sal/rtl/crc.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/types.h>
  21 #include <rtl/crc.h>
  22
  23 /*========================================================================
  24  *
  25  * rtl_crc32Table (CRC polynomial 0xEDB88320).
  26  *
  27  *======================================================================*/
  28 static const sal_uInt32 rtl_crc32Table[256] =
  29 {
  30     /* 0 */
  31     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
  32     0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
  33     0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  34     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
  35
  36     /* 1 */
  37     0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
  38     0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  39     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
  40     0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
  41
  42     /* 2 */
  43     0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  44     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
  45     0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
  46     0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  47
  48     /* 3 */
  49     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
  50     0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
  51     0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  52     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
  53
  54     /* 4 */
  55     0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
  56     0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  57     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
  58     0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
  59
  60     /* 5 */
  61     0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  62     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
  63     0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
  64     0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  65
  66     /* 6 */
  67     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
  68     0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
  69     0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  70     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
  71
  72     /* 7 */
  73     0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
  74     0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  75     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
  76     0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
  77
  78     /* 8 */
  79     0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  80     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
  81     0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
  82     0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  83
  84     /* 9 */
  85     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
  86     0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
  87     0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  88     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
  89
  90     /* A */
  91     0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
  92     0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  93     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
  94     0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
  95
  96     /* B */
  97     0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  98     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
  99     0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
 100     0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
 101
 102     /* C */
 103     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
 104     0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
 105     0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
 106     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
 107
 108     /* D */
 109     0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
 110     0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
 111     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
 112     0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
 113
 114     /* E */
 115     0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
 116     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
 117     0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
 118     0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
 119
 120     /* F */
 121     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
 122     0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
 123     0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
 124     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
 125 };
 126
 127 /*========================================================================
 128  *
 129  * rtl_crc32 implementation.
 130  *
 131  *======================================================================*/
 132 #define UPDCRC32(crc, octet) \
 133     (rtl_crc32Table[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
 134
 135 /*
 136  * rtl_crc32.
 137  */
 138 sal_uInt32 SAL_CALL rtl_crc32 (
 139     sal_uInt32  Crc,
 140     const void *Data, sal_uInt32 DatLen) SAL_THROW_EXTERN_C()
 141 {
 142     if (Data)
 143     {
 144         const sal_uInt8 *p = (const sal_uInt8 *)Data;
 145         const sal_uInt8 *q = p + DatLen;
 146
 147         Crc = ~Crc;
 148         while (p < q)
 149             Crc = UPDCRC32(Crc, *(p++));
 150         Crc = ~Crc;
 151     }
 152     return Crc;
 153 }
 154
 155 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */