Contents of /trunk/mkinitrd-magellan/busybox/coreutils/cksum.c
Parent Directory | Revision Log
Revision 532 -
(show annotations)
(download)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 1165 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 1165 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * cksum - calculate the CRC32 checksum of a file |
4 | * |
5 | * Copyright (C) 2006 by Rob Sullivan, with ideas from code by Walter Harms |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ |
8 | |
9 | #include "busybox.h" |
10 | |
11 | int cksum_main(int argc, char **argv) |
12 | { |
13 | |
14 | uint32_t *crc32_table = crc32_filltable(1); |
15 | |
16 | FILE *fp; |
17 | uint32_t crc; |
18 | long length, filesize; |
19 | int bytes_read; |
20 | char *cp; |
21 | |
22 | int inp_stdin = (argc == optind) ? 1 : 0; |
23 | |
24 | do { |
25 | fp = fopen_or_warn_stdin((inp_stdin) ? bb_msg_standard_input : *++argv); |
26 | |
27 | crc = 0; |
28 | length = 0; |
29 | |
30 | while ((bytes_read = fread(bb_common_bufsiz1, 1, BUFSIZ, fp)) > 0) { |
31 | cp = bb_common_bufsiz1; |
32 | length += bytes_read; |
33 | while (bytes_read--) |
34 | crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ (*cp++)) & 0xffL]; |
35 | } |
36 | |
37 | filesize = length; |
38 | |
39 | for (; length; length >>= 8) |
40 | crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ length) & 0xffL]; |
41 | crc ^= 0xffffffffL; |
42 | |
43 | if (inp_stdin) { |
44 | printf("%" PRIu32 " %li\n", crc, filesize); |
45 | break; |
46 | } |
47 | |
48 | printf("%" PRIu32 " %li %s\n", crc, filesize, *argv); |
49 | fclose(fp); |
50 | } while (*(argv + 1)); |
51 | |
52 | fflush_stdout_and_exit(EXIT_SUCCESS); |
53 | } |