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nax: Avoid re-parsing NAX data with GetFileType() 

An instance of the NAX apploader already has an existing NAX instance in
memory. Calling directly into IdentifyType() directly would re-parse the
whole file again into yet another NAX instance, only to toss it away
again.

This gets rid of unnecessary/redundant file parsing and allocations.
merge-requests/60/head
Lioncash 2018-09-19 14:13:00 +07:00
parent c8c4105659
commit 45195a51a7
2 changed files with 19 additions and 13 deletions
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28
src/core/loader/nax.cpp
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@ -11,16 +11,8 @@
#include "core/loader/nca.h"
namespace Loader {
AppLoader_NAX::AppLoader_NAX(FileSys::VirtualFile file)
: AppLoader(file), nax(std::make_unique<FileSys::NAX>(file)),
nca_loader(std::make_unique<AppLoader_NCA>(nax->GetDecrypted())) {}
AppLoader_NAX::~AppLoader_NAX() = default;
FileType AppLoader_NAX::IdentifyType(const FileSys::VirtualFile& file) {
FileSys::NAX nax(file);
namespace {
FileType IdentifyTypeImpl(const FileSys::NAX& nax) {
if (nax.GetStatus() != ResultStatus::Success) {
return FileType::Error;
}
@ -32,6 +24,22 @@ FileType AppLoader_NAX::IdentifyType(const FileSys::VirtualFile& file) {
return FileType::NAX;
}
} // Anonymous namespace
AppLoader_NAX::AppLoader_NAX(FileSys::VirtualFile file)
: AppLoader(file), nax(std::make_unique<FileSys::NAX>(file)),
nca_loader(std::make_unique<AppLoader_NCA>(nax->GetDecrypted())) {}
AppLoader_NAX::~AppLoader_NAX() = default;
FileType AppLoader_NAX::IdentifyType(const FileSys::VirtualFile& file) {
const FileSys::NAX nax(file);
return IdentifyTypeImpl(nax);
}
FileType AppLoader_NAX::GetFileType() {
return IdentifyTypeImpl(*nax);
}
ResultStatus AppLoader_NAX::Load(Kernel::SharedPtr<Kernel::Process>& process) {
if (is_loaded) {

4
src/core/loader/nax.h
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@ -31,9 +31,7 @@ public:
*/
static FileType IdentifyType(const FileSys::VirtualFile& file);
FileType GetFileType() override {
return IdentifyType(file);
}
FileType GetFileType() override;
ResultStatus Load(Kernel::SharedPtr<Kernel::Process>& process) override;