/**
* MediaFrame is an Open Source streaming media platform in Java
* which provides a fast, easy to implement and extremely small applet
* that enables to view your audio/video content without having
* to rely on external player applications or bulky plug-ins.
*
* Copyright (C) 2004/5 MediaFrame (http://www.mediaframe.org).
*
* 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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
package org.ripple.power.sound;
import java.io.IOException;
import java.io.EOFException;
import java.io.InputStream;
/**
* <code>DataStream</code>
*/
public final class DataStream {
/** The MPEG4 input stream. */
private InputStream is;
/** The current offset (position) in the stream. */
private long offset = 0;
/**
* Constructs an <code>DataStream</code> object using the specified MPEG4
* input stream.
*
* @param is
* the MPEG4 input stream.
*/
public DataStream(InputStream is) {
super();
this.is = is;
}
public long readBytes(int n) throws IOException {
int c = -1;
long result = 0;
while ((n-- > 0) && ((c = is.read()) != -1)) {
result <<= 8;
result += c & 0xff;
offset++;
}
if (c == -1)
throw new EOFException();
return result;
}
public String readString(int n) throws IOException {
char c = (char) -1;
StringBuffer sb = new StringBuffer();
while ((n-- > 0) && ((c = (char) is.read()) != -1)) {
sb.append(c);
offset++;
}
if (c == -1) {
throw new EOFException();
}
return sb.toString();
}
public void skipBytes(long n) throws IOException {
offset += n;
is.skip(n);
}
public long getOffset() {
return offset;
}
}