private static Task <BString> ReadStringAsync(PeekableReader reader)
{
var lengthBuilder = new StringBuilder();
while (reader.PeekByte() != ':')
{
lengthBuilder.Append((char)reader.ReadByte());
}
Expect(reader, ':');
var length = Convert.ToInt32(lengthBuilder.ToString());
var buffer = new byte[length];
for (var i = 0; i < length; i++)
{
var b = reader.ReadByte();
if (b < 0)
{
throw new Exception("Unexpected end of stream");
}
buffer[i] = (byte)b;
}
return(Task.FromResult(new BString(buffer)));
}
private static void Expect(PeekableReader reader, char expectedChar)
{
var foundChar = reader.ReadByte();
if (foundChar < 0)
{
throw new Exception("Unexpected end of stream");
}
if (foundChar != expectedChar)
{
throw new Exception("Unexpected character: " + foundChar);
}
}
private static Task <BNumber> ReadNumberAsync(PeekableReader reader)
{
Expect(reader, 'i');
var builder = new StringBuilder();
while (reader.PeekByte() != 'e')
{
builder.Append((char)reader.ReadByte());
}
Expect(reader, 'e');
var num = Convert.ToInt64(builder.ToString());
return(Task.FromResult(new BNumber(num)));
}