| /* |
| * Copyright (c) 2005, 2017, 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.io.ByteArrayInputStream; |
| import java.util.Iterator; |
| import javax.imageio.ImageIO; |
| import javax.imageio.ImageReader; |
| import javax.imageio.ImageReadParam; |
| import javax.imageio.stream.MemoryCacheImageInputStream; |
| import javax.imageio.stream.ImageInputStream; |
| import javax.imageio.plugins.tiff.BaselineTIFFTagSet; |
| import javax.imageio.plugins.tiff.TIFFField; |
| |
| public class TIFFJPEGDecompressor extends TIFFDecompressor { |
| // Start of Image |
| protected static final int SOI = 0xD8; |
| |
| // End of Image |
| protected static final int EOI = 0xD9; |
| |
| protected ImageReader JPEGReader = null; |
| protected ImageReadParam JPEGParam; |
| |
| protected boolean hasJPEGTables = false; |
| protected byte[] tables = null; |
| |
| private byte[] data = new byte[0]; |
| |
| public TIFFJPEGDecompressor() {} |
| |
| public void beginDecoding() { |
| // Initialize the JPEG reader if needed. |
| if(this.JPEGReader == null) { |
| // Get all JPEG readers. |
| Iterator<ImageReader> iter = ImageIO.getImageReadersByFormatName("jpeg"); |
| |
| if(!iter.hasNext()) { |
| throw new IllegalStateException("No JPEG readers found!"); |
| } |
| |
| // Initialize reader to the first one. |
| this.JPEGReader = iter.next(); |
| |
| this.JPEGParam = JPEGReader.getDefaultReadParam(); |
| } |
| |
| // Get the JPEGTables field. |
| TIFFImageMetadata tmetadata = (TIFFImageMetadata)metadata; |
| TIFFField f = |
| tmetadata.getTIFFField(BaselineTIFFTagSet.TAG_JPEG_TABLES); |
| |
| if (f != null) { |
| this.hasJPEGTables = true; |
| this.tables = f.getAsBytes(); |
| } else { |
| this.hasJPEGTables = false; |
| } |
| } |
| |
| public void decodeRaw(byte[] b, |
| int dstOffset, |
| int bitsPerPixel, |
| int scanlineStride) throws IOException { |
| // Seek to the data position for this segment. |
| stream.seek(offset); |
| |
| // Set the stream variable depending on presence of JPEGTables. |
| ImageInputStream is; |
| if(this.hasJPEGTables) { |
| // The current strip or tile is an abbreviated JPEG stream. |
| |
| // Reallocate memory if there is not enough already. |
| int dataLength = tables.length + byteCount; |
| if(data.length < dataLength) { |
| data = new byte[dataLength]; |
| } |
| |
| // Copy the tables ignoring any EOI and subsequent bytes. |
| int dataOffset = tables.length; |
| for(int i = tables.length - 2; i > 0; i--) { |
| if((tables[i] & 0xff) == 0xff && |
| (tables[i+1] & 0xff) == EOI) { |
| dataOffset = i; |
| break; |
| } |
| } |
| System.arraycopy(tables, 0, data, 0, dataOffset); |
| |
| // Check for SOI and skip it if present. |
| byte byte1 = (byte)stream.read(); |
| byte byte2 = (byte)stream.read(); |
| if(!((byte1 & 0xff) == 0xff && (byte2 & 0xff) == SOI)) { |
| data[dataOffset++] = byte1; |
| data[dataOffset++] = byte2; |
| } |
| |
| // Read remaining data. |
| stream.readFully(data, dataOffset, byteCount - 2); |
| |
| // Create ImageInputStream. |
| ByteArrayInputStream bais = new ByteArrayInputStream(data); |
| is = new MemoryCacheImageInputStream(bais); |
| } else { |
| // The current strip or tile is a complete JPEG stream. |
| is = stream; |
| } |
| |
| // Set the stream on the reader. |
| JPEGReader.setInput(is, false, true); |
| |
| // Set the destination to the raw image ignoring the parameters. |
| JPEGParam.setDestination(rawImage); |
| |
| // Read the strip or tile. |
| JPEGReader.read(0, JPEGParam); |
| } |
| |
| @SuppressWarnings("deprecation") |
| protected void finalize() throws Throwable { |
| super.finalize(); |
| JPEGReader.dispose(); |
| } |
| } |