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/* checksum-icc.c
*
* Copyright (c) 2013 John Cunningham Bowler
*
* Last changed in libpng 1.6.0 [February 14, 2013]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Generate crc32 and adler32 checksums of the given input files, used to
* generate check-codes for use when matching ICC profiles within libpng.
*/
#include <stdio.h>
#include <zlib.h>
static int
read_one_file(FILE *ip, const char *name)
{
uLong length = 0;
uLong a32 = adler32(0, NULL, 0);
uLong c32 = crc32(0, NULL, 0);
Byte header[132];
for (;;)
{
int ch = getc(ip);
Byte b;
if (ch == EOF) break;
b = (Byte)ch;
if (length < sizeof header)
header[length] = b;
++length;
a32 = adler32(a32, &b, 1);
c32 = crc32(c32, &b, 1);
}
if (ferror(ip))
return 0;
/* Success */
printf("PNG_ICC_CHECKSUM(0x%8.8lx, 0x%8.8lx,\n PNG_MD5("
"0x%2.2x%2.2x%2.2x%2.2x, 0x%2.2x%2.2x%2.2x%2.2x, 0x%2.2x%2.2x%2.2x%2.2x,"
" 0x%2.2x%2.2x%2.2x%2.2x), %d,\n"
" \"%4.4d/%2.2d/%2.2d %2.2d:%2.2d:%2.2d\", %lu, \"%s\")\n",
(unsigned long)a32, (unsigned long)c32,
header[84], header[85], header[86], header[87],
header[88], header[89], header[90], header[91],
header[92], header[93], header[94], header[95],
header[96], header[97], header[98], header[99],
# define u16(x) (header[x] * 256 + header[x+1])
# define u32(x) (u16(x) * 65536 + u16(x+2))
u32(64), u16(24), u16(26), u16(28), u16(30), u16(32), u16(34),
(unsigned long)length, name);
return 1;
}
int main(int argc, char **argv)
{
int err = 0;
printf("/* adler32, crc32, MD5[16], intent, date, length, file-name */\n");
if (argc > 1)
{
int i;
for (i=1; i<argc; ++i)
{
FILE *ip = fopen(argv[i], "rb");
if (ip == NULL || !read_one_file(ip, argv[i]))
{
err = 1;
perror(argv[i]);
fprintf(stderr, "%s: read error\n", argv[i]);
printf("/* ERROR: %s */\n", argv[i]);
}
(void)fclose(ip);
}
}
else
{
if (!read_one_file(stdin, "-"))
{
err = 1;
perror("stdin");
fprintf(stderr, "stdin: read error\n");
printf("/* ERROR: stdin */\n");
}
}
return err;
}
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