release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/vt6656/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 DWORD 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 DWORD CRCdwCrc32(PBYTE pbyData, unsigned int cbByte, DWORD dwCrcSeed)
 136 {
 137         DWORD dwCrc;
 138
 139         dwCrc = dwCrcSeed;
 140         while (cbByte--) {
 141                 dwCrc = s_adwCrc32Table[(BYTE)((dwCrc ^ (*pbyData)) & 0xFF)] ^
 142                         (dwCrc >> 8);
 143                 pbyData++;
 144         }
 145
 146         return dwCrc;
 147 }
 148
 149
 150 /*+
 151  *
 152  * Description:
 153  * To test CRC generator, input 8 bytes packet
 154  *      -- 0xff 0xff 0xff 0xff 0x00 0x00 0x00 0x00
 155  * the generated CRC should be
 156  *      -- 0xff 0xff 0xff 0xff
 157  *
 158  * Parameters:
 159  *  In:
 160  *      pbyData     - the data stream
 161  *      cbByte      - the length of the stream
 162  *  Out:
 163  *      none
 164  *
 165  * Return Value: CRC-32
 166  *
 167 -*/
 168 DWORD CRCdwGetCrc32(PBYTE pbyData, unsigned int cbByte)
 169 {
 170     return ~CRCdwCrc32(pbyData, cbByte, 0xFFFFFFFFL);
 171 }
 172
 173
 174 /*+
 175  *
 176  * Description:
 177  *
 178  * NOTE.... Because CRCdwGetCrc32Ex() is an iteration function,
 179  *          this means we will use the output of CRCdwGetCrc32Ex()
 180  *          to be a new argument to do next CRCdwGetCrc32Ex() calculation.
 181  *          Thus, the final result must be inverted to be the
 182  *          correct answer.
 183  *
 184  * Parameters:
 185  *  In:
 186  *      pbyData     - the data stream
 187  *      cbByte      - the length of the stream
 188  *  Out:
 189  *      none
 190  *
 191  * Return Value: CRC-32
 192  *
 193 -*/
 194 DWORD CRCdwGetCrc32Ex(PBYTE pbyData, unsigned int cbByte, DWORD dwPreCRC)
 195 {
 196     return CRCdwCrc32(pbyData, cbByte, dwPreCRC);
 197 }