FS: Stream RomFS from file instead of loading all of it to memory

1 files changed, 9 insertions, 4 deletions

diff --git a/src/core/loader/ncch.cpp b/src/core/loader/ncch.cpp
index 87603d198..2bf1a6a26 100644
--- a/src/core/loader/ncch.cpp
+++ b/src/core/loader/ncch.cpp
@@ -299,7 +299,7 @@ ResultStatus AppLoader_NCCH::ReadLogo(std::vector<u8>& buffer) const {
     return LoadSectionExeFS("logo", buffer);
 }
 
-ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) const {
+ResultStatus AppLoader_NCCH::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset, u64& size) const {
     if (!file->IsOpen())
         return ResultStatus::Error;
 
@@ -311,12 +311,17 @@ ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) const {
         LOG_DEBUG(Loader, "RomFS offset:           0x%08X", romfs_offset);
         LOG_DEBUG(Loader, "RomFS size:             0x%08X", romfs_size);
 
-        buffer.resize(romfs_size);
+        if (file->GetSize () < romfs_offset + romfs_size)
+            return ResultStatus::Error;
 
-        file->Seek(romfs_offset, SEEK_SET);
-        if (file->ReadBytes(&buffer[0], romfs_size) != romfs_size)
+        // We reopen the file, to allow its position to be independent from file's
+        romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
+        if (!romfs_file->IsOpen())
             return ResultStatus::Error;
 
+        offset = romfs_offset;
+        size = romfs_size;
+
         return ResultStatus::Success;
     }
     LOG_DEBUG(Loader, "NCCH has no RomFS");