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102 lines
2.4 KiB
102 lines
2.4 KiB
/* 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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