internal static IBencodingType Decode(BinaryReader inputStream, ref int bytesConsumed)
{
char next = (char)inputStream.PeekChar();
switch (next)
{
case 'i':
// Integer
return(BInt.Decode(inputStream, ref bytesConsumed));
case 'l':
// List
return(BList.Decode(inputStream, ref bytesConsumed));
case 'd':
// List
return(BDict.Decode(inputStream, ref bytesConsumed));
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
// String
return(BString.Decode(inputStream, ref bytesConsumed));
}
return(null);
}
/// <summary>
/// Decode the next token as a dictionary.
/// Assumes the next token is a dictionary.
/// </summary>
/// <param name="inputStream"></param>
/// <param name="bytesConsumed"></param>
/// <returns>Decoded dictionary</returns>
public static BDict Decode(BinaryReader inputStream, ref int bytesConsumed)
{
// Get past 'd'
inputStream.ReadByte();
bytesConsumed++;
BDict res = new BDict();
// Read elements till an 'e'
while (inputStream.PeekChar() != 'e')
{
// Key
BString key = BString.Decode(inputStream, ref bytesConsumed);
// Value
IBencodingType value = BencodingUtils.Decode(inputStream, ref bytesConsumed);
res[key.Value] = value;
}
// Get past 'e'
inputStream.Read();
bytesConsumed++;
return(res);
}
/// <summary>
/// Calculates the InfoHash from a torrent. You must supply the "info" dictionary from the torrent.
/// </summary>
/// <param name="torrentInfoDict">The "info" dictionary.</param>
/// <example>
/// This example, will load a torrent, take the "info" dictionary out of the root dictionary and hash this.
/// <code>
/// BDict torrent = BencodingUtils.DecodeFile(@"torrentFile.torrent") as BDict;
/// byte[] infoHash = BencodingUtils.CalculateTorrentInfoHash(torrent["info"] as BDict);
/// </code>
///
/// The "infoHash" byte array now contains 20 bytes with the SHA-1 infoHash.
/// </example>
/// <returns></returns>
public static byte[] CalculateTorrentInfoHash(BDict torrentInfoDict)
{
// Take the "info" dictionary provided, and encode it
byte[] infoBytes = EncodeBytes(torrentInfoDict);
// Hash the encoded dictionary
return(new SHA1CryptoServiceProvider().ComputeHash(infoBytes));
}
public bool Equals(BDict obj)
{
Dictionary <string, IBencodingType> other = obj;
return(Equals(other));
}
public override bool Equals(object obj)
{
BDict other = obj as BDict;
return(Equals(other));
}
