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