/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.graylog2.shared.utilities;

import java.nio.ByteBuffer;

public abstract class ByteBufferUtils {
    /**
     * Read the given byte buffer into a byte array
     */
    public static byte[] readBytes(ByteBuffer buffer) {
        return readBytes(buffer, 0, buffer.limit());
    }

    /**
     * Read a byte array from the given offset and size in the buffer
     */
    public static byte[] readBytes(ByteBuffer buffer, int offset, int size) {
        final byte[] dest = new byte[size];
        if (buffer.hasArray()) {
            System.arraycopy(buffer.array(), buffer.arrayOffset() + offset, dest, 0, size);
        } else {
            buffer.mark();
            buffer.get(dest);
            buffer.reset();
        }

        return dest;
    }
}