org.jboss.marshalling.LimitedByteInput Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.jboss.marshalling;
import java.io.IOException;
/**
* A limited byte input stream. Throws an exception if too many bytes are read.
*/
public class LimitedByteInput extends ByteInputStream {
private final long limit;
private long count;
/**
* Create a new instance.
*
* @param byteInput the byte input to read from
* @param limit the maximum number of bytes to read
*/
public LimitedByteInput(final ByteInput byteInput, final long limit) {
super(byteInput);
this.limit = limit;
}
/** {@inheritDoc} */
public int read() throws IOException {
final long count = this.count;
if (count < limit) try {
return super.read();
} finally {
this.count = count + 1;
}
throw new IOException("Limit exceeded");
}
/** {@inheritDoc} */
public int read(final byte[] b, final int off, final int len) throws IOException {
final long count = this.count;
final long limit = this.limit;
final int ret;
if (count >= limit) {
throw new IOException("Limit exceeded");
} else if (count + len >= limit) {
int rem = (int) (limit - count);
ret = super.read(b, off, rem);
} else {
ret = super.read(b, off, len);
}
this.count = count + (long) ret;
return ret;
}
/** {@inheritDoc} */
public long skip(final long n) throws IOException {
final long count = this.count;
final long limit = this.limit;
final long ret;
if (count >= limit) {
throw new IOException("Limit exceeded");
} else if (count + n >= limit) {
int rem = (int) (limit - count);
ret = super.skip(rem);
} else {
ret = super.skip(n);
}
this.count = count + ret;
return ret;
}
}