()
return table
Generate a CRC-32 table.

        ZIP encryption uses the CRC32 one-byte primitive for scrambling some
        internal keys. We noticed that a direct implementation is faster than
        relying on binascii.crc32().
Generate a CRC-32 table.
Generate a CRC - 32 table .
def _GenerateCRCTable():
        """Generate a CRC-32 table.

        ZIP encryption uses the CRC32 one-byte primitive for scrambling some
        internal keys. We noticed that a direct implementation is faster than
        relying on binascii.crc32().
        """
        poly = 0xedb88320
        table = [0] * 256
        for i in range(256):
            crc = i
            for j in range(8):
                if crc & 1:
                    crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly
                else:
                    crc = ((crc >> 1) & 0x7FFFFFFF)
            table[i] = crc
        return table
def _GenerateCRCTable ( ) : poly = 0xedb88320 table = [ 0 ] * 256 for i in range ( 256 ) : crc = i for j in range ( 8 ) : if crc & 1 : crc = ( ( crc >> 1 ) & 0x7FFFFFFF ) ^ poly else : crc = ( ( crc >> 1 ) & 0x7FFFFFFF ) table [ i ] = crc return table