/*
* Licensed under the GPL License. You may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
package com.googlecode.psiprobe.tools;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
public class BackwardsFileStream extends InputStream {
private RandomAccessFile raf;
private long seekPos;
public BackwardsFileStream(File file) throws IOException {
raf = new RandomAccessFile(file, "r");
seekPos = raf.length();
}
public BackwardsFileStream(File file, long pos) throws IOException {
raf = new RandomAccessFile(file, "r");
seekPos = pos;
}
public int read() throws IOException {
if (seekPos > 0) {
raf.seek(--seekPos);
return raf.read();
} else {
//
// return EOF (so to speak)
//
return -1;
}
}
public void close() throws IOException {
if (raf != null) {
raf.close();
}
}
}