/// <summary>
/// 将字节数组解析出ssl record layer格式。V3_3
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
public static bool GetRecordLayerNetMQMessage(this byte[] bytes, ref bool changeCipherSpec, ref int offset, out List <NetMQMessage> sslMessages)
{
//用一个临时遍历保存偏移量，只有这个当前解析成功才偏移。
int tempOffset = offset;
if (bytes.Length - tempOffset < 5)
{
//长度至少要有5位
//ContentType (1,handshake:22)
//ProtocolVersion(2)
//握手协议长度：(2)
//握手协议数据
sslMessages = null;
return(false);
}
NetMQMessage sslMessage = new NetMQMessage();
byte[] contentTypeBytes = new byte[Constants.CONTENT_TYPE_LENGTH];
//get content type
Buffer.BlockCopy(bytes, tempOffset, contentTypeBytes, 0, Constants.CONTENT_TYPE_LENGTH);
tempOffset += Constants.CONTENT_TYPE_LENGTH;
byte[] protocolVersionBytes = new byte[Constants.PROTOCOL_VERSION_LENGTH];
//get protocol version
Buffer.BlockCopy(bytes, tempOffset, protocolVersionBytes, 0, Constants.PROTOCOL_VERSION_LENGTH);
tempOffset += Constants.PROTOCOL_VERSION_LENGTH;
byte[] handshakeLengthBytes = new byte[Constants.HAND_SHAKE_LENGTH];
//get hand shake layer
//0012->1200->2100
Buffer.BlockCopy(bytes, tempOffset, handshakeLengthBytes, 0, Constants.HAND_SHAKE_LENGTH);
tempOffset += Constants.HAND_SHAKE_LENGTH;
//交换2个字节位置。
byte[] temp = new byte[2];
temp[1] = handshakeLengthBytes[0];
temp[0] = handshakeLengthBytes[1];
//由于生成长度是BitConverter.GetBytes是Little-Endian,因此需要转换为Big-Endian。
//在解析长度时需要转回来。
//一定要4位才行
int length = BitConverter.ToUInt16(temp, 0);
//解析handshake长度
if (tempOffset + length > bytes.Length)
{
sslMessages = null;
//接收到的数据长度不够，可能发送拆包。等后续包过来。
return(false);
}
sslMessage.Append(contentTypeBytes);
sslMessage.Append(protocolVersionBytes);
sslMessage.Append(handshakeLengthBytes);
//解析handShakeLayer或applicationdata
sslMessages = GetRecordLayers((ContentType)contentTypeBytes[0], bytes, tempOffset, tempOffset + length, ref changeCipherSpec);
tempOffset += length;
offset = tempOffset;
foreach (NetMQMessage record in sslMessages)
{
//每个record都添加头部
foreach (NetMQFrame head in sslMessage.Reverse())//倒置，先插入后面的。
{
record.Push(head.Buffer);
}
}
return(true);
}
