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Data types needed for service abstraction, used by both server and client components.

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package com.fasterxml.clustermate.std;

import com.fasterxml.storemate.shared.hash.HashConstants;
import com.fasterxml.storemate.shared.hash.IncrementalHasher32;
import com.fasterxml.storemate.shared.hash.IncrementalMurmur3Hasher;

public class ChecksumUtil
{
    public static int calcChecksum(byte[] data) {
        return calcChecksum(data, 0, data.length);
    }

    public static IncrementalHasher32 startChecksum() {
      return new IncrementalMurmur3Hasher();
    }

    public static IncrementalHasher32 startChecksum(byte[] data, int offset, int len) {
        IncrementalHasher32 hasher = startChecksum();
        hasher.update(data, offset, len);
        return hasher;
    }

    public static int calcChecksum(byte[] data, int offset, int len) {
        return cleanChecksum(startChecksum(data, offset, len).calculateHash());
    }

    public static int getChecksum32(IncrementalHasher32 hasher) {
      return cleanChecksum(hasher.calculateHash());
    }

    public static int cleanChecksum(int raw) {
        return (raw == HashConstants.NO_CHECKSUM) ? HashConstants.CHECKSUM_FOR_ZERO : raw;
    }
}