/*

  * various OS-feature replacement utilities

  * copyright (c) 2000, 2001, 2002 Fabrice Bellard
  *

  * 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 AVFORMAT_OS_SUPPORT_H
 #define AVFORMAT_OS_SUPPORT_H

 
 /**

  * @file

  * miscellaneous OS support macros and functions.
  */
 

 #include "config.h"
 

 #include <sys/stat.h>
 

 #ifdef _WIN32
 #if HAVE_DIRECT_H
 #include <direct.h>
 #endif
 #if HAVE_IO_H
 #include <io.h>
 #endif
 #endif
 

 #if defined(_WIN32) && !defined(__MINGW32CE__)

 #  include <fcntl.h>

 #  ifdef lseek
 #   undef lseek
 #  endif

 #  define lseek(f,p,w) _lseeki64((f), (p), (w))

 #  ifdef stat
 #   undef stat
 #  endif

 #  define stat _stati64

 #  ifdef fstat
 #   undef fstat
 #  endif

 #  define fstat(f,s) _fstati64((f), (s))

 #endif /* defined(_WIN32) && !defined(__MINGW32CE__) */

 #ifdef __ANDROID__

 #  if HAVE_UNISTD_H
 #    include <unistd.h>
 #  endif

 #  ifdef lseek
 #   undef lseek
 #  endif
 #  define lseek(f,p,w) lseek64((f), (p), (w))
 #endif
 

 static inline int is_dos_path(const char *path)
 {

 #if HAVE_DOS_PATHS

     if (path[0] && path[1] == ':')
         return 1;
 #endif
     return 0;
 }
 

 #if defined(__OS2__) || defined(__Plan9__)

 #define SHUT_RD 0
 #define SHUT_WR 1
 #define SHUT_RDWR 2
 #endif
 

 #if defined(_WIN32)
 #define SHUT_RD SD_RECEIVE
 #define SHUT_WR SD_SEND
 #define SHUT_RDWR SD_BOTH

 
 #ifndef S_IRUSR
 #define S_IRUSR S_IREAD
 #endif
 #ifndef S_IWUSR
 #define S_IWUSR S_IWRITE
 #endif

 #endif
 

 #if CONFIG_NETWORK
 #if !HAVE_SOCKLEN_T

 typedef int socklen_t;
 #endif

 /* most of the time closing a socket is just closing an fd */

 #if !HAVE_CLOSESOCKET

 #define closesocket close
 #endif
 

 #if !HAVE_POLL_H

 typedef unsigned long nfds_t;
 

 #if HAVE_WINSOCK2_H
 #include <winsock2.h>
 #endif
 #if !HAVE_STRUCT_POLLFD

 struct pollfd {
     int fd;
     short events;  /* events to look for */

     short revents; /* events that occurred */

 };
 
 /* events & revents */
 #define POLLIN     0x0001  /* any readable data available */
 #define POLLOUT    0x0002  /* file descriptor is writeable */
 #define POLLRDNORM POLLIN
 #define POLLWRNORM POLLOUT
 #define POLLRDBAND 0x0008  /* priority readable data */
 #define POLLWRBAND 0x0010  /* priority data can be written */
 #define POLLPRI    0x0020  /* high priority readable data */
 
 /* revents only */
 #define POLLERR    0x0004  /* errors pending */
 #define POLLHUP    0x0080  /* disconnected */
 #define POLLNVAL   0x1000  /* invalid file descriptor */

 #endif

 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
 #define poll ff_poll

 #endif /* HAVE_POLL_H */

 #endif /* CONFIG_NETWORK */

 #if defined(__MINGW32CE__)
 #define mkdir(a, b) _mkdir(a)
 #elif defined(_WIN32)
 #include <stdio.h>
 #include <windows.h>

 #include "libavutil/wchar_filename.h"

 #ifdef WINAPI_FAMILY
 #include <winapifamily.h>
 // If a WINAPI_FAMILY is defined, check that the desktop API subset
 // is enabled
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
 #define USE_MOVEFILEEXA
 #endif
 #else
 // If no WINAPI_FAMILY is defined, assume the full API subset
 #define USE_MOVEFILEEXA
 #endif
 

 #define DEF_FS_FUNCTION(name, wfunc, afunc)               \
 static inline int win32_##name(const char *filename_utf8) \
 {                                                         \
     wchar_t *filename_w;                                  \
     int ret;                                              \
                                                           \
     if (utf8towchar(filename_utf8, &filename_w))          \
         return -1;                                        \
     if (!filename_w)                                      \
         goto fallback;                                    \
                                                           \
     ret = wfunc(filename_w);                              \
     av_free(filename_w);                                  \
     return ret;                                           \
                                                           \
 fallback:                                                 \
     /* filename may be be in CP_ACP */                    \
     return afunc(filename_utf8);                          \
 }
 
 DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
 DEF_FS_FUNCTION(mkdir,  _wmkdir,  _mkdir)
 DEF_FS_FUNCTION(rmdir,  _wrmdir , _rmdir)
 
 static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
 {
     wchar_t *src_w, *dest_w;
     int ret;
 
     if (utf8towchar(src_utf8, &src_w))
         return -1;
     if (utf8towchar(dest_utf8, &dest_w)) {
         av_free(src_w);
         return -1;
     }
     if (!src_w || !dest_w) {
         av_free(src_w);
         av_free(dest_w);
         goto fallback;
     }
 

     ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);

     av_free(src_w);
     av_free(dest_w);

     // Lacking proper mapping from GetLastError() error codes to errno codes
     if (ret)
         errno = EPERM;

     return ret;
 
 fallback:
     /* filename may be be in CP_ACP */

 #ifdef USE_MOVEFILEEXA

     ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
     if (ret)
         errno = EPERM;
 #else

     /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
      * it is available but not allowed by the app certification kit. However,
      * it's unlikely that anybody would input filenames in CP_ACP there, so this

      * fallback is kept mostly for completeness. Alternatively we could
      * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
      * explicit conversions with CP_ACP is allegedly forbidden in windows
      * store apps (or windows phone), and the notion of a native code page
      * doesn't make much sense there. */
     ret = rename(src_utf8, dest_utf8);
 #endif
     return ret;

 }
 
 #define mkdir(a, b) win32_mkdir(a)
 #define rename      win32_rename
 #define rmdir       win32_rmdir
 #define unlink      win32_unlink
 
 #endif
 

 #endif /* AVFORMAT_OS_SUPPORT_H */