[devel] Revised png_check_IHDR() again
to check info_ptr members instead of the contents of the returned parameters.
This commit is contained in:
Glenn Randers-Pehrson
parent
b91c634df1
commit
b35a745561
6
ANNOUNCE
6
ANNOUNCE
@ -1,5 +1,5 @@
|
||||
|
||||
Libpng 1.4.0beta85 - September 30, 2009
|
||||
Libpng 1.4.0beta85 - October 1, 2009
|
||||
|
||||
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.
|
||||
@ -570,7 +570,9 @@ version 1.4.0beta84 [September 30, 2009]
|
||||
Fixed some inconsistent indentation in pngconf.h
|
||||
Revised png_check_IHDR() to add a test for width variable less than 32-bit.
|
||||
|
||||
version 1.4.0beta85 [September 30, 2009]
|
||||
version 1.4.0beta85 [October 1, 2009]
|
||||
Revised png_check_IHDR() again, to check info_ptr members instead of
|
||||
the contents of the returned parameters.
|
||||
|
||||
version 1.4.0betaN [future]
|
||||
Build shared libraries with -lz and sometimes -lm.
|
||||
|
||||
4
CHANGES
4
CHANGES
@ -2256,7 +2256,9 @@ version 1.4.0beta84 [September 30, 2009]
|
||||
Fixed some inconsistent indentation in pngconf.h
|
||||
Revised png_check_IHDR() to add a test for width variable less than 32-bit.
|
||||
|
||||
version 1.4.0beta85 [September 30, 2009]
|
||||
version 1.4.0beta85 [October 1, 2009]
|
||||
Revised png_check_IHDR() again, to check info_ptr members instead of
|
||||
the contents of the returned parameters.
|
||||
|
||||
version 1.4.0betaN [future]
|
||||
Build shared libraries with -lz and sometimes -lm.
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
libpng.txt - A description on how to use and modify libpng
|
||||
|
||||
libpng version 1.4.0beta85 - September 30, 2009
|
||||
libpng version 1.4.0beta85 - October 1, 2009
|
||||
Updated and distributed by Glenn Randers-Pehrson
|
||||
<glennrp at users.sourceforge.net>
|
||||
Copyright (c) 1998-2009 Glenn Randers-Pehrson
|
||||
@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
|
||||
|
||||
Based on:
|
||||
|
||||
libpng versions 0.97, January 1998, through 1.4.0beta85 - September 30, 2009
|
||||
libpng versions 0.97, January 1998, through 1.4.0beta85 - October 1, 2009
|
||||
Updated and distributed by Glenn Randers-Pehrson
|
||||
Copyright (c) 1998-2009 Glenn Randers-Pehrson
|
||||
|
||||
@ -557,10 +557,33 @@ in until png_read_end() has read the chunk data following the image.
|
||||
for PNG 1.0)
|
||||
interlace_type - (PNG_INTERLACE_NONE or
|
||||
PNG_INTERLACE_ADAM7)
|
||||
Any or all of interlace_type, compression_type, of
|
||||
|
||||
Any or all of interlace_type, compression_type, or
|
||||
filter_method can be NULL if you are
|
||||
not interested in their values.
|
||||
|
||||
Note that png_get_IHDR() returns 32-bit data into
|
||||
the application's width and height variables.
|
||||
This is an unsafe situation if these are 16-bit
|
||||
variables. In such situations, the
|
||||
png_get_image_width() and png_get_image_height()
|
||||
functions described below are safer.
|
||||
|
||||
width = png_get_image_width(png_ptr,
|
||||
info_ptr);
|
||||
height = png_get_image_height(png_ptr,
|
||||
info_ptr);
|
||||
bit_depth = png_get_bit_depth(png_ptr,
|
||||
info_ptr);
|
||||
color_type = png_get_color_type(png_ptr,
|
||||
info_ptr);
|
||||
filter_method = png_get_filter_type(png_ptr,
|
||||
info_ptr);
|
||||
compression_type = png_get_compression_type(png_ptr,
|
||||
info_ptr);
|
||||
interlace_type = png_get_interlace_type(png_ptr,
|
||||
info_ptr);
|
||||
|
||||
channels = png_get_channels(png_ptr, info_ptr);
|
||||
channels - number of channels of info for the
|
||||
color type (valid values are 1 (GRAY,
|
||||
@ -580,23 +603,6 @@ in until png_read_end() has read the chunk data following the image.
|
||||
be in signature[4] through signature[7]
|
||||
(see png_set_sig_bytes())).
|
||||
|
||||
|
||||
width = png_get_image_width(png_ptr,
|
||||
info_ptr);
|
||||
height = png_get_image_height(png_ptr,
|
||||
info_ptr);
|
||||
bit_depth = png_get_bit_depth(png_ptr,
|
||||
info_ptr);
|
||||
color_type = png_get_color_type(png_ptr,
|
||||
info_ptr);
|
||||
filter_method = png_get_filter_type(png_ptr,
|
||||
info_ptr);
|
||||
compression_type = png_get_compression_type(png_ptr,
|
||||
info_ptr);
|
||||
interlace_type = png_get_interlace_type(png_ptr,
|
||||
info_ptr);
|
||||
|
||||
|
||||
These are also important, but their validity depends on whether the chunk
|
||||
has been read. The png_get_valid(png_ptr, info_ptr, PNG_INFO_<chunk>) and
|
||||
png_get_<chunk>(png_ptr, info_ptr, ...) functions return non-zero if the
|
||||
@ -3205,7 +3211,7 @@ source.
|
||||
|
||||
XIII. Y2K Compliance in libpng
|
||||
|
||||
September 30, 2009
|
||||
October 1, 2009
|
||||
|
||||
Since the PNG Development group is an ad-hoc body, we can't make
|
||||
an official declaration.
|
||||
|
||||
14
png.c
14
png.c
@ -1,7 +1,7 @@
|
||||
|
||||
/* png.c - location for general purpose libpng functions
|
||||
*
|
||||
* Last changed in libpng 1.4.0 [September 30, 2009]
|
||||
* Last changed in libpng 1.4.0 [October 1, 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.)
|
||||
@ -547,13 +547,13 @@ png_get_copyright(png_structp png_ptr)
|
||||
#else
|
||||
#ifdef __STDC__
|
||||
return ((png_charp) PNG_STRING_NEWLINE \
|
||||
"libpng version x 1.4.0beta85 - September 30, 2009" PNG_STRING_NEWLINE \
|
||||
"libpng version x 1.4.0beta85 - October 1, 2009" PNG_STRING_NEWLINE \
|
||||
"Copyright (c) 1998-2009 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
|
||||
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
|
||||
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
|
||||
PNG_STRING_NEWLINE);
|
||||
#else
|
||||
return ((png_charp) "libpng version 1.4.0beta85 - September 30, 2009\
|
||||
return ((png_charp) "libpng version 1.4.0beta85 - October 1, 2009\
|
||||
Copyright (c) 1998-2009 Glenn Randers-Pehrson\
|
||||
Copyright (c) 1996-1997 Andreas Dilger\
|
||||
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.");
|
||||
@ -796,14 +796,6 @@ png_check_IHDR(png_structp png_ptr,
|
||||
#endif
|
||||
{
|
||||
png_warning(png_ptr, "Image width exceeds user limit in IHDR");
|
||||
if ((width >> 16) == height)
|
||||
{
|
||||
/* This is likely to be caused by passing consecutive addresses
|
||||
* of 16-bit width and height variables to png_get_IHDR(), which
|
||||
* overflowed when we tried to fill them with 31-bit data.
|
||||
*/
|
||||
png_warning(png_ptr, "High bytes of width == low bytes of height");
|
||||
}
|
||||
error = 1;
|
||||
}
|
||||
|
||||
|
||||
26
pngget.c
26
pngget.c
@ -1,7 +1,7 @@
|
||||
|
||||
/* pngget.c - retrieval of values from info struct
|
||||
*
|
||||
* Last changed in libpng 1.4.0 [September 30, 2009]
|
||||
* Last changed in libpng 1.4.0 [October 1, 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.)
|
||||
@ -579,10 +579,6 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
|
||||
int *filter_type)
|
||||
|
||||
{
|
||||
int test_interlace_type = 0;
|
||||
int test_compression_type = 0;
|
||||
int test_filter_type = 0;
|
||||
|
||||
png_debug1(1, "in %s retrieval function", "IHDR");
|
||||
|
||||
if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
|
||||
@ -595,26 +591,22 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
|
||||
*color_type = info_ptr->color_type;
|
||||
|
||||
if (compression_type != NULL)
|
||||
{
|
||||
*compression_type = info_ptr->compression_type;
|
||||
test_compression_type=*compression_type;
|
||||
}
|
||||
|
||||
if (filter_type != NULL)
|
||||
{
|
||||
*filter_type = info_ptr->filter_type;
|
||||
test_filter_type=*filter_type;
|
||||
}
|
||||
|
||||
if (interlace_type != NULL)
|
||||
{
|
||||
*interlace_type = info_ptr->interlace_type;
|
||||
test_interlace_type=*interlace_type;
|
||||
}
|
||||
|
||||
png_check_IHDR (png_ptr, *width, *height, *bit_depth, *color_type,
|
||||
info_ptr->interlace_type, info_ptr->compression_type,
|
||||
info_ptr->filter_type);
|
||||
/* This is redundant if we can be sure that the info_ptr values were all
|
||||
* assigned in png_set_IHDR(). We do the check anyhow in case an
|
||||
* application has ignored our advice not to mess with the members
|
||||
* of info_ptr directly.
|
||||
*/
|
||||
png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
|
||||
info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
|
||||
info_ptr->compression_type, info_ptr->filter_type);
|
||||
|
||||
return (1);
|
||||
}
|
||||
|
||||
12
pngset.c
12
pngset.c
@ -1,7 +1,7 @@
|
||||
|
||||
/* pngset.c - storage of image information into info struct
|
||||
*
|
||||
* Last changed in libpng 1.4.0 [September 30, 2009]
|
||||
* Last changed in libpng 1.4.0 [October 1, 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.)
|
||||
@ -227,16 +227,18 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
|
||||
if (png_ptr == NULL || info_ptr == NULL)
|
||||
return;
|
||||
|
||||
png_check_IHDR (png_ptr, width, height, bit_depth, color_type,
|
||||
interlace_type, compression_type, filter_type);
|
||||
|
||||
info_ptr->width = width;
|
||||
info_ptr->height = height;
|
||||
info_ptr->bit_depth = (png_byte)bit_depth;
|
||||
info_ptr->color_type =(png_byte) color_type;
|
||||
info_ptr->color_type = (png_byte)color_type;
|
||||
info_ptr->compression_type = (png_byte)compression_type;
|
||||
info_ptr->filter_type = (png_byte)filter_type;
|
||||
info_ptr->interlace_type = (png_byte)interlace_type;
|
||||
|
||||
png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
|
||||
info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
|
||||
info_ptr->compression_type, info_ptr->filter_type);
|
||||
|
||||
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
||||
info_ptr->channels = 1;
|
||||
else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user