diff -r -U 3 libpng-1.2.5/png.h libpng-1.2.5patch04/png.h --- libpng-1.2.5/png.h Thu Oct 3 06:32:26 2002 +++ libpng-1.2.5patch04/png.h Fri Jul 23 18:56:27 2004 @@ -833,7 +833,11 @@ typedef png_info FAR * FAR * png_infopp; /* Maximum positive integer used in PNG is (2^31)-1 */ -#define PNG_MAX_UINT ((png_uint_32)0x7fffffffL) +#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) +#define PNG_UINT_32_MAX (~((png_uint_32)0)) +#define PNG_SIZE_MAX (~((png_size_t)0)) +/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ +#define PNG_MAX_UINT PNG_UINT_31_MAX /* These describe the color_type field in png_info. */ /* color type masks */ @@ -2655,6 +2659,8 @@ PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ +PNG_EXTERN png_uint_32 png_get_uint_31 PNGARG((png_structp png_ptr, + png_bytep buf)); /* Initialize png_ptr struct for reading, and allocate any other memory. * (old interface - DEPRECATED - use png_create_read_struct instead). diff -r -U 3 libpng-1.2.5/pngrutil.c libpng-1.2.5patch04/pngrutil.c --- libpng-1.2.5/pngrutil.c Thu Oct 3 06:32:30 2002 +++ libpng-1.2.5patch04/pngrutil.c Fri Jul 23 18:56:27 2004 @@ -38,6 +38,14 @@ # endif #endif +png_uint_32 /* PRIVATE */ +png_get_uint_31(png_structp png_ptr, png_bytep buf) +{ + png_uint_32 i = png_get_uint_32(buf); + if (i > PNG_UINT_31_MAX) + png_error(png_ptr, "PNG unsigned integer out of range.\n"); + return (i); +} #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */ png_uint_32 /* PRIVATE */