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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
152 lines
4.9 KiB
C
152 lines
4.9 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 <stdint.h>
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#include <windows.h>
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#include "config.h"
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#include "libavutil/macros.h"
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#include "libavutil/mem.h"
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#include "libavutil/wchar_filename.h"
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static inline wchar_t *get_module_filename(HMODULE module)
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{
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wchar_t *path = NULL, *new_path;
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DWORD path_size = 0, path_len;
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do {
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path_size = path_size ? FFMIN(2 * path_size, INT16_MAX + 1) : MAX_PATH;
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new_path = av_realloc_array(path, path_size, sizeof *path);
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if (!new_path) {
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av_free(path);
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return NULL;
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}
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path = new_path;
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// Returns path_size in case of insufficient buffer.
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// Whether the error is set or not and whether the output
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// is null-terminated or not depends on the version of Windows.
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path_len = GetModuleFileNameW(module, path, path_size);
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} while (path_len && path_size <= INT16_MAX && path_size <= path_len);
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if (!path_len) {
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av_free(path);
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return NULL;
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}
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return path;
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}
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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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wchar_t *name_w;
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HMODULE module = NULL;
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if (utf8towchar(name, &name_w))
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name_w = NULL;
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#if _WIN32_WINNT < 0x0602
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// On Win7 and earlier we check if KB2533623 is available
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if (!GetProcAddress(GetModuleHandleW(L"kernel32.dll"), "SetDefaultDllDirectories")) {
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wchar_t *path = NULL, *new_path;
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DWORD pathlen, pathsize, namelen;
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if (!name_w)
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goto exit;
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namelen = wcslen(name_w);
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// Try local directory first
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path = get_module_filename(NULL);
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if (!path)
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goto exit;
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new_path = wcsrchr(path, '\\');
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if (!new_path)
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goto exit;
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pathlen = new_path - path;
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pathsize = pathlen + namelen + 2;
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new_path = av_realloc_array(path, pathsize, sizeof *path);
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if (!new_path)
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goto exit;
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path = new_path;
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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, pathsize);
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if (!pathlen)
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goto exit;
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// Buffer is not enough in two cases:
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// 1. system directory + \ + module name
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// 2. system directory even without the module name.
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if (pathlen + namelen + 2 > pathsize) {
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pathsize = pathlen + namelen + 2;
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new_path = av_realloc_array(path, pathsize, sizeof *path);
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if (!new_path)
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goto exit;
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path = new_path;
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// Query again to handle the case #2.
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pathlen = GetSystemDirectoryW(path, pathsize);
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if (!pathlen)
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goto exit;
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}
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path[pathlen] = L'\\';
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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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if (!name_w)
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return NULL;
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module = LoadPackagedLibrary(name_w, 0);
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#else
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#define LOAD_FLAGS (LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32)
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/* filename may be be in CP_ACP */
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if (!name_w)
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return LoadLibraryExA(name, NULL, LOAD_FLAGS);
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module = LoadLibraryExW(name_w, NULL, LOAD_FLAGS);
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#undef LOAD_FLAGS
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#endif
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av_free(name_w);
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return module;
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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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