/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.fileupload.util;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
An input stream, which limits its data size. This stream is
used, if the content length is unknown.
/**
* An input stream, which limits its data size. This stream is
* used, if the content length is unknown.
*/
public abstract class LimitedInputStream extends FilterInputStream implements Closeable {
The maximum size of an item, in bytes.
/**
* The maximum size of an item, in bytes.
*/
private final long sizeMax;
The current number of bytes.
/**
* The current number of bytes.
*/
private long count;
Whether this stream is already closed.
/**
* Whether this stream is already closed.
*/
private boolean closed;
Creates a new instance.
Params: - inputStream – The input stream, which shall be limited.
- pSizeMax – The limit; no more than this number of bytes
shall be returned by the source stream.
/**
* Creates a new instance.
*
* @param inputStream The input stream, which shall be limited.
* @param pSizeMax The limit; no more than this number of bytes
* shall be returned by the source stream.
*/
public LimitedInputStream(InputStream inputStream, long pSizeMax) {
super(inputStream);
sizeMax = pSizeMax;
}
Called to indicate, that the input streams limit has
been exceeded.
Params: - pSizeMax – The input streams limit, in bytes.
- pCount – The actual number of bytes.
Throws: - IOException – The called method is expected
to raise an IOException.
/**
* Called to indicate, that the input streams limit has
* been exceeded.
*
* @param pSizeMax The input streams limit, in bytes.
* @param pCount The actual number of bytes.
* @throws IOException The called method is expected
* to raise an IOException.
*/
protected abstract void raiseError(long pSizeMax, long pCount)
throws IOException;
Called to check, whether the input streams
limit is reached.
Throws: - IOException – The given limit is exceeded.
/**
* Called to check, whether the input streams
* limit is reached.
*
* @throws IOException The given limit is exceeded.
*/
private void checkLimit() throws IOException {
if (count > sizeMax) {
raiseError(sizeMax, count);
}
}
Reads the next byte of data from this input stream. The value
byte is returned as an int
in the range
0
to 255
. If no byte is available
because the end of the stream has been reached, the value
-1
is returned. This method blocks until input data
is available, the end of the stream is detected, or an exception
is thrown.
This method
simply performs in.read()
and returns the result.
Throws: - IOException – if an I/O error occurs.
See Also: - FilterInputStream.in
Returns: the next byte of data, or -1
if the end of the
stream is reached.
/**
* Reads the next byte of data from this input stream. The value
* byte is returned as an <code>int</code> in the range
* <code>0</code> to <code>255</code>. If no byte is available
* because the end of the stream has been reached, the value
* <code>-1</code> is returned. This method blocks until input data
* is available, the end of the stream is detected, or an exception
* is thrown.
* <p>
* This method
* simply performs <code>in.read()</code> and returns the result.
*
* @return the next byte of data, or <code>-1</code> if the end of the
* stream is reached.
* @throws IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
@Override
public int read() throws IOException {
int res = super.read();
if (res != -1) {
count++;
checkLimit();
}
return res;
}
Reads up to len
bytes of data from this input stream
into an array of bytes. If len
is not zero, the method
blocks until some input is available; otherwise, no
bytes are read and 0
is returned.
This method simply performs in.read(b, off, len)
and returns the result.
Params: - b – the buffer into which the data is read.
- off – The start offset in the destination array
b
. - len – the maximum number of bytes read.
Throws: - NullPointerException – If
b
is null
. - IndexOutOfBoundsException – If
off
is negative,
len
is negative, or len
is greater than
b.length - off
- IOException – if an I/O error occurs.
See Also: - FilterInputStream.in
Returns: the total number of bytes read into the buffer, or
-1
if there is no more data because the end of
the stream has been reached.
/**
* Reads up to <code>len</code> bytes of data from this input stream
* into an array of bytes. If <code>len</code> is not zero, the method
* blocks until some input is available; otherwise, no
* bytes are read and <code>0</code> is returned.
* <p>
* This method simply performs <code>in.read(b, off, len)</code>
* and returns the result.
*
* @param b the buffer into which the data is read.
* @param off The start offset in the destination array
* <code>b</code>.
* @param len the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or
* <code>-1</code> if there is no more data because the end of
* the stream has been reached.
* @throws NullPointerException If <code>b</code> is <code>null</code>.
* @throws IndexOutOfBoundsException If <code>off</code> is negative,
* <code>len</code> is negative, or <code>len</code> is greater than
* <code>b.length - off</code>
* @throws IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
@Override
public int read(byte[] b, int off, int len) throws IOException {
int res = super.read(b, off, len);
if (res > 0) {
count += res;
checkLimit();
}
return res;
}
Returns, whether this stream is already closed.
Throws: - IOException – An I/O error occurred.
Returns: True, if the stream is closed, otherwise false.
/**
* Returns, whether this stream is already closed.
*
* @return True, if the stream is closed, otherwise false.
* @throws IOException An I/O error occurred.
*/
@Override
public boolean isClosed() throws IOException {
return closed;
}
Closes this input stream and releases any system resources
associated with the stream.
This
method simply performs in.close()
.
Throws: - IOException – if an I/O error occurs.
See Also: - FilterInputStream.in
/**
* Closes this input stream and releases any system resources
* associated with the stream.
* This
* method simply performs <code>in.close()</code>.
*
* @throws IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
@Override
public void close() throws IOException {
closed = true;
super.close();
}
}