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- #ifndef COMPAT_W32DLFCN_H
- #define COMPAT_W32DLFCN_H
- #ifdef _WIN32
- #include <stdint.h>
- #include <windows.h>
- #include "config.h"
- #include "libavutil/macros.h"
- #include "libavutil/mem.h"
- #include "libavutil/wchar_filename.h"
- static inline wchar_t *get_module_filename(HMODULE module)
- {
- wchar_t *path = NULL, *new_path;
- DWORD path_size = 0, path_len;
- do {
- path_size = path_size ? FFMIN(2 * path_size, INT16_MAX + 1) : MAX_PATH;
- new_path = av_realloc_array(path, path_size, sizeof *path);
- if (!new_path) {
- av_free(path);
- return NULL;
- }
- path = new_path;
-
-
-
- path_len = GetModuleFileNameW(module, path, path_size);
- } while (path_len && path_size <= INT16_MAX && path_size <= path_len);
- if (!path_len) {
- av_free(path);
- return NULL;
- }
- return path;
- }
- static inline HMODULE win32_dlopen(const char *name)
- {
- wchar_t *name_w;
- HMODULE module = NULL;
- if (utf8towchar(name, &name_w))
- name_w = NULL;
- #if _WIN32_WINNT < 0x0602
-
- if (!GetProcAddress(GetModuleHandleW(L"kernel32.dll"), "SetDefaultDllDirectories")) {
- wchar_t *path = NULL, *new_path;
- DWORD pathlen, pathsize, namelen;
- if (!name_w)
- goto exit;
- namelen = wcslen(name_w);
-
- path = get_module_filename(NULL);
- if (!path)
- goto exit;
- new_path = wcsrchr(path, '\\');
- if (!new_path)
- goto exit;
- pathlen = new_path - path;
- pathsize = pathlen + namelen + 2;
- new_path = av_realloc_array(path, pathsize, sizeof *path);
- if (!new_path)
- goto exit;
- path = new_path;
- wcscpy(path + pathlen + 1, name_w);
- module = LoadLibraryExW(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
- if (module == NULL) {
-
- pathlen = GetSystemDirectoryW(path, pathsize);
- if (!pathlen)
- goto exit;
-
-
-
- if (pathlen + namelen + 2 > pathsize) {
- pathsize = pathlen + namelen + 2;
- new_path = av_realloc_array(path, pathsize, sizeof *path);
- if (!new_path)
- goto exit;
- path = new_path;
-
- pathlen = GetSystemDirectoryW(path, pathsize);
- if (!pathlen)
- goto exit;
- }
- path[pathlen] = L'\\';
- 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
- if (!name_w)
- return NULL;
- module = LoadPackagedLibrary(name_w, 0);
- #else
- #define LOAD_FLAGS (LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32)
-
- if (!name_w)
- return LoadLibraryExA(name, NULL, LOAD_FLAGS);
- module = LoadLibraryExW(name_w, NULL, LOAD_FLAGS);
- #undef LOAD_FLAGS
- #endif
- av_free(name_w);
- return module;
- }
- #define dlopen(name, flags) win32_dlopen(name)
- #define dlclose FreeLibrary
- #define dlsym GetProcAddress
- #else
- #include <dlfcn.h>
- #endif
- #endif
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