MonoTorrent

h1. Save/Load Fast Resume

This is used so that a full hash check does not have to be performed the first time a torrent is started. Normally all the data for a torrent would be passed through a SHA1 hasher so that data integrity can be verified. With fast resume you can skip this step.

<pre><code class="java">

		public void SaveFastResume (List <TorrentManager> managers)

		{

			// Store the fast resume for each torrent in a list,

			// then serialise the list to the disk.

			BEncodedList list = new BEncodedList ();

			foreach (TorrentManager manager in managers) {

				// Get the fast resume data for the torrent

				FastResume data = manager.SaveFastResume ();

				// Encode the FastResume data to a BEncodedDictionary.

				BEncodedDictionary fastResume = data.Encode ();

				// Add the FastResume dictionary to the main dictionary using

				// the torrents infohash as the key

				list.Add (data);

			}

			// Write all the fast resume data to disk

			File.WriteAllBytes (fastResumePath, list.Encode ());

		}

		public void LoadFastResume (List <TorrentManager> managers)

		{

			// Read the main dictionary from disk and iterate through

			// all the fast resume items

			BEncodedList list = (BEncodedList) BEncodedValue.Decode (File.ReadAllBytes (fastResumePath));

			foreach (BEncodedDictionary fastResume in list) {

				// Decode the FastResume data from the BEncodedDictionary

				FastResume data = new FastResume (fastResume);

				// Find the torrentmanager that the fastresume belongs to

				// and then load it

				foreach (TorrentManager manager in managers)

					if (manager.InfoHash == data.Infohash)

						manager.LoadFastResume (data);

			}

		}

</code></pre>