com.twelvemonkeys.imageio.plugins.pict.QTBMPDecompressor Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.imageio.plugins.pict;

import com.twelvemonkeys.io.FastByteArrayOutputStream;
import com.twelvemonkeys.io.LittleEndianDataOutputStream;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;

/**
 * QTBMPDecompressor
 *
 * @author Harald Kuhr
 * @author last modified by $Author: haraldk$
 * @version $Id: QTBMPDecompressor.java,v 1.0 Feb 16, 2009 9:18:28 PM haraldk Exp$
 */
final class QTBMPDecompressor extends QTDecompressor {
    public boolean canDecompress(final QuickTime.ImageDesc pDescription) {
        return QuickTime.VENDOR_APPLE.equals(pDescription.compressorVendor) && "WRLE".equals(pDescription.compressorIdentifer)
                && "bmp ".equals(idString(pDescription.extraDesc, 4));
    }

    private static String idString(final byte[] pData, final int pOffset) {
        try {
            return new String(pData, pOffset, 4, "ASCII");
        }
        catch (UnsupportedEncodingException e) {
            throw new Error("ASCII charset must always be supported", e);
        }
    }

    public BufferedImage decompress(final QuickTime.ImageDesc pDescription, final InputStream pStream) throws IOException {
        return ImageIO.read(new SequenceInputStream(fakeBMPHeader(pDescription), pStream));
    }

    private InputStream fakeBMPHeader(final QuickTime.ImageDesc pDescription) throws IOException {
        int bmpHeaderSize = 14;
        int dibHeaderSize = 12; // 12: OS/2 V1
        ByteArrayOutputStream out = new FastByteArrayOutputStream(bmpHeaderSize + dibHeaderSize);

        LittleEndianDataOutputStream stream = new LittleEndianDataOutputStream(out);

        // BMP header
        stream.writeByte('B');
        stream.writeByte('M');

        stream.writeInt(pDescription.dataSize + bmpHeaderSize + dibHeaderSize); // Data size + BMP header + DIB header

        stream.writeShort(0x0); // Reserved
        stream.writeShort(0x0); // Reserved

        stream.writeInt(bmpHeaderSize + dibHeaderSize); // Image offset

        // DIB header
        stream.writeInt(dibHeaderSize);      // DIB header size

        stream.writeShort(pDescription.width);
        stream.writeShort(pDescription.height);

        stream.writeShort(1); // Planes, only legal value: 1
        stream.writeShort(pDescription.depth); // Bit depth

        return new ByteArrayInputStream(out.toByteArray());
    }
}