public override void ParseBytes(byte[] bytes)
{
int startIndex = 0;
// 消息类型
this.FrameType = (SaiFrameType)bytes[startIndex++];
// 序列号
this.SequenceNo = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += 2;
// Padding
startIndex += SaiFrame.TtsPaddingLength;
// 初始值
this.InitialValue = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// 版本
this.Version = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// EC周期
this.Interval = RsspEncoding.ToHostUInt16(bytes, startIndex);
}
public override void ParseBytes(byte[] bytes)
{
int startIndex = 0;
// 消息类型
this.FrameType = (SaiFrameType)bytes[startIndex++];
// 序列号
this.SequenceNo = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += 2;
// sender timestamp
this.SenderTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// Responsor last timestamp
this.ReceiverLastSendTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// sender last timestamp
this.SenderLastRecvTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// user data
var len = bytes.Length - startIndex;
if (len > 0)
{
this.UserData = new byte[len];
Array.Copy(bytes, startIndex, this.UserData, 0, len);
}
}
public override void ParseBytes(byte[] bytes)
{
int startIndex = 0;
// 消息类型
this.FrameType = (SaiFrameType)bytes[startIndex++];
// 序列号
this.SequenceNo = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += 2;
// Padding
startIndex += SaiFrame.TtsPaddingLength;
// EC计数
this.EcValue = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// user data
var len = bytes.Length - startIndex;
if (len > 0)
{
this.UserData = new byte[len];
Array.Copy(bytes, startIndex, this.UserData, 0, len);
}
}
public override void ParseBytes(byte[] bytes)
{
int startIndex = 0;
// 消息类型
this.FrameType = (SaiFrameType)bytes[startIndex++];
// 序列号
this.SequenceNo = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += 2;
// sender timestamp
this.SenderTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// Responsor last timestamp
this.ReceiverLastSendTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// sender last timestamp
this.SenderLastRecvTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// valid
this.Valid = (bytes[startIndex++] == 1);
}
private ushort GetPacketLength(byte[] buffer, int startIndex)
{
if ((buffer == null) || (buffer.Length - startIndex < 2))
{
return(0);
}
return(RsspEncoding.ToHostUInt16(buffer, startIndex));
}
/// <summary>
/// 解析指定的字节流。
/// </summary>
public void ParseBytes(byte[] bytes)
{
if (bytes == null || bytes.Length < AleFrame.HeadLength)
{
throw new AleFrameParsingException("无法将指定的字节流解析为AleFrame，长度不够。");
}
int startIndex = 0;
// 包长度
var pktLen = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += AleFrame.SizeofHeadLen;
// 版本
this.Version = bytes[startIndex++];
// 应用类型
this.ApplicationType = bytes[startIndex++];
// 传输序列号
this.SequenceNo = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += 2;
// N/R标志
this.IsNormal = (bytes[startIndex++] == 1);
// 包类型
this.FrameType = (AleFrameType)bytes[startIndex++];
// 校验和
if (this.FrameType != AleFrameType.KAA && this.FrameType != AleFrameType.KANA) // 生命信息不需要校验
{
//var actualCrcValue = BitConverter.ToUInt16(bytes, startIndex);
var actualCrcValue = RsspEncoding.ToHostUInt16(bytes, startIndex);
var expectedCrcValue = CrcTool.CaculateCCITT16(bytes, 0, 8);
if (actualCrcValue != expectedCrcValue)
{
throw new AleFrameParsingException(string.Format("解析Ale协议帧时发生异常，CRC检验不一致，期望值是{0}，实际值是{1}。",
expectedCrcValue, actualCrcValue));
}
}
startIndex += 2;
// 用户数据
var userDataLen = pktLen - (AleFrame.HeadLength - AleFrame.SizeofHeadLen);
if (userDataLen < 0)
{
throw new AleFrameParsingException(string.Format("将字节流解析为ALE帧时发生异常，用户数据长度为负值{0}。", userDataLen));
}
this.UserData = AleUserData.Parse(this.FrameType, bytes, startIndex, startIndex + userDataLen - 1);
}
public override void ParseBytes(byte[] bytes)
{
int startIndex = 0;
// 消息类型
this.FrameType = (SaiFrameType)bytes[startIndex++];
// 序列号
this.SequenceNo = RsspEncoding.ToHostUInt16(bytes, startIndex);
startIndex += 2;
// sender timestamp
this.SenderTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// Responsor last timestamp
this.ReceiverLastSendTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// sender last timestamp
this.SenderLastRecvTimestamp = RsspEncoding.ToHostUInt32(bytes, startIndex);
startIndex += 4;
// 偏移标志
bool negative = (bytes[startIndex] == 1);
startIndex++;
// |最小偏移值|
this.OffsetMin = RsspEncoding.ToHostUInt32(bytes, startIndex);
if (negative)
{
this.OffsetMin = -this.OffsetMin;
}
startIndex += 4;
// 偏移标志
negative = (bytes[startIndex] == 1);
startIndex++;
// |最大偏移值|
this.OffsetMax = RsspEncoding.ToHostUInt32(bytes, startIndex);
if (negative)
{
this.OffsetMax = -this.OffsetMax;
}
startIndex += 4;
}
