public static Utf8BEncodingReader GetReader(string bencoded)
{
byte[] bencodedBytes = Encoding.UTF8.GetBytes(bencoded);
var reader = new Utf8BEncodingReader(bencodedBytes);
Assert.Equal(BEncodingTokenType.None, reader.TokenType);
return(reader);
}
public static bool TryParse(ReadOnlySpan <byte> data, out ReadOnlySpan <byte> utf8value)
{
var reader = new Utf8BEncodingReader(data);
if (reader.Read() &&
reader.TokenType == BEncodingTokenType.String &&
reader.IsEmpty)
{
utf8value = reader.ValueSpan;
return(true);
}
utf8value = default;
return(false);
}
public static bool TryParse(ReadOnlySpan <byte> data, out string value)
{
var reader = new Utf8BEncodingReader(data);
if (reader.Read() &&
reader.TokenType == BEncodingTokenType.String &&
reader.IsEmpty &&
reader.TryGet(out value))
{
return(true);
}
value = null;
return(false);
}
public static bool TryParse(ReadOnlySpan <byte> data, out BigInteger value)
{
var reader = new Utf8BEncodingReader(data);
if (reader.Read() &&
reader.TokenType == BEncodingTokenType.Integer &&
reader.IsEmpty &&
reader.TryGet(out value))
{
return(true);
}
value = BigInteger.Zero;
return(false);
}
public static bool TryParse(ReadOnlySpan <byte> data, out IBObject bObject, bool strictDictionaryOrder = true)
{
var reader = new Utf8BEncodingReader(data);
List <IBObject> stack = null;
bObject = null;
BString key = null;
while (reader.Read())
{
IBObject value;
switch (reader.TokenType)
{
case BEncodingTokenType.String:
value = new BString(reader.ValueSpan);
break;
case BEncodingTokenType.Integer:
if (!reader.TryGet(out BigInteger integer))
{
return(false);
}
value = new BInteger(integer);
break;
case BEncodingTokenType.End:
if (stack is null || !(key is null))
{
return(false);
}
stack[stack.Count - 1].SpanEnd = reader.Consumed;
if (stack.Count == 1)
{
return(reader.IsEmpty);
}
Debug.Assert(stack.Count != 0);
stack.RemoveAt(stack.Count - 1);
continue;
default:
Debug.Assert(reader.TokenType == BEncodingTokenType.StartDictionary || reader.TokenType == BEncodingTokenType.StartList);
value = reader.TokenType == BEncodingTokenType.StartDictionary
? (IBObject) new BDictionary()
: (IBObject) new BList();
if (stack is null)
{
Debug.Assert(key is null);
stack = new List <IBObject>(4);
bObject = value;
stack.Add(bObject);
continue;
}
else
{
if (stack.Count == BEncodingConstants.DepthMax)
{
return(false);
}
break;
}
}
if (stack is null)
{
Debug.Assert(bObject is null && key is null);
Debug.Assert(reader.TokenType != BEncodingTokenType.StartDictionary);
Debug.Assert(reader.TokenType != BEncodingTokenType.StartList);
bObject = value;
return(reader.IsEmpty);
}
if (stack.Count == 0)
{
return(false);
}
var top = stack[^ 1];
