[nce, fs] tico support, fix FS bug that would nuke entire 'switch' folder (#4086)

Contains the minimal set of functionalities to allow tico installer succeed, and tico work normally EXCEPT for game launching (which me or someone else will investigate later)

First three commits are from PR 4012.

The other six, kinda dizzy to explain each one. All were implemented based on tico source, switchbrew and libnx.
Hopefully the commit messages will do.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4086
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>

src/core/hle/service/ncm/ncm.cpp

@@ -1,9 +1,19 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <algorithm>
+#include <array>
 #include <memory>
+#include <vector>
 
+#include "core/core.h"
+#include "core/file_sys/registered_cache.h"
 #include "core/file_sys/romfs_factory.h"
+#include "core/hle/api_version.h"
+#include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/ipc_helpers.h"
 #include "core/hle/service/ncm/ncm.h"
 #include "core/hle/service/server_manager.h"
@@ -88,6 +98,268 @@ public:
     }
 };
 
+class IContentStorage final : public ServiceFramework<IContentStorage> {
+public:
+    explicit IContentStorage(Core::System& system_, FileSys::StorageId id)
+        : ServiceFramework{system_, "IContentStorage"}, storage{id} {
+        // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &IContentStorage::GeneratePlaceHolderId, "GeneratePlaceHolderId"},
+            {1, &IContentStorage::CreatePlaceHolder, "CreatePlaceHolder"},
+            {2, &IContentStorage::DeletePlaceHolder, "DeletePlaceHolder"},
+            {4, &IContentStorage::WritePlaceHolder, "WritePlaceHolder"},
+            {5, &IContentStorage::Register, "Register"},
+            {6, &IContentStorage::Delete, "Delete"},
+        };
+        // clang-format on
+
+        RegisterHandlers(functions);
+    }
+
+private:
+    void GeneratePlaceHolderId(HLERequestContext& ctx) {
+        LOG_DEBUG(Service_NCM, "called");
+
+        IPC::ResponseBuilder rb{ctx, 6};
+        rb.Push(ResultSuccess);
+        rb.PushRaw(FileSys::PlaceholderCache::Generate());
+    }
+
+    void CreatePlaceHolder(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        [[maybe_unused]] FileSys::NcaID content_id{};
+        FileSys::NcaID placeholder_id{};
+        if constexpr (HLE::ApiVersion::HOS_VERSION_MAJOR >= 16) {
+            placeholder_id = rp.PopRaw<FileSys::NcaID>();
+            content_id = rp.PopRaw<FileSys::NcaID>();
+        } else {
+            content_id = rp.PopRaw<FileSys::NcaID>();
+            placeholder_id = rp.PopRaw<FileSys::NcaID>();
+        }
+        const auto size = rp.Pop<s64>();
+
+        auto* const placeholder_cache =
+            system.GetFileSystemController().GetPlaceholderCacheForStorage(storage);
+        const bool succeeded =
+            placeholder_cache != nullptr && size >= 0 &&
+            (placeholder_cache->Exists(placeholder_id) ||
+             placeholder_cache->Create(placeholder_id, static_cast<u64>(size)));
+
+        if (succeeded) {
+            LOG_DEBUG(Service_NCM, "called, storage_id={}, size={}", static_cast<u32>(storage),
+                      size);
+        } else {
+            LOG_WARNING(Service_NCM, "failed, storage_id={}, size={}", static_cast<u32>(storage),
+                        size);
+        }
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(succeeded ? ResultSuccess : ResultUnknown);
+    }
+
+    void DeletePlaceHolder(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto placeholder_id = rp.PopRaw<FileSys::NcaID>();
+
+        auto* const placeholder_cache =
+            system.GetFileSystemController().GetPlaceholderCacheForStorage(storage);
+        const bool succeeded =
+            placeholder_cache != nullptr &&
+            (!placeholder_cache->Exists(placeholder_id) || placeholder_cache->Delete(placeholder_id));
+
+        if (succeeded) {
+            LOG_DEBUG(Service_NCM, "called, storage_id={}", static_cast<u32>(storage));
+        } else {
+            LOG_WARNING(Service_NCM, "failed, storage_id={}", static_cast<u32>(storage));
+        }
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(succeeded ? ResultSuccess : ResultUnknown);
+    }
+
+    void WritePlaceHolder(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto placeholder_id = rp.PopRaw<FileSys::NcaID>();
+        const auto offset = rp.Pop<u64>();
+        const auto data = ctx.ReadBuffer();
+
+        auto* const placeholder_cache =
+            system.GetFileSystemController().GetPlaceholderCacheForStorage(storage);
+        const std::vector<u8> write_data{data.begin(), data.end()};
+        const bool succeeded =
+            placeholder_cache != nullptr &&
+            placeholder_cache->Write(placeholder_id, offset, write_data);
+
+        if (succeeded) {
+            LOG_DEBUG(Service_NCM, "called, storage_id={}, offset={}, size={}",
+                      static_cast<u32>(storage), offset, data.size());
+        } else {
+            LOG_WARNING(Service_NCM, "failed, storage_id={}, offset={}, size={}",
+                        static_cast<u32>(storage), offset, data.size());
+        }
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(succeeded ? ResultSuccess : ResultUnknown);
+    }
+
+    void Register(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        FileSys::NcaID content_id{};
+        FileSys::NcaID placeholder_id{};
+        if constexpr (HLE::ApiVersion::HOS_VERSION_MAJOR >= 16) {
+            placeholder_id = rp.PopRaw<FileSys::NcaID>();
+            content_id = rp.PopRaw<FileSys::NcaID>();
+        } else {
+            content_id = rp.PopRaw<FileSys::NcaID>();
+            placeholder_id = rp.PopRaw<FileSys::NcaID>();
+        }
+
+        auto& fsc = system.GetFileSystemController();
+        auto* const placeholder_cache = fsc.GetPlaceholderCacheForStorage(storage);
+        auto* const registered_cache = fsc.GetRegisteredCacheForStorage(storage);
+        const bool succeeded =
+            placeholder_cache != nullptr && registered_cache != nullptr &&
+            placeholder_cache->Register(registered_cache, placeholder_id, content_id);
+
+        if (succeeded) {
+            LOG_DEBUG(Service_NCM, "called, storage_id={}", static_cast<u32>(storage));
+        } else {
+            LOG_WARNING(Service_NCM, "failed, storage_id={}", static_cast<u32>(storage));
+        }
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(succeeded ? ResultSuccess : ResultUnknown);
+    }
+
+    void Delete(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto content_id = rp.PopRaw<FileSys::NcaID>();
+
+        auto* const registered_cache =
+            system.GetFileSystemController().GetRegisteredCacheForStorage(storage);
+        const bool succeeded = registered_cache != nullptr && registered_cache->Delete(content_id);
+        if (succeeded) {
+            registered_cache->Refresh();
+        }
+
+        if (succeeded) {
+            LOG_DEBUG(Service_NCM, "called, storage_id={}", static_cast<u32>(storage));
+        } else {
+            LOG_WARNING(Service_NCM, "failed, storage_id={}", static_cast<u32>(storage));
+        }
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(succeeded ? ResultSuccess : ResultUnknown);
+    }
+
+    FileSys::StorageId storage;
+};
+
+class IContentMetaDatabase final : public ServiceFramework<IContentMetaDatabase> {
+public:
+    explicit IContentMetaDatabase(Core::System& system_, FileSys::StorageId id)
+        : ServiceFramework{system_, "IContentMetaDatabase"}, storage{id} {
+        // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &IContentMetaDatabase::Set, "Set"},
+            {2, &IContentMetaDatabase::Remove, "Remove"},
+            {8, &IContentMetaDatabase::Has, "Has"},
+            {15, &IContentMetaDatabase::Commit, "Commit"},
+        };
+        // clang-format on
+
+        RegisterHandlers(functions);
+    }
+
+private:
+    struct ContentMetaKey {
+        u64 id;
+        u32 version;
+        FileSys::TitleType type;
+        u8 install_type;
+        std::array<u8, 2> padding;
+    };
+    static_assert(sizeof(ContentMetaKey) == 0x10);
+
+    void Set(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto key = rp.PopRaw<ContentMetaKey>();
+
+        const auto entry_matches = [&key](const ContentMetaKey& entry) {
+            return entry.id == key.id && entry.version == key.version && entry.type == key.type &&
+                   entry.install_type == key.install_type;
+        };
+        if (std::find_if(entries.begin(), entries.end(), entry_matches) == entries.end()) {
+            entries.push_back(key);
+        }
+
+        LOG_DEBUG(Service_NCM,
+                  "called, storage_id={}, title_id={:016X}, version={}, type={}, size={}",
+                  static_cast<u32>(storage), key.id, key.version, static_cast<u8>(key.type),
+                  ctx.GetReadBufferSize());
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultSuccess);
+    }
+
+    void Remove(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto key = rp.PopRaw<ContentMetaKey>();
+
+        std::erase_if(entries, [&key](const ContentMetaKey& entry) {
+            return entry.id == key.id && entry.version == key.version && entry.type == key.type &&
+                   entry.install_type == key.install_type;
+        });
+
+        LOG_DEBUG(Service_NCM, "called, storage_id={}, title_id={:016X}, version={}, type={}",
+                  static_cast<u32>(storage), key.id, key.version, static_cast<u8>(key.type));
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultSuccess);
+    }
+
+    void Has(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto key = rp.PopRaw<ContentMetaKey>();
+
+        const bool has_pending =
+            std::find_if(entries.begin(), entries.end(), [&key](const ContentMetaKey& entry) {
+                return entry.id == key.id && entry.version == key.version &&
+                       entry.type == key.type && entry.install_type == key.install_type;
+            }) != entries.end();
+
+        auto* const registered_cache =
+            system.GetFileSystemController().GetRegisteredCacheForStorage(storage);
+        const bool has_registered =
+            registered_cache != nullptr &&
+            registered_cache->HasEntry(key.id, FileSys::ContentRecordType::Meta);
+
+        LOG_DEBUG(Service_NCM, "called, storage_id={}, title_id={:016X}, version={}, type={}, has={}",
+                  static_cast<u32>(storage), key.id, key.version, static_cast<u8>(key.type),
+                  has_pending || has_registered);
+
+        IPC::ResponseBuilder rb{ctx, 3};
+        rb.Push(ResultSuccess);
+        rb.Push(has_pending || has_registered);
+    }
+
+    void Commit(HLERequestContext& ctx) {
+        auto* const registered_cache =
+            system.GetFileSystemController().GetRegisteredCacheForStorage(storage);
+        if (registered_cache != nullptr) {
+            registered_cache->Refresh();
+        }
+
+        LOG_DEBUG(Service_NCM, "called, storage_id={}", static_cast<u32>(storage));
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultSuccess);
+    }
+
+    FileSys::StorageId storage;
+    std::vector<ContentMetaKey> entries;
+};
+
 class LR final : public ServiceFramework<LR> {
 public:
     explicit LR(Core::System& system_) : ServiceFramework{system_, "lr"} {
@@ -113,8 +385,8 @@ public:
             {1, nullptr, "CreateContentMetaDatabase"},
             {2, nullptr, "VerifyContentStorage"},
             {3, nullptr, "VerifyContentMetaDatabase"},
-            {4, nullptr, "OpenContentStorage"},
-            {5, nullptr, "OpenContentMetaDatabase"},
+            {4, &NCM::OpenContentStorage, "OpenContentStorage"},
+            {5, &NCM::OpenContentMetaDatabase, "OpenContentMetaDatabase"},
             {6, nullptr, "CloseContentStorageForcibly"},
             {7, nullptr, "CloseContentMetaDatabaseForcibly"},
             {8, nullptr, "CleanupContentMetaDatabase"},
@@ -130,6 +402,29 @@ public:
 
         RegisterHandlers(functions);
     }
+
+private:
+    void OpenContentStorage(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto storage_id = rp.PopEnum<FileSys::StorageId>();
+
+        LOG_DEBUG(Service_NCM, "called, storage_id={}", static_cast<u32>(storage_id));
+
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+        rb.Push(ResultSuccess);
+        rb.PushIpcInterface<IContentStorage>(ctx, system, storage_id);
+    }
+
+    void OpenContentMetaDatabase(HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto storage_id = rp.PopEnum<FileSys::StorageId>();
+
+        LOG_DEBUG(Service_NCM, "called, storage_id={}", static_cast<u32>(storage_id));
+
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+        rb.Push(ResultSuccess);
+        rb.PushIpcInterface<IContentMetaDatabase>(ctx, system, storage_id);
+    }
 };
 
 void LoopProcess(Core::System& system) {