com.github.mrstampy.pprspray.core.streamer.footer.MediaFooterChunk.java Source code

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Here is the source code for com.github.mrstampy.pprspray.core.streamer.footer.MediaFooterChunk.java

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/*
 * PepperSpray-core, Encrypted Secure Communications Library
 * 
 * Copyright (C) 2014 Burton Alexander
 * 
 * This program 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 2 of the License, or (at your option) any later
 * version.
 * 
 * This program 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
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * 
 */
package com.github.mrstampy.pprspray.core.streamer.footer;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

import java.util.Arrays;

import com.github.mrstampy.pprspray.core.streamer.MediaStreamType;
import com.github.mrstampy.pprspray.core.streamer.chunk.AbstractMediaChunk;
import com.github.mrstampy.pprspray.core.streamer.util.MediaStreamerUtils;

/**
 * The Class MediaFooterChunk represents the received {@link MediaFooter}
 * message.
 */
public class MediaFooterChunk extends AbstractMediaChunk {

    private static final long serialVersionUID = -2298381545581713528L;

    /**
     * The Constructor.
     *
     * @param message
     *          the message
     */
    public MediaFooterChunk(byte[] message) {
        super(message, null);
    }

    /**
     * Extract media hash.
     *
     * @param message
     *          the message
     */
    protected void extractMediaHash(byte[] message) {
        setMediaHash(extractInt(message, 8, 12));
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.github.mrstampy.pprspray.core.streamer.chunk.AbstractMediaChunk#
     * extractMessageHash(byte[])
     */
    protected void extractMessageHash(byte[] message) {
        setMessageHash(extractInt(message, 4, 8));
    }

    private int extractInt(byte[] message, int start, int end) {
        byte[] hash = Arrays.copyOfRange(message, start, end);

        ByteBuf buf = Unpooled.copiedBuffer(hash);

        return buf.getInt(0);
    }

    /**
     * Extract media stream type.
     *
     * @param message
     *          the message
     * @param expected
     *          the expected
     */
    protected void extractMediaStreamType(byte[] message, MediaStreamType expected) {
        MediaStreamType type = MediaStreamerUtils.getMediaStreamTypeAsFooter(message);
        if (type == null)
            throw new IllegalArgumentException("Message is not a media type message");

        setMediaStreamType(type);
    }

    /**
     * Extract header length.
     *
     * @param message
     *          the message
     */
    protected void extractHeaderLength(byte[] message) {
        setHeaderLength(MediaStreamerUtils.FOOTER_LENGTH);
    }

    /**
     * Extract sequence.
     *
     * @param message
     *          the message
     */
    protected void extractSequence(byte[] message) {
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.github.mrstampy.pprspray.core.streamer.chunk.AbstractMediaChunk#
     * extractAckRequired(byte[])
     */
    protected void extractAckRequired(byte[] message) {
    }

    /**
     * Checks if is terminate message.
     *
     * @param mediaHash
     *          the media hash
     * @return true, if checks if is terminate message
     */
    public boolean isTerminateMessage(int mediaHash) {
        return isApplicable(MediaStreamType.NEGOTIATION, mediaHash);
    }

}