ffmpeg/libavutil/file_open.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "config.h"
  20 #include "internal.h"
  21 #include "mem.h"
  22 #include <stdarg.h>
  23 #include <fcntl.h>
  24 #include <sys/stat.h>
  25 #if HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #if HAVE_IO_H
  29 #include <io.h>
  30 #endif
  31
  32 #if defined(_WIN32) && !defined(__MINGW32CE__)
  33 #undef open
  34 #undef lseek
  35 #undef stat
  36 #undef fstat
  37 #include <windows.h>
  38 #include <share.h>
  39 #include <errno.h>
  40 #include "wchar_filename.h"
  41
  42 static int win32_open(const char *filename_utf8, int oflag, int pmode)
  43 {
  44     int fd;
  45     wchar_t *filename_w;
  46
  47     /* convert UTF-8 to wide chars */
  48     if (utf8towchar(filename_utf8, &filename_w))
  49         return -1;
  50     if (!filename_w)
  51         goto fallback;
  52
  53     fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
  54     av_freep(&filename_w);
  55
  56     if (fd != -1 || (oflag & O_CREAT))
  57         return fd;
  58
  59 fallback:
  60     /* filename may be in CP_ACP */
  61     return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
  62 }
  63 #define open win32_open
  64 #endif
  65
  66 int avpriv_open(const char *filename, int flags, ...)
  67 {
  68     int fd;
  69     unsigned int mode = 0;
  70     va_list ap;
  71
  72     va_start(ap, flags);
  73     if (flags & O_CREAT)
  74         mode = va_arg(ap, unsigned int);
  75     va_end(ap);
  76
  77 #ifdef O_CLOEXEC
  78     flags |= O_CLOEXEC;
  79 #endif
  80
  81     fd = open(filename, flags, mode);
  82 #if HAVE_FCNTL
  83     if (fd != -1) {
  84         if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
  85             av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
  86     }
  87 #endif
  88
  89     return fd;
  90 }
  91
  92 FILE *av_fopen_utf8(const char *path, const char *mode)
  93 {
  94     int fd;
  95     int access;
  96     const char *m = mode;
  97
  98     switch (*m++) {
  99     case 'r': access = O_RDONLY; break;
 100     case 'w': access = O_CREAT|O_WRONLY|O_TRUNC; break;
 101     case 'a': access = O_CREAT|O_WRONLY|O_APPEND; break;
 102     default :
 103         errno = EINVAL;
 104         return NULL;
 105     }
 106     while (*m) {
 107         if (*m == '+') {
 108             access &= ~(O_RDONLY | O_WRONLY);
 109             access |= O_RDWR;
 110         } else if (*m == 'b') {
 111 #ifdef O_BINARY
 112             access |= O_BINARY;
 113 #endif
 114         } else if (*m) {
 115             errno = EINVAL;
 116             return NULL;
 117         }
 118         m++;
 119     }
 120     fd = avpriv_open(path, access, 0666);
 121     if (fd == -1)
 122         return NULL;
 123     return fdopen(fd, mode);
 124 }