Last change
on this file since 1236 was 821, checked in by Bruno Cornec, 18 years ago |
Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
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File size:
1.2 KB
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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * cksum - calculate the CRC32 checksum of a file
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4 | *
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5 | * Copyright (C) 2006 by Rob Sullivan, with ideas from code by Walter Harms
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */
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8 |
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9 | #include <stdio.h>
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10 | #include <unistd.h>
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11 | #include <fcntl.h>
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12 | #include "busybox.h"
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13 |
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14 | int cksum_main(int argc, char **argv) {
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15 |
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16 | uint32_t *crc32_table = bb_crc32_filltable(1);
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17 |
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18 | FILE *fp;
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19 | uint32_t crc;
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20 | long length, filesize;
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21 | int bytes_read;
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22 | char *cp;
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23 | RESERVE_CONFIG_BUFFER(buf, BUFSIZ);
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24 | int inp_stdin = (argc == optind) ? 1 : 0;
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25 |
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26 | do {
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27 | fp = bb_wfopen_input((inp_stdin) ? bb_msg_standard_input : *++argv);
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28 |
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29 | crc = 0;
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30 | length = 0;
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31 |
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32 | while ((bytes_read = fread(buf, 1, BUFSIZ, fp)) > 0) {
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33 | cp = buf;
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34 | length += bytes_read;
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35 | while (bytes_read--)
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36 | crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ (*cp++)) & 0xffL];
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37 | }
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38 |
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39 | filesize = length;
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40 |
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41 | for (; length; length >>= 8)
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42 | crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ length) & 0xffL];
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43 | crc ^= 0xffffffffL;
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44 |
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45 | if (inp_stdin) {
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46 | printf("%"PRIu32" %li\n", crc, filesize);
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47 | break;
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48 | }
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49 |
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50 | printf("%"PRIu32" %li %s\n", crc, filesize, *argv);
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51 | fclose(fp);
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52 | } while (*(argv+1));
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53 |
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54 | return EXIT_SUCCESS;
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55 | }
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