org.jboss.remoting3.remote.ProtocolUtils Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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 2011, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt 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.remoting3.remote;

import java.nio.ByteBuffer;
import java.util.Random;
import org.xnio.Buffers;

import static org.jboss.remoting3.remote.Protocol.UTF_8;
import static org.xnio.Buffers.take;

final class ProtocolUtils {

    static final ThreadLocal randomHolder = new ThreadLocal() {
        protected Random initialValue() {
            return new Random(System.nanoTime() * 1024L + Thread.currentThread().getId());
        }
    };

    private ProtocolUtils() {
    }

    static void writeString(ByteBuffer buffer, byte type, String data) {
        buffer.put(type);
        final byte[] bytes = data.getBytes(UTF_8);
        final int length = Math.min(255, bytes.length);
        buffer.put((byte) length);
        buffer.put(bytes, 0, length);
    }

    static void writeString(ByteBuffer buffer, String data) {
        final byte[] bytes = data.getBytes(UTF_8);
        final int length = Math.min(255, bytes.length);
        buffer.put((byte) length);
        buffer.put(bytes, 0, length);
    }

    static void writeByte(ByteBuffer buffer, int type, int value) {
        buffer.put((byte) type);
        buffer.put((byte) 1);
        buffer.put((byte) value);
    }

    static void writeShort(ByteBuffer buffer, int type, int value) {
        buffer.put((byte) type);
        buffer.put((byte) 2);
        buffer.putShort((short) value);
    }

    static void writeInt(ByteBuffer buffer, int type, int value) {
        buffer.put((byte) type);
        buffer.put((byte) 4);
        buffer.putInt(value);
    }

    static void writeLong(ByteBuffer buffer, int type, long value) {
        buffer.put((byte) type);
        buffer.put((byte) 8);
        buffer.putLong(value);
    }

    static void writeBytes(ByteBuffer buffer, final int type, final byte[] value) {
        buffer.put((byte) type);
        buffer.put((byte) value.length);
        buffer.put(value);
    }

    static void writeEmpty(final ByteBuffer buffer, final int type) {
        buffer.put((byte) type);
        buffer.put((byte) 0);
    }

    static String readString(ByteBuffer buffer) {
        int length = buffer.get() & 0xff;
        return new String(take(buffer, length), UTF_8);
    }

    static int readInt(final ByteBuffer buffer) {
        int length = buffer.get() & 0xff;
        return readIntData(buffer, length);
    }

    static int readIntData(final ByteBuffer buffer, final int length) {
        switch (length) {
            case 0: return 0;
            case 1: return buffer.get() & 0xff;
            case 2: return buffer.getShort() & 0xffff;
            case 3: return ((buffer.get() & 0xff) << 16) + (buffer.getShort() & 0xffff);
            case 4: return buffer.getInt();
            default: Buffers.skip(buffer, length - 4);
                return buffer.getInt();
        }
    }

    static int readUnsignedShort(final ByteBuffer buffer) {
        int length = buffer.get() & 0xff;
        switch (length) {
            case 0: return 0;
            case 1: return buffer.get() & 0xff;
            case 2: return buffer.getShort() & 0xffff;
            default: Buffers.skip(buffer, length - 2);
                return buffer.getShort() & 0xffff;
        }
    }

    static long readLong(final ByteBuffer buffer) {
        int length = buffer.get() & 0xff;
        switch (length) {
            case 0: return 0;
            case 1: return buffer.get() & 0xffL;
            case 2: return buffer.getShort() & 0xffffL;
            case 3: return ((buffer.get() & 0xffL) << 16) + (buffer.getShort() & 0xffffL);
            case 4: return buffer.getInt() & 0xffffffffL;
            case 5: return ((buffer.get() & 0xffL) << 32) + (buffer.getInt() & 0xffffffffL);
            case 6: return ((buffer.getShort() & 0xffffL) << 32) + (buffer.getInt() & 0xffffffffL);
            case 7: return ((buffer.get() & 0xffL) << 48) + ((buffer.getShort() & 0xffffL) << 32) + (buffer.getInt() & 0xffffffffL);
            case 8: return buffer.getLong();
            default: Buffers.skip(buffer, length - 8);
                return buffer.getLong();
        }
    }

}