001    /*
002     * Copyright (c) Andrey Kuznetsov. All Rights Reserved.
003     *
004     * http://uio.imagero.com
005     *
006     * Redistribution and use in source and binary forms, with or without
007     * modification, are permitted provided that the following conditions are met:
008     *
009     *  o Redistributions of source code must retain the above copyright notice,
010     *    this list of conditions and the following disclaimer.
011     *
012     *  o Redistributions in binary form must reproduce the above copyright notice,
013     *    this list of conditions and the following disclaimer in the documentation
014     *    and/or other materials provided with the distribution.
015     *
016     *  o Neither the name of Andrey Kuznetsov nor the names of
017     *    its contributors may be used to endorse or promote products derived
018     *    from this software without specific prior written permission.
019     *
020     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
021     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
022     * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
023     * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
024     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
025     * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
026     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
027     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
028     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
029     * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
030     * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
031     */
032    
033    package com.imagero.uio.io;
034    import java.io.IOException;
035    import java.io.InputStream;
036    
037    /**
038     * @author Andrey Kuznetsov
039     */
040    public class TargaRLEInputStream extends RLEInputStream {
041    
042        int numSamples;
043        byte [] value;
044        boolean rawPacket;
045        int pixelSize;
046        int vindex;
047    
048        public TargaRLEInputStream(InputStream in, int pixelSize) {
049            super(in);
050            this.pixelSize = pixelSize;
051            value = new byte[pixelSize];
052        }
053    
054        public int read() throws IOException {
055            if (numSamples == 0) {
056                int v = in.read();
057                if(v == -1) {
058                    return -1;
059                }
060                if ((v >> 7) == 1) {
061                    for (int i = 0; i < value.length; i++) {
062                        value[i] = (byte) in.read();
063                    }
064                    numSamples = ((v & 0x7F) + 1) * pixelSize;
065                    rawPacket = false;
066                }
067                else {
068                    numSamples = (v + 1) * pixelSize;
069                    rawPacket = true;
070                }
071            }
072            numSamples--;
073            if (rawPacket) {
074                return in.read();
075            }
076            else {
077                int b = value[vindex++] & 0xFF;
078                if(vindex == pixelSize) {
079                    vindex = 0;
080                }
081                return b;
082            }
083        }
084    }