Archives: Reduced duplicate code in RomFS and SaveCheck.

Fixed a few warnings and cleaned up the code

src/core/file_sys/archive_savedatacheck.cpp

@@ -0,0 +1,41 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/file_util.h"
+
+#include "core/file_sys/archive_savedatacheck.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+Archive_SaveDataCheck::Archive_SaveDataCheck(const std::string& mount_loc) : mount_point(mount_loc) {
+}
+
+ResultCode Archive_SaveDataCheck::Open(const Path& path) {
+    // TODO(Subv): We should not be overwriting raw_data everytime this function is called,
+    // but until we use factory classes to create the archives at runtime instead of creating them beforehand
+    // and allow multiple archives of the same type to be open at the same time without clobbering each other,
+    // we won't be able to maintain the state of each archive, hence we overwrite it every time it's needed.
+    // There are a number of problems with this, for example opening a file in this archive, then opening
+    // this archive again with a different path, will corrupt the previously open file.
+    auto vec = path.AsBinary();
+    const u32* data = reinterpret_cast<u32*>(vec.data());
+    std::string file_path = Common::StringFromFormat("%s%08x%08x.bin", mount_point.c_str(), data[1], data[0]);
+    FileUtil::IOFile file(file_path, "rb");
+
+    std::fill(raw_data.begin(), raw_data.end(), 0);
+
+    if (!file.IsOpen()) {
+        return ResultCode(-1); // TODO(Subv): Find the right error code
+    }
+    auto size = file.GetSize();
+    raw_data.resize(size);
+    file.ReadBytes(raw_data.data(), size);
+    file.Close();
+    return RESULT_SUCCESS;
+}
+
+} // namespace FileSys