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Imported from libpng-0.88.tar

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Guy Schalnat
1996-01-26 01:38:47 -06:00
committed by Glenn Randers-Pehrson
parent 4ee97b0891
commit b2e01bd505
36 changed files with 3932 additions and 2578 deletions
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50
png.c
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@@ -1,10 +1,10 @@
/* png.c - location for general purpose png functions
libpng 1.0 beta 2 - version 0.87
libpng 1.0 beta 2 - version 0.88
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 15, 1996
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 25, 1996
*/
#define PNG_INTERNAL
@@ -13,7 +13,7 @@
/* version information for c files. This better match the version
string defined in png.h */
char png_libpng_ver[] = "0.87";
char png_libpng_ver[] = "0.88";
/* place to hold the signiture string for a png file. */
png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -95,7 +95,7 @@ int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
int
png_check_sig(png_bytep sig, int num)
{
if (num > 8)
if (num > 8)
num = 8;
if (num < 1)
return 0;
@@ -107,22 +107,22 @@ png_check_sig(png_bytep sig, int num)
voidpf
png_zalloc(voidpf png_ptr, uInt items, uInt size)
{
png_voidp ptr;
png_uint_32 num_bytes;
png_voidp ptr;
png_uint_32 num_bytes;
ptr = png_large_malloc((png_structp)png_ptr,
(png_uint_32)items * (png_uint_32)size);
num_bytes = (png_uint_32)items * (png_uint_32)size;
if (num_bytes > (png_uint_32)0x7fff)
{
png_memset(ptr, 0, (png_size_t)0x8000L);
png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
(png_size_t)(num_bytes - (png_uint_32)0x8000L));
}
else
{
png_memset(ptr, 0, (png_size_t)num_bytes);
}
ptr = png_large_malloc((png_structp)png_ptr,
(png_uint_32)items * (png_uint_32)size);
num_bytes = (png_uint_32)items * (png_uint_32)size;
if (num_bytes > (png_uint_32)0x7fff)
{
png_memset(ptr, 0, (png_size_t)0x8000L);
png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
(png_size_t)(num_bytes - (png_uint_32)0x8000L));
}
else
{
png_memset(ptr, 0, (png_size_t)num_bytes);
}
return (voidpf)(ptr);
}
@@ -130,7 +130,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
void
png_zfree(voidpf png_ptr, voidpf ptr)
{
png_large_free((png_structp)png_ptr, (png_voidp)ptr);
png_large_free((png_structp)png_ptr, (png_voidp)ptr);
}
/* reset the crc variable to 32 bits of 1's. Care must be taken
@@ -143,8 +143,8 @@ png_reset_crc(png_structp png_ptr)
}
/* Note: the crc code below was copied from the sample code in the
PNG spec, with appropriate modifications made to ensure the
variables are large enough */
PNG spec, with appropriate modifications made to ensure the
variables are large enough */
/* table of crc's of all 8-bit messages. If you wish to png_malloc this
table, turn this into a pointer, and png_malloc it in make_crc_table().
@@ -193,7 +193,7 @@ update_crc(png_uint_32 crc, png_bytep buf, png_uint_32 len)
if (n > 0) do
{
c = crc_table[(png_byte)((c ^ (*p++)) & 0xff)] ^ (c >> 8);
c = crc_table[(png_byte)((c ^ (*p++)) & 0xff)] ^ (c >> 8);
} while (--n);
return c;
@@ -213,6 +213,6 @@ void
png_info_init(png_infop info)
{
/* set everything to 0 */
png_memset(info, 0, sizeof (png_info));
png_memset(info, 0, sizeof (png_info));
}