crc32

/* crc32(unsigned long, unsigned char const*, unsigned int) */

uint crc32(ulong param_1,uchar *param_2,uint param_3)

{
  uint uVar1;
  byte *pbVar2;
  byte *pbVar3;
  uint uVar4;
  
  if (param_2 != (uchar *)0x0) {
    uVar1 = ~param_1;
    if (7 < param_3) {
      uVar4 = param_3 - 8 >> 3;
      pbVar2 = param_2;
      do {
        pbVar3 = pbVar2 + 8;
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ *pbVar2) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[1]) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[2]) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[3]) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[4]) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[5]) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[6]) * 4);
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ pbVar2[7]) * 4);
        pbVar2 = pbVar3;
      } while (pbVar3 != param_2 + uVar4 * 8 + 8);
      param_3 = param_3 & 7;
      param_2 = param_2 + uVar4 * 8 + 8;
    }
    if (param_3 != 0) {
      pbVar2 = param_2;
      do {
        pbVar3 = pbVar2 + 1;
        uVar1 = uVar1 >> 8 ^ *(uint *)(crc_table + (uint)(byte)((byte)uVar1 ^ *pbVar2) * 4);
        pbVar2 = pbVar3;
      } while (pbVar3 != param_2 + param_3);
    }
    return ~uVar1;
  }
  return 0;
}