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