added per file progress, added patch suggested by Tianhao Qui regarding unchoking when a peer becomes uninterested. Updated documentation and removed block quotes around bullet lists.

src/peer_connection.cpp

@@ -315,7 +315,7 @@ namespace libtorrent
 
 	peer_connection::~peer_connection()
 	{
-		INVARIANT_CHECK;
+//		INVARIANT_CHECK;
 
 #ifdef TORRENT_VERBOSE_LOGGING
 		using namespace boost::posix_time;

src/policy.cpp

@@ -1120,6 +1120,9 @@ namespace libtorrent
 		{
 			c.send_choke();
 			--m_num_unchoked;
+
+			if (m_torrent->is_seed()) seed_unchoke_one_peer();
+			else unchoke_one_peer();
 		}
 	}
 

src/torrent.cpp

@@ -1645,6 +1645,32 @@ namespace libtorrent
 		assert(!m_metadata.empty());
 		return m_metadata;
 	}
+
+	void torrent::file_progress(std::vector<float>& fp) const
+	{
+		assert(valid_metadata());
+	
+		fp.clear();
+		fp.resize(m_torrent_file.num_files(), 0.f);
+		
+		for (int i = 0; i < m_torrent_file.num_files(); ++i)
+		{
+			peer_request ret = m_torrent_file.map_file(i, 0, m_torrent_file.file_at(i).size);
+			size_type done = 0;
+			while (ret.length > 0)
+			{
+				size_type bytes_step = std::min(m_torrent_file.piece_size(ret.piece)
+					- ret.start, (size_type)ret.length);
+				if (m_have_pieces[ret.piece]) done += bytes_step;
+				++ret.piece;
+				ret.start = 0;
+				ret.length -= bytes_step;
+			}
+			assert(ret.length == 0);
+			
+			fp[i] = static_cast<float>(done) / m_torrent_file.file_at(i).size;
+		}
+	}
 	
 	torrent_status torrent::status() const
 	{

src/torrent_handle.cpp

@@ -243,6 +243,39 @@ namespace libtorrent
 			, bind(&torrent::set_tracker_login, _1, name, password));
 	}
 
+	void torrent_handle::file_progress(std::vector<float>& progress)
+	{
+		INVARIANT_CHECK;
+		
+		if (m_ses == 0) throw_invalid_handle();
+
+		if (m_chk)
+		{
+			mutex::scoped_lock l(m_chk->m_mutex);
+
+			detail::piece_checker_data* d = m_chk->find_torrent(m_info_hash);
+			if (d != 0)
+			{
+				if (!d->processing)
+				{
+					torrent_info const& info = d->torrent_ptr->torrent_file();
+					progress.clear();
+					progress.resize(info.num_files(), 0.f);
+					return;
+				}
+				d->torrent_ptr->file_progress(progress);
+				return;
+			}
+		}
+
+		{
+			session_impl::mutex_t::scoped_lock l(m_ses->m_mutex);
+			boost::shared_ptr<torrent> t = m_ses->find_torrent(m_info_hash).lock();
+			if (t) return t->file_progress(progress);
+		}
+
+		throw_invalid_handle();
+	}
 
 	torrent_status torrent_handle::status() const
 	{