Bend.SegmentBlockBasicDecoder._decodeRecordFromBlock C# (CSharp) Метод

        private static KeyValuePair<RecordKey, RecordUpdate> _decodeRecordFromBlock(BlockAccessor rs)
        {
            // ..we are ASSUMING that the records starts right here in the stream, it better be true!
            // ..TODO: considering adding two separate record start/end markers

            // Accumulate the key.
            List<byte> keydata = new List<byte>();
            bool keydone = false;

            while (rs.Position < rs.Length && !keydone) {
                byte c = (byte)rs.ReadByte();
                switch (c) {
                    case SegmentBlockBasicEncoder.END_OF_LINE:   // end of line
                        throw new Exception("reached end of line before keyvalue delimiter");
                    case SegmentBlockBasicEncoder.KEY_VAL_SEP:   // key value delimiter
                        keydone = true;
                        break;
                    case SegmentBlockBasicEncoder.ESCAPE_CHAR:
                        byte nc = (byte)rs.ReadByte();
                        byte unescaped = (byte)(nc + (byte)SegmentBlockBasicEncoder.ESCAPE_OFFSET);
                        if (unescaped < SegmentBlockBasicEncoder.FIRST_SPECIAL || unescaped > SegmentBlockBasicEncoder.LAST_SPECIAL) {
                            throw new Exception("unhandled escape payload 1: " + ((int)nc).ToString());
                        }
                        keydata.Add(unescaped);
                        break;
                    default:
                        keydata.Add(c);
                        break;
                }
            }
            if (!keydone) { throw new Exception("reached end of buffer before keydone!"); }
            // accumulate the value
            List<byte> valuedata = new List<byte>();
            bool valuedone = false;
            while (rs.Position < rs.Length && !valuedone) {
                byte c = (byte)rs.ReadByte();
                switch (c) {
                    case SegmentBlockBasicEncoder.END_OF_LINE:   // end of line
                        valuedone = true;
                        break;
                    case SegmentBlockBasicEncoder.KEY_VAL_SEP:   // key value delimiter
                        throw new Exception("found keyvalue delimiter in value");
                    case SegmentBlockBasicEncoder.ESCAPE_CHAR:
                        byte nc = (byte)rs.ReadByte();
                        byte unescaped = (byte)(nc + SegmentBlockBasicEncoder.ESCAPE_OFFSET);
                        if (unescaped < SegmentBlockBasicEncoder.FIRST_SPECIAL || unescaped > SegmentBlockBasicEncoder.LAST_SPECIAL) {
                            throw new Exception("unhandled escape sequence 2: " + unescaped.ToString());
                        }
                        valuedata.Add(unescaped);
                        break;
                    default:
                        valuedata.Add(c);
                        break;
                }
            }

            if (valuedone != true) {
                throw new Exception("SegmentBlockBasicDecoder: finished record without reaching END_OF_LINE");
            }

            RecordKey key = new RecordKey(keydata.ToArray());
            RecordUpdate value = RecordUpdate.FromEncodedData(valuedata.ToArray());
            // Debug.WriteLine("scanning " + key.ToString() + " : " + value.ToString());
            return new KeyValuePair<RecordKey, RecordUpdate>(key, value);
        }