org.jboss.marshalling.ByteBufferInput Maven / Gradle / Ivy
/*
* 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;
import java.io.InputStream;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
/**
* An {@code InputStream} which implements {@code ByteInput} and reads bytes from a {@code ByteBuffer}.
*/
public class ByteBufferInput extends InputStream implements ByteInput {
private final ByteBuffer buffer;
/**
* Construct a new instance.
*
* @param buffer the buffer to read from
*/
public ByteBufferInput(final ByteBuffer buffer) {
this.buffer = buffer;
}
/** {@inheritDoc} */
public int read() throws IOException {
try {
return buffer.get() & 0xff;
} catch (BufferUnderflowException e) {
return -1;
}
}
/** {@inheritDoc} */
public int read(final byte[] b) throws IOException {
return read(b, 0, b.length);
}
/** {@inheritDoc} */
public int read(final byte[] b, final int off, final int len) throws IOException {
if (len == 0) {
return 0;
}
final int rem = buffer.remaining();
if (rem == 0) {
return -1;
}
final int c = Math.min(len, rem);
buffer.get(b, off, c);
return c;
}
/** {@inheritDoc} */
public int available() throws IOException {
return buffer.remaining();
}
/** {@inheritDoc} */
public long skip(final long n) throws IOException {
if (n > 0L) {
final long c = Math.min((long) buffer.remaining(), n);
buffer.position(buffer.position() + (int) c);
return c;
} else {
return 0L;
}
}
/** {@inheritDoc} */
public void close() throws IOException {
}
}