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Imported from libpng-1.4.0beta25.tar

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This commit is contained in:
Glenn Randers-Pehrson
2008-07-30 14:47:09 -05:00
parent 895a9c97e2
commit eb58091392
105 changed files with 22957 additions and 25094 deletions
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24
pngrutil.c
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@@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.4.0 [July 25, 2008]
* Last changed in libpng 1.4.0 [July 30, 2008]
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -19,20 +19,12 @@
png_uint_32 PNGAPI
png_get_uint_31(png_structp png_ptr, png_bytep buf)
{
#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
png_uint_32 i = png_get_uint_32(buf);
#else
/* Avoid an extra function call by inlining the result. */
png_uint_32 i = ((png_uint_32)(*buf) << 24) +
((png_uint_32)(*(buf + 1)) << 16) +
((png_uint_32)(*(buf + 2)) << 8) +
(png_uint_32)(*(buf + 3));
#endif
if (i > PNG_UINT_31_MAX)
png_error(png_ptr, "PNG unsigned integer out of range");
return (i);
}
#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
#ifndef PNG_USE_READ_MACROS
/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
png_uint_32 PNGAPI
png_get_uint_32(png_bytep buf)
@@ -45,7 +37,6 @@ png_get_uint_32(png_bytep buf)
return (i);
}
#if defined(PNG_GET_INT_32_SUPPORTED)
/* 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. */
@@ -59,7 +50,6 @@ png_get_int_32(png_bytep buf)
return (i);
}
#endif
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
png_uint_16 PNGAPI
@@ -70,7 +60,7 @@ png_get_uint_16(png_bytep buf)
return (i);
}
#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
#endif /* PNG_USE_READ_MACROS */
/* Read the chunk header (length + type name).
* Put the type name into png_ptr->chunk_name, and return the length.
@@ -2237,11 +2227,6 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->mode |= PNG_AFTER_IDAT;
}
#if 0
/* Redundant? */
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
#endif
if (!(png_ptr->chunk_name[0] & 0x20))
{
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@@ -2322,14 +2307,13 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
the chunk name itself is valid. */
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
#define isnonupper(c) ((c) < 65 || (c) > 90)
void /* PRIVATE */
png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
{
png_debug(1, "in png_check_chunk_name\n");
if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
isnonupper(chunk_name[2]) || isnonalpha(chunk_name[3]))
isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3]))
{
png_chunk_error(png_ptr, "invalid chunk type");
}