bandwidth management fix + improved string conversion fallback in case strings are incorrect in torrent

include/libtorrent/torrent.hpp

@@ -207,6 +207,8 @@ namespace libtorrent
 		void expire_bandwidth(int channel, int amount);
 		void assign_bandwidth(int channel, int amount);
 		
+		int bandwidth_throttle(int channel) const;
+
 // --------------------------------------------
 		// PEER MANAGEMENT
 		

src/bandwidth_manager.cpp

@@ -218,6 +218,10 @@ namespace libtorrent
 				t->expire_bandwidth(m_channel, -1);
 				continue;
 			}
+			// don't hand out chunks larger than the throttle
+			// per second on the torrent
+			if (max_assignable > t->bandwidth_throttle(m_channel))
+				max_assignable = t->bandwidth_throttle(m_channel);
 
 			// so, hand out max_assignable, but no more than
 			// the available bandwidth (amount) and no more

src/storage.cpp

@@ -91,11 +91,13 @@ namespace libtorrent
 		catch (std::exception)
 		{
 			std::wstring ret;
-			for (const char* i = &s[0]; i < &s[0] + s.size(); ++i)
+			const char* end = &s[0] + s.size();
+			for (const char* i = &s[0]; i < end;)
 			{
-				wchar_t c;
-				c = '.';
-				std::mbtowc(&c, i, 1);
+				wchar_t c = '.';
+				int result = std::mbtowc(&c, i, end - i);
+				if (result > 0) i += result;
+				else ++i;
 				ret += c;
 			}
 			return ret;

src/torrent.cpp

@@ -1861,7 +1861,12 @@ namespace libtorrent
 		int max_assignable = m_bandwidth_limit[channel].max_assignable();
 		return max_assignable > max_bandwidth_block_size
 			|| (m_bandwidth_limit[channel].throttle() < max_bandwidth_block_size
-				&& max_assignable > 0);
+				&& max_assignable == m_bandwidth_limit[channel].throttle());
+	}
+
+	int torrent::bandwidth_throttle(int channel) const
+	{
+		return m_bandwidth_limit[channel].throttle();
 	}
 
 	void torrent::request_bandwidth(int channel