/* * 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> #include "config.h" #if (_WIN32_WINNT < 0x0602) || HAVE_WINRT #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 #if HAVE_WINRT wchar_t *name_w = NULL; int ret; if (utf8towchar(name, &name_w)) return NULL; ret = LoadPackagedLibrary(name_w, 0); av_free(name_w); return ret; #else return LoadLibraryExA(name, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32); #endif } #define dlopen(name, flags) win32_dlopen(name) #define dlclose FreeLibrary #define dlsym GetProcAddress #else #include <dlfcn.h> #endif #endif /* COMPAT_W32DLFCN_H */