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 calculate 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  * Description:
 119  *    Generate a CRC-32 from the data stream
 120  *
 121  * Parameters:
 122  *  In:
 123  *      pbyData     - the data stream
 124  *      cbByte      - the length of the stream
 125  *      dwCrcSeed   - Seed for CRC32
 126  *  Out:
 127  *      none
 128  *
 129  * Return Value: CRC-32
 130  *
 131  -*/
 132 unsigned long CRCdwCrc32(unsigned char *pbyData, unsigned int cbByte, unsigned long dwCrcSeed)
 133 {
 134         unsigned long dwCrc;
 135
 136         dwCrc = dwCrcSeed;
 137         while (cbByte--) {
 138                 dwCrc = s_adwCrc32Table[(unsigned char)((dwCrc ^ (*pbyData)) & 0xFF)] ^ (dwCrc >> 8);
 139                 pbyData++;
 140         }
 141
 142         return dwCrc;
 143 }
 144
 145 /*+
 146  *
 147  * Description:
 148  * To test CRC generator, input 8 bytes packet
 149  *      -- 0xff 0xff 0xff 0xff 0x00 0x00 0x00 0x00
 150  * the generated CRC should be
 151  *      -- 0xff 0xff 0xff 0xff
 152  *
 153  * Parameters:
 154  *  In:
 155  *      pbyData     - the data stream
 156  *      cbByte      - the length of the stream
 157  *  Out:
 158  *      none
 159  *
 160  * Return Value: CRC-32
 161  *
 162  -*/
 163 unsigned long CRCdwGetCrc32(unsigned char *pbyData, unsigned int cbByte)
 164 {
 165         return ~CRCdwCrc32(pbyData, cbByte, 0xFFFFFFFFL);
 166 }
 167
 168 /*+
 169  *
 170  * Description:
 171  *
 172  * NOTE.... Because CRCdwGetCrc32Ex() is an iteration function,
 173  *          this means we will use the output of CRCdwGetCrc32Ex()
 174  *          to be a new argument to do next CRCdwGetCrc32Ex() calculation.
 175  *          Thus, the final result must be inverted to be the
 176  *          correct answer.
 177  *
 178  * Parameters:
 179  *  In:
 180  *      pbyData     - the data stream
 181  *      cbByte      - the length of the stream
 182  *  Out:
 183  *      none
 184  *
 185  * Return Value: CRC-32
 186  *
 187  -*/
 188 unsigned long CRCdwGetCrc32Ex(unsigned char *pbyData, unsigned int cbByte, unsigned long dwPreCRC)
 189 {
 190         return CRCdwCrc32(pbyData, cbByte, dwPreCRC);
 191 }