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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * 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 com.generallycloud.baseio.codec.http11;

import java.io.IOException;

import com.generallycloud.baseio.buffer.ByteBuf;
import com.generallycloud.baseio.codec.http11.future.WebSocketReadFutureImpl;
import com.generallycloud.baseio.component.SocketSession;
import com.generallycloud.baseio.protocol.ChannelReadFuture;
import com.generallycloud.baseio.protocol.ProtocolDecoder;

//FIXME 心跳貌似由服务端发起
/**
 *  * 
 *       0               1               2               3
 *       0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
 *      +-+-+-+-+-------+-+-------------+-------------------------------+
 *      |F|R|R|R| opcode|M| Payload len |    Extended payload length    |
 *      |I|S|S|S|  (4)  |A|     (7)     |             (16/64)           |
 *      |N|V|V|V|       |S|             |   (if payload len==126/127)   |
 *      | |1|2|3|       |K|             |                               |
 *      +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
 *      |     Extended payload length continued, if payload len == 127  |
 *      + - - - - - - - - - - - - - - - +-------------------------------+
 *      |                               |Masking-key, if MASK set to 1  |
 *      +-------------------------------+-------------------------------+
 *      | Masking-key (continued)       |          Payload Data         |
 *      +-------------------------------- - - - - - - - - - - - - - - - +
 *      :                     Payload Data continued ...                :
 *      + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
 *      |                     Payload Data continued ...                |
 *      +---------------------------------------------------------------+
 * 
 * 
 * 
 *
 */
public class WebSocketProtocolDecoder implements ProtocolDecoder {

	public static final int	PROTOCOL_HEADER	= 2;

	public static final int	TYPE_TEXT		= 1;
	public static final int	TYPE_BINARY		= 2;
	public static final int	TYPE_CLOSE		= 8;
	public static final int	TYPE_PING		= 9;
	public static final int	TYPE_PONG		= 10;

	private int			limit;

	public WebSocketProtocolDecoder(int limit) {
		this.limit = limit;
	}

	@Override
	public ChannelReadFuture decode(SocketSession session, ByteBuf buffer) throws IOException {

		return new WebSocketReadFutureImpl(session, session.getByteBufAllocator().allocate(PROTOCOL_HEADER), limit);
	}

}