| /* |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef COMPAT_W32DLFCN_H |
| #define COMPAT_W32DLFCN_H |
| |
| #ifdef _WIN32 |
| #include <windows.h> |
| #if _WIN32_WINNT < 0x0602 |
| #include "libavutil/wchar_filename.h" |
| #endif |
| /** |
| * Safe function used to open dynamic libs. This attempts to improve program security |
| * by removing the current directory from the dll search path. Only dll's found in the |
| * executable or system directory are allowed to be loaded. |
| * @param name The dynamic lib name. |
| * @return A handle to the opened lib. |
| */ |
| static inline HMODULE win32_dlopen(const char *name) |
| { |
| #if _WIN32_WINNT < 0x0602 |
| // Need to check if KB2533623 is available |
| if (!GetProcAddress(GetModuleHandleW(L"kernel32.dll"), "SetDefaultDllDirectories")) { |
| HMODULE module = NULL; |
| wchar_t *path = NULL, *name_w = NULL; |
| DWORD pathlen; |
| if (utf8towchar(name, &name_w)) |
| goto exit; |
| path = (wchar_t *)av_mallocz_array(MAX_PATH, sizeof(wchar_t)); |
| // Try local directory first |
| pathlen = GetModuleFileNameW(NULL, path, MAX_PATH); |
| pathlen = wcsrchr(path, '\\') - path; |
| if (pathlen == 0 || pathlen + wcslen(name_w) + 2 > MAX_PATH) |
| goto exit; |
| path[pathlen] = '\\'; |
| wcscpy(path + pathlen + 1, name_w); |
| module = LoadLibraryExW(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); |
| if (module == NULL) { |
| // Next try System32 directory |
| pathlen = GetSystemDirectoryW(path, MAX_PATH); |
| if (pathlen == 0 || pathlen + wcslen(name_w) + 2 > MAX_PATH) |
| goto exit; |
| path[pathlen] = '\\'; |
| wcscpy(path + pathlen + 1, name_w); |
| module = LoadLibraryExW(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); |
| } |
| exit: |
| av_free(path); |
| av_free(name_w); |
| return module; |
| } |
| #endif |
| #ifndef LOAD_LIBRARY_SEARCH_APPLICATION_DIR |
| # define LOAD_LIBRARY_SEARCH_APPLICATION_DIR 0x00000200 |
| #endif |
| #ifndef LOAD_LIBRARY_SEARCH_SYSTEM32 |
| # define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800 |
| #endif |
| return LoadLibraryExA(name, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32); |
| } |
| #define dlopen(name, flags) win32_dlopen(name) |
| #define dlclose FreeLibrary |
| #define dlsym GetProcAddress |
| #else |
| #include <dlfcn.h> |
| #endif |
| |
| #endif /* COMPAT_W32DLFCN_H */ |