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layered_fs: Do not open all replacement files on load
Instead open them when we want to read them. This is because the standard library has a limit on the number of opened files.
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@ -18,7 +18,7 @@ namespace FileSys {
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struct FileRelocationInfo {
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int type; // 0 - none, 1 - replaced / created, 2 - patched, 3 - removed
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u64 original_offset; // Type 0. Offset is absolute
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FileUtil::IOFile replace_file; // Type 1
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std::string replace_file_path; // Type 1
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std::vector<u8> patched_file; // Type 2
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u64 size; // Relocated file size
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};
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@ -175,14 +175,9 @@ void LayeredFS::LoadRelocations() {
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}
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auto* file = file_path_map.at(path);
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file->relocation.replace_file = FileUtil::IOFile(directory + virtual_name, "rb");
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if (file->relocation.replace_file) {
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file->relocation.type = 1;
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file->relocation.size = file->relocation.replace_file.GetSize();
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file->relocation.replace_file_path = directory + virtual_name;
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LOG_INFO(Service_FS, "LayeredFS replacement file in use for {}", path);
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} else {
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LOG_ERROR(Service_FS, "Could not open replacement file for {}", path);
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}
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return true;
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};
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@ -524,8 +519,14 @@ std::size_t LayeredFS::ReadFile(std::size_t offset, std::size_t length, u8* buff
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romfs->ReadFile(relocation.original_offset + relative_offset, to_read,
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buffer + read_size);
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} else if (relocation.type == 1) { // replace
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relocation.replace_file.Seek(relative_offset, SEEK_SET);
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relocation.replace_file.ReadBytes(buffer + read_size, to_read);
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FileUtil::IOFile replace_file(relocation.replace_file_path, "rb");
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if (replace_file) {
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replace_file.Seek(relative_offset, SEEK_SET);
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replace_file.ReadBytes(buffer + read_size, to_read);
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} else {
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LOG_ERROR(Service_FS, "Could not open replacement file for {}",
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current->second->path);
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}
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} else if (relocation.type == 2) { // patch
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std::memcpy(buffer + read_size, relocation.patched_file.data() + relative_offset,
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to_read);
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