| public static MagnetLink ( object magnetLink ) : void | ||
| magnetLink | object | |
| return | void | |
public static InfoHash FromMagnetLink(string magnetLink)
{
Check.MagnetLink(magnetLink);
if (!magnetLink.StartsWith("magnet:?"))
{
throw new ArgumentException("Invalid magnet link format");
}
magnetLink = magnetLink.Substring("magnet:?".Length);
var hashStart = magnetLink.IndexOf("xt=urn:btih:", StringComparison.Ordinal);
if (hashStart == -1)
{
throw new ArgumentException("Magnet link does not contain an infohash");
}
hashStart += "xt=urn:btih:".Length;
var hashEnd = magnetLink.IndexOf('&', hashStart);
if (hashEnd == -1)
{
hashEnd = magnetLink.Length;
}
switch (hashEnd - hashStart)
{
case 32:
return(FromBase32(magnetLink.Substring(hashStart, 32)));
case 40:
return(FromHex(magnetLink.Substring(hashStart, 40)));
default:
throw new ArgumentException("Infohash must be base32 or hex encoded.");
}
}
