/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.ignite.internal.network.direct;

import java.nio.ByteBuffer;
import org.apache.ignite.internal.network.direct.stream.DirectByteBufferStream;

/**
 * Direct marshalling utils.
 */
public class DirectMarshallingUtils {
    /**
     * Reads a {@code short} from a byte buffer in an order defined by the {@link DirectByteBufferStream} implementation.
     *
     * @param buffer Byte buffer.
     * @return Direct message type.
     */
    public static short getShort(ByteBuffer buffer) {
        byte b0 = buffer.get();
        byte b1 = buffer.get();

        return asShort(b0, b1);
    }

    /**
     * Concatenates the two parameter bytes to form a {@code short}.
     *
     * @param b0 The first byte.
     * @param b1 The second byte.
     */
    private static short asShort(byte b0, byte b1) {
        return (short) ((b1 & 0xFF) << 8 | b0 & 0xFF);
    }
}
