/// <summary>
/// 接收数据小块,进行解码和检查工作
/// </summary>
/// <param name="inBytes"></param>
public void Receive(byte[] inBytes)
{
bool isReverse = false;
byte preamble = PREAMBLE_VALUE;
if (isReverse)//这句话的作用是啥？
{
inBytes = ByteSequence.Inverse(inBytes);
preamble = REVERSE_PREAMBLE_VALUE;
}
//1）转换成二进制字符串,该数据在各个过程中将被改变
ByteSequence.EnQuence(inBytes);
//拼接上一过程留下的数据
InsertAndEmpytyPreRemainedData();
while (this.DataAquirement.ByteCount <= ByteSequence.Count)
{
var InputBytes = ByteSequence.DeQueue(this.DataAquirement.ByteCount);
switch (this.DataAquirement.PositionState)
{
case DataPositionState.FindingPreamble:
int index = -1;
for (int i = 0; i < InputBytes.Count; i++)
{
if (InputBytes[i] == preamble)
{
index = i;
break;
}
}
//1.1 没有找到，则返回后7位作为下一字符的开头，继续搜索
if (index == -1)
{
this.PrevRemainedBytes = null;
}
//1.2 找到了，则解析，并转入下一个过程
else
{
this.CurrentFrame = new Rtcm3Frame(preamble); //说明是新开始的头部
//如果后继字节不够，则重新来过
if (InputBytes.Count < index + 3)
{
//处理完一个帧啦，下一步进行第二帧处理
this.PrevRemainedBytes = InputBytes.GetRange(index, InputBytes.Count - index);
this.DataAquirement.PositionState = DataPositionState.FindingPreamble;
this.DataAquirement.ByteCount = 30;//一次预读取字符数量 bre
break;
}
ProcessPresamble(InputBytes, index);
}
break;
case DataPositionState.ParsingContentData: //5）已经找到了报文头部，接下来进行处理
this.CurrentFrame.AddContent(InputBytes);
this.DataAquirement.PositionState = Rtcm.DataPositionState.CheckingCrc;
this.DataAquirement.ByteCount = 3;//一次预读取字符数量
break;
case DataPositionState.CheckingCrc:
CheckCrs(isReverse, InputBytes);
break;
default: break;
}
InsertAndEmpytyPreRemainedData();
}
}
