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/*
* Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
* Original author: Edmund Wagner
* Creation date: 26.06.2007
*
* Source: $HeadURL$
* Last changed: $LastChangedDate$
*
* the unrar licence applies to all junrar source and binary distributions
* you are not allowed to use this source to re-create the RAR compression
* algorithm
*
* Here some html entities which can be used for escaping javadoc tags:
* "&": "&" or "&"
* "<": "<" or "<"
* ">": ">" or ">"
* "@": "@"
*/
package com.github.junrar.io;
import java.io.IOException;
import java.io.InputStream;
/**
* DOCUMENT ME
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class ReadOnlyAccessInputStream extends InputStream {
private IReadOnlyAccess file;
private long curPos;
private final long startPos;
private final long endPos;
public ReadOnlyAccessInputStream(IReadOnlyAccess file, long startPos,
long endPos) throws IOException {
super();
this.file = file;
this.startPos = startPos;
curPos = startPos;
this.endPos = endPos;
file.setPosition(curPos);
}
@Override
public int read() throws IOException {
if (curPos == endPos) {
return -1;
}
else {
int b = file.read();
curPos++;
return b;
}
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0) {
return 0;
}
if (curPos == endPos) {
return -1;
}
int bytesRead = file.read(b, off,
(int)Math.min(len, endPos - curPos));
curPos += bytesRead;
return bytesRead;
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
//
// public void close() throws IOException {
// file.close();
// }
}
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