| /* |
| * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.imageio.plugins.tiff; |
| |
| import java.io.IOException; |
| import java.util.zip.DataFormatException; |
| import java.util.zip.Inflater; |
| import javax.imageio.IIOException; |
| import javax.imageio.plugins.tiff.BaselineTIFFTagSet; |
| |
| public class TIFFDeflateDecompressor extends TIFFDecompressor { |
| |
| Inflater inflater = null; |
| int predictor; |
| |
| public TIFFDeflateDecompressor(int predictor) throws IIOException { |
| inflater = new Inflater(); |
| |
| if (predictor != BaselineTIFFTagSet.PREDICTOR_NONE && |
| predictor != |
| BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) { |
| throw new IIOException("Illegal value for Predictor in " + |
| "TIFF file"); |
| } |
| |
| this.predictor = predictor; |
| } |
| |
| public synchronized void decodeRaw(byte[] b, |
| int dstOffset, |
| int bitsPerPixel, |
| int scanlineStride) throws IOException { |
| |
| // Check bitsPerSample. |
| if (predictor == |
| BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) { |
| int len = bitsPerSample.length; |
| for(int i = 0; i < len; i++) { |
| if(bitsPerSample[i] != 8) { |
| throw new IIOException |
| (bitsPerSample[i] + "-bit samples "+ |
| "are not supported for Horizontal "+ |
| "differencing Predictor"); |
| } |
| } |
| } |
| |
| // Seek to current tile data offset. |
| stream.seek(offset); |
| |
| // Read the deflated data. |
| byte[] srcData = new byte[byteCount]; |
| stream.readFully(srcData); |
| |
| int bytesPerRow = (srcWidth*bitsPerPixel + 7)/8; |
| byte[] buf; |
| int bufOffset; |
| if(bytesPerRow == scanlineStride) { |
| buf = b; |
| bufOffset = dstOffset; |
| } else { |
| buf = new byte[bytesPerRow*srcHeight]; |
| bufOffset = 0; |
| } |
| |
| // Set the input to the Inflater. |
| inflater.setInput(srcData); |
| |
| // Inflate the data. |
| try { |
| inflater.inflate(buf, bufOffset, bytesPerRow*srcHeight); |
| } catch(DataFormatException dfe) { |
| throw new IIOException("Error inflating data", |
| dfe); |
| } |
| |
| // Reset the Inflater. |
| inflater.reset(); |
| |
| if (predictor == |
| BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) { |
| int step = planar || samplesPerPixel == 1 ? 1 : samplesPerPixel; |
| int samplesPerRow = step * srcWidth; |
| |
| int off = bufOffset + step; |
| for (int j = 0; j < srcHeight; j++) { |
| int count = off; |
| for (int i = step; i < samplesPerRow; i++) { |
| buf[count] += buf[count - step]; |
| count++; |
| } |
| off += samplesPerRow; |
| } |
| } |
| |
| if(bytesPerRow != scanlineStride) { |
| int off = 0; |
| for (int y = 0; y < srcHeight; y++) { |
| System.arraycopy(buf, off, b, dstOffset, bytesPerRow); |
| off += bytesPerRow; |
| dstOffset += scanlineStride; |
| } |
| } |
| } |
| } |