jpexs-decompiler/trunk/src/com/jpexs/decompiler/flash/ReReadableInputStream.java

/*
 *  Copyright (C) 2010-2013 JPEXS
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 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 General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.jpexs.decompiler.flash;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 *
 * @author JPEXS
 */
public class ReReadableInputStream extends InputStream {

    InputStream is;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    byte[] converted;
    int pos = 0;
    int count = 0;

    public int getCount() {
        return count;
    }

    public byte[] getAllRead() {
        return baos.toByteArray();
    }

    public int getPos() {
        return pos;
    }

    public ReReadableInputStream(InputStream is) {
        this.is = is;
    }

    public void setPos(int pos) throws IOException {
        if (pos > count) {
            this.pos = count;
            skip(pos - count);
        }
        this.pos = pos;
    }

    @Override
    public int read() throws IOException {
        if (pos < count) {
            if (converted == null) {
                converted = baos.toByteArray();
            }
            int ret = converted[pos] & 0xff;
            pos++;
            return ret;
        }
        int i = is.read();
        if (i > -1) {
            baos.write(i);
            count++;
        }
        pos++;
        converted = null;

        return i;
    }

    @Override
    public int available() throws IOException {
        return (count + is.available()) - pos;
    }

    public long length() throws IOException {
        return count + is.available();
    }
}