1/* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17/** 18 * @author Rustem Rafikov 19 * @version $Revision: 1.2 $ 20 */ 21package org.apache.harmony.x.imageio.plugins.jpeg; 22 23import javax.imageio.stream.ImageInputStream; 24 25import org.apache.harmony.awt.gl.image.DecodingImageSource; 26 27import java.io.InputStream; 28import java.io.IOException; 29 30/** 31 * This allows usage of the java2d jpegdecoder with ImageInputStream in 32 * the JPEGImageReader. Temporary, only to make JPEGImageReader#read(..) 33 * working. 34 * 35 */ 36public class IISDecodingImageSource extends DecodingImageSource { 37 38 private final InputStream is; 39 40 public IISDecodingImageSource(ImageInputStream iis) { 41 is = new IISToInputStreamWrapper(iis); 42 } 43 44 @Override 45 protected boolean checkConnection() { 46 return true; 47 } 48 49 @Override 50 protected InputStream getInputStream() { 51 return is; 52 } 53 54 static class IISToInputStreamWrapper extends InputStream { 55 56 private ImageInputStream input; 57 58 public IISToInputStreamWrapper(ImageInputStream input) { 59 this.input=input; 60 } 61 62 @Override 63 public int read() throws IOException { 64 return input.read(); 65 } 66 67 @Override 68 public int read(byte[] b) throws IOException { 69 return input.read(b); 70 } 71 72 @Override 73 public int read(byte[] b, int off, int len) throws IOException { 74 return input.read(b, off, len); 75 } 76 77 @Override 78 public long skip(long n) throws IOException { 79 return input.skipBytes(n); 80 } 81 82 @Override 83 public boolean markSupported() { 84 return true; // This is orig 85 86 // ???AWT: FIXME 87 // This is an error in Harmony. Not all input streams 88 // have mark support and it is not ok to just return true. 89 // There should be an input.markSupported(). However, if 90 // this call returns false, nothing works anymore. 91 92 // The backside is that BitmapFactory uses a call to markSupport() 93 // to find out if it needs to warp the stream in a 94 // BufferedInputStream to get mark support, and this fails! 95 96 // Currently, the hack is in BitmapFactory, where we always 97 // wrap the stream in a BufferedInputStream. 98 } 99 100 @Override 101 public void mark(int readlimit) { 102 input.mark(); 103 } 104 105 @Override 106 public void reset() throws IOException { 107 input.reset(); 108 } 109 110 @Override 111 public void close() throws IOException { 112 input.close(); 113 } 114 } 115} 116