crc32.h

/* crc32 -- calculate and POSIX.2 checksum 
   Copyright (C) 92, 1995-1999 Free Software Foundation, Inc.

   This program 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, or (at your option)
   any later version.

   This program 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 this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef CRC32_H
#define CRC32_H

static const unsigned long crctab[256];

static inline unsigned long crc32(const void* const buffer,
		                  unsigned long     length,
		                  unsigned long     crc)
{
      const unsigned char* cp = (const unsigned char*)buffer;

      while (length--)
        crc = (crc << 8) ^ crctab[((crc >> 24) ^ *(cp++)) & 0xFF];

      return crc;
}

#endif