citra_qt, core: game list "Open XXX Location" improvements

src/core/file_sys/archive_extsavedata.cpp

@@ -176,6 +176,13 @@ std::string GetExtDataContainerPath(const std::string& mount_point, bool shared)
     return fmt::format("{}Nintendo 3DS/{}/{}/extdata/", mount_point, SYSTEM_ID, SDCARD_ID);
 }
 
+std::string GetExtDataPathFromId(const std::string& mount_point, u64 extdata_id) {
+    u32 high = static_cast<u32>(extdata_id >> 32);
+    u32 low = static_cast<u32>(extdata_id & 0xFFFFFFFF);
+
+    return fmt::format("{}{:08x}/{:08x}/", GetExtDataContainerPath(mount_point, false), high, low);
+}
+
 Path ConstructExtDataBinaryPath(u32 media_type, u32 high, u32 low) {
     ExtSaveDataArchivePath path;
     path.media_type = media_type;

src/core/file_sys/archive_extsavedata.h

@@ -70,6 +70,15 @@ private:
  */
 std::string GetExtSaveDataPath(const std::string& mount_point, const Path& path);
 
+/**
+ * Constructs a path to the concrete ExtData archive in the host filesystem based on the
+ * extdata ID and base mount point.
+ * @param mount_point The base mount point of the ExtSaveData archives.
+ * @param extdata_id The id of the ExtSaveData
+ * @returns The complete path to the specified extdata archive in the host filesystem
+ */
+std::string GetExtDataPathFromId(const std::string& mount_point, u64 extdata_id);
+
 /**
  * Constructs a path to the base folder to hold concrete ExtSaveData archives in the host file
  * system.

src/core/file_sys/ncch_container.cpp

@@ -576,6 +576,23 @@ Loader::ResultStatus NCCHContainer::ReadProgramId(u64_le& program_id) {
     return Loader::ResultStatus::Success;
 }
 
+Loader::ResultStatus NCCHContainer::ReadExtdataId(u64& extdata_id) {
+    Loader::ResultStatus result = Load();
+    if (result != Loader::ResultStatus::Success)
+        return result;
+
+    if (!has_exheader)
+        return Loader::ResultStatus::ErrorNotUsed;
+
+    if (exheader_header.arm11_system_local_caps.storage_info.other_attributes >> 1) {
+        // Extdata id is not present when using extended savedata access
+        return Loader::ResultStatus::ErrorNotUsed;
+    }
+
+    extdata_id = exheader_header.arm11_system_local_caps.storage_info.ext_save_data_id;
+    return Loader::ResultStatus::Success;
+}
+
 bool NCCHContainer::HasExeFS() {
     Loader::ResultStatus result = Load();
     if (result != Loader::ResultStatus::Success)

src/core/file_sys/ncch_container.h

@@ -125,7 +125,7 @@ struct ExHeader_SystemInfo {
 };
 
 struct ExHeader_StorageInfo {
-    u8 ext_save_data_id[8];
+    u64_le ext_save_data_id;
     u8 system_save_data_id[8];
     u8 reserved[8];
     u8 access_info[7];
@@ -251,6 +251,12 @@ public:
      */
     Loader::ResultStatus ReadProgramId(u64_le& program_id);
 
+    /**
+     * Get the Extdata ID of the NCCH container
+     * @return ResultStatus result of function
+     */
+    Loader::ResultStatus ReadExtdataId(u64& extdata_id);
+
     /**
      * Checks whether the NCCH container contains an ExeFS
      * @return bool check result

src/core/loader/loader.h

@@ -157,6 +157,15 @@ public:
         return ResultStatus::ErrorNotImplemented;
     }
 
+    /**
+     * Get the extdata id for the application
+     * @param out_extdata_id Reference to store extdata id into
+     * @return ResultStatus result of function
+     */
+    virtual ResultStatus ReadExtdataId(u64& out_extdata_id) {
+        return ResultStatus::ErrorNotImplemented;
+    }
+
     /**
      * Get the RomFS of the application
      * Since the RomFS can be huge, we return a file reference instead of copying to a buffer

src/core/loader/ncch.cpp

@@ -216,6 +216,14 @@ ResultStatus AppLoader_NCCH::ReadProgramId(u64& out_program_id) {
     return ResultStatus::Success;
 }
 
+ResultStatus AppLoader_NCCH::ReadExtdataId(u64& out_extdata_id) {
+    ResultStatus result = base_ncch.ReadExtdataId(out_extdata_id);
+    if (result != ResultStatus::Success)
+        return result;
+
+    return ResultStatus::Success;
+}
+
 ResultStatus AppLoader_NCCH::ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) {
     return base_ncch.ReadRomFS(romfs_file);
 }

src/core/loader/ncch.h

@@ -51,6 +51,8 @@ public:
 
     ResultStatus ReadProgramId(u64& out_program_id) override;
 
+    ResultStatus ReadExtdataId(u64& out_extdata_id) override;
+
     ResultStatus ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;
 
     ResultStatus ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;