/**

 * Java RTP Library (jlibrtp)

 * Copyright (C) 2006 Arne Kepp

 * 

 * This library 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 library 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 library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 */

package jlibrtp;

/**

 * RTCP packets for sending Bye messages

 * 

 * @author Arne Kepp

 */

public class RtcpPktBYE extends RtcpPkt {

	/** SSRCs saying bye, 32xn bits, n<16 */

	protected long[] ssrcArray = null;

	/** Optional reason */

	protected byte[] reason = null;

	protected RtcpPktBYE(long[] ssrcs, byte[] aReason) {

		super.packetType = 203;

		// Fetch all the right stuff from the database

		reason = aReason;

		ssrcArray = ssrcs;

		if (ssrcs.length < 1) {

			System.out

					.println("RtcpBYE.RtcpPktBYE(long[] ssrcs, byte[] aReason) requires at least one SSRC!");

		}

	}

	protected RtcpPktBYE(byte[] aRawPkt, int start) {

		rawPkt = aRawPkt;

		if (!super.parseHeaders(start) || packetType != 203) {

			if (RTPSession.rtpDebugLevel > 2) {

				System.out

						.println(" <-> RtcpPktBYE.parseHeaders() etc. problem");

			}

			super.problem = -203;

		} else {

			ssrcArray = new long[super.itemCount];

			for (int i = 0; i < super.itemCount; i++) {

				ssrcArray[i] = StaticProcs.bytesToUIntLong(aRawPkt, start

						+ (i + 1) * 4);

			}

			if (super.length > (super.itemCount + 1)) {

				int reasonLength = (int) aRawPkt[start + (super.itemCount + 1)

						* 4];

				// System.out.println("super.itemCount:"+super.itemCount+" reasonLength:"+reasonLength+" start:"+(super.itemCount*4

				// + 4 + 1));

				reason = new byte[reasonLength];

				System.arraycopy(aRawPkt,

						start + (super.itemCount + 1) * 4 + 1, reason, 0,

						reasonLength);

				// System.out.println("test:" + new String(reason));

			}

		}

	}

	protected void encode() {

		itemCount = ssrcArray.length;

		length = 4 * ssrcArray.length;

		if (reason != null) {

			length += (reason.length + 1) / 4;

			if ((reason.length + 1) % 4 != 0) {

				length += 1;

			}

		}

		rawPkt = new byte[length * 4 + 4];

		int i;

		byte[] someBytes;

		// SSRCs

		for (i = 0; i < ssrcArray.length; i++) {

			someBytes = StaticProcs.uIntLongToByteWord(ssrcArray[i]);

			System.arraycopy(someBytes, 0, rawPkt, 4 + 4 * i, 4);

		}

		// Reason for leaving

		if (reason != null) {

			// System.out.println("Writing to:"+(4+4*ssrcArray.length)+

			// " reason.length:"+reason.length );

			rawPkt[(4 + 4 * ssrcArray.length)] = (byte) reason.length;

			System.arraycopy(reason, 0, rawPkt, 4 + 4 * i + 1, reason.length);

		}

		super.writeHeaders();

	}

	public void debugPrint() {

		System.out.println("RtcpPktBYE.debugPrint() ");

		if (ssrcArray != null) {

			for (int i = 0; i < ssrcArray.length; i++) {

				long anSsrc = ssrcArray[i];

				System.out.println("     ssrc: " + anSsrc);

			}

		}

		if (reason != null) {

			System.out.println("     Reason: " + new String(reason));

		}

	}

}