mirror of https://git.ffmpeg.org/ffmpeg.git
95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/*
|
|
* 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_calloc(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 */
|