org.apache.trevni.BZip2Codec.java Source code

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Here is the source code for org.apache.trevni.BZip2Codec.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.trevni;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;

public class BZip2Codec extends Codec {

    private ByteArrayOutputStream outputBuffer;
    public static final int DEFAULT_BUFFER_SIZE = 64 * 1024;

    @Override
    ByteBuffer compress(ByteBuffer uncompressedData) throws IOException {
        ByteArrayOutputStream baos = getOutputBuffer(uncompressedData.remaining());
        BZip2CompressorOutputStream outputStream = new BZip2CompressorOutputStream(baos);

        try {
            outputStream.write(uncompressedData.array());
        } finally {
            outputStream.close();
        }

        ByteBuffer result = ByteBuffer.wrap(baos.toByteArray());
        return result;
    }

    @Override
    ByteBuffer decompress(ByteBuffer compressedData) throws IOException {
        ByteArrayInputStream bais = new ByteArrayInputStream(compressedData.array());
        BZip2CompressorInputStream inputStream = new BZip2CompressorInputStream(bais);
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];

            int readCount = -1;

            while ((readCount = inputStream.read(buffer, compressedData.position(), buffer.length)) > 0) {
                baos.write(buffer, 0, readCount);
            }

            ByteBuffer result = ByteBuffer.wrap(baos.toByteArray());
            return result;
        } finally {
            inputStream.close();
        }
    }

    private ByteArrayOutputStream getOutputBuffer(int suggestedLength) {
        if (null == outputBuffer)
            outputBuffer = new ByteArrayOutputStream(suggestedLength);
        outputBuffer.reset();
        return outputBuffer;
    }

}