2 files changed, 123 insertions, 0 deletions

diff --git a/src/core/file_sys/control_metadata.cpp b/src/core/file_sys/control_metadata.cpp
new file mode 100644
index 000000000..3ddc9f162
--- /dev/null
+++ b/src/core/file_sys/control_metadata.cpp
@@ -0,0 +1,42 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/string_util.h"
+#include "common/swap.h"
+#include "core/file_sys/control_metadata.h"
+
+namespace FileSys {
+
+std::string LanguageEntry::GetApplicationName() const {
+    return Common::StringFromFixedZeroTerminatedBuffer(application_name.data(), 0x200);
+}
+
+std::string LanguageEntry::GetDeveloperName() const {
+    return Common::StringFromFixedZeroTerminatedBuffer(developer_name.data(), 0x100);
+}
+
+NACP::NACP(VirtualFile file_) : file(std::move(file_)), raw(std::make_unique<RawNACP>()) {
+    file->ReadObject(raw.get());
+}
+
+const LanguageEntry& NACP::GetLanguageEntry(Language language) const {
+    return raw->language_entries.at(static_cast<u8>(language));
+}
+
+std::string NACP::GetApplicationName(Language language) const {
+    return GetLanguageEntry(language).GetApplicationName();
+}
+
+std::string NACP::GetDeveloperName(Language language) const {
+    return GetLanguageEntry(language).GetDeveloperName();
+}
+
+u64 NACP::GetTitleId() const {
+    return raw->title_id;
+}
+
+std::string NACP::GetVersionString() const {
+    return Common::StringFromFixedZeroTerminatedBuffer(raw->version_string.data(), 0x10);
+}
+} // namespace FileSys
diff --git a/src/core/file_sys/control_metadata.h b/src/core/file_sys/control_metadata.h
new file mode 100644
index 000000000..cc3b745f7
--- /dev/null
+++ b/src/core/file_sys/control_metadata.h
@@ -0,0 +1,81 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <memory>
+#include <string>
+#include "common/common_funcs.h"
+#include "core/file_sys/vfs.h"
+
+namespace FileSys {
+
+// A localized entry containing strings within the NACP.
+// One for each language of type Language.
+struct LanguageEntry {
+    std::array<char, 0x200> application_name;
+    std::array<char, 0x100> developer_name;
+
+    std::string GetApplicationName() const;
+    std::string GetDeveloperName() const;
+};
+static_assert(sizeof(LanguageEntry) == 0x300, "LanguageEntry has incorrect size.");
+
+// The raw file format of a NACP file.
+struct RawNACP {
+    std::array<LanguageEntry, 16> language_entries;
+    INSERT_PADDING_BYTES(0x38);
+    u64_le title_id;
+    INSERT_PADDING_BYTES(0x20);
+    std::array<char, 0x10> version_string;
+    u64_le dlc_base_title_id;
+    u64_le title_id_2;
+    INSERT_PADDING_BYTES(0x28);
+    u64_le product_code;
+    u64_le title_id_3;
+    std::array<u64_le, 0x7> title_id_array;
+    INSERT_PADDING_BYTES(0x8);
+    u64_le title_id_update;
+    std::array<u8, 0x40> bcat_passphrase;
+    INSERT_PADDING_BYTES(0xEC0);
+};
+static_assert(sizeof(RawNACP) == 0x4000, "RawNACP has incorrect size.");
+
+// A language on the NX. These are for names and icons.
+enum class Language : u8 {
+    AmericanEnglish = 0,
+    BritishEnglish = 1,
+    Japanese = 2,
+    French = 3,
+    German = 4,
+    LatinAmericanSpanish = 5,
+    Spanish = 6,
+    Italian = 7,
+    Dutch = 8,
+    CanadianFrench = 9,
+    Portugese = 10,
+    Russian = 11,
+    Korean = 12,
+    Taiwanese = 13,
+    Chinese = 14,
+};
+
+// A class representing the format used by NX metadata files, typically named Control.nacp.
+// These store application name, dev name, title id, and other miscellaneous data.
+class NACP {
+public:
+    explicit NACP(VirtualFile file);
+    const LanguageEntry& GetLanguageEntry(Language language = Language::AmericanEnglish) const;
+    std::string GetApplicationName(Language language = Language::AmericanEnglish) const;
+    std::string GetDeveloperName(Language language = Language::AmericanEnglish) const;
+    u64 GetTitleId() const;
+    std::string GetVersionString() const;
+
+private:
+    VirtualFile file;
+    std::unique_ptr<RawNACP> raw;
+};
+
+} // namespace FileSys