package org.simantics.lz4;

import java.io.UnsupportedEncodingException;

import net.jpountz.lz4.LZ4Compressor;
import net.jpountz.lz4.LZ4Factory;
import net.jpountz.lz4.LZ4FastDecompressor;
import net.jpountz.lz4.LZ4SafeDecompressor;

public class Main {

	public static void main(String[] args) throws UnsupportedEncodingException {
		LZ4Factory factory = LZ4Factory.fastestInstance();

		byte[] data = "12345345234572".getBytes("UTF-8");
		final int decompressedLength = data.length;

		// compress data
		LZ4Compressor compressor = factory.fastCompressor();
		int maxCompressedLength = compressor.maxCompressedLength(decompressedLength);
		byte[] compressed = new byte[maxCompressedLength];
		int compressedLength = compressor.compress(data, 0, decompressedLength, compressed, 0, maxCompressedLength);

		// decompress data
		// - method 1: when the decompressed length is known
		LZ4FastDecompressor decompressor = factory.fastDecompressor();
		byte[] restored = new byte[decompressedLength];
		int compressedLength2 = decompressor.decompress(compressed, 0, restored, 0, decompressedLength);
		System.out.println(compressedLength == compressedLength2);

		// - method 2: when the compressed length is known (a little slower)
		// the destination buffer needs to be over-sized
		LZ4SafeDecompressor decompressor2 = factory.safeDecompressor();
		int decompressedLength2 = decompressor2.decompress(compressed, 0, compressedLength, restored, 0);
		System.out.println(decompressedLength == decompressedLength2);
	}

}