/// <summary>
/// Parses the next <see cref="BList"/> from the stream.
/// </summary>
/// <param name="stream">The stream to parse from.</param>
/// <returns>The parsed <see cref="BList"/>.</returns>
/// <exception cref="InvalidBencodeException{BList}">Invalid bencode</exception>
protected BList ParseList(BencodeStream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (stream.Length < MinimumListLength)
{
throw InvalidBencodeException <BList> .BelowMinimumLength(MinimumListLength, stream.Length, stream.Position);
}
// Lists must start with 'l'
char c = stream.ReadChar();
if (c != 'l')
{
throw InvalidBencodeException <BList> .UnexpectedChar('l', c, stream.Position);
}
var list = new BList();
// Loop until next character is the end character 'e' or end of stream
while (stream.Peek() != 'e' && stream.Peek() != -1)
{
// Decode next object in stream
var bObject = Parse(stream);
list.Add(bObject);
}
c = stream.ReadChar();
if (c != 'e')
{
if (stream.EndOfStream)
{
throw InvalidBencodeException <BList> .MissingEndChar();
}
throw InvalidBencodeException <BList> .InvalidEndChar(c, stream.Position);
}
return(list);
}
/// <summary>
/// Parses the next <see cref="BDictionary"/> from the stream and its contained keys and values.
/// </summary>
/// <param name="stream">The stream to parse from.</param>
/// <returns>The parsed <see cref="BDictionary"/>.</returns>
/// <exception cref="InvalidBencodeException{BDictionary}">Invalid bencode</exception>
protected BDictionary ParseDict(BencodeStream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
var startPosition = stream.Position;
if (stream.Length < MinimumDictLength)
{
throw InvalidBencodeException <BDictionary> .BelowMinimumLength(MinimumDictLength, stream.Length, startPosition);
}
// Dictionaries must start with 'd'
char c = stream.ReadChar();
if (c != 'd')
{
throw InvalidBencodeException <BDictionary> .UnexpectedChar('d', c, startPosition);
}
var dictionary = new BDictionary();
// Loop until next character is the end character 'e' or end of stream
while (stream.Peek() != 'e' && stream.Peek() != -1)
{
BString key;
try {
// Decode next string in stream as the key
key = ParseStr(stream);
} catch (BencodeException <BString> ex) {
throw InvalidDictException("Could not parse dictionary key. Keys must be strings.", ex, startPosition);
}
IBObject value;
try {
// Decode next object in stream as the value
value = Parse(stream);
} catch (BencodeException ex) {
throw InvalidDictException(
string.Format("Could not parse dictionary value for the key '{0}'. There needs to be a value for each key.", key),
ex, startPosition);
}
if (dictionary.ContainsKey(key))
{
throw InvalidDictException(
string.Format("The dictionary already contains the key '{0}'. Duplicate keys are not supported.", key), startPosition);
}
dictionary.Add(key, value);
}
c = stream.ReadChar();
if (c != 'e')
{
if (stream.EndOfStream)
{
throw InvalidBencodeException <BDictionary> .MissingEndChar();
}
throw InvalidBencodeException <BDictionary> .InvalidEndChar(c, stream.Position);
}
return(dictionary);
}