CompressionUtils.java

package org.opendedup.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.logging.Logger;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

//import org.h2.compress.LZFInputStream;
//import org.h2.compress.LZFOutputStream;

public class CompressionUtils {
	@SuppressWarnings("unused")
	private static Logger log = Logger.getLogger("sdfs");

	public static byte[] compressZLIB(byte[] input) throws IOException {
		// Create the compressor with highest level of compression
		Deflater compressor = new Deflater();
		compressor.setLevel(Deflater.BEST_SPEED);
		// Give the compressor the data to compress
		compressor.setInput(input);
		compressor.finish();
		// Create an expandable byte array to hold the compressed data.
		// You cannot use an array that's the same size as the orginal because
		// there is no guarantee that the compressed data will be smaller than
		// the uncompressed data.
		ByteArrayOutputStream bos = new ByteArrayOutputStream(input.length);
		// Compress the data
		byte[] buf = new byte[1024];
		while (!compressor.finished()) {
			int count = compressor.deflate(buf);
			bos.write(buf, 0, count);
		}
		bos.close();
		// Get the compressed data
		byte[] compressedData = bos.toByteArray();
		return compressedData;
	}

	public static byte[] decompressZLIB(byte[] input) throws IOException {
		Inflater decompressor = new Inflater();
		decompressor.setInput(input);
		// Create an expandable byte array to hold the decompressed data
		ByteArrayOutputStream bos = new ByteArrayOutputStream(input.length);

		// Decompress the data
		byte[] buf = new byte[1024];
		while (!decompressor.finished()) {
			try {
				int count = decompressor.inflate(buf);
				bos.write(buf, 0, count);
			} catch (DataFormatException e) {
				throw new IOException(e.toString());
			}
		}
		bos.close();

		// Get the decompressed data
		byte[] decompressedData = bos.toByteArray();
		return decompressedData;

	}

	
}