代码实现:在字节数组中查找16进制字节序列(C#)

近日在工作中需要在字节数组中查找某个16进制字节序列,没找到现成的,只好自己写了一个,不管效率如何,只要自己用着
顺手就好 :)

代码如下:

        //在buffer中查找16进制字节序列key，找到返回1，未找到返回0
        public int SearchByte(byte[] buffer, byte[] key, int startPos, ref int pos)
        {
            int i = startPos;
            int tem_pos = 0;
            bool found1 = false;
            int found2 = 0;

            do
            {
                for (int j = 0; j < key.Length; j++)
                {
                    if (buffer[i] == key[j])
                    {
                        if (j == 0)
                        {
                            found1 = true;
                            tem_pos = i;
                        }
                        else
                            found2 = 1;
                        i = i + 1;
                    }
                    else
                    {
                        if (j == 0)
                            found1 = false;
                        else
                            found2 = 2;

                    }

                    if (found1 == false)
                    {
                        i = i + 1;
                        break;
                    }

                    if ((found2 == 2))
                    {
                        i = i - j + 1;
                        found1 = false;
                        found2 = 0;
                        break;
                    }

                    if ((found1 == true) && (found2 == 1) && (j == (key.Length - 1))) //匹配上了
                    {
                        pos = i - (key.Length);
                        return 1;
                    }
                }

            }
            while (i < buffer.Length);

            return 0;
        }

 

用法:

  int startPos =0;
  int endPos = 0;
  byte[] bHead = new byte[3];
  bHead[0] = 0xA0;
  bHead[1] = 0xA6;
  bHead[2] = 0xB8;
 

  if ( 1 == SearchByte(readBuffer, bHead, startPos, ref endPos))
   {

       //the endPos value 就是bHead在readBuffer中的位置

 

   }