/** *----------------------------------------------------------------------- *   This program is free software; you can redistribute it and/or modify *   it under the terms of the GNU Library General Public License as published *   by the Free Software Foundation; either version 2 of the License,or *   (at your option) any later version. * *   This program is distributed in the hope that it will be useful, *   but WITHOUT ANY WARRANTY; without even the implied warranty of *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *   GNU Library General Public License for more details. * *   You should have received a copy of the GNU Library General Public *   License along with this program; if not,write to the Free Software *   Foundation,Inc.,675 Mass Ave,Cambridge,MA 02139,USA. *---------------------------------------------------------------------- */package javazoom.jlme.decoder;import java.io.InputStream;import java.io.IOException;public class PushBackStream{    private byte[] buf;    private int pos,temp,temp2,avail;    private long pskip;    private InputStream in;    public PushBackStream(InputStream in,int size) {	this.in = in;        this.buf = new byte[size];	this.pos = size;    }    public int read(byte[] b,int off,int len) throws IOException {        avail = buf.length - pos;	if (avail > 0) {	    if (len < avail)		avail = len;            if(avail==3){              temp = pos;              temp2 = off;              b[temp2++] = buf[temp++];              b[temp2++] = buf[temp++];              b[temp2] = buf[temp];            }            else{ //equals 1              b[off]= buf[pos];            }            pos += avail;	    off += avail;	    len -= avail;	}        if (len > 0) {          if ((len = in.read(b,off,len)) == -1)            return avail == 0 ? -1 : avail;          return avail + len;	}        return avail;    }    public void unread(byte[] b,int off,int len){	temp = pos -= 4;        buf[temp++] = b[off++];        buf[temp++] = b[off++];        buf[temp++] = b[off++];        buf[temp] = b[off++];    }    public synchronized void close() throws IOException {        if (in == null)            return;        in.close();        in = null;        buf = null;    }}