/* * CVS identifier: * * $Id: ByteOutputBuffer.java,v 1.9 2000/09/21 16:13:00 dsanta 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 Rapha雔 Grosbois and * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel * Askel鰂 (Ericsson Radio Systems AB); and Bertrand Berthelot, David * Bouchard, F閘ix 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;    }}