io/Reader: use std::span

src/input/Reader.cxx

@@ -4,10 +4,10 @@
 #include "Reader.hxx"
 #include "InputStream.hxx"
 
-size_t
-InputStreamReader::Read(void *data, size_t size)
+std::size_t
+InputStreamReader::Read(std::span<std::byte> dest)
 {
-	size_t nbytes = is.LockRead(data, size);
+	size_t nbytes = is.LockRead(dest.data(), dest.size());
 	assert(nbytes > 0 || is.IsEOF());
 
 	return nbytes;

src/input/Reader.hxx

@@ -20,7 +20,7 @@ public:
 		:is(_is) {}
 
 	/* virtual methods from class Reader */
-	size_t Read(void *data, size_t size) override;
+	std::size_t Read(std::span<std::byte> dest) override;
 };
 
 #endif

src/input/plugins/FileInputPlugin.cxx

@@ -78,7 +78,7 @@ FileInputStream::Read(std::unique_lock<Mutex> &,
 
 	{
 		const ScopeUnlock unlock(mutex);
-		nbytes = reader.Read(ptr, read_size);
+		nbytes = reader.Read({static_cast<std::byte *>(ptr), read_size});
 	}
 
 	if (nbytes == 0 && !IsEOF())