/*
* #%L
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* - Board of Regents of the University of Wisconsin-Madison
* - Glencoe Software, Inc.
* - University of Dundee
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* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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/*
* $RCSfile: ByteOutputBuffer.java,v $
* $Revision: 1.1 $
* $Date: 2005/02/11 05:02:07 $
* $State: Exp $
*
* Class: ByteOutputBuffer
*
* Description: Provides buffering for byte based output, similar
* to the standard class ByteArrayOutputStream
*
* the old jj2000.j2k.io.ByteArrayOutput class by
* Diego SANTA CRUZ, Apr-26-1999
*
*
* COPYRIGHT:
*
* This software module was originally developed by Raphaël Grosbois and
* Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
* Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
* Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
* Centre France S.A) in the course of development of the JPEG2000
* standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
* software module is an implementation of a part of the JPEG 2000
* Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
* Systems AB and Canon Research Centre France S.A (collectively JJ2000
* Partners) agree not to assert against ISO/IEC and users of the JPEG
* 2000 Standard (Users) any of their rights under the copyright, not
* including other intellectual property rights, for this software module
* with respect to the usage by ISO/IEC and Users of this software module
* or modifications thereof for use in hardware or software products
* claiming conformance to the JPEG 2000 Standard. Those intending to use
* this software module in hardware or software products are advised that
* their use may infringe existing patents. The original developers of
* this software module, JJ2000 Partners and ISO/IEC assume no liability
* for use of this software module or modifications thereof. No license
* or right to this software module is granted for non JPEG 2000 Standard
* conforming products. JJ2000 Partners have full right to use this
* software module for his/her own purpose, assign or donate this
* software module to any third party and to inhibit third parties from
* using this software module for non JPEG 2000 Standard conforming
* products. This copyright notice must be included in all copies or
* derivative works of this software module.
*
* Copyright (c) 1999/2000 JJ2000 Partners.
*
*
*
*/
package jj2000.j2k.entropy.encoder;
import java.io.*;
/**
* This class provides a buffering output stream similar to
* ByteArrayOutputStream, with some additional methods.
*
* <P>Once an array has been written to an output stream or to a byte
* array, the object can be reused as a new stream if the reset()
* method is called.
*
* <P>Unlike the ByteArrayOutputStream class, this class is not thread safe.
*
* @see #reset
* */
public class ByteOutputBuffer {
/** The buffer where the data is stored */
byte buf[];
/** The number of valid bytes in the buffer */
int count;
/** The buffer increase size */
public final static int BUF_INC = 512;
/** The default initial buffer size */
public final static int BUF_DEF_LEN = 256;
/**
* Creates a new byte array output stream. The buffer capacity is
* initially BUF_DEF_LEN bytes, though its size increases if necessary.
*
*
* */
public ByteOutputBuffer() {
buf = new byte[BUF_DEF_LEN];
}
/**
* Creates a new byte array output stream, with a buffer capacity
* of the specified size, in bytes.
*
* @param size the initial size.
*
*
* */
public ByteOutputBuffer(int size) {
buf = new byte[size];
}
/**
* Writes the specified byte to this byte array output stream. The
* functionality provided by this implementation is the same as for the
* one in the superclass, however this method is not synchronized and
* therefore not safe thread, but faster.
*
* @param b The byte to write
*
*
* */
public final void write(int b) {
if (count == buf.length) { // Resize buffer
byte tmpbuf[] = buf;
buf = new byte[buf.length+BUF_INC];
System.arraycopy(tmpbuf,0,buf,0,count);
}
buf[count++] = (byte) b;
}
/**
* Copies the specified part of the stream to the 'outbuf' byte
* array.
*
* @param off The index of the first element in the stream to
* copy.
*
* @param len The number of elements of the array to copy
*
* @param outbuf The destination array
*
* @param outoff The index of the first element in 'outbuf' where
* to write the data.
*
*
* */
public void toByteArray(int off, int len, byte outbuf[], int outoff) {
// Copy the data
System.arraycopy(buf,off,outbuf,outoff,len);
}
/**
* Returns the number of valid bytes in the output buffer (count class
* variable).
*
* @return The number of bytes written to the buffer
*
* */
public int size() {
return count;
}
/**
* Discards all the buffered data, by resetting the counter of written
* bytes to 0.
*
* */
public void reset() {
count = 0;
}
/**
* Returns the byte buffered at the given position in the buffer. The
* position in the buffer is the index of the 'write()' method call after
* the last call to 'reset()'.
*
* @param pos The position of the byte to return
*
* @return The value (betweeb 0-255) of the byte at position 'pos'.
*
* */
public int getByte(int pos) {
if (pos >= count) {
throw new IllegalArgumentException();
}
return buf[pos]&0xFF;
}
}