*: add "noexcept" to many, many function prototypes

This eliminates some overhead, because the compiler doesn't need to
consider these functions throwing.

src/input/AsyncInputStream.cxx

@@ -89,7 +89,7 @@ AsyncInputStream::Check()
 }
 
 bool
-AsyncInputStream::IsEOF()
+AsyncInputStream::IsEOF() noexcept
 {
 	return (KnownSize() && offset >= size) ||
 		(!open && buffer.IsEmpty());
@@ -164,7 +164,7 @@ AsyncInputStream::ReadTag()
 }
 
 bool
-AsyncInputStream::IsAvailable()
+AsyncInputStream::IsAvailable() noexcept
 {
 	return postponed_exception ||
 		IsEOF() ||

src/input/AsyncInputStream.hxx

@@ -82,10 +82,10 @@ public:
 
 	/* virtual methods from InputStream */
 	void Check() final;
-	bool IsEOF() final;
+	bool IsEOF() noexcept final;
 	void Seek(offset_type new_offset) final;
 	Tag *ReadTag() final;
-	bool IsAvailable() final;
+	bool IsAvailable() noexcept final;
 	size_t Read(void *ptr, size_t read_size) final;
 
 protected:

src/input/InputStream.cxx

@@ -75,14 +75,14 @@ InputStream::LockWaitReady()
  */
 gcc_pure
 static bool
-ExpensiveSeeking(const char *uri)
+ExpensiveSeeking(const char *uri) noexcept
 {
 	return StringStartsWith(uri, "http://") ||
 		StringStartsWith(uri, "https://");
 }
 
 bool
-InputStream::CheapSeeking() const
+InputStream::CheapSeeking() const noexcept
 {
 	return IsSeekable() && !ExpensiveSeeking(uri.c_str());
 }
@@ -121,7 +121,7 @@ InputStream::LockReadTag()
 }
 
 bool
-InputStream::IsAvailable()
+InputStream::IsAvailable() noexcept
 {
 	return true;
 }
@@ -169,7 +169,7 @@ InputStream::LockReadFull(void *ptr, size_t _size)
 }
 
 bool
-InputStream::LockIsEOF()
+InputStream::LockIsEOF() noexcept
 {
 	const std::lock_guard<Mutex> protect(mutex);
 	return IsEOF();

src/input/InputStream.hxx

@@ -261,7 +261,7 @@ public:
 	 * Determines whether seeking is cheap.  This is true for local files.
 	 */
 	gcc_pure
-	bool CheapSeeking() const;
+	bool CheapSeeking() const noexcept;
 
 	/**
 	 * Seeks to the specified position in the stream.  This will most
@@ -308,14 +308,14 @@ public:
 	 * The caller must lock the mutex.
 	 */
 	gcc_pure
-	virtual bool IsEOF() = 0;
+	virtual bool IsEOF() noexcept = 0;
 
 	/**
 	 * Wrapper for IsEOF() which locks and unlocks the mutex; the
 	 * caller must not be holding it already.
 	 */
 	gcc_pure
-	bool LockIsEOF();
+	bool LockIsEOF() noexcept;
 
 	/**
 	 * Reads the tag from the stream.
@@ -343,7 +343,7 @@ public:
 	 * The caller must lock the mutex.
 	 */
 	gcc_pure
-	virtual bool IsAvailable();
+	virtual bool IsAvailable() noexcept;
 
 	/**
 	 * Reads data from the stream into the caller-supplied buffer.

src/input/ProxyInputStream.cxx

@@ -70,7 +70,7 @@ ProxyInputStream::Seek(offset_type new_offset)
 }
 
 bool
-ProxyInputStream::IsEOF()
+ProxyInputStream::IsEOF() noexcept
 {
 	return input.IsEOF();
 }
@@ -82,7 +82,7 @@ ProxyInputStream::ReadTag()
 }
 
 bool
-ProxyInputStream::IsAvailable()
+ProxyInputStream::IsAvailable() noexcept
 {
 	return input.IsAvailable();
 }

src/input/ProxyInputStream.hxx

@@ -46,9 +46,9 @@ public:
 	void Check() override;
 	void Update() override;
 	void Seek(offset_type new_offset) override;
-	bool IsEOF() override;
+	bool IsEOF() noexcept override;
 	Tag *ReadTag() override;
-	bool IsAvailable() override;
+	bool IsAvailable() noexcept override;
 	size_t Read(void *ptr, size_t read_size) override;
 
 protected:

src/input/ThreadInputStream.cxx

@@ -124,7 +124,7 @@ ThreadInputStream::Check()
 }
 
 bool
-ThreadInputStream::IsAvailable()
+ThreadInputStream::IsAvailable() noexcept
 {
 	assert(!thread.IsInside());
 
@@ -158,7 +158,7 @@ ThreadInputStream::Read(void *ptr, size_t read_size)
 }
 
 bool
-ThreadInputStream::IsEOF()
+ThreadInputStream::IsEOF() noexcept
 {
 	assert(!thread.IsInside());
 

src/input/ThreadInputStream.hxx

@@ -84,8 +84,8 @@ public:
 
 	/* virtual methods from InputStream */
 	void Check() override final;
-	bool IsEOF() override final;
-	bool IsAvailable() override final;
+	bool IsEOF() noexcept final;
+	bool IsAvailable() noexcept final;
 	size_t Read(void *ptr, size_t size) override final;
 
 protected:

src/input/plugins/CdioParanoiaInputPlugin.cxx

@@ -96,7 +96,7 @@ class CdioParanoiaInputStream final : public InputStream {
 	}
 
 	/* virtual methods from InputStream */
-	bool IsEOF() override;
+	bool IsEOF() noexcept override;
 	size_t Read(void *ptr, size_t size) override;
 	void Seek(offset_type offset) override;
 };
@@ -340,7 +340,7 @@ CdioParanoiaInputStream::Read(void *ptr, size_t length)
 }
 
 bool
-CdioParanoiaInputStream::IsEOF()
+CdioParanoiaInputStream::IsEOF() noexcept
 {
 	return lsn_from + lsn_relofs > lsn_to;
 }

src/input/plugins/FfmpegInputPlugin.cxx

@@ -59,7 +59,7 @@ struct FfmpegInputStream final : public InputStream {
 	}
 
 	/* virtual methods from InputStream */
-	bool IsEOF() override;
+	bool IsEOF() noexcept override;
 	size_t Read(void *ptr, size_t size) override;
 	void Seek(offset_type offset) override;
 };
@@ -118,7 +118,7 @@ FfmpegInputStream::Read(void *ptr, size_t read_size)
 }
 
 bool
-FfmpegInputStream::IsEOF()
+FfmpegInputStream::IsEOF() noexcept
 {
 	return eof;
 }

src/input/plugins/FileInputPlugin.cxx

@@ -45,7 +45,7 @@ public:
 
 	/* virtual methods from InputStream */
 
-	bool IsEOF() override {
+	bool IsEOF() noexcept override {
 		return GetOffset() >= GetSize();
 	}
 

src/input/plugins/RewindInputPlugin.cxx

@@ -59,7 +59,7 @@ public:
 			ProxyInputStream::Update();
 	}
 
-	bool IsEOF() override {
+	bool IsEOF() noexcept override {
 		return !ReadingFromBuffer() && ProxyInputStream::IsEOF();
 	}
 

src/input/plugins/SmbclientInputPlugin.cxx

@@ -55,7 +55,7 @@ public:
 
 	/* virtual methods from InputStream */
 
-	bool IsEOF() override {
+	bool IsEOF() noexcept override {
 		return offset >= size;
 	}