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-rw-r--r--src/core/file_sys/card_image.cpp48
-rw-r--r--src/core/file_sys/card_image.h1
2 files changed, 42 insertions, 7 deletions
diff --git a/src/core/file_sys/card_image.cpp b/src/core/file_sys/card_image.cpp
index 5d02865f4..3e667e74a 100644
--- a/src/core/file_sys/card_image.cpp
+++ b/src/core/file_sys/card_image.cpp
@@ -31,13 +31,9 @@ XCI::XCI(VirtualFile file_, u64 program_id, size_t program_index)
: file(std::move(file_)), program_nca_status{Loader::ResultStatus::ErrorXCIMissingProgramNCA},
partitions(partition_names.size()),
partitions_raw(partition_names.size()), keys{Core::Crypto::KeyManager::Instance()} {
- if (file->ReadObject(&header) != sizeof(GamecardHeader)) {
- status = Loader::ResultStatus::ErrorBadXCIHeader;
- return;
- }
-
- if (header.magic != Common::MakeMagic('H', 'E', 'A', 'D')) {
- status = Loader::ResultStatus::ErrorBadXCIHeader;
+ const auto header_status = TryReadHeader();
+ if (header_status != Loader::ResultStatus::Success) {
+ status = header_status;
return;
}
@@ -316,6 +312,44 @@ Loader::ResultStatus XCI::AddNCAFromPartition(XCIPartition part) {
return Loader::ResultStatus::Success;
}
+Loader::ResultStatus XCI::TryReadHeader() {
+ constexpr size_t CardInitialDataRegionSize = 0x1000;
+
+ // Define the function we'll use to determine if we read a valid header.
+ const auto ReadCardHeader = [&]() {
+ // Ensure we can read the entire header. If we can't, we can't read the card image.
+ if (file->ReadObject(&header) != sizeof(GamecardHeader)) {
+ return Loader::ResultStatus::ErrorBadXCIHeader;
+ }
+
+ // Ensure the header magic matches. If it doesn't, this isn't a card image header.
+ if (header.magic != Common::MakeMagic('H', 'E', 'A', 'D')) {
+ return Loader::ResultStatus::ErrorBadXCIHeader;
+ }
+
+ // We read a card image header.
+ return Loader::ResultStatus::Success;
+ };
+
+ // Try to read the header directly.
+ if (ReadCardHeader() == Loader::ResultStatus::Success) {
+ return Loader::ResultStatus::Success;
+ }
+
+ // Get the size of the file.
+ const size_t card_image_size = file->GetSize();
+
+ // If we are large enough to have a key area, offset past the key area and retry.
+ if (card_image_size >= CardInitialDataRegionSize) {
+ file = std::make_shared<OffsetVfsFile>(file, card_image_size - CardInitialDataRegionSize,
+ CardInitialDataRegionSize);
+ return ReadCardHeader();
+ }
+
+ // We had no header and aren't large enough to have a key area, so this can't be parsed.
+ return Loader::ResultStatus::ErrorBadXCIHeader;
+}
+
u8 XCI::GetFormatVersion() {
return GetLogoPartition() == nullptr ? 0x1 : 0x2;
}
diff --git a/src/core/file_sys/card_image.h b/src/core/file_sys/card_image.h
index 1283f8216..9886123e7 100644
--- a/src/core/file_sys/card_image.h
+++ b/src/core/file_sys/card_image.h
@@ -128,6 +128,7 @@ public:
private:
Loader::ResultStatus AddNCAFromPartition(XCIPartition part);
+ Loader::ResultStatus TryReadHeader();
VirtualFile file;
GamecardHeader header{};