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[libpng16] Made png_user_version_check() ok to use with libpng version 1.10.x

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and later.
This commit is contained in:
Glenn Randers-Pehrson
2012-11-22 16:58:30 -06:00
parent 70850fce0c
commit 5f4b95e513
3 changed files with 17 additions and 13 deletions
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22
png.c
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@@ -128,10 +128,10 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
need_crc = 0;
}
/* 'uLong' is defined as unsigned long, this means that on some systems it is
* a 64 bit value. crc32, however, returns 32 bits so the following cast is
* safe. 'uInt' may be no more than 16 bits, so it is necessary to perform a
* loop here.
/* 'uLong' is defined in zlib.h as unsigned long; this means that on some
* systems it is a 64 bit value. crc32, however, returns 32 bits so the
* following cast is safe. 'uInt' may be no more than 16 bits, so it is
* necessary to perform a loop here.
*/
if (need_crc && length > 0)
{
@@ -145,7 +145,7 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
crc = crc32(crc, ptr, safe_length);
/* The following should never issue compiler warnings, if they do the
/* The following should never issue compiler warnings; if they do the
* target system has characteristics that will probably violate other
* assumptions within the libpng code.
*/
@@ -160,7 +160,7 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
}
/* Check a user supplied version number, called from both read and write
* functions that create a png_struct
* functions that create a png_struct.
*/
int
png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver)
@@ -184,10 +184,12 @@ png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver)
/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
* we must recompile any applications that use any older library version.
* For versions after libpng 1.0, we will be compatible, so we need
* only check the first digit.
* only check the first and third digits (note that when we reach version
* 1.10 we will need to check the fourth symbol, namely user_png_ver[3]).
*/
if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
(user_png_ver[0] == '1' && (user_png_ver[2] != png_libpng_ver[2] ||
user_png_ver[3] != png_libpng_ver[3])) ||
(user_png_ver[0] == '0' && user_png_ver[2] < '9'))
{
#ifdef PNG_WARNINGS_SUPPORTED
@@ -766,13 +768,13 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.6.0beta32 - November 1, 2012" PNG_STRING_NEWLINE \
"libpng version 1.6.0beta32 - November 22, 2012" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2012 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 "libpng version 1.6.0beta32 - November 1, 2012\
return "libpng version 1.6.0beta32 - November 22, 2012\
Copyright (c) 1998-2012 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";