public static void hash3_x64_128()

in harry-core/src/harry/util/TokenUtil.java [49:123]

• 49 lines of code
• 17 McCabe index (conditional complexity)

    public static void hash3_x64_128(ByteBuffer key, int offset, int length, long seed, long[] result)
    {
        final int nblocks = length >> 4; // Process as 128-bit blocks.

        long h1 = seed;
        long h2 = seed;

        long c1 = 0x87c37b91114253d5L;
        long c2 = 0x4cf5ad432745937fL;

        //----------
        // body

        for(int i = 0; i < nblocks; i++)
        {
            long k1 = getBlock(key, offset, i * 2 + 0);
            long k2 = getBlock(key, offset, i * 2 + 1);

            k1 *= c1; k1 = rotl64(k1,31); k1 *= c2; h1 ^= k1;

            h1 = rotl64(h1,27); h1 += h2; h1 = h1*5+0x52dce729;

            k2 *= c2; k2  = rotl64(k2,33); k2 *= c1; h2 ^= k2;

            h2 = rotl64(h2,31); h2 += h1; h2 = h2*5+0x38495ab5;
        }

        //----------
        // tail

        // Advance offset to the unprocessed tail of the data.
        offset += nblocks * 16;

        long k1 = 0;
        long k2 = 0;

        switch(length & 15)
        {
            case 15: k2 ^= ((long) key.get(offset+14)) << 48;
            case 14: k2 ^= ((long) key.get(offset+13)) << 40;
            case 13: k2 ^= ((long) key.get(offset+12)) << 32;
            case 12: k2 ^= ((long) key.get(offset+11)) << 24;
            case 11: k2 ^= ((long) key.get(offset+10)) << 16;
            case 10: k2 ^= ((long) key.get(offset+9)) << 8;
            case  9: k2 ^= ((long) key.get(offset+8)) << 0;
                k2 *= c2; k2  = rotl64(k2,33); k2 *= c1; h2 ^= k2;

            case  8: k1 ^= ((long) key.get(offset+7)) << 56;
            case  7: k1 ^= ((long) key.get(offset+6)) << 48;
            case  6: k1 ^= ((long) key.get(offset+5)) << 40;
            case  5: k1 ^= ((long) key.get(offset+4)) << 32;
            case  4: k1 ^= ((long) key.get(offset+3)) << 24;
            case  3: k1 ^= ((long) key.get(offset+2)) << 16;
            case  2: k1 ^= ((long) key.get(offset+1)) << 8;
            case  1: k1 ^= ((long) key.get(offset));
                k1 *= c1; k1  = rotl64(k1,31); k1 *= c2; h1 ^= k1;
        };

        //----------
        // finalization

        h1 ^= length; h2 ^= length;

        h1 += h2;
        h2 += h1;

        h1 = fmix(h1);
        h2 = fmix(h2);

        h1 += h2;
        h2 += h1;

        result[0] = h1;
        result[1] = h2;
    }