darwin.jopenctm.io.PackedInputStream Maven / Gradle / Ivy

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/*
 * Copyright (C) 2012 Daniel Heinrich
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * (version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see  
 * or write to the Free Software Foundation, Inc., 51 Franklin Street,
 * Fifth Floor, Boston, MA 02110-1301  USA.
 */
package darwin.jopenctm.io;

import java.io.*;

import lzma.sdk.lzma.Decoder;
import org.cservenak.streams.*;

/**
 *
 * @author daniel
 */
public final class PackedInputStream extends CoderInputStream {

    protected PackedInputStream(byte[] packedData) throws IOException {
        super(new ByteArrayInputStream(packedData), new CustomWrapper(packedData.length));
    }

    private static class CustomWrapper implements Coder {

        private final Decoder d;
        private final int len;

        public CustomWrapper(int packedLength) {
            d = new Decoder();
            len = packedLength;
        }

        @Override
        public void code(final InputStream in, final OutputStream out)
                throws IOException {

            byte[] properties = new byte[5];
            if (in.read(properties) != 5) {
                throw new IOException("LZMA file has no header!");
            }

            if (!d.setDecoderProperties(properties)) {
                throw new IOException("Decoder properties cannot be set!");
            }

            if (!d.code(in, out, len)) {
                throw new IOException("Decoding unsuccessful!");
            }
        }
    }
}