package com.ximple.eofms.util;
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//~--- JDK imports ------------------------------------------------------------
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.zip.DataFormatException;
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import java.util.zip.Deflater;
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import java.util.zip.Inflater;
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/**
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* ByteArrayCompressor
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* User: Ulysses
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* Date: 2007/6/15
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* Time: 下午 02:21:00
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* To change this template use File | Settings | File Templates.
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*/
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public final class ByteArrayCompressor
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{
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public static byte[] decompressByteArray(byte[] raw)
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{
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// Create the decompressor and give it the data to compress
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Inflater decompressor = new Inflater();
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decompressor.setInput(raw);
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// Create an expandable byte array to hold the decompressed data
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ByteArrayOutputStream bos = new ByteArrayOutputStream(raw.length);
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// Decompress the data
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byte[] buf = new byte[1024];
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while (!decompressor.finished())
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{
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try
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{
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int count = decompressor.inflate(buf);
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bos.write(buf, 0, count);
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} catch (DataFormatException e)
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{
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}
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}
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try
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{
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bos.close();
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} catch (IOException e)
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{
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}
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// Get the decompressed data
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byte[] decompressedData = bos.toByteArray();
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return decompressedData;
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}
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public static byte[] compressByteArray(byte[] raw)
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{
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// Create the compressor with highest level of compression
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Deflater compressor = new Deflater();
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compressor.setLevel(Deflater.BEST_SPEED);
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// Give the compressor the data to compress
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compressor.setInput(raw);
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compressor.finish();
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// Create an expandable byte array to hold the compressed data.
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// You cannot use an array that's the same size as the orginal because
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// there is no guarantee that the compressed data will be smaller than
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// the uncompressed data.
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ByteArrayOutputStream bos = new ByteArrayOutputStream(raw.length);
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// Compress the data
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byte[] buf = new byte[1024];
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while (!compressor.finished())
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{
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int count = compressor.deflate(buf);
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bos.write(buf, 0, count);
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}
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try
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{
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bos.close();
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} catch (IOException e)
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{
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}
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// Get the compressed data
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byte[] compressedData = bos.toByteArray();
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return compressedData;
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}
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}
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