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 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 /* 32-bit CRC table */
  39 static const u32 s_adwCrc32Table[256] = {
  40     0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL,
  41     0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L,
  42     0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L,
  43     0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L,
  44     0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL,
  45     0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L,
  46     0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
  47     0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L,
  48     0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L,
  49     0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL,
  50     0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L,
  51     0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L,
  52     0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L,
  53     0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
  54     0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L,
  55     0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL,
  56     0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL,
  57     0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L,
  58     0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L,
  59     0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L,
  60     0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
  61     0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L,
  62     0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL,
  63     0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L,
  64     0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L,
  65     0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL,
  66     0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L,
  67     0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
  68     0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L,
  69     0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL,
  70     0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L,
  71     0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL,
  72     0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL,
  73     0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L,
  74     0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
  75     0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L,
  76     0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL,
  77     0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L,
  78     0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL,
  79     0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L,
  80     0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L,
  81     0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
  82     0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L,
  83     0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L,
  84     0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L,
  85     0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL,
  86     0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L,
  87     0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL,
  88     0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
  89     0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L,
  90     0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L,
  91     0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L,
  92     0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL,
  93     0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L,
  94     0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL,
  95     0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
  96     0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L,
  97     0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL,
  98     0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L,
  99     0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L,
 100     0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L,
 101     0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL,
 102     0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
 103     0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL
 104 };
 105
 106 /*+
 107  *
 108  * Description:
 109  *    Generate a CRC-32 from the data stream
 110  *
 111  * Parameters:
 112  *  In:
 113  *      pbyData     - the data stream
 114  *      cbByte      - the length of the stream
 115  *      dwCrcSeed   - Seed for CRC32
 116  *  Out:
 117  *      none
 118  *
 119  * Return Value: CRC-32
 120  *
 121 -*/
 122 u32 CRCdwCrc32(u8 * pbyData, unsigned int cbByte, u32 dwCrcSeed)
 123 {
 124         u32 dwCrc;
 125
 126         dwCrc = dwCrcSeed;
 127         while (cbByte--) {
 128                 dwCrc = s_adwCrc32Table[(u8)((dwCrc ^ (*pbyData)) & 0xFF)] ^
 129                         (dwCrc >> 8);
 130                 pbyData++;
 131         }
 132
 133         return dwCrc;
 134 }
 135
 136 /*+
 137  *
 138  * Description:
 139  * To test CRC generator, input 8 bytes packet
 140  *      -- 0xff 0xff 0xff 0xff 0x00 0x00 0x00 0x00
 141  * the generated CRC should be
 142  *      -- 0xff 0xff 0xff 0xff
 143  *
 144  * Parameters:
 145  *  In:
 146  *      pbyData     - the data stream
 147  *      cbByte      - the length of the stream
 148  *  Out:
 149  *      none
 150  *
 151  * Return Value: CRC-32
 152  *
 153 -*/
 154 u32 CRCdwGetCrc32(u8 * pbyData, unsigned int cbByte)
 155 {
 156     return ~CRCdwCrc32(pbyData, cbByte, 0xFFFFFFFFL);
 157 }
 158
 159 /*+
 160  *
 161  * Description:
 162  *
 163  * NOTE.... Because CRCdwGetCrc32Ex() is an iteration function,
 164  *          this means we will use the output of CRCdwGetCrc32Ex()
 165  *          to be a new argument to do next CRCdwGetCrc32Ex() calculation.
 166  *          Thus, the final result must be inverted to be the
 167  *          correct answer.
 168  *
 169  * Parameters:
 170  *  In:
 171  *      pbyData     - the data stream
 172  *      cbByte      - the length of the stream
 173  *  Out:
 174  *      none
 175  *
 176  * Return Value: CRC-32
 177  *
 178 -*/
 179 u32 CRCdwGetCrc32Ex(u8 * pbyData, unsigned int cbByte, u32 dwPreCRC)
 180 {
 181     return CRCdwCrc32(pbyData, cbByte, dwPreCRC);
 182 }
 183