src/filesystem.cpp
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /** | ||
| 2 | * @file filesystem.cpp | ||
| 3 | * @brief Implementation of file system utilities. | ||
| 4 | * | ||
| 5 | * Provides functions for file system operations, such as retrieving the directory of the currently executing module. | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include "DetourModKit/filesystem.hpp" | ||
| 9 | |||
| 10 | #include <windows.h> | ||
| 11 | #include <filesystem> | ||
| 12 | #include <iostream> | ||
| 13 | #include <stdexcept> | ||
| 14 | #include <string> | ||
| 15 | |||
| 16 | namespace DetourModKit | ||
| 17 | { | ||
| 18 | namespace | ||
| 19 | { | ||
| 20 | /** | ||
| 21 | * @brief Resolves the directory of the currently executing module. | ||
| 22 | * | ||
| 23 | * @details Called exactly once; the result is cached by the caller. Returns a wide string to preserve full | ||
| 24 | * Unicode fidelity on Windows. Diagnostics are written to stderr rather than Logger because this | ||
| 25 | * function executes during Logger construction (via generate_log_file_path), and calling | ||
| 26 | * log() here would deadlock on the magic-static guard that is already held by the | ||
| 27 | * in-progress Logger singleton init. | ||
| 28 | */ | ||
| 29 | 1404 | std::wstring resolve_module_directory() | |
| 30 | { | ||
| 31 | 1404 | HMODULE h_self_module = nullptr; | |
| 32 | 1404 | std::wstring result_directory_path; | |
| 33 | |||
| 34 | try | ||
| 35 | { | ||
| 36 | // Use the address of the public function to locate the containing module (DLL or EXE). | ||
| 37 |
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1404 | if (!GetModuleHandleExW( |
| 38 | GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, | ||
| 39 | reinterpret_cast<LPCWSTR>(&filesystem::get_runtime_directory), | ||
| 40 | &h_self_module | ||
| 41 |
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2808 | ) || |
| 42 |
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1404 | h_self_module == nullptr) |
| 43 | { | ||
| 44 | ✗ | const DWORD last_error = GetLastError(); | |
| 45 | throw std::runtime_error( | ||
| 46 | ✗ | "GetModuleHandleExW failed to retrieve module handle. Error: " + std::to_string(last_error) | |
| 47 | ✗ | ); | |
| 48 | } | ||
| 49 | |||
| 50 | // Dynamic buffer to support paths longer than MAX_PATH | ||
| 51 | 1404 | DWORD buf_size = MAX_PATH; | |
| 52 |
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1404 | std::wstring module_path_buffer(buf_size, L'\0'); |
| 53 | |||
| 54 | 1404 | constexpr DWORD MAX_MODULE_PATH = 32768; | |
| 55 | |||
| 56 | for (;;) | ||
| 57 | { | ||
| 58 |
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1404 | const DWORD path_length = GetModuleFileNameW(h_self_module, module_path_buffer.data(), buf_size); |
| 59 |
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1404 | if (path_length == 0) |
| 60 | { | ||
| 61 | ✗ | const DWORD last_error = GetLastError(); | |
| 62 | throw std::runtime_error( | ||
| 63 | ✗ | "GetModuleFileNameW failed to retrieve module path. Error: " + std::to_string(last_error) | |
| 64 | ✗ | ); | |
| 65 | } | ||
| 66 |
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1404 | if (path_length < buf_size) |
| 67 | { | ||
| 68 |
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1404 | module_path_buffer.resize(path_length); |
| 69 | 1404 | break; | |
| 70 | } | ||
| 71 | ✗ | if (buf_size >= MAX_MODULE_PATH) | |
| 72 | { | ||
| 73 | ✗ | throw std::runtime_error("GetModuleFileNameW: path exceeds maximum supported length."); | |
| 74 | } | ||
| 75 | // Buffer was too small, double and retry | ||
| 76 | ✗ | buf_size = (buf_size <= MAX_MODULE_PATH / 2) ? buf_size * 2 : MAX_MODULE_PATH; | |
| 77 | ✗ | module_path_buffer.resize(buf_size, L'\0'); | |
| 78 | ✗ | } | |
| 79 | |||
| 80 |
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1404 | const std::filesystem::path module_full_path(module_path_buffer); |
| 81 |
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1404 | result_directory_path = module_full_path.parent_path().wstring(); |
| 82 | 1404 | } | |
| 83 | ✗ | catch (const std::filesystem::filesystem_error &fs_err) | |
| 84 | { | ||
| 85 | ✗ | std::cerr << "[DMK Filesystem WARNING] Filesystem error: " << fs_err.what() | |
| 86 | ✗ | << ". Attempting to fall back to current working directory." << '\n'; | |
| 87 | ✗ | } | |
| 88 | ✗ | catch (const std::exception &e) | |
| 89 | { | ||
| 90 | ✗ | std::cerr << "[DMK Filesystem WARNING] Failed to determine module directory: " << e.what() | |
| 91 | ✗ | << ". Attempting to fall back to current working directory." << '\n'; | |
| 92 | ✗ | } | |
| 93 | |||
| 94 |
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1404 | if (result_directory_path.empty()) |
| 95 | { | ||
| 96 | ✗ | DWORD cwd_len = GetCurrentDirectoryW(0, nullptr); | |
| 97 | ✗ | std::wstring current_dir_buffer; | |
| 98 | |||
| 99 | ✗ | if (cwd_len > 0) | |
| 100 | { | ||
| 101 | ✗ | current_dir_buffer.resize(cwd_len, L'\0'); | |
| 102 | ✗ | const DWORD written = GetCurrentDirectoryW(cwd_len, current_dir_buffer.data()); | |
| 103 | ✗ | if (written > 0 && written < cwd_len) | |
| 104 | { | ||
| 105 | ✗ | current_dir_buffer.resize(written); | |
| 106 | } | ||
| 107 | ✗ | else if (written >= cwd_len) | |
| 108 | { | ||
| 109 | // Directory changed between calls, retry with new size | ||
| 110 | ✗ | current_dir_buffer.resize(static_cast<size_t>(written) + 1, L'\0'); | |
| 111 | ✗ | const DWORD retry = GetCurrentDirectoryW(written + 1, current_dir_buffer.data()); | |
| 112 | ✗ | current_dir_buffer.resize(retry > 0 ? retry : 0); | |
| 113 | } | ||
| 114 | else | ||
| 115 | { | ||
| 116 | ✗ | current_dir_buffer.clear(); | |
| 117 | } | ||
| 118 | } | ||
| 119 | |||
| 120 | ✗ | if (!current_dir_buffer.empty()) | |
| 121 | { | ||
| 122 | ✗ | result_directory_path = std::filesystem::path(current_dir_buffer).wstring(); | |
| 123 | std::cerr << "[DMK Filesystem WARNING] Using current working directory as fallback: " | ||
| 124 | ✗ | << std::filesystem::path(result_directory_path).string() << '\n'; | |
| 125 | } | ||
| 126 | else | ||
| 127 | { | ||
| 128 | ✗ | const DWORD last_error = GetLastError(); | |
| 129 | ✗ | result_directory_path = L"."; | |
| 130 | std::cerr << "[DMK Filesystem ERROR] Failed to get current working directory." | ||
| 131 | ✗ | << " Using relative path anchor '.'. Error: " << last_error << '\n'; | |
| 132 | } | ||
| 133 | ✗ | } | |
| 134 | 1404 | return result_directory_path; | |
| 135 | ✗ | } | |
| 136 | } // anonymous namespace | ||
| 137 | |||
| 138 | 11746 | std::wstring DetourModKit::filesystem::get_runtime_directory() | |
| 139 | { | ||
| 140 | // C++11 magic statics guarantee thread-safe, one-time initialization. The module directory never changes at | ||
| 141 | // runtime, so caching is safe. | ||
| 142 |
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11746 | static const std::wstring cached_directory = resolve_module_directory(); |
| 143 | 11746 | return cached_directory; | |
| 144 | } | ||
| 145 | |||
| 146 | namespace | ||
| 147 | { | ||
| 148 | 3 | std::string to_utf8(const std::wstring &wide) | |
| 149 | { | ||
| 150 |
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3 | if (wide.empty()) |
| 151 | { | ||
| 152 | ✗ | return {}; | |
| 153 | } | ||
| 154 |
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3 | if (wide.size() > static_cast<size_t>(INT_MAX)) |
| 155 | { | ||
| 156 | ✗ | return "."; | |
| 157 | } | ||
| 158 | 3 | const int wide_len = static_cast<int>(wide.size()); | |
| 159 |
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3 | const int needed = WideCharToMultiByte(CP_UTF8, 0, wide.data(), wide_len, nullptr, 0, nullptr, nullptr); |
| 160 |
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3 | if (needed <= 0) |
| 161 | { | ||
| 162 | ✗ | return "."; | |
| 163 | } | ||
| 164 |
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3 | std::string out(static_cast<size_t>(needed), '\0'); |
| 165 | const int written = | ||
| 166 |
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3 | WideCharToMultiByte(CP_UTF8, 0, wide.data(), wide_len, out.data(), needed, nullptr, nullptr); |
| 167 |
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3 | if (written <= 0) |
| 168 | { | ||
| 169 | ✗ | return "."; | |
| 170 | } | ||
| 171 | 3 | return out; | |
| 172 | 3 | } | |
| 173 | } // anonymous namespace | ||
| 174 | |||
| 175 | 5 | std::string DetourModKit::filesystem::get_runtime_directory_utf8() | |
| 176 | { | ||
| 177 |
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5 | static const std::string cached_directory_utf8 = to_utf8(get_runtime_directory()); |
| 178 | 5 | return cached_directory_utf8; | |
| 179 | } | ||
| 180 | } // namespace DetourModKit | ||
| 181 |