| 1 |
/*
|
1 |
/*
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| 2 |
* $Id: crc32.c,v 1.1.1.1 1996/02/18 21:38:12 ylo Exp $
|
2 |
* $Id: crc32.c,v 1.1.1.1 1996/02/18 21:38:12 ylo Exp $
|
| 3 |
* $Log: crc32.c,v $
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3 |
* $Log: crc32.c,v $
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| 4 |
* Revision 1.1.1.1 1996/02/18 21:38:12 ylo
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4 |
* Revision 1.1.1.1 1996/02/18 21:38:12 ylo
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| 5 |
* Imported ssh-1.2.13.
|
5 |
* Imported ssh-1.2.13.
|
| 6 |
*
|
6 |
*
|
| 7 |
* Revision 1.2 1995/07/13 01:21:34 ylo
|
7 |
* Revision 1.2 1995/07/13 01:21:34 ylo
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| 8 |
* Added cvs log.
|
8 |
* Added cvs log.
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| 9 |
*
|
9 |
*
|
| 10 |
* $Endlog$
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10 |
* $Endlog$
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| 11 |
*/
|
11 |
*/
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| 12 |
|
12 |
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| 13 |
/* The implementation here was originally done by Gary S. Brown. I have
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13 |
/* The implementation here was originally done by Gary S. Brown. I have
|
| 14 |
borrowed the tables directly, and made some minor changes to the
|
14 |
borrowed the tables directly, and made some minor changes to the
|
| 15 |
crc32-function (including changing the interface). */
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15 |
crc32-function (including changing the interface). */
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| 16 |
|
16 |
|
| 17 |
#include "crc32.h"
|
17 |
#include "crc32.h"
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| 18 |
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18 |
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| 19 |
/* ============================================================= */
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19 |
/* ============================================================= */
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| 20 |
/* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or */
|
20 |
/* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or */
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| 21 |
/* code or tables extracted from it, as desired without restriction. */
|
21 |
/* code or tables extracted from it, as desired without restriction. */
|
| 22 |
/* */
|
22 |
/* */
|
| 23 |
/* First, the polynomial itself and its table of feedback terms. The */
|
23 |
/* First, the polynomial itself and its table of feedback terms. The */
|
| 24 |
/* polynomial is */
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24 |
/* polynomial is */
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| 25 |
/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
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25 |
/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
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| 26 |
/* */
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26 |
/* */
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| 27 |
/* Note that we take it "backwards" and put the highest-order term in */
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27 |
/* Note that we take it "backwards" and put the highest-order term in */
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| 28 |
/* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
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28 |
/* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
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| 29 |
/* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
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29 |
/* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
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| 30 |
/* the MSB being 1. */
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30 |
/* the MSB being 1. */
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| 31 |
/* */
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31 |
/* */
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| 32 |
/* Note that the usual hardware shift register implementation, which */
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32 |
/* Note that the usual hardware shift register implementation, which */
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| 33 |
/* is what we're using (we're merely optimizing it by doing eight-bit */
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33 |
/* is what we're using (we're merely optimizing it by doing eight-bit */
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| 34 |
/* chunks at a time) shifts bits into the lowest-order term. In our */
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34 |
/* chunks at a time) shifts bits into the lowest-order term. In our */
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| 35 |
/* implementation, that means shifting towards the right. Why do we */
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35 |
/* implementation, that means shifting towards the right. Why do we */
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| 36 |
/* do it this way? Because the calculated CRC must be transmitted in */
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36 |
/* do it this way? Because the calculated CRC must be transmitted in */
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| 37 |
/* order from highest-order term to lowest-order term. UARTs transmit */
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37 |
/* order from highest-order term to lowest-order term. UARTs transmit */
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| 38 |
/* characters in order from LSB to MSB. By storing the CRC this way, */
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38 |
/* characters in order from LSB to MSB. By storing the CRC this way, */
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| 39 |
/* we hand it to the UART in the order low-byte to high-byte; the UART */
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39 |
/* we hand it to the UART in the order low-byte to high-byte; the UART */
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| 40 |
/* sends each low-bit to hight-bit; and the result is transmission bit */
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/* sends each low-bit to hight-bit; and the result is transmission bit */
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| 41 |
/* by bit from highest- to lowest-order term without requiring any bit */
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41 |
/* by bit from highest- to lowest-order term without requiring any bit */
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| 42 |
/* shuffling on our part. Reception works similarly. */
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42 |
/* shuffling on our part. Reception works similarly. */
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| 43 |
/* */
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43 |
/* */
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| 44 |
/* The feedback terms table consists of 256, 32-bit entries. Notes: */
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44 |
/* The feedback terms table consists of 256, 32-bit entries. Notes: */
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| 45 |
/* */
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45 |
/* */
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| 46 |
/* The table can be generated at runtime if desired; code to do so */
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/* The table can be generated at runtime if desired; code to do so */
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| 47 |
/* is shown later. It might not be obvious, but the feedback */
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/* is shown later. It might not be obvious, but the feedback */
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| 48 |
/* terms simply represent the results of eight shift/xor opera- */
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48 |
/* terms simply represent the results of eight shift/xor opera- */
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| 49 |
/* tions for all combinations of data and CRC register values. */
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49 |
/* tions for all combinations of data and CRC register values. */
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| 50 |
/* */
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50 |
/* */
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| 51 |
/* The values must be right-shifted by eight bits by the "updcrc" */
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51 |
/* The values must be right-shifted by eight bits by the "updcrc" */
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| 52 |
/* logic; the shift must be unsigned (bring in zeroes). On some */
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52 |
/* logic; the shift must be unsigned (bring in zeroes). On some */
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| 53 |
/* hardware you could probably optimize the shift in assembler by */
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53 |
/* hardware you could probably optimize the shift in assembler by */
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| 54 |
/* using byte-swap instructions. */
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54 |
/* using byte-swap instructions. */
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| 55 |
/* polynomial $edb88320 */
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55 |
/* polynomial $edb88320 */
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| 56 |
/* */
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56 |
/* */
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| 57 |
/* -------------------------------------------------------------------- */
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57 |
/* -------------------------------------------------------------------- */
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| 58 |
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58 |
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| 59 |
const unsigned long crc32_tab[256] = {
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59 |
const unsigned long crc32_tab[256] = {
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| 60 |
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
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60 |
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
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| 61 |
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
|
61 |
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
|
| 62 |
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
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62 |
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
|
| 63 |
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
|
63 |
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
|
| 64 |
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
|
64 |
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
|
| 65 |
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
|
65 |
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
|
| 66 |
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
|
66 |
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
|
| 67 |
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
|
67 |
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
|
| 68 |
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
|
68 |
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
|
| 69 |
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
|
69 |
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
|
| 70 |
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
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70 |
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
|
| 71 |
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
|
71 |
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
|
| 72 |
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
|
72 |
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
|
| 73 |
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
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73 |
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
|
| 74 |
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
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74 |
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
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| 75 |
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
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75 |
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
|
| 76 |
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
|
76 |
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
|
| 77 |
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
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77 |
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
|
| 78 |
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
|
78 |
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
|
| 79 |
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
|
79 |
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
|
| 80 |
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
|
80 |
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
|
| 81 |
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
|
81 |
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
|
| 82 |
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
|
82 |
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
|
| 83 |
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
|
83 |
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
|
| 84 |
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
|
84 |
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
|
| 85 |
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
|
85 |
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
|
| 86 |
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
|
86 |
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
|
| 87 |
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
|
87 |
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
|
| 88 |
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
|
88 |
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
|
| 89 |
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
|
89 |
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
|
| 90 |
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
|
90 |
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
|
| 91 |
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
|
91 |
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
|
| 92 |
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
|
92 |
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
|
| 93 |
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
|
93 |
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
|
| 94 |
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
|
94 |
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
|
| 95 |
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
|
95 |
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
|
| 96 |
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
|
96 |
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
|
| 97 |
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
|
97 |
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
|
| 98 |
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
|
98 |
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
|
| 99 |
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
|
99 |
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
|
| 100 |
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
|
100 |
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
|
| 101 |
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
|
101 |
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
|
| 102 |
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
|
102 |
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
|
| 103 |
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
|
103 |
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
|
| 104 |
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
|
104 |
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
|
| 105 |
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
|
105 |
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
|
| 106 |
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
|
106 |
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
|
| 107 |
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
|
107 |
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
|
| 108 |
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
|
108 |
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
|
| 109 |
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
|
109 |
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
|
| 110 |
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
|
110 |
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
|
| 111 |
0x2d02ef8dL
|
111 |
0x2d02ef8dL
|
| 112 |
};
|
112 |
};
|
| 113 |
|
113 |
|
| 114 |
/* Return a 32-bit CRC of the contents of the buffer. */
|
114 |
/* Return a 32-bit CRC of the contents of the buffer. */
|
| 115 |
|
115 |
|
| 116 |
|
116 |
|
| 117 |
unsigned long crc32_init(void) {
|
117 |
unsigned long crc32_init(void) {
|
| 118 |
return(0xFFFFFFFFlu);
|
118 |
return(0xFFFFFFFFlu);
|
| 119 |
}
|
119 |
}
|
| 120 |
|
120 |
|
| 121 |
void crc32_feed(unsigned long *crc32val, const unsigned char *s, unsigned int len) {
|
121 |
void crc32_feed(unsigned long *crc32val, const unsigned char *s, unsigned int len) {
|
| 122 |
unsigned long i;
|
122 |
unsigned long i;
|
| 123 |
for (i = 0; i < len; i++) *crc32val = crc32_tab[(*crc32val ^ s[i]) & 0xff] ^ (*crc32val >> 8);
|
123 |
for (i = 0; i < len; i++) *crc32val = crc32_tab[(*crc32val ^ s[i]) & 0xff] ^ (*crc32val >> 8);
|
| 124 |
}
|
124 |
}
|
| 125 |
|
125 |
|
| 126 |
void crc32_finish(unsigned long *crc32val) {
|
126 |
void crc32_finish(unsigned long *crc32val) {
|
| 127 |
*crc32val ^= 0xFFFFFFFFlu;
|
127 |
*crc32val ^= 0xFFFFFFFFlu;
|
| 128 |
}
|
128 |
}
|
| 129 |
|
129 |
|