as_crc.cpp

changeset 1
d64aaa7d146f
child 3
c1941114ca88
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/as_crc.cpp	Fri Nov 28 11:21:08 2008 +0100
     1.3 @@ -0,0 +1,148 @@
     1.4 +//
     1.5 +//  OSSP asgui - Accounting system graphical user interface
     1.6 +//  Copyright (c) 2002-2004 The OSSP Project (http://www.ossp.org/)
     1.7 +//  Copyright (c) 2002-2004 Ralf S. Engelschall <rse@engelschall.com>
     1.8 +//  Copyright (c) 2002-2004 Michael Schloh von Bennewitz <michael@schloh.com>
     1.9 +//  Copyright (c) 2002-2004 Cable & Wireless Telecommunications Services GmbH
    1.10 +//
    1.11 +//  This file is part of OSSP asgui, an accounting system graphical user
    1.12 +//  interface which can be found at http://www.ossp.org/pkg/tool/asgui/.
    1.13 +//
    1.14 +//  Permission to use, copy, modify, and distribute this software for
    1.15 +//  any purpose with or without fee is hereby granted, provided that
    1.16 +//  the above copyright notice and this permission notice appear in all
    1.17 +//  copies.
    1.18 +//
    1.19 +//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    1.20 +//  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    1.21 +//  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    1.22 +//  IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
    1.23 +//  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    1.24 +//  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    1.25 +//  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    1.26 +//  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    1.27 +//  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    1.28 +//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    1.29 +//  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    1.30 +//  SUCH DAMAGE.
    1.31 +//
    1.32 +//  as_crc.cpp: ISO C++ implementation
    1.33 +//
    1.34 +
    1.35 +#include "as_crc.h"
    1.36 +
    1.37 +
    1.38 +//
    1.39 +// Calculate a CRC32 value, as devised by Mark ADLER
    1.40 +// Returns 0xffffffff on empty or zero length strings
    1.41 +//
    1.42 +U32 Qualistring::getCrc(void)
    1.43 +{
    1.44 +    U32 Hash = 0xffffffff;
    1.45 +    unsigned int unLen = 0;
    1.46 +    const char *pText = this->ascii();
    1.47 +
    1.48 +    unLen = this->length();
    1.49 +
    1.50 +    while (unLen-- > 0)
    1.51 +        Hash = m_pkHash[(Hash ^ *pText++) & 0xff] ^ (Hash >> 8);
    1.52 +
    1.53 +    Hash ^= 0xffffffff;
    1.54 +    return Hash;
    1.55 +}
    1.56 +
    1.57 +//
    1.58 +// Overloaded equals operator, use with regular QString objects
    1.59 +//
    1.60 +Qualistring &Qualistring::operator=(const QString &Convertin)
    1.61 +{
    1.62 +    this->setAscii((const char *)Convertin);    // This hack is a big loop
    1.63 +    return *this;                               // to move data inefficiently
    1.64 +}
    1.65 +
    1.66 +//
    1.67 +// Reflect the bits of Ref, just like a mirror
    1.68 +//
    1.69 +U32 Qualistring::mirrorBits(U32 Ref, U8 Bytes)
    1.70 +{
    1.71 +    U32 unMirror = 0;
    1.72 +
    1.73 +    // Swap bits starting at 1 and moving up to Bytes
    1.74 +    for(int nIter = 1; nIter < (Bytes + 1); nIter++) {
    1.75 +        if (Ref & 1)
    1.76 +            unMirror |= 1 << (Bytes - nIter);
    1.77 +        Ref >>= 1;
    1.78 +    }
    1.79 +    return unMirror;
    1.80 +}
    1.81 +
    1.82 +//
    1.83 +// Initialize the hash table for fast CRC32 value generation
    1.84 +//
    1.85 +void Qualistring::initCrc(void)
    1.86 +{
    1.87 +    const unsigned long unPolynomial = 0x04c11db7;
    1.88 +
    1.89 +    // Match 256 values representing the ASCII character codes
    1.90 +    for(int nOuter = 0; nOuter <= 0xFF; nOuter++) {
    1.91 +        m_pkHash[nOuter] = mirrorBits(nOuter, 8) << 24;
    1.92 +        for (int nInner = 0; nInner < 8; nInner++)
    1.93 +            m_pkHash[nOuter] = (m_pkHash[nOuter] << 1) ^ (m_pkHash[nOuter] & (1 << 31) ? unPolynomial : 0);
    1.94 +        m_pkHash[nOuter] = mirrorBits(m_pkHash[nOuter], 32);
    1.95 +    }
    1.96 +
    1.97 +/*    m_pkHash[256] = {
    1.98 +        0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
    1.99 +        0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
   1.100 +        0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
   1.101 +        0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
   1.102 +        0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
   1.103 +        0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
   1.104 +        0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
   1.105 +        0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
   1.106 +        0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
   1.107 +        0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
   1.108 +        0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
   1.109 +        0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
   1.110 +        0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
   1.111 +        0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
   1.112 +        0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
   1.113 +        0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
   1.114 +        0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
   1.115 +        0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
   1.116 +        0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
   1.117 +        0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
   1.118 +        0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
   1.119 +        0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
   1.120 +        0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
   1.121 +        0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
   1.122 +        0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
   1.123 +        0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
   1.124 +        0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
   1.125 +        0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
   1.126 +        0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
   1.127 +        0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
   1.128 +        0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
   1.129 +        0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
   1.130 +        0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
   1.131 +        0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
   1.132 +        0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
   1.133 +        0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
   1.134 +        0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
   1.135 +        0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
   1.136 +        0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
   1.137 +        0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
   1.138 +        0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
   1.139 +        0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
   1.140 +        0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
   1.141 +        0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
   1.142 +        0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
   1.143 +        0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
   1.144 +        0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
   1.145 +        0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
   1.146 +        0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
   1.147 +        0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
   1.148 +        0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
   1.149 +        0x2d02ef8dL
   1.150 +    };*/
   1.151 +}

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