1 /* 2 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package com.sun.imageio.plugins.tiff; 26 27 import java.io.IOException; 28 import java.util.zip.DataFormatException; 29 import java.util.zip.Inflater; 30 import javax.imageio.IIOException; 31 import javax.imageio.plugins.tiff.BaselineTIFFTagSet; 32 33 public class TIFFDeflateDecompressor extends TIFFDecompressor { 34 35 Inflater inflater = null; 36 int predictor; 37 38 public TIFFDeflateDecompressor(int predictor) throws IIOException { 39 inflater = new Inflater(); 40 41 if (predictor != BaselineTIFFTagSet.PREDICTOR_NONE && 42 predictor != 43 BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) { 44 throw new IIOException("Illegal value for Predictor in " + 45 "TIFF file"); 46 } 47 48 this.predictor = predictor; 49 } 50 51 public synchronized void decodeRaw(byte[] b, 52 int dstOffset, 53 int bitsPerPixel, 54 int scanlineStride) throws IOException { 55 56 // Check bitsPerSample. 57 if (predictor == 58 BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) { 59 int len = bitsPerSample.length; 60 for(int i = 0; i < len; i++) { 61 if(bitsPerSample[i] != 8) { 62 throw new IIOException 63 (bitsPerSample[i] + "-bit samples "+ 64 "are not supported for Horizontal "+ 65 "differencing Predictor"); 66 } 67 } 68 } 69 70 // Seek to current tile data offset. 71 stream.seek(offset); 72 73 // Read the deflated data. 74 byte[] srcData = new byte[byteCount]; 75 stream.readFully(srcData); 76 77 int bytesPerRow = (srcWidth*bitsPerPixel + 7)/8; 78 byte[] buf; 79 int bufOffset; 80 if(bytesPerRow == scanlineStride) { 81 buf = b; 82 bufOffset = dstOffset; 83 } else { 84 buf = new byte[bytesPerRow*srcHeight]; 85 bufOffset = 0; 86 } 87 88 // Set the input to the Inflater. 89 inflater.setInput(srcData); 90 91 // Inflate the data. 92 try { 93 inflater.inflate(buf, bufOffset, bytesPerRow*srcHeight); 94 } catch(DataFormatException dfe) { 95 throw new IIOException("Error inflating data", 96 dfe); 97 } 98 99 // Reset the Inflater. 100 inflater.reset(); 101 102 if (predictor == 103 BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) { 104 int step = planar || samplesPerPixel == 1 ? 1 : samplesPerPixel; 105 int samplesPerRow = step * srcWidth; 106 107 int off = bufOffset + step; 108 for (int j = 0; j < srcHeight; j++) { 109 int count = off; 110 for (int i = step; i < samplesPerRow; i++) { 111 buf[count] += buf[count - step]; 112 count++; 113 } 114 off += samplesPerRow; 115 } 116 } 117 118 if(bytesPerRow != scanlineStride) { 119 int off = 0; 120 for (int y = 0; y < srcHeight; y++) { 121 System.arraycopy(buf, off, b, dstOffset, bytesPerRow); 122 off += bytesPerRow; 123 dstOffset += scanlineStride; 124 } 125 } 126 } 127 }