src/filesystem.cpp
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /** | ||
| 2 | * @file filesystem.cpp | ||
| 3 | * @brief Module directory resolution and its never-destroyed caches. | ||
| 4 | */ | ||
| 5 | |||
| 6 | #include "DetourModKit/filesystem.hpp" | ||
| 7 | |||
| 8 | #include "internal/utf8_conversion.hpp" | ||
| 9 | |||
| 10 | #include <windows.h> | ||
| 11 | #include <filesystem> | ||
| 12 | #include <iostream> | ||
| 13 | #include <new> | ||
| 14 | #include <stdexcept> | ||
| 15 | #include <string> | ||
| 16 | |||
| 17 | namespace DetourModKit | ||
| 18 | { | ||
| 19 | namespace | ||
| 20 | { | ||
| 21 | /** | ||
| 22 | * @brief Resolves the directory of the currently executing module. | ||
| 23 | * | ||
| 24 | * @details Called exactly once; the result is cached by the caller. Returns a wide string to preserve full | ||
| 25 | * Unicode fidelity on Windows. Diagnostics are written to stderr rather than Logger because this | ||
| 26 | * function executes during Logger construction (via generate_log_file_path), and calling | ||
| 27 | * log() here would deadlock on the magic-static guard that is already held by the | ||
| 28 | * in-progress Logger singleton init. | ||
| 29 | */ | ||
| 30 | 3130 | std::wstring resolve_module_directory() | |
| 31 | { | ||
| 32 | 3130 | HMODULE h_self_module = nullptr; | |
| 33 | 3130 | std::wstring result_directory_path; | |
| 34 | |||
| 35 | try | ||
| 36 | { | ||
| 37 | // Use the address of the public function to locate the containing module (DLL or EXE). | ||
| 38 | 3130 | if (!GetModuleHandleExW( | |
| 39 | GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, | ||
| 40 | reinterpret_cast<LPCWSTR>(&filesystem::get_runtime_directory), | ||
| 41 | &h_self_module | ||
| 42 | 6260 | ) || | |
| 43 | 3130 | h_self_module == nullptr) | |
| 44 | { | ||
| 45 | ✗ | const DWORD last_error = GetLastError(); | |
| 46 | throw std::runtime_error( | ||
| 47 | ✗ | "GetModuleHandleExW failed to retrieve module handle. Error: " + std::to_string(last_error) | |
| 48 | ✗ | ); | |
| 49 | } | ||
| 50 | |||
| 51 | // Dynamic buffer to support paths longer than MAX_PATH | ||
| 52 | 3130 | DWORD buf_size = MAX_PATH; | |
| 53 | 3130 | std::wstring module_path_buffer(buf_size, L'\0'); | |
| 54 | |||
| 55 | 3130 | constexpr DWORD MAX_MODULE_PATH = 32768; | |
| 56 | |||
| 57 | for (;;) | ||
| 58 | { | ||
| 59 | 3130 | const DWORD path_length = GetModuleFileNameW(h_self_module, module_path_buffer.data(), buf_size); | |
| 60 | 3130 | if (path_length == 0) | |
| 61 | { | ||
| 62 | ✗ | const DWORD last_error = GetLastError(); | |
| 63 | throw std::runtime_error( | ||
| 64 | ✗ | "GetModuleFileNameW failed to retrieve module path. Error: " + std::to_string(last_error) | |
| 65 | ✗ | ); | |
| 66 | } | ||
| 67 | 3130 | if (path_length < buf_size) | |
| 68 | { | ||
| 69 | 3130 | module_path_buffer.resize(path_length); | |
| 70 | 3130 | break; | |
| 71 | } | ||
| 72 | ✗ | if (buf_size >= MAX_MODULE_PATH) | |
| 73 | { | ||
| 74 | ✗ | throw std::runtime_error("GetModuleFileNameW: path exceeds maximum supported length."); | |
| 75 | } | ||
| 76 | // Buffer was too small, double and retry | ||
| 77 | ✗ | buf_size = (buf_size <= MAX_MODULE_PATH / 2) ? buf_size * 2 : MAX_MODULE_PATH; | |
| 78 | ✗ | module_path_buffer.resize(buf_size, L'\0'); | |
| 79 | ✗ | } | |
| 80 | |||
| 81 | 3130 | const std::filesystem::path module_full_path(module_path_buffer); | |
| 82 | 3130 | result_directory_path = module_full_path.parent_path().wstring(); | |
| 83 | 3130 | } | |
| 84 | ✗ | catch (const std::filesystem::filesystem_error &fs_err) | |
| 85 | { | ||
| 86 | ✗ | std::cerr << "[DMK Filesystem WARNING] Filesystem error: " << fs_err.what() | |
| 87 | ✗ | << ". Attempting to fall back to current working directory." << '\n'; | |
| 88 | ✗ | } | |
| 89 | ✗ | catch (const std::exception &e) | |
| 90 | { | ||
| 91 | ✗ | std::cerr << "[DMK Filesystem WARNING] Failed to determine module directory: " << e.what() | |
| 92 | ✗ | << ". Attempting to fall back to current working directory." << '\n'; | |
| 93 | ✗ | } | |
| 94 | |||
| 95 | 3130 | if (result_directory_path.empty()) | |
| 96 | { | ||
| 97 | ✗ | DWORD cwd_len = GetCurrentDirectoryW(0, nullptr); | |
| 98 | ✗ | std::wstring current_dir_buffer; | |
| 99 | |||
| 100 | ✗ | if (cwd_len > 0) | |
| 101 | { | ||
| 102 | ✗ | current_dir_buffer.resize(cwd_len, L'\0'); | |
| 103 | ✗ | const DWORD written = GetCurrentDirectoryW(cwd_len, current_dir_buffer.data()); | |
| 104 | ✗ | if (written > 0 && written < cwd_len) | |
| 105 | { | ||
| 106 | ✗ | current_dir_buffer.resize(written); | |
| 107 | } | ||
| 108 | ✗ | else if (written >= cwd_len) | |
| 109 | { | ||
| 110 | // Directory changed between calls, retry with new size | ||
| 111 | ✗ | current_dir_buffer.resize(static_cast<size_t>(written) + 1, L'\0'); | |
| 112 | ✗ | const DWORD retry = GetCurrentDirectoryW(written + 1, current_dir_buffer.data()); | |
| 113 | ✗ | current_dir_buffer.resize(retry > 0 ? retry : 0); | |
| 114 | } | ||
| 115 | else | ||
| 116 | { | ||
| 117 | ✗ | current_dir_buffer.clear(); | |
| 118 | } | ||
| 119 | } | ||
| 120 | |||
| 121 | ✗ | if (!current_dir_buffer.empty()) | |
| 122 | { | ||
| 123 | ✗ | result_directory_path = std::filesystem::path(current_dir_buffer).wstring(); | |
| 124 | std::cerr << "[DMK Filesystem WARNING] Using current working directory as fallback: " | ||
| 125 | ✗ | << detail::utf8_from_wide(result_directory_path) << '\n'; | |
| 126 | } | ||
| 127 | else | ||
| 128 | { | ||
| 129 | ✗ | const DWORD last_error = GetLastError(); | |
| 130 | ✗ | result_directory_path = L"."; | |
| 131 | std::cerr << "[DMK Filesystem ERROR] Failed to get current working directory." | ||
| 132 | ✗ | << " Using relative path anchor '.'. Error: " << last_error << '\n'; | |
| 133 | } | ||
| 134 | ✗ | } | |
| 135 | 3130 | return result_directory_path; | |
| 136 | ✗ | } | |
| 137 | } // anonymous namespace | ||
| 138 | |||
| 139 | 13555 | std::wstring DetourModKit::filesystem::get_runtime_directory() | |
| 140 | { | ||
| 141 | // Never-destroyed storage (`[B-47]`): Logger::configure reads this cache after static destruction. | ||
| 142 | // Lifecycle.LoggerConfigureAfterPathCacheDestruction pins the late read. | ||
| 143 | alignas(std::wstring) static unsigned char storage[sizeof(std::wstring)]; | ||
| 144 | static const std::wstring *const cached_directory = | ||
| 145 | 13555 | ::new (static_cast<void *>(storage)) std::wstring(resolve_module_directory()); | |
| 146 | 13555 | return *cached_directory; | |
| 147 | } | ||
| 148 | |||
| 149 | namespace | ||
| 150 | { | ||
| 151 | 3 | std::string to_utf8(const std::wstring &wide) | |
| 152 | { | ||
| 153 | 3 | std::string text = detail::utf8_from_wide(wide); | |
| 154 | 3 | if (text.empty() && !wide.empty()) | |
| 155 | { | ||
| 156 | ✗ | return "."; | |
| 157 | } | ||
| 158 | 3 | return text; | |
| 159 | 3 | } | |
| 160 | } // anonymous namespace | ||
| 161 | |||
| 162 | 5 | std::string DetourModKit::filesystem::get_runtime_directory_utf8() | |
| 163 | { | ||
| 164 | alignas(std::string) static unsigned char storage[sizeof(std::string)]; | ||
| 165 | static const std::string *const cached_directory_utf8 = | ||
| 166 | 5 | ::new (static_cast<void *>(storage)) std::string(to_utf8(get_runtime_directory())); | |
| 167 | 5 | return *cached_directory_utf8; | |
| 168 | } | ||
| 169 | } // namespace DetourModKit | ||
| 170 |