Update per PR comments.

src/core/file_sys/archive_romfs.cpp

@@ -18,13 +18,13 @@ namespace FileSys {
 
 ArchiveFactory_RomFS::ArchiveFactory_RomFS(const Loader::AppLoader& app_loader) {
     // Load the RomFS from the app
-    if (Loader::ResultStatus::Success != app_loader.ReadRomFS(m_romfs_file, m_offset, m_size)) {
+    if (Loader::ResultStatus::Success != app_loader.ReadRomFS(romfs_file, data_offset, data_size)) {
         LOG_ERROR(Service_FS, "Unable to read RomFS!");
     }
 }
 
 ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_RomFS::Open(const Path& path) {
-    auto archive = Common::make_unique<IVFCArchive>(m_romfs_file, m_offset, m_size);
+    auto archive = Common::make_unique<IVFCArchive>(romfs_file, data_offset, data_size);
     return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
 }
 

src/core/file_sys/archive_romfs.h

@@ -27,9 +27,9 @@ public:
     ResultCode Format(const Path& path) override;
 
 private:
-    std::shared_ptr<FileUtil::IOFile> m_romfs_file;
-    u64 m_offset;
-    u64 m_size;
+    std::shared_ptr<FileUtil::IOFile> romfs_file;
+    u64 data_offset;
+    u64 data_size;
 };
 
 } // namespace FileSys

src/core/file_sys/ivfc_archive.cpp

@@ -21,7 +21,7 @@ std::string IVFCArchive::GetName() const {
 }
 
 std::unique_ptr<FileBackend> IVFCArchive::OpenFile(const Path& path, const Mode mode) const {
-    return Common::make_unique<IVFCFile>(m_romfs_file, m_offset, m_size);
+    return Common::make_unique<IVFCFile>(romfs_file, data_offset, data_size);
 }
 
 bool IVFCArchive::DeleteFile(const Path& path) const {
@@ -63,10 +63,10 @@ std::unique_ptr<DirectoryBackend> IVFCArchive::OpenDirectory(const Path& path) c
 
 size_t IVFCFile::Read(const u64 offset, const u32 length, u8* buffer) const {
     LOG_TRACE(Service_FS, "called offset=%llu, length=%d", offset, length);
-    m_romfs_file->Seek(m_offset + offset, SEEK_SET);
-    u32 read_length = (u32) std::min((u64) length, m_size - offset);
+    romfs_file->Seek(data_offset + offset, SEEK_SET);
+    u32 read_length = (u32)std::min((u64)length, data_size - offset);
 
-    return m_romfs_file->ReadBytes(buffer, read_length);
+    return romfs_file->ReadBytes(buffer, read_length);
 }
 
 size_t IVFCFile::Write(const u64 offset, const u32 length, const u32 flush, const u8* buffer) const {
@@ -75,7 +75,7 @@ size_t IVFCFile::Write(const u64 offset, const u32 length, const u32 flush, cons
 }
 
 size_t IVFCFile::GetSize() const {
-    return sizeof(u8) * m_size;
+    return sizeof(u8) * data_size;
 }
 
 bool IVFCFile::SetSize(const u64 size) const {

src/core/file_sys/ivfc_archive.h

@@ -26,8 +26,8 @@ namespace FileSys {
  */
 class IVFCArchive : public ArchiveBackend {
 public:
-    IVFCArchive(std::shared_ptr<FileUtil::IOFile> romfs_file, u64 offset, u64 size)
-        : m_romfs_file(romfs_file), m_offset(offset), m_size(size) {}
+    IVFCArchive(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size)
+        : romfs_file(file), data_offset(offset), data_size(size) {}
 
     std::string GetName() const override;
 
@@ -41,15 +41,15 @@ public:
     std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;
 
 protected:
-    std::shared_ptr<FileUtil::IOFile> m_romfs_file;
-    u64 m_offset;
-    u64 m_size;
+    std::shared_ptr<FileUtil::IOFile> romfs_file;
+    u64 data_offset;
+    u64 data_size;
 };
 
 class IVFCFile : public FileBackend {
 public:
-    IVFCFile(std::shared_ptr<FileUtil::IOFile> romfs_file, u64 offset, u64 size)
-        : m_romfs_file(romfs_file), m_offset(offset), m_size(size) {}
+    IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size)
+        : romfs_file(file), data_offset(offset), data_size(size) {}
 
     bool Open() override { return true; }
     size_t Read(const u64 offset, const u32 length, u8* buffer) const override;
@@ -60,9 +60,9 @@ public:
     void Flush() const override { }
 
 private:
-    std::shared_ptr<FileUtil::IOFile> m_romfs_file;
-    u64 m_offset;
-    u64 m_size;
+    std::shared_ptr<FileUtil::IOFile> romfs_file;
+    u64 data_offset;
+    u64 data_size;
 };
 
 class IVFCDirectory : public DirectoryBackend {

src/core/loader/loader.h

@@ -93,7 +93,7 @@ public:
 
     /**
      * Get the RomFS of the application
-     * Since the RomFS is huge, we return a file reference instead of copying to a buffer
+     * Since the RomFS can be huge, we return a file reference instead of copying to a buffer
      * @param romfs_file The file containing the RomFS
      * @param offset The offset the romfs begins on
      * @param size The size of the romfs

src/core/loader/ncch.cpp

@@ -289,13 +289,14 @@ ResultStatus AppLoader_NCCH::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_
         if (file->GetSize () < romfs_offset + romfs_size)
             return ResultStatus::Error;
 
-        // We reopen the file, to avoid reuse of the file offset
+        // We reopen the file, to allow its position to be independent from file's
         romfs_file.reset(new FileUtil::IOFile(filepath, "rb"));
+        if (!romfs_file->IsOpen())
+            return ResultStatus::Error;
+
         offset = romfs_offset;
         size = romfs_size;
 
-        if (!romfs_file->IsOpen())
-            return ResultStatus::Error;
         return ResultStatus::Success;
     }
     LOG_DEBUG(Loader, "NCCH has no RomFS");

src/core/loader/ncch.h

@@ -163,7 +163,7 @@ namespace Loader {
 /// Loads an NCCH file (e.g. from a CCI, or the first NCCH in a CXI)
 class AppLoader_NCCH final : public AppLoader {
 public:
-    AppLoader_NCCH(std::unique_ptr<FileUtil::IOFile>&& file, std::string filepath)
+    AppLoader_NCCH(std::unique_ptr<FileUtil::IOFile>&& file, const std::string& filepath)
         : AppLoader(std::move(file)), filepath(filepath) { }
 
     /**