一个CRC翻译为JavaScript版本

Question

public static UInt32 cal_crc(byte[] bdata, int len)
{

        UInt32 dwPolynomial = 0x04c11db7;
        UInt32 xbit;
        UInt32 data;
        UInt32 CRC = 0xFFFFFFFF;    // init
        int i = 0;
        while (len-- > 0)
        {
            xbit = (UInt32)1 << 31;

            data = bdata[i]; i++;
            for (int bits = 0; bits < 32; bits++)
            {
                if ((CRC & 0x80000000) > 0)
                {
                    CRC <<= 1;
                    CRC ^= dwPolynomial;
                }
                else
                    CRC <<= 1;
                if ((data & xbit) > 0)
                    CRC ^= dwPolynomial;

                xbit >>= 1;
            }
        }
        return CRC;
    }
}

Answer 1

http://download.csdn.net/detail/yb4141/9403298
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