AMPSExcel.FIXMessageType.PopulateDictionary C# (CSharp) Method

        public void PopulateDictionary(byte[] data, int position, int length, IDictionary<string,object> output)
        {
            // We need a simple state machine so we know how to handle
            // embedded '=' in the value.
            State state = State.Tag;
            int tagBegin = position;
            int tagLength = 0;
            int valueBegin = 0;
            for (int index = position; index < position + length; ++index )
            {
                if(data[index]==FieldSeparator && tagLength > 0)
                {
                    string tag = Encoding.ASCII.GetString(data, tagBegin, tagLength);
                    tagLength = 0;
                    string value = Encoding.UTF8.GetString(data, valueBegin, index - valueBegin);
                    output[tag] = value;
                    tagBegin = index+1;
                    tagLength = 0;
                    state = State.Tag;
                }
                else if(data[index]==TagValueSeparator && state == State.Tag)
                {
                    tagLength = index - tagBegin;
                    state = State.Value;
                    valueBegin = index + 1;
                }
            }
        }