org.jboss.marshalling.ByteBufferInput 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).

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/*
 * 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 {
    }
}