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libsrc/avi/src/org/monte/media/io/ImageInputStreamAdapter.java

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+/*
+ * @(#)ImageInputStreamAdapter.java  1.0  2009-12-17
+ * 
+ * Copyright (c) 2009 Werner Randelshofer, Goldau, Switzerland.
+ * All rights reserved.
+ *
+ * You may not use, copy or modify this file, except in compliance with the
+ * license agreement you entered into with Werner Randelshofer.
+ * For details see accompanying license terms.
+ */
+
+package org.monte.media.io;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import javax.imageio.stream.ImageInputStream;
+
+/**
+ * ImageInputStreamAdapter.
+ *
+ * @author Werner Randelshofer
+ * @version 1.0 2009-12-17 Created.
+ */
+public class ImageInputStreamAdapter extends FilterInputStream {
+    private ImageInputStream iis;
+    public ImageInputStreamAdapter(ImageInputStream iis) {
+        super(null);
+        this.iis=iis;
+    }
+
+    /**
+     * Reads the next byte of data from this input stream. The value
+     * byte is returned as an <code>int</code> in the range
+     * <code>0</code> to <code>255</code>. If no byte is available
+     * because the end of the stream has been reached, the value
+     * <code>-1</code> is returned. This method blocks until input data
+     * is available, the end of the stream is detected, or an exception
+     * is thrown.
+     * <p>
+     * This method
+     * simply performs <code>in.read()</code> and returns the result.
+     *
+     * @return     the next byte of data, or <code>-1</code> if the end of the
+     *             stream is reached.
+     * @exception  IOException  if an I/O error occurs.
+     * @see        java.io.FilterInputStream#in
+     */
+    @Override
+    public int read() throws IOException {
+	return iis.read();
+    }
+
+    /**
+     * Reads up to <code>len</code> bytes of data from this input stream
+     * into an array of bytes. If <code>len</code> is not zero, the method
+     * blocks until some input is available; otherwise, no
+     * bytes are read and <code>0</code> is returned.
+     * <p>
+     * This method simply performs <code>in.read(b, off, len)</code>
+     * and returns the result.
+     *
+     * @param      b     the buffer into which the data is read.
+     * @param      off   the start offset in the destination array <code>b</code>
+     * @param      len   the maximum number of bytes read.
+     * @return     the total number of bytes read into the buffer, or
+     *             <code>-1</code> if there is no more data because the end of
+     *             the stream has been reached.
+     * @exception  NullPointerException If <code>b</code> is <code>null</code>.
+     * @exception  IndexOutOfBoundsException If <code>off</code> is negative,
+     * <code>len</code> is negative, or <code>len</code> is greater than
+     * <code>b.length - off</code>
+     * @exception  IOException  if an I/O error occurs.
+     * @see        java.io.FilterInputStream#in
+     */
+    @Override
+    public int read(byte b[], int off, int len) throws IOException {
+	return iis.read(b, off, len);
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * This method simply performs <code>in.skip(n)</code>.
+     */
+    @Override
+    public long skip(long n) throws IOException {
+	return iis.skipBytes(n);
+    }
+
+    /**
+     * Returns an estimate of the number of bytes that can be read (or
+     * skipped over) from this input stream without blocking by the next
+     * caller of a method for this input stream. The next caller might be
+     * the same thread or another thread.  A single read or skip of this
+     * many bytes will not block, but may read or skip fewer bytes.
+     * <p>
+     * This method returns the result of {@link #in in}.available().
+     *
+     * @return     an estimate of the number of bytes that can be read (or skipped
+     *             over) from this input stream without blocking.
+     * @exception  IOException  if an I/O error occurs.
+     */
+    @Override
+    public int available() throws IOException {
+	return  (iis.isCached()) ? //
+            (int)Math.min(Integer.MAX_VALUE, iis.length() - iis.getStreamPosition()) :
+            0;
+    }
+
+    /**
+     * Closes this input stream and releases any system resources
+     * associated with the stream.
+     * This
+     * method simply performs <code>in.close()</code>.
+     *
+     * @exception  IOException  if an I/O error occurs.
+     * @see        java.io.FilterInputStream#in
+     */
+    @Override
+    public void close() throws IOException {
+	iis.close();
+    }
+
+    /**
+     * Marks the current position in this input stream. A subsequent
+     * call to the <code>reset</code> method repositions this stream at
+     * the last marked position so that subsequent reads re-read the same bytes.
+     * <p>
+     * The <code>readlimit</code> argument tells this input stream to
+     * allow that many bytes to be read before the mark position gets
+     * invalidated.
+     * <p>
+     * This method simply performs <code>in.mark(readlimit)</code>.
+     *
+     * @param   readlimit   the maximum limit of bytes that can be read before
+     *                      the mark position becomes invalid.
+     * @see     java.io.FilterInputStream#in
+     * @see     java.io.FilterInputStream#reset()
+     */
+    @Override
+    public synchronized void mark(int readlimit) {
+	iis.mark();
+    }
+
+    /**
+     * Repositions this stream to the position at the time the
+     * <code>mark</code> method was last called on this input stream.
+     * <p>
+     * This method
+     * simply performs <code>in.reset()</code>.
+     * <p>
+     * Stream marks are intended to be used in
+     * situations where you need to read ahead a little to see what's in
+     * the stream. Often this is most easily done by invoking some
+     * general parser. If the stream is of the type handled by the
+     * parse, it just chugs along happily. If the stream is not of
+     * that type, the parser should toss an exception when it fails.
+     * If this happens within readlimit bytes, it allows the outer
+     * code to reset the stream and try another parser.
+     *
+     * @exception  IOException  if the stream has not been marked or if the
+     *               mark has been invalidated.
+     * @see        java.io.FilterInputStream#in
+     * @see        java.io.FilterInputStream#mark(int)
+     */
+    @Override
+    public synchronized void reset() throws IOException {
+	iis.reset();
+    }
+
+    /**
+     * Tests if this input stream supports the <code>mark</code>
+     * and <code>reset</code> methods.
+     * This method
+     * simply performs <code>in.markSupported()</code>.
+     *
+     * @return  <code>true</code> if this stream type supports the
+     *          <code>mark</code> and <code>reset</code> method;
+     *          <code>false</code> otherwise.
+     * @see     java.io.FilterInputStream#in
+     * @see     java.io.InputStream#mark(int)
+     * @see     java.io.InputStream#reset()
+     */
+    @Override
+    public boolean markSupported() {
+	return true;
+    }
+
+}