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