/// <summary>
/// Decodes a BEncodedString from the supplied StreamReader
/// </summary>
/// <param name="reader">The StreamReader containing the BEncodedString</param>
internal override void DecodeInternal(RawReader reader)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
int letterCount;
string length = string.Empty;
while ((reader.PeekByte() != -1) && (reader.PeekByte() != ':')) // read in how many characters
{
length += (char)reader.ReadByte(); // the string is
}
if (reader.ReadByte() != ':') // remove the ':'
{
throw new BEncodingException("Invalid data found. Aborting");
}
if (!int.TryParse(length, out letterCount))
{
throw new BEncodingException(string.Format("Invalid BEncodedString. Length was '{0}' instead of a number", length));
}
this.textBytes = new byte[letterCount];
if (reader.Read(textBytes, 0, letterCount) != letterCount)
{
throw new BEncodingException("Couldn't decode string");
}
}
static BEncodedString DecodeString(RawReader reader, int length)
{
int read;
while ((read = reader.ReadByte()) != -1 && read != ':')
{
if (read < '0' || read > '9')
{
throw new BEncodingException($"Invalid BEncodedString. Length was '{length}' instead of a number");
}
length = length * 10 + (read - '0');
}
if (read != ':')
{
throw new BEncodingException("Invalid data found. Aborting");
}
var bytes = new byte[length];
if (reader.Read(bytes, 0, length) != length)
{
throw new BEncodingException("Couldn't decode string");
}
return(new BEncodedString(bytes));
}
public override void Decode(byte[] buffer, int offset, int length)
{
BEncodedValue val;
using (RawReader reader = new RawReader(new MemoryStream(buffer, offset, length, false), false))
{
BEncodedDictionary d = BEncodedDictionary.Decode<BEncodedDictionary>(reader);
int totalSize = 0;
if (d.TryGetValue(MessageTypeKey, out val))
messageType = (eMessageType)((BEncodedNumber)val).Number;
if (d.TryGetValue(PieceKey, out val))
piece = (int)((BEncodedNumber)val).Number;
if (d.TryGetValue(TotalSizeKey, out val))
{
totalSize = (int)((BEncodedNumber)val).Number;
metadata = new byte[Math.Min(totalSize - piece * BlockSize, BlockSize)];
reader.Read(metadata, 0, metadata.Length);
}
}
}