source: trunk/package/rbcfg/src/cyg_crc32.c @ 27315

Last change on this file since 27315 was 27315, checked in by juhosg, 5 years ago

package/rbcfg: new tool for modifying boot configuration on the RB4xx boards

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1//==========================================================================
2//
3//      crc32.c
4//
5//      Gary S. Brown's 32 bit CRC
6//
7//==========================================================================
8//####ECOSGPLCOPYRIGHTBEGIN####
9// -------------------------------------------
10// This file is part of eCos, the Embedded Configurable Operating System.
11// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12// Copyright (C) 2002 Gary Thomas
13//
14// eCos is free software; you can redistribute it and/or modify it under
15// the terms of the GNU General Public License as published by the Free
16// Software Foundation; either version 2 or (at your option) any later version.
17//
18// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
19// WARRANTY; without even the implied warranty of MERCHANTABILITY or
20// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
21// for more details.
22//
23// You should have received a copy of the GNU General Public License along
24// with eCos; if not, write to the Free Software Foundation, Inc.,
25// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26//
27// As a special exception, if other files instantiate templates or use macros
28// or inline functions from this file, or you compile this file and link it
29// with other works to produce a work based on this file, this file does not
30// by itself cause the resulting work to be covered by the GNU General Public
31// License. However the source code for this file must still be made available
32// in accordance with section (3) of the GNU General Public License.
33//
34// This exception does not invalidate any other reasons why a work based on
35// this file might be covered by the GNU General Public License.
36//
37// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
38// at http://sources.redhat.com/ecos/ecos-license/
39// -------------------------------------------
40//####ECOSGPLCOPYRIGHTEND####
41//==========================================================================
42//#####DESCRIPTIONBEGIN####
43//
44// Author(s):    gthomas
45// Contributors: gthomas,asl
46// Date:         2001-01-31
47// Purpose:     
48// Description: 
49//             
50// This code is part of eCos (tm).
51//
52//####DESCRIPTIONEND####
53//
54//==========================================================================
55
56#if 0
57#include <cyg/crc/crc.h>
58#else
59#include "cyg_crc.h"
60#endif
61
62  /* ====================================================================== */
63  /*  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or       */
64  /*  code or tables extracted from it, as desired without restriction.     */
65  /*                                                                        */
66  /*  First, the polynomial itself and its table of feedback terms.  The    */
67  /*  polynomial is                                                         */
68  /*  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   */
69  /*                                                                        */
70  /* ====================================================================== */
71
72static const cyg_uint32 crc32_tab[] = {
73      0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
74      0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
75      0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
76      0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
77      0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
78      0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
79      0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
80      0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
81      0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
82      0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
83      0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
84      0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
85      0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
86      0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
87      0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
88      0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
89      0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
90      0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
91      0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
92      0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
93      0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
94      0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
95      0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
96      0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
97      0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
98      0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
99      0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
100      0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
101      0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
102      0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
103      0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
104      0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
105      0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
106      0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
107      0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
108      0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
109      0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
110      0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
111      0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
112      0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
113      0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
114      0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
115      0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
116      0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
117      0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
118      0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
119      0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
120      0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
121      0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
122      0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
123      0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
124      0x2d02ef8dL
125   };
126
127/* This is the standard Gary S. Brown's 32 bit CRC algorithm, but
128   accumulate the CRC into the result of a previous CRC. */
129cyg_uint32
130cyg_crc32_accumulate(cyg_uint32 crc32val, unsigned char *s, int len)
131{
132  int i;
133
134  for (i = 0;  i < len;  i++) {
135    crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8);
136  }
137  return crc32val;
138}
139
140/* This is the standard Gary S. Brown's 32 bit CRC algorithm */
141cyg_uint32
142cyg_crc32(unsigned char *s, int len)
143{
144  return (cyg_crc32_accumulate(0,s,len));
145}
146
147/* Return a 32-bit CRC of the contents of the buffer accumulating the
148   result from a previous CRC calculation. This uses the Ethernet FCS
149   algorithm.*/
150cyg_uint32
151cyg_ether_crc32_accumulate(cyg_uint32 crc32val, unsigned char *s, int len)
152{
153  int i;
154
155  if (s == 0) return 0L;
156 
157  crc32val = crc32val ^ 0xffffffff;
158  for (i = 0;  i < len;  i++) {
159      crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8);
160  }
161  return crc32val ^ 0xffffffff;
162}
163
164/* Return a 32-bit CRC of the contents of the buffer, using the
165   Ethernet FCS algorithm. */
166cyg_uint32
167cyg_ether_crc32(unsigned char *s, int len)
168{
169  return cyg_ether_crc32_accumulate(0,s,len);
170}
171
172
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