/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2009 Sun Microsystems, Inc.
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*/
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package com.sun.opends.sdk.util;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* An implementation of input stream that enforces an read size limit.
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*/
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public class SizeLimitInputStream extends InputStream
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{
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private int bytesRead;
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private int markBytesRead;
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private final int readLimit;
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private final InputStream parentStream;
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/**
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* Creates a new a new size limit input stream.
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*
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* @param parentStream
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* The parent stream.
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* @param readLimit
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* The size limit.
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*/
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public SizeLimitInputStream(final InputStream parentStream,
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final int readLimit)
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{
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this.parentStream = parentStream;
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this.readLimit = readLimit;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int available() throws IOException
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{
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final int streamAvail = parentStream.available();
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final int limitedAvail = readLimit - bytesRead;
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return limitedAvail < streamAvail ? limitedAvail : streamAvail;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void close() throws IOException
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{
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parentStream.close();
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}
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/**
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* Retrieves the number of bytes read from this stream.
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*
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* @return The number of bytes read from this stream.
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*/
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public int getBytesRead()
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{
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return bytesRead;
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}
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/**
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* Retrieves the size limit of this stream.
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*
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* @return The size limit of this stream.
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*/
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public int getSizeLimit()
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{
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return readLimit;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public synchronized void mark(final int readlimit)
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{
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parentStream.mark(readlimit);
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markBytesRead = bytesRead;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean markSupported()
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{
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return parentStream.markSupported();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int read() throws IOException
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{
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if (bytesRead >= readLimit)
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{
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return -1;
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}
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final int b = parentStream.read();
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if (b != -1)
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{
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++bytesRead;
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}
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return b;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int read(final byte b[], final int off, int len) throws IOException
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{
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if (off < 0 || len < 0 || off + len > b.length)
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{
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throw new IndexOutOfBoundsException();
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}
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if (len == 0)
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{
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return 0;
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}
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if (bytesRead >= readLimit)
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{
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return -1;
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}
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if (bytesRead + len > readLimit)
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{
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len = readLimit - bytesRead;
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}
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final int readLen = parentStream.read(b, off, len);
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if (readLen > 0)
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{
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bytesRead += readLen;
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}
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return readLen;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public synchronized void reset() throws IOException
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{
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parentStream.reset();
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bytesRead = markBytesRead;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public long skip(long n) throws IOException
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{
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if (bytesRead + n > readLimit)
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{
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n = readLimit - bytesRead;
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}
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bytesRead += n;
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return parentStream.skip(n);
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}
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}
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