Move creation of file stream to new helper CreateFileStream

Source/mpqapi.cpp

@@ -90,7 +90,7 @@ struct FStreamWrapper {
 public:
 	bool Open(const char *path, std::ios::openmode mode)
 	{
-		s_ = std::make_unique<std::fstream>(path, mode);
+		s_ = CreateFileStream(path, mode);
 		return CheckError("new std::fstream(\"%s\", %s)", path, OpenModeToString(mode).c_str());
 	}
 

Source/utils/file_util.cpp

@@ -156,4 +156,9 @@ void RemoveFile(const char *lpFileName)
 #endif
 }
 
+std::unique_ptr<std::fstream> CreateFileStream(const char *path, std::ios::openmode mode)
+{
+	return std::make_unique<std::fstream>(path, mode);
+}
+
 } // namespace devilution

Source/utils/file_util.h

@@ -1,11 +1,14 @@
 #pragma once
 
 #include <cstdint>
+#include <fstream>
+#include <memory>
 namespace devilution {
 
 bool FileExists(const char *path);
 bool GetFileSize(const char *path, std::uintmax_t *size);
 bool ResizeFile(const char *path, std::uintmax_t size);
 void RemoveFile(const char *lpFileName);
+std::unique_ptr<std::fstream> CreateFileStream(const char *path, std::ios::openmode mode);
 
 } // namespace devilution