从NamedPipeClientStream移位

Question

I am currently trying to write a bit synchronous serial protocol that reads data through a NamedPipeClientStream. This data then needs to be continuously monitored for sync characters (Hex 22) that may or may not be on the byte boundaries and shift the data accordingly to ensure that the other data being received is in Frame.

I have prototyped several scenarios including a bit array and using a BitStream object designed by a person who posted to this site all of which seem cumbersome and most likely very inefficient.

The data being sent will continue to come in after the sync characters have been found so i must continue to add the incoming data to the end of the bit stream that was shifted.

Answer 1

Maybe something like this

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            StreamReader reader = new StreamReader("filename");
            UInt16 chr = (UInt16)reader.Read();
            UInt16 word = 0;
            int shift = -1;

            while (shift == -1)
            {
                word = (UInt16)((UInt16)(word << 8) | chr);
                shift = TestSync(chr, word);
            }
            while ((chr = (UInt16)reader.Read()) >= 0)
            {
                word = (UInt16)((UInt16)(word << 8) | chr);
                byte newChar = (byte)((word >> shift) & 0xff);

            }


        }
        static int TestSync(UInt16 chr, UInt16 word)
        {
            int results = -1;


            if((UInt16)(word & 0xff) == 0x11) return 0;
            if((UInt16)(word & 0xff) == 0x22) return 1; 
            if((UInt16)(word & 0xff) == 0x44) return 2;
            if((UInt16)(word & 0xff) == 0x88) return 3;
            if((UInt16)(word & 0x1fe) == 0x110) return 4;
            if((UInt16)(word & 0x3fc) == 0x220) return 5;
            if((UInt16)(word & 0x7f8) == 0x440) return 6;
            if ((UInt16)(word & 0xff0) == 0x880) return 7;

            return results;
        }
    }
}
​