hashCodeAscii() — netty Function Reference

Source Code

common/src/main/java/io/netty/util/internal/PlatformDependent0.java lines 1022–1048

    static int hashCodeAscii(byte[] bytes, int startPos, int length) {
        int hash = HASH_CODE_ASCII_SEED;
        long baseOffset = BYTE_ARRAY_BASE_OFFSET + startPos;
        final int remainingBytes = length & 7;
        final long end = baseOffset + remainingBytes;
        for (long i = baseOffset - 8 + length; i >= end; i -= 8) {
            hash = hashCodeAsciiCompute(UNSAFE.getLong(bytes, i), hash);
        }
        if (remainingBytes == 0) {
            return hash;
        }
        int hcConst = HASH_CODE_C1;
        if (remainingBytes != 2 & remainingBytes != 4 & remainingBytes != 6) { // 1, 3, 5, 7
            hash = hash * HASH_CODE_C1 + hashCodeAsciiSanitize(UNSAFE.getByte(bytes, baseOffset));
            hcConst = HASH_CODE_C2;
            baseOffset++;
        }
        if (remainingBytes != 1 & remainingBytes != 4 & remainingBytes != 5) { // 2, 3, 6, 7
            hash = hash * hcConst + hashCodeAsciiSanitize(UNSAFE.getShort(bytes, baseOffset));
            hcConst = hcConst == HASH_CODE_C1 ? HASH_CODE_C2 : HASH_CODE_C1;
            baseOffset += 2;
        }
        if (remainingBytes >= 4) { // 4, 5, 6, 7
            return hash * hcConst + hashCodeAsciiSanitize(UNSAFE.getInt(bytes, baseOffset));
        }
        return hash;
    }