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#include "crc32.h"

static const unsigned int crc32tab[16] = {
   0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190,
   0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344,
   0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278,
   0xbdbdf21c
};

unsigned int crc32(const void *data, unsigned int length)
{
   const unsigned char *buf = (const unsigned char *)data;
   unsigned int crc = 0xffffffff;
   unsigned int i;

   if (length == 0) return 0;

   for (i = 0; i < length; ++i)
   {
      crc ^= buf[i];
      crc = crc32tab[crc & 0x0f] ^ (crc >> 4);
      crc = crc32tab[crc & 0x0f] ^ (crc >> 4);
   }

   return crc ^ 0xffffffff;
}sa