Last change
on this file since 1522 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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Rev | Line | |
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[821] | 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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