System.IO.Ports.SerialPortBase.BufferIndexOf C# (CSharp) Méthode

        protected virtual int BufferIndexOf(byte[] what)
        {
            // The same limitations about searching for bytes applies. See ReadTo comments for details.

            int whatLength = what.Length;
            int bufferLength = _incomingBuffer.Length;

            // buffer should not be modified during this method (ie. call in lock(_bufferSync) only)

            if (whatLength > _incomingBufferValidLength) return -1;  // if the desired sequence would not fit into the buffer at all, do not bother searching it

            for (int i = _incomingBufferPosition; i < _incomingBufferPosition + _incomingBufferValidLength; i++)
                if (_incomingBuffer[i % bufferLength] == what[0])
                {                                                                       // we have a first byte match
                    int j;
                    for (j = 1; j < whatLength; j++)
                        if (_incomingBuffer[(i + j) % bufferLength] != what[j]) break;  // check the remaining bytes

                    if (j >= whatLength)                                                // If the remaining bytes match,
                        return (i - _incomingBufferPosition) % bufferLength;            // decode the circular position and return it;
                }                                                                       // else try the next byte.

            return -1;
        }