001/*
002 * $RCSfile: IISRandomAccessIO.java,v $
003 *
004 * 
005 * Copyright (c) 2006 Sun Microsystems, Inc. All  Rights Reserved.
006 * 
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions
009 * are met: 
010 * 
011 * - Redistribution of source code must retain the above copyright 
012 *   notice, this  list of conditions and the following disclaimer.
013 * 
014 * - Redistribution in binary form must reproduce the above copyright
015 *   notice, this list of conditions and the following disclaimer in 
016 *   the documentation and/or other materials provided with the
017 *   distribution.
018 * 
019 * Neither the name of Sun Microsystems, Inc. or the names of 
020 * contributors may be used to endorse or promote products derived 
021 * from this software without specific prior written permission.
022 * 
023 * This software is provided "AS IS," without a warranty of any 
024 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
025 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
026 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
028 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
029 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
031 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035 * POSSIBILITY OF SUCH DAMAGES. 
036 * 
037 * You acknowledge that this software is not designed or intended for 
038 * use in the design, construction, operation or maintenance of any 
039 * nuclear facility. 
040 *
041 * $Revision: 1.1 $
042 * $Date: 2006/08/08 00:31:47 $
043 * $State: Exp $
044 */
045package com.sun.media.imageioimpl.plugins.jpeg2000;
046
047import java.io.IOException;
048import java.nio.ByteOrder;
049import javax.imageio.stream.ImageInputStream;
050import jj2000.j2k.io.EndianType;
051import jj2000.j2k.io.RandomAccessIO;
052
053/**
054 * A wrapper for converting an <code>ImageInputStream</code> into a
055 * <code>RandomAccessIO</code>. The resulting class is read-only.
056 */
057public class IISRandomAccessIO implements RandomAccessIO {
058
059    /** The <code>ImageInputStream</code> that is wrapped */
060    private ImageInputStream iis;
061
062    /**
063     * Creates a <code>RandomAccessIO</code> instance from the supplied
064     * <code>ImageInputStream</code>.
065     *
066     * @param iis The source <code>ImageInputStream</code>.
067     */
068    public IISRandomAccessIO(ImageInputStream iis) {
069        if (iis == null) {
070            throw new IllegalArgumentException("iis == null!");
071        }
072        this.iis = iis;
073    }
074
075    public void close() throws IOException {
076        iis.close();
077    }
078
079    /**
080     * Returns the stream position clamped to a maximum of
081     * <code>Integer.MAX_VALUE</code>.
082     */
083    public int getPos() throws IOException {
084        long pos = iis.getStreamPosition();
085        return pos > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int)pos;
086    }
087
088    public void seek(int off) throws IOException {
089        iis.seek(off);
090    }
091
092    /**
093     * Returns the length of the data stream.
094     *
095     * <p>If the length of the <code>ImageInputStream</code> is not
096     * <code>-1</code>, then it is returned after being clamped to
097     * a maximum value of <code>Integer.MAX_VALUE</code>. If the
098     * <code>ImageInputStream</code> is <code>-1</code>, the stream
099     * is read to a maximum position of <code>Integer.MAX_VALUE</code>
100     * and its final position is returned. The position of the stream
101     * is unchanged from the value it had prior to the call.</p>
102     */
103    public int length() throws IOException {
104        long len = iis.length();
105
106        // If the length is non-negative, use it.
107        if(len != -1L) {
108            return len > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int)len;
109        }
110
111        // If the length is negative, read until the stream ends.
112        iis.mark();
113        int bufLen = 1024;
114        byte[] buf = new byte[bufLen];
115        long pos = iis.getStreamPosition();
116        while(pos < Integer.MAX_VALUE) {
117            int numRead = iis.read(buf, 0, bufLen);
118            if(numRead == -1) break; // EOF
119            pos += numRead;
120        }
121        iis.reset();
122
123        // Return the last position.
124        return pos > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int)pos;
125    }
126
127    public int read() throws IOException {
128        return iis.read();
129    }
130
131    public void readFully(byte b[], int off, int n) throws IOException {
132        iis.readFully(b, off, n);
133    }
134
135    public int getByteOrdering() {
136        return iis.getByteOrder() == ByteOrder.BIG_ENDIAN ?
137            EndianType.BIG_ENDIAN : EndianType.LITTLE_ENDIAN;
138    }
139
140    public byte readByte() throws IOException {
141        return iis.readByte();
142    }
143
144    public int readUnsignedByte() throws IOException {
145        return iis.readUnsignedByte();
146    }
147
148    public short readShort() throws IOException {
149        return iis.readShort();
150    }
151
152    public int readUnsignedShort() throws IOException {
153        return iis.readUnsignedShort();
154    }
155
156    public int readInt() throws IOException {
157        return iis.readInt();
158    }
159
160    public long readUnsignedInt() throws IOException {
161        return iis.readUnsignedInt();
162    }
163
164    public long readLong() throws IOException {
165        return iis.readLong();
166    }
167
168    public float readFloat() throws IOException {
169        return iis.readFloat();
170    }
171
172    public double readDouble() throws IOException {
173        return iis.readDouble();
174    }
175
176    public int skipBytes(int n) throws IOException {
177        return iis.skipBytes(n);
178    }
179
180    /**
181     * A null operation as writing is not supported.
182     */
183    public void flush() {
184        // Intentionally empty.
185    }
186
187    /**
188     * Throws an <code>IOException</code> as writing is not supported.
189     */
190    public void write(int b) throws IOException {
191        throw new IOException("Writing is not supported!");
192    }
193
194    /**
195     * Throws an <code>IOException</code> as writing is not supported.
196     */
197    public void writeByte(int v) throws IOException {
198        throw new IOException("Writing is not supported!");
199    }
200
201    /**
202     * Throws an <code>IOException</code> as writing is not supported.
203     */
204    public void writeShort(int v) throws IOException {
205        throw new IOException("Writing is not supported!");
206    }
207
208    /**
209     * Throws an <code>IOException</code> as writing is not supported.
210     */
211    public void writeInt(int v) throws IOException {
212        throw new IOException("Writing is not supported!");
213    }
214
215    /**
216     * Throws an <code>IOException</code> as writing is not supported.
217     */
218    public void writeLong(long v) throws IOException {
219        throw new IOException("Writing is not supported!");
220    }
221
222    /**
223     * Throws an <code>IOException</code> as writing is not supported.
224     */
225    public void writeFloat(float v) throws IOException {
226        throw new IOException("Writing is not supported!");
227    }
228
229    /**
230     * Throws an <code>IOException</code> as writing is not supported.
231     */
232    public void writeDouble(double v) throws IOException {
233        throw new IOException("Writing is not supported!");
234    }
235}