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  /*
   * @(#)ByteArrayImageInputStream.java  
   *
   * Copyright (c) 2008-2011 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;
 
A ByteArrayImageInputStream contains an internal buffer that contains bytes that may be read from the stream. An internal counter keeps track of the next byte to be supplied by the read method.

Closing a ByteArrayImageInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

Author(s):
Werner Randelshofer, Hausmatt 10, CH-6405 Goldau
Version:
$Id: ByteArrayImageInputStream.java 299 2013-01-03 07:40:18Z werner $
 
 public class ByteArrayImageInputStream extends ImageInputStreamImpl2 {
    
An array of bytes that was provided by the creator of the stream. Elements buf[0] through buf[count-1] are the only bytes that can ever be read from the stream; element buf[streamPos] is the next byte to be read.
 
     protected byte buf[];

    
The index one greater than the last valid character in the input stream buffer. This value should always be nonnegative and not larger than the length of buf. It is one greater than the position of the last byte within buf that can ever be read from the input stream buffer.
 
     protected int count;

    
The offset to the start of the array.
 
     private final int arrayOffset;
 
     public ByteArrayImageInputStream(byte[] buf) {
         this(buf.);
     }
 
     public ByteArrayImageInputStream(byte[] bufByteOrder byteOrder) {
         this(buf, 0, buf.lengthbyteOrder);
     }
 
     public ByteArrayImageInputStream(byte[] bufint offsetint lengthByteOrder byteOrder) {
 	this. = buf;
         this. = offset;
 	this. = Math.min(offset + lengthbuf.length);
         this. = offset;
         this. = byteOrder;
     }

    
Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned.

This read method cannot block.

Returns:
the next byte of data, or -1 if the end of the stream has been reached.
 
     @Override
     public synchronized int read() {
         flushBits();
 	return ( < ) ? ([(int)(++)] & 0xff) : -1;
     }

    
Reads up to len bytes of data into an array of bytes from this input stream. If streamPos equals count, then -1 is returned to indicate end of file. Otherwise, the number k of bytes read is equal to the smaller of len and count-streamPos. If k is positive, then bytes buf[streamPos] through buf[streamPos+k-1] are copied into b[off] through b[off+k-1] in the manner performed by System.arraycopy. The value k is added into streamPos and k is returned.

This read method cannot block.

Parameters:
b the buffer into which the data is read.
off the start offset in the destination array b
len the maximum number of bytes read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
java.lang.NullPointerException If b is null.
java.lang.IndexOutOfBoundsException If off is negative, len is negative, or len is greater than b.length - off
    @Override
    public synchronized int read(byte b[], int offint len) {
        flushBits();
	if (b == null) {
	    throw new NullPointerException();
else if (off < 0 || len < 0 || len > b.length - off) {
	    throw new IndexOutOfBoundsException();
	}
	if ( >= ) {
	    return -1;
	}
	if ( + len > ) {
	    len = (int)( - );
	}
	if (len <= 0) {
	    return 0;
	}
	System.arraycopy(, (int)bofflen);
	 += len;
	return len;
    }

    
Skips n bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. The actual number k of bytes to be skipped is equal to the smaller of n and count-streamPos. The value k is added into streamPos and k is returned.

Parameters:
n the number of bytes to be skipped.
Returns:
the actual number of bytes skipped.
    public synchronized long skip(long n) {
	if ( + n > ) {
	    n =  - ;
	}
	if (n < 0) {
	    return 0;
	}
	 += n;
	return n;
    }

    
Returns the number of remaining bytes that can be read (or skipped over) from this input stream.

The value returned is count - streamPos, which is the number of bytes remaining to be read from the input buffer.

Returns:
the number of remaining bytes that can be read (or skipped over) from this input stream without blocking.
    public synchronized int available() {
	return (int)( - );
    }



    
Closing a ByteArrayInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

    @Override
    public void close() {
        // does nothing!!
    }
    @Override
    public long getStreamPosition() throws IOException {
        checkClosed();
        return -;
    }
    @Override
    public void seek(long posthrows IOException {
        checkClosed();
        flushBits();
        // This test also covers pos < 0
        if (pos < ) {
            throw new IndexOutOfBoundsException("pos < flushedPos!");
        }
        this. = pos+;
    }
    private void flushBits() {
        =0;
    }
    @Override
    public long length() {
        return -;
    }
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