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annotate toys/posix/cksum.c @ 943:8cb7d65a40e8

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here's a version of paste. It doesn't deal with wide characters yet and likely behaves very badly when given too many files or delimiters.
author Felix Janda <felix.janda@posteo.de>
date Wed, 03 Jul 2013 02:29:24 -0500
parents 6cc69be43c42
children 22739b6d5a0e
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1 /* cksum.c - produce crc32 checksum value for each input
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2 *
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3 * Copyright 2008 Rob Landley <rob@landley.net>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/cksum.html
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6
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7 USE_CKSUM(NEWTOY(cksum, "IPLN", TOYFLAG_BIN))
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8
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9 config CKSUM
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10 bool "cksum"
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11 default y
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12 help
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13 usage: cksum [-IPLN] [file...]
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15 For each file, output crc32 checksum value, length and name of file.
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16 If no files listed, copy from stdin. Filename "-" is a synonym for stdin.
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18 -L Little endian (defaults to big endian)
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19 -P Pre-inversion
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20 -I Skip post-inversion
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21 -N Do not include length in CRC calculation
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22 */
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23
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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24 #define FOR_cksum
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25 #include "toys.h"
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27 GLOBALS(
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28 unsigned crc_table[256];
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29 )
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31 static unsigned cksum_be(unsigned crc, unsigned char c)
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32 {
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33 return (crc<<8)^TT.crc_table[(crc>>24)^c];
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34 }
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36 static unsigned cksum_le(unsigned crc, unsigned char c)
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37 {
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38 return TT.crc_table[(crc^c)&0xff] ^ (crc>>8);
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39 }
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40
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41 static void do_cksum(int fd, char *name)
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42 {
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43 unsigned crc = (toys.optflags&4) ? 0xffffffff : 0;
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44 uint64_t llen = 0, llen2;
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45 unsigned (*cksum)(unsigned crc, unsigned char c);
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47 cksum = (toys.optflags&2) ? cksum_le : cksum_be;
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48 // CRC the data
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50 for (;;) {
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51 int len, i;
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53 len = read(fd, toybuf, sizeof(toybuf));
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54 if (len<0) perror_msg("%s", name);
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55 if (len<1) break;
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57 llen += len;
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58 for (i=0; i<len; i++) crc=cksum(crc, toybuf[i]);
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59 }
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61 // CRC the length
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63 llen2 = llen;
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64 if (!(toys.optflags&1)) {
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65 while (llen) {
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66 crc = cksum(crc, llen);
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67 llen >>= 8;
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68 }
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69 }
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71 printf("%u %"PRIu64, (toys.optflags&8) ? crc : ~crc, llen2);
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72 if (strcmp("-", name)) printf(" %s", name);
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73 xputc('\n');
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74 }
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76 void cksum_main(void)
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77 {
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78 crc_init(TT.crc_table, toys.optflags&2);
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79 loopfiles(toys.optargs, do_cksum);
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80 }