mirror of
https://github.com/FFmpeg/FFmpeg.git
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95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/*
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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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#include "config.h"
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#if (_WIN32_WINNT < 0x0602) || HAVE_WINRT
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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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#if HAVE_WINRT
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wchar_t *name_w = NULL;
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int ret;
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if (utf8towchar(name, &name_w))
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return NULL;
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ret = LoadPackagedLibrary(name_w, 0);
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av_free(name_w);
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return ret;
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#else
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return LoadLibraryExA(name, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32);
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#endif
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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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