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/*******************************************************************************
* Copyright (c) 2001, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.sse.core.internal.encoding.util;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
public class BufferedLimitedStream extends BufferedInputStream {
private int limitedCount;
public BufferedLimitedStream(InputStream inStream, int size) {
super(inStream, size);
mark(size);
try {
limitedCount = Math.min(size, inStream.available());
} catch (IOException e) {
// unlikely
limitedCount = 0;
}
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#available()
*/
public synchronized int available() throws IOException {
return limitedCount - pos;
}
/**
* copied down from super class
*/
private void ensureOpen() throws IOException {
if (in == null)
throw new IOException("Stream closed"); //$NON-NLS-1$
}
/**
* copied down from super class then, changed to simiulate EOF if goes
* beyond buffered amount
*/
public synchronized int read() throws IOException {
ensureOpen();
// for this special stream, indicate "end of file" when buffer is
// full
if (pos >= limitedCount) {
return -1;
}
return super.read();
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read(byte[], int, int)
*/
public synchronized int read(byte[] b, int off, int len) throws IOException {
// for this special stream, indicate "end of file" when buffer is
// full
if (pos >= limitedCount) {
return -1;
}
return super.read(b, off, len);
}
}
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