com.twelvemonkeys.imageio.plugins.sgi.RLEDecoder Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of imageio-sgi Show documentation
ImageIO plugin for Silicon Graphics Image Format (SGI)
There is a newer version: 3.12.0
/*
 * Copyright (c) 2014, 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.sgi;

import com.twelvemonkeys.io.enc.Decoder;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

final class RLEDecoder implements Decoder {

    public int decode(final InputStream stream, final ByteBuffer buffer) throws IOException {
        // Adapted from c code sample in tgaffs.pdf
        while (buffer.remaining() >= 0x7f) {
            int val = stream.read();
            if (val < 0) {
                break; // EOF
            }

            int count = val & 0x7f;

            if (count == 0) {
                break; // No more data
            }

            if ((val & 0x80) != 0) {
                for (int i = 0; i < count; i++) {
                    int pixel = stream.read();
                    if (pixel < 0) {
                        break; // EOF
                    }

                    buffer.put((byte) pixel);
                }
            }
            else {
                int pixel = stream.read();
                if (pixel < 0) {
                    break; // EOF
                }

                for (int i = 0; i < count; i++) {
                    buffer.put((byte) pixel);
                }
            }
        }

        return buffer.position();
    }
}