drivers/staging/vt6655/tcrc.c

   1 /*
   2  * Copyright (c) 2003 VIA Networking, Inc. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  *
  19  * File: tcrc.c
  20  *
  21  * Purpose: Implement functions to caculate CRC
  22  *
  23  * Author: Tevin Chen
  24  *
  25  * Date: May 21, 1996
  26  *
  27  * Functions:
  28  *      CRCdwCrc32 -
  29  *      CRCdwGetCrc32 -
  30  *      CRCdwGetCrc32Ex -
  31  *
  32  * Revision History:
  33  *
  34  */
  35
  36 #include "tcrc.h"
  37
  38 /*---------------------  Static Definitions -------------------------*/
  39
  40 /*---------------------  Static Classes  ----------------------------*/
  41
  42 /*---------------------  Static Variables  --------------------------*/
  43
  44 // 32-bit CRC table
  45 static const unsigned long s_adwCrc32Table[256] = {
  46     0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL,
  47     0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L,
  48     0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L,
  49     0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L,
  50     0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL,
  51     0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L,
  52     0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
  53     0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L,
  54     0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L,
  55     0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL,
  56     0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L,
  57     0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L,
  58     0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L,
  59     0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
  60     0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L,
  61     0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL,
  62     0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL,
  63     0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L,
  64     0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L,
  65     0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L,
  66     0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
  67     0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L,
  68     0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL,
  69     0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L,
  70     0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L,
  71     0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL,
  72     0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L,
  73     0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
  74     0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L,
  75     0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL,
  76     0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L,
  77     0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL,
  78     0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL,
  79     0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L,
  80     0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
  81     0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L,
  82     0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL,
  83     0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L,
  84     0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL,
  85     0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L,
  86     0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L,
  87     0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
  88     0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L,
  89     0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L,
  90     0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L,
  91     0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL,
  92     0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L,
  93     0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL,
  94     0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
  95     0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L,
  96     0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L,
  97     0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L,
  98     0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL,
  99     0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L,
 100     0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL,
 101     0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
 102     0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L,
 103     0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL,
 104     0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L,
 105     0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L,
 106     0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L,
 107     0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL,
 108     0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
 109     0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL
 110 };
 111
 112 /*---------------------  Static Functions  --------------------------*/
 113
 114 /*---------------------  Export Variables  --------------------------*/
 115
 116
 117
 118
 119 /*+
 120  *
 121  * Description:
 122  *    Generate a CRC-32 from the data stream
 123  *
 124  * Parameters:
 125  *  In:
 126  *      pbyData     - the data stream
 127  *      cbByte      - the length of the stream
 128  *      dwCrcSeed   - Seed for CRC32
 129  *  Out:
 130  *      none
 131  *
 132  * Return Value: CRC-32
 133  *
 134 -*/
 135 unsigned long CRCdwCrc32 (unsigned char *pbyData, unsigned int cbByte, unsigned long dwCrcSeed)
 136 {
 137     unsigned long dwCrc;
 138
 139     dwCrc = dwCrcSeed;
 140     while (cbByte--) {
 141         dwCrc = s_adwCrc32Table[(unsigned char)((dwCrc ^ (*pbyData)) & 0xFF)] ^ (dwCrc >> 8);
 142         pbyData++;
 143     }
 144
 145     return dwCrc;
 146 }
 147
 148
 149 /*+
 150  *
 151  * Description:
 152  * To test CRC generator, input 8 bytes packet
 153  *      -- 0xff 0xff 0xff 0xff 0x00 0x00 0x00 0x00
 154  * the generated CRC should be
 155  *      -- 0xff 0xff 0xff 0xff
 156  *
 157  * Parameters:
 158  *  In:
 159  *      pbyData     - the data stream
 160  *      cbByte      - the length of the stream
 161  *  Out:
 162  *      none
 163  *
 164  * Return Value: CRC-32
 165  *
 166 -*/
 167 unsigned long CRCdwGetCrc32 (unsigned char *pbyData, unsigned int cbByte)
 168 {
 169     return ~CRCdwCrc32(pbyData, cbByte, 0xFFFFFFFFL);
 170 }
 171
 172
 173 /*+
 174  *
 175  * Description:
 176  *
 177  * NOTE.... Because CRCdwGetCrc32Ex() is an iteration function,
 178  *          this means we will use the output of CRCdwGetCrc32Ex()
 179  *          to be a new argument to do next CRCdwGetCrc32Ex() calculation.
 180  *          Thus, the final result must be inverted to be the
 181  *          correct answer.
 182  *
 183  * Parameters:
 184  *  In:
 185  *      pbyData     - the data stream
 186  *      cbByte      - the length of the stream
 187  *  Out:
 188  *      none
 189  *
 190  * Return Value: CRC-32
 191  *
 192 -*/
 193 unsigned long CRCdwGetCrc32Ex(unsigned char *pbyData, unsigned int cbByte, unsigned long dwPreCRC)
 194 {
 195     return CRCdwCrc32(pbyData, cbByte, dwPreCRC);
 196 }
 197
 198