org.jboss.ejb.client.remoting.PackedInteger 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 (c) 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.ejb.client.remoting;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

/**
 * A {@link PackedInteger} is a variable-length integer. The most-significant bit of each byte of a
 * {@link PackedInteger} value indicates whether that byte is the final (lowest-order) byte of the value.
 * If the bit is 0, then this is the last byte; if the bit is 1, then there is at least one more subsequent
 * byte pending, and the current value should be shifted to the left by 7 bits to accommodate the next byte's data.
 * 
 * Note: {@link PackedInteger} cannot hold signed integer values.
 *
 * @author Carlo de Wolf
 */
@Deprecated // protocol internals, make non-public
public class PackedInteger {


    /**
     * Reads a {@link PackedInteger} value from the passed {@link DataInput input} and returns the
     * value of the integer.
     *
     * @param input The {@link DataInput} from which the {@link PackedInteger} value will be read
     * @return
     * @throws IOException
     * @throws IllegalArgumentException If the passed input is null
     */
    public static int readPackedInteger(final DataInput input) throws IOException {
        int b = input.readByte();
        if ((b & 0x80) == 0x80) {
            return readPackedInteger(input) << 7 | (b & 0x7F);
        }
        return b;
    }

    /**
     * Converts the passed value into a {@link PackedInteger} and writes it to the
     * {@link DataOutput output}
     *
     * @param output The {@link DataOutput} to which the {@link PackedInteger} is written to
     * @param value  The integer value which will be converted to a {@link PackedInteger}
     * @throws IOException
     * @throws IllegalArgumentException If the passed value is < 0. {@link PackedInteger} doesn't
     *                                  allow signed integer
     * @throws IllegalArgumentException If the passed output is null
     */
    public static void writePackedInteger(final DataOutput output, int value) throws IOException {
        if (value < 0)
            throw new IllegalArgumentException("Only unsigned integer can be packed");
        if (value > 127) {
            output.writeByte(value & 0x7F | 0x80);
            writePackedInteger(output, value >> 7);
        } else {
            output.writeByte(value & 0xFF);
        }
    }

}