input/InputStream: add `noexcept` to ReadTag()

src/decoder/Bridge.cxx

@@ -214,7 +214,7 @@ DecoderBridge::DoSendTag(const Tag &tag)
 }
 
 bool
-DecoderBridge::UpdateStreamTag(InputStream *is)
+DecoderBridge::UpdateStreamTag(InputStream *is) noexcept
 {
 	auto tag = is != nullptr
 		? is->LockReadTag()

src/decoder/Bridge.hxx

@@ -174,7 +174,7 @@ private:
 	 */
 	DecoderCommand DoSendTag(const Tag &tag);
 
-	bool UpdateStreamTag(InputStream *is);
+	bool UpdateStreamTag(InputStream *is) noexcept;
 };
 
 #endif

src/input/AsyncInputStream.cxx

@@ -157,7 +157,7 @@ AsyncInputStream::SeekDone() noexcept
 }
 
 std::unique_ptr<Tag>
-AsyncInputStream::ReadTag()
+AsyncInputStream::ReadTag() noexcept
 {
 	return std::exchange(tag, nullptr);
 }

src/input/AsyncInputStream.hxx

@@ -84,7 +84,7 @@ public:
 	void Check() final;
 	bool IsEOF() noexcept final;
 	void Seek(offset_type new_offset) final;
-	std::unique_ptr<Tag> ReadTag() final;
+	std::unique_ptr<Tag> ReadTag() noexcept final;
 	bool IsAvailable() noexcept final;
 	size_t Read(void *ptr, size_t read_size) final;
 

src/input/FailingInputStream.hxx

@@ -53,10 +53,6 @@ public:
 		return false;
 	}
 
-	std::unique_ptr<Tag> ReadTag() override {
-		std::rethrow_exception(error);
-	}
-
 	size_t Read(void *, size_t) override {
 		std::rethrow_exception(error);
 	}

src/input/IcyInputStream.cxx

@@ -47,7 +47,7 @@ IcyInputStream::Update() noexcept
 }
 
 std::unique_ptr<Tag>
-IcyInputStream::ReadTag()
+IcyInputStream::ReadTag() noexcept
 {
 	auto new_input_tag = ProxyInputStream::ReadTag();
 	if (!IsEnabled())

src/input/IcyInputStream.hxx

@@ -65,7 +65,7 @@ public:
 
 	/* virtual methods from InputStream */
 	void Update() noexcept override;
-	std::unique_ptr<Tag> ReadTag() override;
+	std::unique_ptr<Tag> ReadTag() noexcept override;
 	size_t Read(void *ptr, size_t size) override;
 };
 

src/input/InputStream.cxx

@@ -92,13 +92,13 @@ InputStream::LockSkip(offset_type _offset)
 }
 
 std::unique_ptr<Tag>
-InputStream::ReadTag()
+InputStream::ReadTag() noexcept
 {
 	return nullptr;
 }
 
 std::unique_ptr<Tag>
-InputStream::LockReadTag()
+InputStream::LockReadTag() noexcept
 {
 	const std::lock_guard<Mutex> protect(mutex);
 	return ReadTag();

src/input/InputStream.hxx

@@ -325,13 +325,13 @@ public:
 	 * @return a tag object or nullptr if the tag has not changed
 	 * since the last call
 	 */
-	virtual std::unique_ptr<Tag> ReadTag();
+	virtual std::unique_ptr<Tag> ReadTag() noexcept;
 
 	/**
 	 * Wrapper for ReadTag() which locks and unlocks the mutex;
 	 * the caller must not be holding it already.
 	 */
-	std::unique_ptr<Tag> LockReadTag();
+	std::unique_ptr<Tag> LockReadTag() noexcept;
 
 	/**
 	 * Returns true if the next read operation will not block: either data

src/input/ProxyInputStream.cxx

@@ -105,7 +105,7 @@ ProxyInputStream::IsEOF() noexcept
 }
 
 std::unique_ptr<Tag>
-ProxyInputStream::ReadTag()
+ProxyInputStream::ReadTag() noexcept
 {
 	if (!input)
 		return nullptr;

src/input/ProxyInputStream.hxx

@@ -62,7 +62,7 @@ public:
 	void Update() noexcept override;
 	void Seek(offset_type new_offset) override;
 	bool IsEOF() noexcept override;
-	std::unique_ptr<Tag> ReadTag() override;
+	std::unique_ptr<Tag> ReadTag() noexcept override;
 	bool IsAvailable() noexcept override;
 	size_t Read(void *ptr, size_t read_size) override;