Introduce NACP class for reading control data

This contains info such as the application name and publisher.

app/CMakeLists.txt

@@ -95,6 +95,7 @@ add_library(skyline SHARED
         ${source_DIR}/skyline/services/visrv/IManagerRootService.cpp
         ${source_DIR}/skyline/services/visrv/ISystemDisplayService.cpp
         ${source_DIR}/skyline/vfs/os_backing.cpp
+        ${source_DIR}/skyline/vfs/nacp.cpp
         )
 
 target_link_libraries(skyline vulkan android fmt tinyxml2 oboe)

app/src/main/cpp/skyline/vfs/nacp.cpp

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
+
+#include "nacp.h"
+
+namespace skyline::vfs {
+    NACP::NACP(const std::shared_ptr<vfs::Backing> &backing) {
+        backing->Read(&nacpContents);
+
+        // TODO: Select based on language settings, complete struct, yada yada
+        ApplicationTitle &languageEntry = nacpContents.titleEntries[0];
+        applicationName = std::string(languageEntry.applicationName.data(), languageEntry.applicationName.size());
+        applicationPublisher = std::string(languageEntry.applicationPublisher.data(), languageEntry.applicationPublisher.size());
+    }
+}

app/src/main/cpp/skyline/vfs/nacp.h

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
+
+#pragma once
+
+#include <array>
+#include <common.h>
+#include "backing.h"
+
+namespace skyline::vfs {
+    /**
+     * @brief The NACP class provides easy access to the data found in an NACP file (https://switchbrew.org/wiki/NACP_Format)
+     */
+    class NACP {
+      private:
+        /**
+         * @brief This contains the name and publisher of an application for one language
+         */
+        struct ApplicationTitle {
+            std::array<char, 0x200> applicationName; //!< The name of the application
+            std::array<char, 0x100> applicationPublisher; //!< The publisher of the application
+        };
+        static_assert(sizeof(ApplicationTitle) == 0x300);
+
+        /**
+         * @brief This struct encapsulates all the data within an NACP file
+         */
+        struct NacpData {
+            ApplicationTitle titleEntries[0x10]; //!< Title entries for each language
+            u8 _pad_[0x4000 - (0x10 * 0x300)];
+        } nacpContents{};
+        static_assert(sizeof(NacpData) == 0x4000);
+
+      public:
+        NACP(const std::shared_ptr<vfs::Backing> &backing);
+
+        std::string applicationName; //!< The name of the application in the currently selected language
+        std::string applicationPublisher; //!< The publisher of the application in the currently selected language
+    };
+}