2 files changed, 239 insertions, 0 deletions

diff --git a/src/frontend_common/CMakeLists.txt b/src/frontend_common/CMakeLists.txt
index 22e9337c4..94d8cc4c3 100644
--- a/src/frontend_common/CMakeLists.txt
+++ b/src/frontend_common/CMakeLists.txt
@@ -4,6 +4,7 @@
 add_library(frontend_common STATIC
     config.cpp
     config.h
+    content_manager.h
 )
 
 create_target_directory_groups(frontend_common)
diff --git a/src/frontend_common/content_manager.h b/src/frontend_common/content_manager.h
new file mode 100644
index 000000000..23f2979db
--- /dev/null
+++ b/src/frontend_common/content_manager.h
@@ -0,0 +1,238 @@
+// SPDX-FileCopyrightText: 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <boost/algorithm/string.hpp>
+#include "common/common_types.h"
+#include "common/literals.h"
+#include "core/core.h"
+#include "core/file_sys/common_funcs.h"
+#include "core/file_sys/content_archive.h"
+#include "core/file_sys/mode.h"
+#include "core/file_sys/nca_metadata.h"
+#include "core/file_sys/registered_cache.h"
+#include "core/file_sys/submission_package.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/loader/loader.h"
+
+namespace ContentManager {
+
+enum class InstallResult {
+    Success,
+    Overwrite,
+    Failure,
+    BaseInstallAttempted,
+};
+
+/**
+ * \brief Removes a single installed DLC
+ * \param fs_controller [FileSystemController] reference from the Core::System instance
+ * \param title_id Unique title ID representing the DLC which will be removed
+ * \return 'true' if successful
+ */
+inline bool RemoveDLC(const Service::FileSystem::FileSystemController& fs_controller,
+                      const u64 title_id) {
+    return fs_controller.GetUserNANDContents()->RemoveExistingEntry(title_id) ||
+           fs_controller.GetSDMCContents()->RemoveExistingEntry(title_id);
+}
+
+/**
+ * \brief Removes all DLC for a game
+ * \param system Raw pointer to the system instance
+ * \param program_id Program ID for the game that will have all of its DLC removed
+ * \return Number of DLC removed
+ */
+inline size_t RemoveAllDLC(Core::System* system, const u64 program_id) {
+    size_t count{};
+    const auto& fs_controller = system->GetFileSystemController();
+    const auto dlc_entries = system->GetContentProvider().ListEntriesFilter(
+        FileSys::TitleType::AOC, FileSys::ContentRecordType::Data);
+    std::vector<u64> program_dlc_entries;
+
+    for (const auto& entry : dlc_entries) {
+        if (FileSys::GetBaseTitleID(entry.title_id) == program_id) {
+            program_dlc_entries.push_back(entry.title_id);
+        }
+    }
+
+    for (const auto& entry : program_dlc_entries) {
+        if (RemoveDLC(fs_controller, entry)) {
+            ++count;
+        }
+    }
+    return count;
+}
+
+/**
+ * \brief Removes the installed update for a game
+ * \param fs_controller [FileSystemController] reference from the Core::System instance
+ * \param program_id Program ID for the game that will have its installed update removed
+ * \return 'true' if successful
+ */
+inline bool RemoveUpdate(const Service::FileSystem::FileSystemController& fs_controller,
+                         const u64 program_id) {
+    const auto update_id = program_id | 0x800;
+    return fs_controller.GetUserNANDContents()->RemoveExistingEntry(update_id) ||
+           fs_controller.GetSDMCContents()->RemoveExistingEntry(update_id);
+}
+
+/**
+ * \brief Removes the base content for a game
+ * \param fs_controller [FileSystemController] reference from the Core::System instance
+ * \param program_id Program ID for the game that will have its base content removed
+ * \return 'true' if successful
+ */
+inline bool RemoveBaseContent(const Service::FileSystem::FileSystemController& fs_controller,
+                              const u64 program_id) {
+    return fs_controller.GetUserNANDContents()->RemoveExistingEntry(program_id) ||
+           fs_controller.GetSDMCContents()->RemoveExistingEntry(program_id);
+}
+
+/**
+ * \brief Removes a mod for a game
+ * \param fs_controller [FileSystemController] reference from the Core::System instance
+ * \param program_id Program ID for the game where [mod_name] will be removed
+ * \param mod_name The name of a mod as given by FileSys::PatchManager::GetPatches. This corresponds
+ * with the name of the mod's directory in a game's load folder.
+ * \return 'true' if successful
+ */
+inline bool RemoveMod(const Service::FileSystem::FileSystemController& fs_controller,
+                      const u64 program_id, const std::string& mod_name) {
+    // Check general Mods (LayeredFS and IPS)
+    const auto mod_dir = fs_controller.GetModificationLoadRoot(program_id);
+    if (mod_dir != nullptr) {
+        return mod_dir->DeleteSubdirectoryRecursive(mod_name);
+    }
+
+    // Check SDMC mod directory (RomFS LayeredFS)
+    const auto sdmc_mod_dir = fs_controller.GetSDMCModificationLoadRoot(program_id);
+    if (sdmc_mod_dir != nullptr) {
+        return sdmc_mod_dir->DeleteSubdirectoryRecursive(mod_name);
+    }
+
+    return false;
+}
+
+/**
+ * \brief Installs an NSP
+ * \param system Raw pointer to the system instance
+ * \param vfs Raw pointer to the VfsFilesystem instance in Core::System
+ * \param filename Path to the NSP file
+ * \param callback Optional callback to report the progress of the installation. The first size_t
+ * parameter is the total size of the virtual file and the second is the current progress. If you
+ * return false to the callback, it will cancel the installation as soon as possible.
+ * \return [InstallResult] representing how the installation finished
+ */
+inline InstallResult InstallNSP(
+    Core::System* system, FileSys::VfsFilesystem* vfs, const std::string& filename,
+    const std::function<bool(size_t, size_t)>& callback = std::function<bool(size_t, size_t)>()) {
+    const auto copy = [callback](const FileSys::VirtualFile& src, const FileSys::VirtualFile& dest,
+                                 std::size_t block_size) {
+        if (src == nullptr || dest == nullptr) {
+            return false;
+        }
+        if (!dest->Resize(src->GetSize())) {
+            return false;
+        }
+
+        using namespace Common::Literals;
+        std::vector<u8> buffer(1_MiB);
+
+        for (std::size_t i = 0; i < src->GetSize(); i += buffer.size()) {
+            if (callback(src->GetSize(), i)) {
+                dest->Resize(0);
+                return false;
+            }
+            const auto read = src->Read(buffer.data(), buffer.size(), i);
+            dest->Write(buffer.data(), read, i);
+        }
+        return true;
+    };
+
+    std::shared_ptr<FileSys::NSP> nsp;
+    FileSys::VirtualFile file = vfs->OpenFile(filename, FileSys::Mode::Read);
+    if (boost::to_lower_copy(file->GetName()).ends_with(std::string("nsp"))) {
+        nsp = std::make_shared<FileSys::NSP>(file);
+        if (nsp->IsExtractedType()) {
+            return InstallResult::Failure;
+        }
+    } else {
+        return InstallResult::Failure;
+    }
+
+    if (nsp->GetStatus() != Loader::ResultStatus::Success) {
+        return InstallResult::Failure;
+    }
+    const auto res =
+        system->GetFileSystemController().GetUserNANDContents()->InstallEntry(*nsp, true, copy);
+    switch (res) {
+    case FileSys::InstallResult::Success:
+        return InstallResult::Success;
+    case FileSys::InstallResult::OverwriteExisting:
+        return InstallResult::Overwrite;
+    case FileSys::InstallResult::ErrorBaseInstall:
+        return InstallResult::BaseInstallAttempted;
+    default:
+        return InstallResult::Failure;
+    }
+}
+
+/**
+ * \brief Installs an NCA
+ * \param vfs Raw pointer to the VfsFilesystem instance in Core::System
+ * \param filename Path to the NCA file
+ * \param registered_cache Raw pointer to the registered cache that the NCA will be installed to
+ * \param title_type Type of NCA package to install
+ * \param callback Optional callback to report the progress of the installation. The first size_t
+ * parameter is the total size of the virtual file and the second is the current progress. If you
+ * return false to the callback, it will cancel the installation as soon as possible.
+ * \return [InstallResult] representing how the installation finished
+ */
+inline InstallResult InstallNCA(
+    FileSys::VfsFilesystem* vfs, const std::string& filename,
+    FileSys::RegisteredCache* registered_cache, const FileSys::TitleType title_type,
+    const std::function<bool(size_t, size_t)>& callback = std::function<bool(size_t, size_t)>()) {
+    const auto copy = [callback](const FileSys::VirtualFile& src, const FileSys::VirtualFile& dest,
+                                 std::size_t block_size) {
+        if (src == nullptr || dest == nullptr) {
+            return false;
+        }
+        if (!dest->Resize(src->GetSize())) {
+            return false;
+        }
+
+        using namespace Common::Literals;
+        std::vector<u8> buffer(1_MiB);
+
+        for (std::size_t i = 0; i < src->GetSize(); i += buffer.size()) {
+            if (callback(src->GetSize(), i)) {
+                dest->Resize(0);
+                return false;
+            }
+            const auto read = src->Read(buffer.data(), buffer.size(), i);
+            dest->Write(buffer.data(), read, i);
+        }
+        return true;
+    };
+
+    const auto nca = std::make_shared<FileSys::NCA>(vfs->OpenFile(filename, FileSys::Mode::Read));
+    const auto id = nca->GetStatus();
+
+    // Game updates necessary are missing base RomFS
+    if (id != Loader::ResultStatus::Success &&
+        id != Loader::ResultStatus::ErrorMissingBKTRBaseRomFS) {
+        return InstallResult::Failure;
+    }
+
+    const auto res = registered_cache->InstallEntry(*nca, title_type, true, copy);
+    if (res == FileSys::InstallResult::Success) {
+        return InstallResult::Success;
+    } else if (res == FileSys::InstallResult::OverwriteExisting) {
+        return InstallResult::Overwrite;
+    } else {
+        return InstallResult::Failure;
+    }
+}
+
+} // namespace ContentManager