/* lzo_crc.c -- crc checksum for the the LZO library

   This file is part of the LZO real-time data compression library.

   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer

   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer

   All Rights Reserved.

   The LZO library is free software; you can redistribute it and/or

   modify it under the terms of the GNU General Public License as

   published by the Free Software Foundation; either version 2 of

   the License, or (at your option) any later version.

   The LZO library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with the LZO library; see the file COPYING.

   If not, write to the Free Software Foundation, Inc.,

   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

   Markus F.X.J. Oberhumer

   <markus@oberhumer.com></markus@oberhumer.com>

   http://www.oberhumer.com/opensource/lzo/

 */

#include "lzo_conf.h"

/***********************************************************************

// crc32 checksum

// adapted from free code by Mark Adler <madler@alumni.caltech.edu></madler@alumni.caltech.edu>

// see http://www.zlib.org/

************************************************************************/

static const lzo_uint32 lzo_crc32_table[256] = {

  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,

  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,

  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,

  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,

  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,

  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,

  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,

  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,

  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,

  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,

  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,

  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,

  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,

  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,

  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,

  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,

  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,

  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,

  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,

  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,

  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,

  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,

  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,

  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,

  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,

  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,

  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,

  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,

  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,

  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,

  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,

  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,

  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,

  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,

  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,

  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,

  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,

  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,

  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,

  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,

  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,

  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,

  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,

  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,

  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,

  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,

  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,

  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,

  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,

  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,

  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,

  0x2d02ef8dL

};

LZO_PUBLIC(const lzo_uint32p)

lzo_get_crc32_table(void)

{

    return lzo_crc32_table;

}

#if 1

#define LZO_DO1(buf,i) \

    crc = table[((int)crc ^ buf[i]) & 0xff] ^ (crc >> 8)

#else

#define LZO_DO1(buf,i) \

    crc = table[(unsigned char)((unsigned char)crc ^ buf[i])] ^ (crc >> 8)

#endif

#define LZO_DO2(buf,i)  LZO_DO1(buf,i); LZO_DO1(buf,i+1);

#define LZO_DO4(buf,i)  LZO_DO2(buf,i); LZO_DO2(buf,i+2);

#define LZO_DO8(buf,i)  LZO_DO4(buf,i); LZO_DO4(buf,i+4);

#define LZO_DO16(buf,i) LZO_DO8(buf,i); LZO_DO8(buf,i+8);

LZO_PUBLIC(lzo_uint32)

lzo_crc32(lzo_uint32 c, const lzo_bytep buf, lzo_uint len)

{

    lzo_uint32 crc;

#undef table

#if 1

#  define table lzo_crc32_table

#else

   const lzo_uint32 * table = lzo_crc32_table;

#endif

    if (buf == NULL)

        return 0;

    crc = (c & LZO_UINT32_C(0xffffffff)) ^ LZO_UINT32_C(0xffffffff);

    if (len >= 16) do

    {

        LZO_DO16(buf,0);

        buf += 16;

        len -= 16;

    } while (len >= 16);

    if (len != 0) do

    {

        LZO_DO1(buf,0);

        buf += 1;

        len -= 1;

    } while (len > 0);

    return crc ^ LZO_UINT32_C(0xffffffff);

#undef table

}

#undef LZO_DO1

#undef LZO_DO2

#undef LZO_DO4

#undef LZO_DO8

#undef LZO_DO16

/*

vi:ts=4:et

*/