org.dellroad.lzma.client.LZMAByteArrayCompressor Maven / Gradle / Ivy

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gwt-lzma is a GWT module that implements the Lempel-Ziv-Markov chain (LZMA) compression algorithm. This is a generic compression library, i.e., compression in Javascript, not just compression of Javascript (i.e., "minification").

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/*
 * Copyright (C) 2009 Archie L. Cobbs. All rights reserved.
 *
 * $Id$
 */

package org.dellroad.lzma.client;

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

/**
 * LZMA compressor for {@code byte[]} arrays.
 */
public class LZMAByteArrayCompressor extends LZMACompressor {

    private final ByteArrayOutputStream output;

    /**
     * Construct an encoder using the {@link #DEFAULT_COMPRESSION_MODE default compression mode}.
     *
     * 
     * This is a convenience constructor, equivalent to:
     * 

     * LZMACompressor(data, DEFAULT_COMPRESSION_MODE)
     * 
     */
    public LZMAByteArrayCompressor(byte[] data) {
        this(data, DEFAULT_COMPRESSION_MODE);
    }

    /**
     * Primary constructor.
     *
     * @param data uncompressed data
     * @param mode compression mode
     * @throws IllegalArgumentException if {@code mode} is null
     */
    public LZMAByteArrayCompressor(byte[] data, CompressionMode mode) {
        this.output = new ByteArrayOutputStream();
        try {
            init(new ByteArrayInputStream(data), this.output, data.length, mode);
        } catch (IOException e) {
            throw new RuntimeException("impossible exception");
        }
    }

    /**
     * Get the compressed data.
     */
    public byte[] getCompressedData() {
        return this.output.toByteArray();
    }
}