public static object DecodeObject(DataIndex data)
{
var currentChar = data.GetNext();
switch (currentChar)
{
case control_char_dictionary_start:
return DecodeDictionary(data);
case control_char_list_start:
return DecodeList(data);
case control_char_long_start:
return DecodeLong(data);
default:
int n;
// Check for final case: a number, which represents a length of bytes.
if (!int.TryParse(Encoding.UTF8.GetString(new[] { currentChar }), out n))
throw new BEncodeException("Invalid control character.");
data.Index--; // This is a special circumstance that requires the "control" character to be parsed.
return DecodeString(data);
}
}
private static byte[] DecodeString(DataIndex data)
{
var length = (int) DecodeLong(data, control_char_string_split);
return data.GetBytes(length);
}
private static void DecodeLoop(DataIndex data, byte endByte, Action action)
{
while (data.Get() != endByte)
{
action();
}
data.Index++;
}
private static long DecodeLong(DataIndex data, byte endByte = control_char_long_end)
{
var numberString = Encoding.UTF8.GetString(data.GetBytesUntil(endByte));
return Convert.ToInt64(numberString);
}
private static List<object> DecodeList(DataIndex data)
{
var list = new List<object>();
DecodeLoop(data, control_char_list_end, () => list.Add(DecodeObject(data)));
return list;
}
private static Dictionary<string, object> DecodeDictionary(DataIndex data)
{
var dictionary = new Dictionary<string, object>();
DecodeLoop(data, control_char_dictionary_end, () => dictionary.Add(Encoding.UTF8.GetString(DecodeString(data)), DecodeObject(data)));
return dictionary;
}