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 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 2017 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.remoting3.remote;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;

import org.xnio.Buffers;

import static org.xnio.Buffers.take;

final class ProtocolUtils {

    private ProtocolUtils() {
    }

    static void writeString(ByteBuffer buffer, byte type, String data) {
        buffer.put(type);
        final byte[] bytes = data.getBytes(StandardCharsets.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(StandardCharsets.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), StandardCharsets.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();
        }
    }

}