Eliminate some gratuitous exceptions

libaegisub/common/charset.cpp

@@ -98,12 +98,9 @@ public:
 				break;
 
 			default:
-				throw UnknownCharset("Unknown character set.");
+				return;
 			}
 
-			if (list.empty() && (mInputState == eHighbyte))
-				throw UnknownCharset("Unknown character set.");
-
 			typedef std::pair<float, std::string> const& result;
 			sort(begin(list), end(list), [](result lft, result rgt) { return lft.first > rgt.first; });
 		}

libaegisub/include/libaegisub/charset.h

@@ -26,9 +26,6 @@ namespace agi {
 	/// Character set conversion and detection.
 	namespace charset {
 
-DEFINE_EXCEPTION(CharsetError, agi::Exception);
-DEFINE_EXCEPTION(UnknownCharset, CharsetError);
-
 /// List of detected encodings.
 typedef std::vector<std::pair<float, std::string>> CharsetListDetected;
 

src/audio_player_dsound2.cpp

@@ -124,14 +124,14 @@ struct COMInitialization {
 	}
 
 	/// @brief Initialise the COM library as single-threaded apartment if isn't already inited by us
-	void Init()
+	bool Init()
 	{
 		if (!inited)
 		{
-			if (FAILED(CoInitialize(nullptr)))
-				throw std::exception();
-			inited = true;
+			if (SUCCEEDED(CoInitialize(nullptr)))
+				inited = true;
 		}
+		return inited;
 	}
 };
 
@@ -302,8 +302,7 @@ unsigned int __stdcall DirectSoundPlayer2Thread::ThreadProc(void *parameter)
 void DirectSoundPlayer2Thread::Run()
 {
 	COMInitialization COM_library;
-	try	{ COM_library.Init(); }
-	catch (std::exception e)
+	if (!COM_library.Init())
 		REPORT_ERROR("Could not initialise COM")
 
 	// Create DirectSound object

src/charset_detect.cpp

@@ -49,13 +49,7 @@
 namespace CharSetDetect {
 
 std::string GetEncoding(agi::fs::path const& filename) {
-	agi::charset::CharsetListDetected list;
-
-	try {
-		list = agi::charset::DetectAll(filename);
-	} catch (const agi::charset::UnknownCharset&) {
-		// will be set to the full list of charsets below
-	}
+	auto list = agi::charset::DetectAll(filename);
 
 	if (list.size() == 1) {
 		auto charset = list.begin();