It is my belief that
* upward through 1.5.3beta01 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
@ -355,9 +355,9 @@
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.5.2"
#define PNG_LIBPNG_VER_STRING "1.5.3beta01"
#define PNG_HEADER_VERSION_STRING \
" libpng version 1.5.2 - March 31, 2011\n"
" libpng version 1.5.3beta01 - April 1, 2011\n"
#define PNG_LIBPNG_VER_SONUM 15
#define PNG_LIBPNG_VER_DLLNUM 15
@ -365,12 +365,12 @@
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
#define PNG_LIBPNG_VER_MAJOR 1
#define PNG_LIBPNG_VER_MINOR 5
#define PNG_LIBPNG_VER_RELEASE 2
#define PNG_LIBPNG_VER_RELEASE 3
/* 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
@ -395,7 +395,7 @@
* 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 10502 /* 1.5.2 */
#define PNG_LIBPNG_VER 10503 /* 1.5.3 */
/* Library configuration: these options cannot be changed after
* the library has been built.
@ -517,7 +517,7 @@ extern "C" {
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
typedef char* png_libpng_version_1_5_2;
typedef char* png_libpng_version_1_5_3beta01;
/* Three color definitions. The order of the red, green, and blue, (and the
* exact size) is not important, although the size of the fields need to
@ -1413,6 +1413,24 @@ PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr,
PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr,
int method));
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
/* Also set zlib parameters for compressing non-IDAT chunks */
PNG_EXPORT(222, void, png_set_text_compression_level,
(png_structp png_ptr, int level));
PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr,
int mem_level));
PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr,
int strategy));
PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp
png_ptr, int window_bits));
PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr,
int method));
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
/* These next functions are called for input/output, memory, and error
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
* and call standard C I/O routines such as fread(), fwrite(), and

2
pngconf.h
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@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng version 1.5.2 - March 31, 2011
* libpng version 1.5.3beta01 - March 31, 2011
*
* Copyright (c) 1998-2011 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

21
pngmem.c
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@ -187,8 +187,9 @@ png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
int num_blocks;
png_uint_32 total_size;
png_bytep table;
int i;
int i, mem_level, window_bits;
png_byte huge * hptr;
int window_bits
if (ret != NULL)
{
@ -196,14 +197,22 @@ png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
ret = NULL;
}
if (png_ptr->zlib_window_bits > 14)
num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
window_bits =
png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ?
png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits;
if (window_bits > 14)
num_blocks = (int)(1 << (window_bits - 14));
else
num_blocks = 1;
if (png_ptr->zlib_mem_level >= 7)
num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
mem_level =
png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ?
png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level;
if (mem_level >= 7)
num_blocks += (int)(1 << (mem_level - 7));
else
num_blocks++;
@ -277,7 +286,7 @@ png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
{
# ifndef PNG_USER_MEM_SUPPORTED
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */
png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */
else
png_warning(png_ptr, "Out of Memory");

10
pngpriv.h
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@ -345,11 +345,11 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
/* 0x200000L unused */
/* 0x400000L unused */
#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
/* 0x1000000L unused */
/* 0x2000000L unused */
/* 0x4000000L unused */
/* 0x8000000L unused */
/* 0x10000000L unused */
#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000L /* 5 lines added */
#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000L /* to libpng-1.5.2 */
#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000L
#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000L
#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000L
/* 0x20000000L unused */
/* 0x40000000L unused */

7
pngstruct.h
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@ -69,6 +69,13 @@ struct png_struct_def
int zlib_window_bits; /* holds zlib compression window bits */
int zlib_mem_level; /* holds zlib compression memory level */
int zlib_strategy; /* holds zlib compression strategy */
/* Added at libpng 1.5.2 */
int zlib_text_level; /* holds zlib compression level */
int zlib_text_method; /* holds zlib compression method */
int zlib_text_window_bits; /* holds zlib compression window bits */
int zlib_text_mem_level; /* holds zlib compression memory level */
int zlib_text_strategy; /* holds zlib compression strategy */
/* End of material added at libpng 1.5.2 */
png_uint_32 width; /* width of image in pixels */
png_uint_32 height; /* height of image in pixels */

82
pngwrite.c
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@ -1,7 +1,7 @@
/* pngwrite.c - general routines to write a PNG file
*
* Last changed in libpng 1.5.1 [February 3, 2011]
* Last changed in libpng 1.5.3 [(PENDING RELEASE)]
* Copyright (c) 1998-2011 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.)
@ -1491,6 +1491,86 @@ png_set_compression_method(png_structp png_ptr, int method)
png_ptr->zlib_method = method;
}
/* The following were added to libpng-1.5.2 */
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
void PNGAPI
png_set_text_compression_level(png_structp png_ptr, int level)
{
png_debug(1, "in png_set_text_compression_level");
if (png_ptr == NULL)
return;
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL;
png_ptr->zlib_text_level = level;
}
void PNGAPI
png_set_text_compression_mem_level(png_structp png_ptr, int mem_level)
{
png_debug(1, "in png_set_text_compression_mem_level");
if (png_ptr == NULL)
return;
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL;
png_ptr->zlib_text_mem_level = mem_level;
}
void PNGAPI
png_set_text_compression_strategy(png_structp png_ptr, int strategy)
{
png_debug(1, "in png_set_text_compression_strategy");
if (png_ptr == NULL)
return;
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY;
png_ptr->zlib_text_strategy = strategy;
}
void PNGAPI
png_set_text_compression_window_bits(png_structp png_ptr, int window_bits)
{
if (png_ptr == NULL)
return;
if (window_bits > 15)
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
else if (window_bits < 8)
png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
#ifndef WBITS_8_OK
/* Avoid libpng bug with 256-byte windows */
if (window_bits == 8)
{
png_warning(png_ptr, "Text compression window is being reset to 512");
window_bits = 9;
}
#endif
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS;
png_ptr->zlib_text_window_bits = window_bits;
}
void PNGAPI
png_set_text_compression_method(png_structp png_ptr, int method)
{
png_debug(1, "in png_set_text_compression_method");
if (png_ptr == NULL)
return;
if (method != 8)
png_warning(png_ptr, "Only compression method 8 is supported by PNG");
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_METHOD;
png_ptr->zlib_text_method = method;
}
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
/* end of API added to libpng-1.5.2 */
void PNGAPI
png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
{

109
pngwutil.c
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@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* Last changed in libpng 1.5.0 [January 6, 2011]
* Last changed in libpng 1.5.3 [(PENDING RELEASE)]
* Copyright (c) 1998-2011 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.)
@ -256,9 +256,33 @@ png_text_compress(png_structp png_ptr,
* wouldn't cause a failure, just a slowdown due to swapping).
*/
/* Initialize the compressor. To do: Why do we need this? */
ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_text_level,
png_ptr->zlib_text_method, png_ptr->zlib_text_window_bits,
png_ptr->zlib_text_mem_level, png_ptr->zlib_text_strategy);
if (ret != Z_OK)
{
if (ret == Z_VERSION_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor for text-- version error");
if (ret == Z_STREAM_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor for text-- stream error");
if (ret == Z_MEM_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor for text-- mem error");
png_error(png_ptr, "zlib failed to initialize compressor for text");
}
/* Set up the compression buffers */
/* TODO: the following cast hides a potential overflow problem. */
png_ptr->zstream.avail_in = (uInt)text_len;
/* NOTE: assume zlib doesn't overwrite the input */
png_ptr->zstream.next_in = (Bytef *)text;
png_ptr->zstream.avail_out = png_ptr->zbuf_size;
@ -437,7 +461,6 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
/* Reset zlib for another zTXt/iTXt or image data */
deflateReset(&png_ptr->zstream);
png_ptr->zstream.data_type = Z_BINARY;
}
#endif
@ -632,34 +655,34 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
png_ptr->zlib_method = 8;
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_STRATEGY))
png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY;
if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_LEVEL))
png_ptr->zlib_text_level = Z_DEFAULT_COMPRESSION;
if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL))
png_ptr->zlib_text_mem_level = 8;
if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS))
png_ptr->zlib_text_window_bits = 15;
if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_METHOD))
png_ptr->zlib_text_method = 8;
#else
png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY;
png_ptr->zlib_text_level = Z_DEFAULT_COMPRESSION;
png_ptr->zlib_text_mem_level = 8;
png_ptr->zlib_text_window_bits = 15;
png_ptr->zlib_text_method = 8;
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
/* Initialize the zlib compressor */
ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
png_ptr->zlib_method, png_ptr->zlib_window_bits,
png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
if (ret != Z_OK)
{
if (ret == Z_VERSION_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor -- version error");
if (ret == Z_STREAM_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor -- stream error");
if (ret == Z_MEM_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor -- mem error");
png_error(png_ptr, "zlib failed to initialize compressor");
}
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, so 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;
}
@ -750,7 +773,39 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
if (!(png_ptr->mode & PNG_HAVE_IDAT) &&
png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
{
unsigned int z_cmf = data[0]; /* zlib compression method and flags */
int ret;
unsigned int z_cmf; /* zlib compression method and flags */
ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
png_ptr->zlib_method, png_ptr->zlib_window_bits,
png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
if (ret != Z_OK)
{
if (ret == Z_VERSION_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor -- version error");
if (ret == Z_STREAM_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor -- stream error");
if (ret == Z_MEM_ERROR)
png_error(png_ptr,
"zlib failed to initialize compressor -- mem error");
png_error(png_ptr, "zlib failed to initialize compressor");
}
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, so set it
* to a predefined value, to avoid its evaluation inside zlib
*/
png_ptr->zstream.data_type = Z_BINARY;
z_cmf = data[0];
if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
{
/* Avoid memory underflows and multiplication overflows.