Mod loader implementation. (#66)

* Initial mod loader implementation.

* Allow iterating in mod directories.

* Initial append archive implementation.

* Avoid calling function wrappers when loading append ARs.

For some reason they cause issues. Should investigate later.

* UMM merge archive support.

* Load merge archives without archive lists.

* Less thread locals.

I shouldn't worry about string allocations this much when the game itself spams them...

* Check for read-only UMM archives.

TODO: Skip merging as it's currently just doing duplicate loads.

* Skip loading merge archives if they are read-only.

* Merge only archives.

* Implement decompression.

* Fix append ARLs not loading.

* Initial save file redirection implementation.

* Slightly refactor resolved path usage.

* Implement save file redirection fallback.

* Set a default save file path if none is provided.

* Check for enabled option & replace backward slashes with forward ones in mod save file paths.

* Convert back slashes to forward ones when iterating directories.

* Make CSB limit dynamic.

* Cache append/merge archive lookups.

* Close stream after reading compressed ARL.

* Fix UMM/HMM ARL file path inconsistency.

UnleashedRecomp/CMakeLists.txt

@@ -194,6 +194,10 @@ set(SWA_USER_CXX_SOURCES
     "user/config.cpp"
 )
 
+set(SWA_MOD_CXX_SOURCES
+    "mod/mod_loader.cpp"
+)
+
 set(SWA_THIRDPARTY_SOURCES
     "${SWA_THIRDPARTY_ROOT}/imgui/backends/imgui_impl_sdl2.cpp"
     "${SWA_THIRDPARTY_ROOT}/imgui/imgui.cpp"
@@ -252,6 +256,7 @@ set(SWA_CXX_SOURCES
     ${SWA_UI_CXX_SOURCES}
     ${SWA_INSTALL_CXX_SOURCES}
     ${SWA_USER_CXX_SOURCES}
+    ${SWA_MOD_CXX_SOURCES}
     ${SWA_THIRDPARTY_SOURCES}
 )
 

UnleashedRecomp/kernel/io/file_system.cpp

@@ -5,6 +5,7 @@
 #include <kernel/function.h>
 #include <cpu/guest_thread.h>
 #include <os/logger.h>
+#include <mod/mod_loader.h>
 
 struct FileHandle : KernelObject
 {
@@ -15,21 +16,62 @@ struct FileHandle : KernelObject
 struct FindHandle : KernelObject
 {
     std::error_code ec;
-    std::filesystem::path searchPath;
-    std::filesystem::directory_iterator iterator;
+    ankerl::unordered_dense::map<std::u8string, std::pair<size_t, bool>> searchResult; // Relative path, file size, is directory
+    decltype(searchResult)::iterator iterator;
+
+    FindHandle(const std::string_view& path)
+    {
+        auto addDirectory = [&](const std::filesystem::path& directory)
+            {
+                for (auto& entry : std::filesystem::directory_iterator(directory, ec))
+                {
+                    std::u8string relativePath = entry.path().lexically_relative(directory).u8string();
+                    searchResult.emplace(relativePath, std::make_pair(entry.is_directory(ec) ? 0 : entry.file_size(ec), entry.is_directory(ec)));
+                }
+            };
+
+        std::string_view pathNoPrefix = path;
+        size_t index = pathNoPrefix.find(":\\");
+        if (index != std::string_view::npos)
+            pathNoPrefix.remove_prefix(index + 2);
+
+        // Force add a work folder to let the game see the files in mods,
+        // if by some rare chance the user has no DLC or update files.
+        if (pathNoPrefix.empty())
+            searchResult.emplace(u8"work", std::make_pair(0, true));
+
+        // Look for only work folder in mod folders, AR files cause issues.
+        if (pathNoPrefix.starts_with("work"))
+        {
+            std::string pathStr(pathNoPrefix);
+            std::replace(pathStr.begin(), pathStr.end(), '\\', '/');
+
+            for (size_t i = 0; ; i++)
+            {
+                auto* includeDirs = ModLoader::GetIncludeDirectories(i);
+                if (includeDirs == nullptr)
+                    break;
+
+                for (auto& includeDir : *includeDirs)
+                    addDirectory(includeDir / pathStr);
+            }
+        }
+
+        addDirectory(FileSystem::ResolvePath(path, false));
+
+        iterator = searchResult.begin();
+    }
 
     void fillFindData(WIN32_FIND_DATAA* lpFindFileData)
     {
-        if (iterator->is_directory())
+        if (iterator->second.second)
             lpFindFileData->dwFileAttributes = ByteSwap(FILE_ATTRIBUTE_DIRECTORY);
-        else if (iterator->is_regular_file())
+        else
             lpFindFileData->dwFileAttributes = ByteSwap(FILE_ATTRIBUTE_NORMAL);
 
-        std::u8string pathU8Str = iterator->path().lexically_relative(searchPath).u8string();
-        uint64_t fileSize = iterator->file_size(ec);
-        strncpy(lpFindFileData->cFileName, (const char *)(pathU8Str.c_str()), sizeof(lpFindFileData->cFileName));
-        lpFindFileData->nFileSizeLow = ByteSwap(uint32_t(fileSize >> 32U));
-        lpFindFileData->nFileSizeHigh = ByteSwap(uint32_t(fileSize));
+        strncpy(lpFindFileData->cFileName, (const char *)(iterator->first.c_str()), sizeof(lpFindFileData->cFileName));
+        lpFindFileData->nFileSizeLow = ByteSwap(uint32_t(iterator->second.first >> 32U));
+        lpFindFileData->nFileSizeHigh = ByteSwap(uint32_t(iterator->second.first));
         lpFindFileData->ftCreationTime = {};
         lpFindFileData->ftLastAccessTime = {};
         lpFindFileData->ftLastWriteTime = {};
@@ -50,7 +92,7 @@ SWA_API FileHandle* XCreateFileA
     assert(((dwShareMode & ~(FILE_SHARE_READ | FILE_SHARE_WRITE)) == 0) && "Unknown share mode bits.");
     assert(((dwCreationDisposition & ~(CREATE_NEW | CREATE_ALWAYS)) == 0) && "Unknown creation disposition bits.");
 
-    std::filesystem::path filePath = std::u8string_view((const char8_t*)(FileSystem::TransformPath(lpFileName)));
+    std::filesystem::path filePath = FileSystem::ResolvePath(lpFileName, true);
     std::fstream fileStream;
     std::ios::openmode fileOpenMode = std::ios::binary;
     if (dwDesiredAccess & (GENERIC_READ | FILE_READ_DATA))
@@ -228,45 +270,35 @@ uint32_t XSetFilePointerEx(FileHandle* hFile, int32_t lDistanceToMove, LARGE_INT
 
 FindHandle* XFindFirstFileA(const char* lpFileName, WIN32_FIND_DATAA* lpFindFileData)
 {
-    const char *transformedPath = FileSystem::TransformPath(lpFileName);
-    size_t transformedPathLength = strlen(transformedPath);
-    if (transformedPathLength == 0)
-        return (FindHandle*)GUEST_INVALID_HANDLE_VALUE;
-
-    std::filesystem::path dirPath;
-    if (strstr(transformedPath, "\\*") == (&transformedPath[transformedPathLength - 2]) || strstr(transformedPath, "/*") == (&transformedPath[transformedPathLength - 2]))
+    std::string_view path = lpFileName;
+    if (path.find("\\*") == (path.size() - 2) || path.find("/*") == (path.size() - 2))
     {
-        dirPath = std::u8string_view((const char8_t*)(transformedPath), transformedPathLength - 2);
+        path.remove_suffix(1);
     }
-    else if (strstr(transformedPath, "\\*.*") == (&transformedPath[transformedPathLength - 4]) || strstr(transformedPath, "/*.*") == (&transformedPath[transformedPathLength - 4]))
+    else if (path.find("\\*.*") == (path.size() - 4) || path.find("/*.*") == (path.size() - 4))
     {
-        dirPath = std::u8string_view((const char8_t *)(transformedPath), transformedPathLength - 4);
+        path.remove_suffix(3);
     }
     else
     {
-        dirPath = std::u8string_view((const char8_t *)(transformedPath), transformedPathLength);
-        assert(!dirPath.has_extension() && "Unknown search pattern.");
+        assert(!std::filesystem::path(path).has_extension() && "Unknown search pattern.");
     }
 
-    if (!std::filesystem::is_directory(dirPath))
+    FindHandle findHandle(path);
+
+    if (findHandle.searchResult.empty())
         return GetInvalidKernelObject<FindHandle>();
 
-    std::filesystem::directory_iterator dirIterator(dirPath);
-    if (dirIterator == std::filesystem::directory_iterator())
-        return GetInvalidKernelObject<FindHandle>();
+    findHandle.fillFindData(lpFindFileData);
 
-    FindHandle *findHandle = CreateKernelObject<FindHandle>();
-    findHandle->searchPath = std::move(dirPath);
-    findHandle->iterator = std::move(dirIterator);
-    findHandle->fillFindData(lpFindFileData);
-    return findHandle;
+    return CreateKernelObject<FindHandle>(std::move(findHandle));
 }
 
 uint32_t XFindNextFileA(FindHandle* Handle, WIN32_FIND_DATAA* lpFindFileData)
 {
     Handle->iterator++;
 
-    if (Handle->iterator == std::filesystem::directory_iterator())
+    if (Handle->iterator == Handle->searchResult.end())
     {
         return FALSE;
     }
@@ -305,7 +337,7 @@ uint32_t XReadFileEx(FileHandle* hFile, void* lpBuffer, uint32_t nNumberOfBytesT
 
 uint32_t XGetFileAttributesA(const char* lpFileName)
 {
-    std::filesystem::path filePath(std::u8string_view((const char8_t*)(FileSystem::TransformPath(lpFileName))));
+    std::filesystem::path filePath = FileSystem::ResolvePath(lpFileName, true);
     if (std::filesystem::is_directory(filePath))
         return FILE_ATTRIBUTE_DIRECTORY;
     else if (std::filesystem::is_regular_file(filePath))
@@ -328,52 +360,41 @@ uint32_t XWriteFile(FileHandle* hFile, const void* lpBuffer, uint32_t nNumberOfB
     return TRUE;
 }
 
-static void fixSlashes(char *path)
+std::filesystem::path FileSystem::ResolvePath(const std::string_view& path, bool checkForMods)
 {
-    while (*path != 0)
+    if (checkForMods)
     {
-        if (*path == '\\')
-        {
-            *path = '/';
+        std::filesystem::path resolvedPath = ModLoader::ResolvePath(path);
+        if (!resolvedPath.empty())
+            return resolvedPath;
     }
 
-        path++;
-    }
-}
+    thread_local std::string builtPath;
+    builtPath.clear();
 
-const char* FileSystem::TransformPath(const char* path)
-{
-    thread_local char builtPath[2048]{};
-    const char* relativePath = strstr(path, ":\\");
-    if (relativePath != nullptr)
+    size_t index = path.find(":\\");
+    if (index != std::string::npos)
     {
         // rooted folder, handle direction
-        const std::string_view root = std::string_view{ path, path + (relativePath - path) };
+        const std::string_view root = path.substr(0, index);
         const auto newRoot = XamGetRootPath(root);
 
         if (!newRoot.empty())
         {
-            strncpy(builtPath, newRoot.data(), newRoot.size());
-            builtPath[newRoot.size()] = '\\';
-            strcpy(builtPath + newRoot.size() + 1, relativePath + 2);
+            builtPath += newRoot;
+            builtPath += '/';
+        }
+        
+        builtPath += path.substr(index + 2);
     }
     else
     {
-            strncpy(builtPath, relativePath + 2, sizeof(builtPath));
-        }
-    }
-    else
-    {
-        strncpy(builtPath, path, sizeof(builtPath));
+        builtPath += path;
     }
 
-    fixSlashes(builtPath);
-    return builtPath;
-}
+    std::replace(builtPath.begin(), builtPath.end(), '\\', '/');
 
-SWA_API const char* XExpandFilePathA(const char* path)
-{
-    return FileSystem::TransformPath(path);
+    return std::u8string_view((const char8_t*)builtPath.c_str());
 }
 
 GUEST_FUNCTION_HOOK(sub_82BD4668, XCreateFileA);

UnleashedRecomp/kernel/io/file_system.h

@@ -2,5 +2,5 @@
 
 struct FileSystem
 {
-    static const char* TransformPath(const char* path);
+    static std::filesystem::path ResolvePath(const std::string_view& path, bool checkForMods);
 };

UnleashedRecomp/kernel/memory.h

@@ -19,6 +19,11 @@ public:
     void* Commit(size_t offset, size_t size);
     void* Reserve(size_t offset, size_t size);
 
+    bool IsInMemoryRange(const void* host) const noexcept
+    {
+        return host >= base && host < (base + size);
+    }
+
     void* Translate(size_t offset) const noexcept
     {
         if (offset)
@@ -27,12 +32,12 @@ public:
         return base + offset;
     }
 
-    uint32_t MapVirtual(void* host) const noexcept
+    uint32_t MapVirtual(const void* host) const noexcept
     {
         if (host)
-            assert(host >= base && host < (base + size));
+            assert(IsInMemoryRange(host));
 
-        return static_cast<uint32_t>(static_cast<char*>(host) - base);
+        return static_cast<uint32_t>(static_cast<const char*>(host) - base);
     }
 };
 

UnleashedRecomp/kernel/xam.cpp

@@ -308,7 +308,7 @@ SWA_API uint32_t XamContentCreateEx(uint32_t dwUserIndex, const char* szRootName
 
             if (pContentData->dwContentType == XCONTENTTYPE_SAVEDATA)
             {
-                std::u8string savePathU8 = GetSavePath().u8string();
+                std::u8string savePathU8 = GetSavePath(true).u8string();
                 root = (const char *)(savePathU8.c_str());
             }
             else if (pContentData->dwContentType == XCONTENTTYPE_DLC)

UnleashedRecomp/main.cpp

@@ -18,6 +18,7 @@
 #include <install/installer.h>
 #include <os/logger.h>
 #include <ui/installer_wizard.h>
+#include <mod/mod_loader.h>
 
 #define GAME_XEX_PATH "game:\\default.xex"
 
@@ -53,13 +54,26 @@ void KiSystemStartup()
     XamRegisterContent(gameContent, GAME_INSTALL_DIRECTORY "/game");
     XamRegisterContent(updateContent, GAME_INSTALL_DIRECTORY "/update");
 
-    const auto savePath = GetSavePath();
-    const auto saveName = "SYS-DATA";
+    const auto saveFilePath = GetSaveFilePath(true);
+    bool saveFileExists = std::filesystem::exists(saveFilePath);
 
-    if (std::filesystem::exists(savePath / saveName))
+    if (!saveFileExists)
     {
-        std::u8string savePathU8 = savePath.u8string();
-        XamRegisterContent(XamMakeContent(XCONTENTTYPE_SAVEDATA, saveName), (const char *)(savePathU8.c_str()));
+        // Copy base save data to modded save as fallback.
+        std::error_code ec;
+        std::filesystem::create_directories(saveFilePath.parent_path(), ec);
+
+        if (!ec)
+        {
+            std::filesystem::copy_file(GetSaveFilePath(false), saveFilePath, ec);
+            saveFileExists = !ec;
+        }
+    }
+
+    if (saveFileExists)
+    {
+        std::u8string savePathU8 = saveFilePath.parent_path().u8string();
+        XamRegisterContent(XamMakeContent(XCONTENTTYPE_SAVEDATA, "SYS-DATA"), (const char*)(savePathU8.c_str()));
     }
 
     // Mount game
@@ -175,12 +189,14 @@ int main(int argc, char *argv[])
         }
     }
 
+    ModLoader::Init();
+
     AchievementData::Load();
 
     KiSystemStartup();
 
-    const char *modulePath = FileSystem::TransformPath(GAME_XEX_PATH);
-    uint32_t entry = LdrLoadModule(std::u8string_view((const char8_t*)(modulePath)));
+    auto modulePath = FileSystem::ResolvePath(GAME_XEX_PATH, false);
+    uint32_t entry = LdrLoadModule(modulePath);
 
     if (!runInstallerWizard)
         Video::CreateHostDevice(sdlVideoDriver);

UnleashedRecomp/mod/ini_file.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <xxHashMap.h>
+
+class IniFile
+{
+protected:
+    struct Property
+    {
+        std::string name;
+        std::string value;
+    };
+
+    struct Section
+    {
+        std::string name;
+        xxHashMap<Property> properties;
+    };
+
+    xxHashMap<Section> m_sections;
+
+    static size_t hashStr(const std::string_view& str);
+
+    static bool isWhitespace(char value);
+    static bool isNewLine(char value);
+
+public:
+    bool read(const std::filesystem::path& filePath);
+
+    std::string getString(const std::string_view& sectionName, const std::string_view& propertyName, std::string defaultValue) const;
+
+    bool getBool(const std::string_view& sectionName, const std::string_view& propertyName, bool defaultValue) const;
+
+    template<typename T>
+    T get(const std::string_view& sectionName, const std::string_view& propertyName, T defaultValue) const;
+
+    template<typename T>
+    void enumerate(const T& function) const;
+
+    template<typename T>
+    void enumerate(const std::string_view& sectionName, const T& function) const;
+
+    bool contains(const std::string_view& sectionName) const;
+};
+
+#include "ini_file.inl"

UnleashedRecomp/mod/ini_file.inl

@@ -0,0 +1,205 @@
+inline size_t IniFile::hashStr(const std::string_view& str)
+{
+    return XXH3_64bits(str.data(), str.size());
+}
+
+inline bool IniFile::isWhitespace(char value)
+{
+    return value == ' ' || value == '\t';
+}
+
+inline bool IniFile::isNewLine(char value)
+{
+    return value == '\n' || value == '\r';
+}
+
+inline bool IniFile::read(const std::filesystem::path& filePath)
+{
+    std::ifstream file(filePath, std::ios::binary);
+    if (!file.good())
+        return false;
+
+    file.seekg(0, std::ios::end);
+
+    const size_t dataSize = static_cast<size_t>(file.tellg());
+    const auto data = std::make_unique<char[]>(dataSize + 1);
+    data[dataSize] = '\0';
+
+    file.seekg(0, std::ios::beg);
+    file.read(data.get(), dataSize);
+
+    file.close();
+
+    Section* section = nullptr;
+    const char* dataPtr = data.get();
+
+    while (dataPtr < data.get() + dataSize)
+    {
+        if (*dataPtr == ';')
+        {
+            while (*dataPtr != '\0' && !isNewLine(*dataPtr))
+                ++dataPtr;
+        }
+        else if (*dataPtr == '[')
+        {
+            ++dataPtr;
+            const char* endPtr = dataPtr;
+            while (*endPtr != '\0' && !isNewLine(*endPtr) && *endPtr != ']')
+                ++endPtr;
+
+            if (*endPtr != ']')
+                return false;
+
+            std::string sectionName(dataPtr, endPtr - dataPtr);
+            section = &m_sections[hashStr(sectionName)];
+            section->name = std::move(sectionName);
+
+            dataPtr = endPtr + 1;
+        }
+        else if (!isWhitespace(*dataPtr) && !isNewLine(*dataPtr))
+        {
+            if (section == nullptr)
+                return false;
+
+            const char* endPtr;
+            if (*dataPtr == '"')
+            {
+                ++dataPtr;
+                endPtr = dataPtr;
+
+                while (*endPtr != '\0' && !isNewLine(*endPtr) && *endPtr != '"')
+                    ++endPtr;
+
+                if (*endPtr != '"')
+                    return false;
+            }
+            else
+            {
+                endPtr = dataPtr;
+
+                while (*endPtr != '\0' && !isNewLine(*endPtr) && !isWhitespace(*endPtr) && *endPtr != '=')
+                    ++endPtr;
+
+                if (!isNewLine(*endPtr) && !isWhitespace(*endPtr) && *endPtr != '=')
+                    return false;
+            }
+
+            std::string propertyName(dataPtr, endPtr - dataPtr);
+            auto& property = section->properties[hashStr(propertyName)];
+            property.name = std::move(propertyName);
+
+            dataPtr = endPtr;
+            while (*dataPtr != '\0' && !isNewLine(*dataPtr) && *dataPtr != '=')
+                ++dataPtr;
+
+            if (*dataPtr == '=')
+            {
+                ++dataPtr;
+
+                while (*dataPtr != '\0' && isWhitespace(*dataPtr))
+                    ++dataPtr;
+
+                if (*dataPtr == '"')
+                {
+                    ++dataPtr;
+                    endPtr = dataPtr;
+
+                    while (*endPtr != '\0' && !isNewLine(*endPtr) && *endPtr != '"')
+                        ++endPtr;
+
+                    if (*endPtr != '"')
+                        return false;
+                }
+                else
+                {
+                    endPtr = dataPtr;
+
+                    while (*endPtr != '\0' && !isNewLine(*endPtr) && !isWhitespace(*endPtr))
+                        ++endPtr;
+                }
+
+                property.value = std::string(dataPtr, endPtr - dataPtr);
+                dataPtr = endPtr + 1;
+            }
+        }
+        else
+        {
+            ++dataPtr;
+        }
+    }
+
+    return true;
+}
+
+inline std::string IniFile::getString(const std::string_view& sectionName, const std::string_view& propertyName, std::string defaultValue) const
+{
+    const auto sectionPair = m_sections.find(hashStr(sectionName));
+    if (sectionPair != m_sections.end())
+    {
+        const auto propertyPair = sectionPair->second.properties.find(hashStr(propertyName));
+        if (propertyPair != sectionPair->second.properties.end())
+            return propertyPair->second.value;
+    }
+    return defaultValue;
+}
+
+inline bool IniFile::getBool(const std::string_view& sectionName, const std::string_view& propertyName, bool defaultValue) const
+{
+    const auto sectionPair = m_sections.find(hashStr(sectionName));
+    if (sectionPair != m_sections.end())
+    {
+        const auto propertyPair = sectionPair->second.properties.find(hashStr(propertyName));
+        if (propertyPair != sectionPair->second.properties.end() && !propertyPair->second.value.empty())
+        {
+            const char firstChar = propertyPair->second.value[0];
+            return firstChar == 't' || firstChar == 'T' || firstChar == 'y' || firstChar == 'Y' || firstChar == '1';
+        }
+    }
+    return defaultValue;
+}
+
+inline bool IniFile::contains(const std::string_view& sectionName) const
+{
+    return m_sections.contains(hashStr(sectionName));
+}
+
+template <typename T>
+T IniFile::get(const std::string_view& sectionName, const std::string_view& propertyName, T defaultValue) const
+{
+    const auto sectionPair = m_sections.find(hashStr(sectionName));
+    if (sectionPair != m_sections.end())
+    {
+        const auto propertyPair = sectionPair->second.properties.find(hashStr(propertyName));
+        if (propertyPair != sectionPair->second.properties.end())
+        {
+            T value{};
+            const auto result = std::from_chars(propertyPair->second.value.data(), 
+                propertyPair->second.value.data() + propertyPair->second.value.size(), value);
+
+            if (result.ec == std::errc{})
+                return value;
+        }
+    }
+    return defaultValue;
+}
+
+template<typename T>
+inline void IniFile::enumerate(const T& function) const
+{
+    for (const auto& [_, section] : m_sections)
+    {
+        for (auto& property : section.properties)
+            function(section.name, property.second.name, property.second.value);
+    }
+}
+
+template <typename T>
+void IniFile::enumerate(const std::string_view& sectionName, const T& function) const
+{
+    const auto sectionPair = m_sections.find(hashStr(sectionName));
+    if (sectionPair != m_sections.end())
+    {
+        for (const auto& property : sectionPair->second.properties)
+            function(property.second.name, property.second.value);
+    }
+}

UnleashedRecomp/mod/mod_loader.cpp

@@ -0,0 +1,781 @@
+#include "mod_loader.h"
+#include "ini_file.h"
+
+#include <api/Hedgehog/Base/System/hhAllocator.h>
+#include <cpu/guest_stack_var.h>
+#include <kernel/function.h>
+#include <kernel/heap.h>
+#include <xxHashMap.h>
+
+enum class ModType
+{
+    HMM,
+    UMM
+};
+
+struct Mod
+{
+    ModType type{};
+    std::vector<std::filesystem::path> includeDirs;
+    bool merge = false;
+    ankerl::unordered_dense::set<std::filesystem::path> readOnly;
+};
+
+static std::vector<Mod> g_mods;
+
+std::filesystem::path ModLoader::ResolvePath(std::string_view path)
+{
+    if (g_mods.empty())
+        return {};
+
+    std::string_view root;
+
+    size_t sepIndex = path.find(":\\");
+    if (sepIndex != std::string_view::npos)
+    {
+        root = path.substr(0, sepIndex);
+        path.remove_prefix(sepIndex + 2);
+    }
+
+    if (root == "save")
+    {
+        if (!ModLoader::s_saveFilePath.empty())
+        {
+            if (path == "SYS-DATA")
+                return ModLoader::s_saveFilePath;
+            else
+                return ModLoader::s_saveFilePath.parent_path() / path;
+        }
+
+        return {};
+    }
+
+    thread_local xxHashMap<std::filesystem::path> s_cache;
+
+    XXH64_hash_t hash = XXH3_64bits(path.data(), path.size());
+    auto findResult = s_cache.find(hash);
+    if (findResult != s_cache.end())
+        return findResult->second;
+
+    std::string pathStr(path);
+    std::replace(pathStr.begin(), pathStr.end(), '\\', '/');
+    std::filesystem::path fsPath(std::move(pathStr));
+
+    bool canBeMerged = 
+        path.find(".arl") == (path.size() - 4) ||
+        path.find(".ar.") == (path.size() - 6) ||
+        path.find(".ar") == (path.size() - 3);
+
+    for (auto& mod : g_mods)
+    {
+        if (mod.type == ModType::UMM && mod.merge && canBeMerged && !mod.readOnly.contains(fsPath))
+            continue;
+
+        for (auto& includeDir : mod.includeDirs)
+        {
+            std::filesystem::path modPath = includeDir / fsPath;
+            if (std::filesystem::exists(modPath))
+                return s_cache.emplace(hash, modPath).first->second;
+        }
+    }
+
+    return s_cache.emplace(hash, std::filesystem::path{}).first->second;
+}
+
+std::vector<std::filesystem::path>* ModLoader::GetIncludeDirectories(size_t modIndex)
+{
+    return modIndex < g_mods.size() ? &g_mods[modIndex].includeDirs : nullptr;
+}
+
+void ModLoader::Init()
+{
+    IniFile configIni;
+    if (!configIni.read("cpkredir.ini"))
+        return;
+
+    if (!configIni.getBool("CPKREDIR", "Enabled", true))
+        return;
+
+    if (configIni.getBool("CPKREDIR", "EnableSaveFileRedirection", false))
+    {
+        std::string saveFilePathU8 = configIni.getString("CPKREDIR", "SaveFileFallback", "");
+        if (!saveFilePathU8.empty())
+            ModLoader::s_saveFilePath = std::u8string_view((const char8_t*)saveFilePathU8.c_str());
+        else
+            ModLoader::s_saveFilePath = "mlsave/SYS-DATA";
+    }
+
+    std::string modsDbIniFilePathU8 = configIni.getString("CPKREDIR", "ModsDbIni", "");
+    if (modsDbIniFilePathU8.empty())
+        return;
+
+    IniFile modsDbIni;
+    if (!modsDbIni.read(std::u8string_view((const char8_t*)modsDbIniFilePathU8.c_str())))
+        return;
+
+    bool foundModSaveFilePath = false;
+
+    size_t activeModCount = modsDbIni.get<size_t>("Main", "ActiveModCount", 0);
+    for (size_t i = 0; i < activeModCount; ++i)
+    {
+        std::string modId = modsDbIni.getString("Main", fmt::format("ActiveMod{}", i), "");
+        if (modId.empty())
+            continue;
+
+        std::string modIniFilePathU8 = modsDbIni.getString("Mods", modId, "");
+        if (modIniFilePathU8.empty())
+            continue;
+
+        std::filesystem::path modIniFilePath(std::u8string_view((const char8_t*)modIniFilePathU8.c_str()));
+
+        IniFile modIni;
+        if (!modIni.read(modIniFilePath))
+            continue;
+
+        auto modDirectoryPath = modIniFilePath.parent_path();
+        std::string modSaveFilePathU8;
+
+        Mod mod;
+
+        if (modIni.contains("Details") || modIni.contains("Filesystem")) // UMM
+        {
+            mod.type = ModType::UMM;
+            mod.includeDirs.emplace_back(modDirectoryPath);
+            mod.merge = modIni.getBool("Details", "Merge", modIni.getBool("Filesystem", "Merge", false));
+
+            std::string readOnly = modIni.getString("Details", "Read-only", modIni.getString("Filesystem", "Read-only", std::string()));
+            std::replace(readOnly.begin(), readOnly.end(), '\\', '/');
+            std::string_view readOnlySplit = readOnly;
+
+            while (!readOnlySplit.empty())
+            {
+                size_t index = readOnlySplit.find(',');
+                if (index == std::string_view::npos)
+                {
+                    mod.readOnly.emplace(readOnlySplit);
+                    break;
+                }
+
+                mod.readOnly.emplace(readOnlySplit.substr(0, index));
+                readOnlySplit.remove_prefix(index + 1);
+            }
+
+            if (!foundModSaveFilePath)
+                modSaveFilePathU8 = modIni.getString("Details", "Save", modIni.getString("Filesystem", "Save", std::string()));
+        }
+        else // HMM
+        {
+            mod.type = ModType::HMM;
+
+            size_t includeDirCount = modIni.get<size_t>("Main", "IncludeDirCount", 0);
+            for (size_t j = 0; j < includeDirCount; j++)
+            {
+                std::string includeDirU8 = modIni.getString("Main", fmt::format("IncludeDir{}", j), "");
+                if (!includeDirU8.empty())
+                    mod.includeDirs.emplace_back(modDirectoryPath / std::u8string_view((const char8_t*)includeDirU8.c_str()));
+            }
+
+            if (!foundModSaveFilePath)
+                modSaveFilePathU8 = modIni.getString("Main", "SaveFile", std::string());
+        }
+
+        if (!mod.includeDirs.empty())
+            g_mods.emplace_back(std::move(mod));
+
+        if (!modSaveFilePathU8.empty())
+        {
+            std::replace(modSaveFilePathU8.begin(), modSaveFilePathU8.end(), '\\', '/');
+            ModLoader::s_saveFilePath = modDirectoryPath / std::u8string_view((const char8_t*)modSaveFilePathU8.c_str());
+            foundModSaveFilePath = true;
+        }
+    }
+}
+
+static constexpr uint32_t LZX_SIGNATURE = 0xFF512EE;
+
+static std::span<uint8_t> decompressLzx(PPCContext& ctx, uint8_t* base, const uint8_t* compressedData, size_t compressedDataSize, be<uint32_t>* scratchSpace)
+{
+    assert(g_memory.IsInMemoryRange(compressedData));
+
+    bool shouldFreeScratchSpace = false;
+    if (scratchSpace == nullptr)
+    {
+        scratchSpace = reinterpret_cast<be<uint32_t>*>(g_userHeap.Alloc(sizeof(uint32_t) * 2));
+        shouldFreeScratchSpace = true;
+    }
+
+    // Initialize decompressor
+    ctx.r3.u32 = 1;
+    ctx.r4.u32 = uint32_t((compressedData + 0xC) - base);
+    ctx.r5.u32 = *reinterpret_cast<const be<uint32_t>*>(compressedData + 0x8);
+    ctx.r6.u32 = uint32_t(reinterpret_cast<uint8_t*>(scratchSpace) - base);
+    sub_831CE1A0(ctx, base);
+
+    uint64_t decompressedDataSize = *reinterpret_cast<const be<uint64_t>*>(compressedData + 0x18);
+    uint8_t* decompressedData = reinterpret_cast<uint8_t*>(g_userHeap.Alloc(decompressedDataSize));
+
+    uint32_t blockSize = *reinterpret_cast<const be<uint32_t>*>(compressedData + 0x28);
+    size_t decompressedDataOffset = 0;
+    size_t compressedDataOffset = 0x30;
+
+    while (decompressedDataOffset < decompressedDataSize)
+    {
+        size_t decompressedBlockSize = decompressedDataSize - decompressedDataOffset;
+
+        if (decompressedBlockSize > blockSize)
+            decompressedBlockSize = blockSize;
+
+        *(scratchSpace + 1) = decompressedBlockSize;
+
+        uint32_t compressedBlockSize = *reinterpret_cast<const be<uint32_t>*>(compressedData + compressedDataOffset);
+
+        // Decompress
+        ctx.r3.u32 = *scratchSpace;
+        ctx.r4.u32 = uint32_t((decompressedData + decompressedDataOffset) - base);
+        ctx.r5.u32 = uint32_t(reinterpret_cast<uint8_t*>(scratchSpace + 1) - base);
+        ctx.r6.u32 = uint32_t((compressedData + compressedDataOffset + 0x4) - base);
+        ctx.r7.u32 = compressedBlockSize;
+        sub_831CE0D0(ctx, base);
+
+        decompressedDataOffset += *(scratchSpace + 1);
+        compressedDataOffset += 0x4 + compressedBlockSize;
+    }
+
+    // Deinitialize decompressor
+    ctx.r3.u32 = *scratchSpace;
+    sub_831CE150(ctx, base);
+
+    if (shouldFreeScratchSpace)
+        g_userHeap.Free(scratchSpace);
+
+    return { decompressedData, decompressedDataSize };
+}
+
+// Hedgehog::Database::CDatabaseLoader::ReadArchiveList
+PPC_FUNC_IMPL(__imp__sub_82E0D3E8);
+PPC_FUNC(sub_82E0D3E8)
+{
+    if (g_mods.empty())
+    {
+        __imp__sub_82E0D3E8(ctx, base);
+        return;
+    }
+
+    thread_local ankerl::unordered_dense::set<std::string> s_fileNames;
+    s_fileNames.clear();
+
+    auto parseArlFileData = [&](const uint8_t* arlFileData, size_t arlFileSize)
+        {
+            struct ArlHeader
+            {
+                uint32_t signature;
+                uint32_t splitCount;
+            };
+
+            auto* arlHeader = reinterpret_cast<const ArlHeader*>(arlFileData);
+            size_t arlHeaderSize = sizeof(ArlHeader) + arlHeader->splitCount * sizeof(uint32_t);
+            const uint8_t* arlFileNames = arlFileData + arlHeaderSize;
+
+            while (arlFileNames < arlFileData + arlFileSize)
+            {
+                uint8_t fileNameSize = *arlFileNames;
+                ++arlFileNames;
+
+                s_fileNames.emplace(reinterpret_cast<const char*>(arlFileNames), fileNameSize);
+
+                arlFileNames += fileNameSize;
+            }
+
+            return arlHeaderSize;
+        };
+
+    auto parseArFileData = [&](const uint8_t* arFileData, size_t arFileSize)
+        {
+            struct ArEntry
+            {
+                uint32_t entrySize;
+                uint32_t dataSize;
+                uint32_t dataOffset;
+                uint32_t fileDateLow;
+                uint32_t fileDateHigh;
+            };
+
+            for (size_t i = 16; i < arFileSize; )
+            {
+                auto entry = reinterpret_cast<const ArEntry*>(arFileData + i);
+                s_fileNames.emplace(reinterpret_cast<const char*>(entry + 1));
+                i += entry->entrySize;
+            }
+        };
+
+    auto r3 = ctx.r3;
+    auto r4 = ctx.r4;
+    auto r5 = ctx.r5;
+    auto r6 = ctx.r6;
+
+    auto loadFile = [&]<typename TFunction>(const std::filesystem::path& filePath, const TFunction& function)
+    {
+        std::ifstream stream(filePath, std::ios::binary);
+        if (stream.good())
+        {
+            be<uint32_t> signature{};
+            stream.read(reinterpret_cast<char*>(&signature), sizeof(signature));
+
+            stream.seekg(0, std::ios::end);
+            size_t arlFileSize = stream.tellg();
+            stream.seekg(0, std::ios::beg);
+
+            if (signature == LZX_SIGNATURE)
+            {
+                void* compressedFileData = g_userHeap.Alloc(arlFileSize);
+                stream.read(reinterpret_cast<char*>(compressedFileData), arlFileSize);
+                stream.close();
+
+                auto fileData = decompressLzx(ctx, base, reinterpret_cast<uint8_t*>(compressedFileData), arlFileSize, nullptr);
+
+                g_userHeap.Free(compressedFileData);
+
+                function(fileData.data(), fileData.size());
+
+                g_userHeap.Free(fileData.data());
+            }
+            else
+            {
+                thread_local std::vector<uint8_t> s_fileData;
+
+                s_fileData.resize(arlFileSize);
+                stream.read(reinterpret_cast<char*>(s_fileData.data()), arlFileSize);
+                stream.close();
+
+                function(s_fileData.data(), arlFileSize);
+            }
+
+            return true;
+        }
+
+        return false;
+    };
+
+    thread_local xxHashMap<std::vector<std::pair<std::filesystem::path, bool>>> s_cache;
+
+    std::u8string_view arlFilePathU8(reinterpret_cast<const char8_t*>(base + PPC_LOAD_U32(ctx.r4.u32)));
+    XXH64_hash_t hash = XXH3_64bits(arlFilePathU8.data(), arlFilePathU8.size());
+    auto findResult = s_cache.find(hash);
+
+    if (findResult != s_cache.end())
+    {
+        for (const auto& [arlFilePath, isArchiveList] : findResult->second)
+        {
+            if (isArchiveList)
+                loadFile(arlFilePath, parseArlFileData);
+            else
+                loadFile(arlFilePath, parseArFileData);
+        }
+    }
+    else
+    {
+        std::vector<std::pair<std::filesystem::path, bool>> arlFilePaths;
+        std::filesystem::path arlFilePath;
+        std::filesystem::path arFilePath;
+        std::filesystem::path appendArlFilePath;
+
+        for (auto& mod : g_mods)
+        {
+            for (auto& includeDir : mod.includeDirs)
+            {
+                auto loadUncachedFile = [&](const std::filesystem::path& filePath, bool isArchiveList)
+                {
+                    if (mod.type == ModType::UMM && mod.readOnly.contains(filePath))
+                        return false;
+
+                    std::filesystem::path combinedFilePath = includeDir / filePath;
+
+                    bool success;
+                    if (isArchiveList)
+                        success = loadFile(combinedFilePath, parseArlFileData);
+                    else
+                        success = loadFile(combinedFilePath, parseArFileData);
+
+                    if (success)
+                        arlFilePaths.emplace_back(std::move(combinedFilePath), isArchiveList);
+
+                    return success;
+                };
+
+                if (mod.type == ModType::UMM)
+                {
+                    if (mod.merge)
+                    {
+                        if (arlFilePath.empty())
+                        {
+                            arlFilePath = arlFilePathU8;
+                            arlFilePath += ".arl";
+                        }
+
+                        if (!loadUncachedFile(arlFilePath, true))
+                        {
+                            if (arFilePath.empty())
+                            {
+                                arFilePath = arlFilePathU8;
+                                arFilePath += ".ar";
+                            }
+
+                            if (!loadUncachedFile(arFilePath, false))
+                            {
+                                thread_local std::filesystem::path s_tempPath;
+
+                                for (uint32_t i = 0; ; i++)
+                                {
+                                    s_tempPath = arFilePath;
+                                    s_tempPath += fmt::format(".{:02}", i);
+
+                                    if (!loadUncachedFile(s_tempPath, false))
+                                        break;
+                                }
+                            }
+                        }
+                    }
+                }
+                else if (mod.type == ModType::HMM)
+                {
+                    if (appendArlFilePath.empty())
+                    {
+                        if (arlFilePath.empty())
+                        {
+                            arlFilePath = arlFilePathU8;
+                            arlFilePath += ".arl";
+                        }
+
+                        appendArlFilePath = arlFilePath.parent_path();
+                        appendArlFilePath /= "+";
+                        appendArlFilePath += arlFilePath.filename();
+                    }
+
+                    loadUncachedFile(appendArlFilePath, true);
+                }
+            }
+        }
+
+        s_cache.emplace(hash, std::move(arlFilePaths));
+    }
+
+    ctx.r3 = r3;
+    ctx.r4 = r4;
+    ctx.r5 = r5;
+    ctx.r6 = r6;
+
+    if (s_fileNames.empty())
+    {
+        __imp__sub_82E0D3E8(ctx, base);
+        return;
+    }
+
+    size_t arlHeaderSize = parseArlFileData(base + ctx.r5.u32, ctx.r6.u32);
+    size_t arlFileSize = arlHeaderSize;
+
+    for (auto& fileName : s_fileNames)
+    {
+        arlFileSize += 1;
+        arlFileSize += fileName.size();
+    }
+
+    uint8_t* newArlFileData = reinterpret_cast<uint8_t*>(g_userHeap.Alloc(arlFileSize));
+    memcpy(newArlFileData, base + ctx.r5.u32, arlHeaderSize);
+
+    uint8_t* arlFileNames = newArlFileData + arlHeaderSize;
+    for (auto& fileName : s_fileNames)
+    {
+        *arlFileNames = uint8_t(fileName.size());
+        ++arlFileNames;
+        memcpy(arlFileNames, fileName.data(), fileName.size());
+        arlFileNames += fileName.size();
+    }
+
+    ctx.r5.u32 = uint32_t(newArlFileData - base);
+    ctx.r6.u32 = uint32_t(arlFileSize);
+
+    __imp__sub_82E0D3E8(ctx, base);
+
+    g_userHeap.Free(newArlFileData);
+}
+
+// Hedgehog::Database::SLoadElement::SLoadElement
+PPC_FUNC_IMPL(__imp__sub_82E140D8);
+PPC_FUNC(sub_82E140D8)
+{
+    // Store archive name as the pretty name to use it later for append archive loading.
+    // This is always set to an empty string for archives, so it should be safe to replace.
+    if (!g_mods.empty() && PPC_LOAD_U32(ctx.r5.u32) == 0x8200A621)
+        ctx.r5.u32 = ctx.r6.u32;
+
+    __imp__sub_82E140D8(ctx, base);
+}
+
+// Hedgehog::Database::CDatabaseLoader::CCreateFromArchive::CreateCallback
+PPC_FUNC_IMPL(__imp__sub_82E0B500);
+PPC_FUNC(sub_82E0B500)
+{
+    if (g_mods.empty())
+    {
+        __imp__sub_82E0B500(ctx, base);
+        return;
+    }
+
+    std::u8string_view arFilePathU8(reinterpret_cast<const char8_t*>(base + PPC_LOAD_U32(ctx.r5.u32)));
+    size_t index = arFilePathU8.find(u8".ar.00");
+    if (index == (arFilePathU8.size() - 6))
+    {
+        arFilePathU8.remove_suffix(3);
+    }
+    else
+    {
+        index = arFilePathU8.find(u8".ar");
+
+        if (index != (arFilePathU8.size() - 3) ||
+            arFilePathU8.starts_with(u8"tg-") ||
+            arFilePathU8.starts_with(u8"gia-") ||
+            arFilePathU8.starts_with(u8"gi-texture-"))
+        {
+            __imp__sub_82E0B500(ctx, base);
+            return;
+        }
+    }
+
+    auto r3 = ctx.r3; // Callback
+    auto r4 = ctx.r4; // Database
+    auto r5 = ctx.r5; // Name
+    auto r6 = ctx.r6; // Data
+    auto r7 = ctx.r7; // Size
+    auto r8 = ctx.r8; // Callback data
+
+    auto loadArchive = [&](const std::filesystem::path& arFilePath)
+        {
+            std::ifstream stream(arFilePath, std::ios::binary);
+            if (stream.good())
+            {
+                stream.seekg(0, std::ios::end);
+                size_t arFileSize = stream.tellg();
+
+                void* arFileData = g_userHeap.Alloc(arFileSize);
+                stream.seekg(0, std::ios::beg);
+                stream.read(reinterpret_cast<char*>(arFileData), arFileSize);
+                stream.close();
+
+                auto arFileDataHolder = reinterpret_cast<be<uint32_t>*>(g_userHeap.Alloc(sizeof(uint32_t) * 2));
+
+                if (*reinterpret_cast<be<uint32_t>*>(arFileData) == LZX_SIGNATURE)
+                {
+                    auto fileData = decompressLzx(ctx, base, reinterpret_cast<uint8_t*>(arFileData), arFileSize, arFileDataHolder);
+
+                    g_userHeap.Free(arFileData);
+
+                    arFileData = fileData.data();
+                    arFileSize = fileData.size();
+                }
+
+                arFileDataHolder[0] = g_memory.MapVirtual(arFileData);
+                arFileDataHolder[1] = NULL;
+
+                ctx.r3 = r3;
+                ctx.r4 = r4;
+                ctx.r5 = r5;
+                ctx.r6.u32 = g_memory.MapVirtual(arFileDataHolder);
+                ctx.r7.u32 = uint32_t(arFileSize);
+                ctx.r8 = r8;
+
+                __imp__sub_82E0B500(ctx, base);
+
+                g_userHeap.Free(arFileDataHolder);
+                g_userHeap.Free(arFileData);
+
+                return true;
+            }
+
+            return false;
+        };
+
+    thread_local xxHashMap<std::vector<std::filesystem::path>> s_cache;
+
+    XXH64_hash_t hash = XXH3_64bits(arFilePathU8.data(), arFilePathU8.size());
+    auto findResult = s_cache.find(hash);
+    if (findResult != s_cache.end())
+    {
+        for (const auto& arFilePath : findResult->second)
+            loadArchive(arFilePath);
+    }
+    else
+    {
+        std::vector<std::filesystem::path> arFilePaths;
+        std::filesystem::path arFilePath;
+        std::filesystem::path appendArFilePath;
+
+        for (auto& mod : g_mods)
+        {
+            for (auto& includeDir : mod.includeDirs)
+            {
+                auto loadUncachedArchive = [&](const std::filesystem::path& arFilePath)
+                    {
+                        if (mod.type == ModType::UMM && mod.readOnly.contains(arFilePath))
+                            return false;
+
+                        std::filesystem::path combinedFilePath = includeDir / arFilePath;
+                        bool success = loadArchive(combinedFilePath);
+                        if (success)
+                            arFilePaths.emplace_back(std::move(combinedFilePath));
+
+                        return success;
+                    };
+
+                auto loadArchives = [&](const std::filesystem::path& arFilePath)
+                    {
+                        thread_local std::filesystem::path s_tempPath;
+                        s_tempPath = arFilePath;
+                        s_tempPath += "l";
+
+                        if (mod.type == ModType::UMM && mod.readOnly.contains(s_tempPath))
+                            return;
+
+                        std::ifstream stream(includeDir / s_tempPath, std::ios::binary);
+                        if (stream.good())
+                        {
+                            be<uint32_t> signature{};
+                            uint32_t splitCount{};
+                            stream.read(reinterpret_cast<char*>(&signature), sizeof(signature));
+
+                            if (signature == LZX_SIGNATURE)
+                            {
+                                stream.seekg(0, std::ios::end);
+                                size_t arlFileSize = stream.tellg();
+                                stream.seekg(0, std::ios::beg);
+
+                                void* compressedFileData = g_userHeap.Alloc(arlFileSize);
+                                stream.read(reinterpret_cast<char*>(compressedFileData), arlFileSize);
+                                stream.close();
+
+                                auto fileData = decompressLzx(ctx, base, reinterpret_cast<uint8_t*>(compressedFileData), arlFileSize, nullptr);
+
+                                g_userHeap.Free(compressedFileData);
+
+                                splitCount = *reinterpret_cast<uint32_t*>(fileData.data() + 0x4);
+
+                                g_userHeap.Free(fileData.data());
+                            }
+                            else
+                            {
+                                stream.read(reinterpret_cast<char*>(&splitCount), sizeof(splitCount));
+                                stream.close();
+                            }
+
+                            if (splitCount == 0)
+                            {
+                                loadUncachedArchive(arFilePath);
+                            }
+                            else
+                            {
+                                for (uint32_t i = 0; i < splitCount; i++)
+                                {
+                                    s_tempPath = arFilePath;
+                                    s_tempPath += fmt::format(".{:02}", i);
+                                    loadUncachedArchive(s_tempPath);
+                                }
+                            }
+                        }
+                        else if (mod.type == ModType::UMM)
+                        {
+                            if (!loadUncachedArchive(arFilePath))
+                            {
+                                for (uint32_t i = 0; ; i++)
+                                {
+                                    s_tempPath = arFilePath;
+                                    s_tempPath += fmt::format(".{:02}", i);
+                                    if (!loadUncachedArchive(s_tempPath))
+                                        break;
+                                }
+                            }
+                        }
+                    };
+
+                if (mod.type == ModType::UMM)
+                {
+                    if (mod.merge)
+                    {
+                        if (arFilePath.empty())
+                            arFilePath = arFilePathU8;
+
+                        loadArchives(arFilePath);
+                    }
+                }
+                else if (mod.type == ModType::HMM)
+                {
+                    if (appendArFilePath.empty())
+                    {
+                        if (arFilePath.empty())
+                            arFilePath = arFilePathU8;
+
+                        appendArFilePath = arFilePath.parent_path();
+                        appendArFilePath /= "+";
+                        appendArFilePath += arFilePath.filename();
+                    }
+
+                    loadArchives(appendArFilePath);
+                }
+            }
+        }
+
+        s_cache.emplace(hash, std::move(arFilePaths));
+    }
+
+    ctx.r3 = r3;
+    ctx.r4 = r4;
+    ctx.r5 = r5;
+    ctx.r6 = r6;
+    ctx.r7 = r7;
+    ctx.r8 = r8;
+
+    __imp__sub_82E0B500(ctx, base);
+}
+
+// CriAuObjLoc::AttachCueSheet
+PPC_FUNC_IMPL(__imp__sub_8314A310);
+PPC_FUNC(sub_8314A310)
+{
+    // allocator: 0x4
+    // capacity: 0x24
+    // count: 0x28
+    // data: 0x2C
+    uint32_t capacity = PPC_LOAD_U32(ctx.r3.u32 + 0x24);
+    if (capacity == PPC_LOAD_U32(ctx.r3.u32 + 0x28))
+    {
+        auto r3 = ctx.r3;
+        auto r4 = ctx.r4;
+        auto r5 = ctx.r5;
+
+        // Allocate
+        ctx.r3.u32 = PPC_LOAD_U32(r3.u32 + 0x4);
+        ctx.r4.u32 = (capacity * 2) * sizeof(uint32_t);
+        ctx.r5.u32 = 0x82195248; // AuObjCueSheet
+        ctx.r6.u32 = 0x4;
+        sub_83167FD8(ctx, base);
+
+        // Copy
+        uint32_t oldData = PPC_LOAD_U32(r3.u32 + 0x2C);
+        uint32_t newData = ctx.r3.u32;
+
+        memcpy(base + newData, base + oldData, capacity * sizeof(uint32_t));
+        memset(base + newData + (capacity * sizeof(uint32_t)), 0, capacity * sizeof(uint32_t));
+
+        PPC_STORE_U32(r3.u32 + 0x24, capacity * 2);
+        PPC_STORE_U32(r3.u32 + 0x2C, newData);
+
+        // Deallocate
+        ctx.r3.u32 = PPC_LOAD_U32(r3.u32 + 0x4);
+        ctx.r4.u32 = oldData;
+        sub_83168100(ctx, base);
+
+        ctx.r3 = r3;
+        ctx.r4 = r4;
+        ctx.r5 = r5;
+    }
+
+    __imp__sub_8314A310(ctx, base);
+}

UnleashedRecomp/mod/mod_loader.h

@@ -0,0 +1,12 @@
+#pragma once
+
+struct ModLoader
+{
+    static inline std::filesystem::path s_saveFilePath;
+    
+    static std::filesystem::path ResolvePath(std::string_view path);
+
+    static std::vector<std::filesystem::path>* GetIncludeDirectories(size_t modIndex);
+
+    static void Init();
+};

UnleashedRecomp/stdafx.h

@@ -49,6 +49,7 @@ using Microsoft::WRL::ComPtr;
 #include <list>
 #include <semaphore>
 #include <numeric>
+#include <charconv>
 
 #include "framework.h"
 #include "mutex.h"

UnleashedRecomp/user/achievement_data.cpp

@@ -104,10 +104,15 @@ bool AchievementData::VerifyChecksum()
 
 void AchievementData::Load()
 {
-    auto dataPath = GetDataPath();
+    auto dataPath = GetDataPath(true);
 
+    if (!std::filesystem::exists(dataPath))
+    {
+        // Try loading base achievement data as fallback.
+        dataPath = GetDataPath(false);
         if (!std::filesystem::exists(dataPath))
             return;
+    }
 
     std::ifstream file(dataPath, std::ios::binary);
 
@@ -160,7 +165,7 @@ void AchievementData::Load()
 
 void AchievementData::Save()
 {
-    std::ofstream file(GetDataPath(), std::ios::binary);
+    std::ofstream file(GetDataPath(true), std::ios::binary);
 
     if (!file)
     {

UnleashedRecomp/user/achievement_data.h

@@ -45,9 +45,9 @@ public:
 
     static inline Data Data{ ACH_SIGNATURE, ACH_VERSION };
 
-    static std::filesystem::path GetDataPath()
+    static std::filesystem::path GetDataPath(bool checkForMods)
     {
-        return GetSavePath() / "ACH-DATA";
+        return GetSavePath(checkForMods) / "ACH-DATA";
     }
 
     static time_t GetTimestamp(uint16_t id);

UnleashedRecomp/user/paths.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <mod/mod_loader.h>
+
 #define USER_DIRECTORY "SWA"
 
 #ifndef GAME_INSTALL_DIRECTORY
@@ -48,7 +50,20 @@ inline std::filesystem::path GetUserPath()
     return userPath;
 }
 
-inline std::filesystem::path GetSavePath()
+inline std::filesystem::path GetSavePath(bool checkForMods)
 {
+    if (checkForMods && !ModLoader::s_saveFilePath.empty())
+        return ModLoader::s_saveFilePath.parent_path();
+    else
         return GetUserPath() / "save";
 }
+
+// Returned file name may not necessarily be
+// equal to SYS-DATA as mods can assign anything.
+inline std::filesystem::path GetSaveFilePath(bool checkForMods)
+{
+    if (checkForMods && !ModLoader::s_saveFilePath.empty())
+        return ModLoader::s_saveFilePath;
+    else
+        return GetSavePath(false) / "SYS-DATA";
+}