windows support: unicode filenames

Windows uses a legacy codepage for char* / runtime functions accepting
char *. Using UTF-8 as the codepage with setlocale() is explicitly
forbidden.

Work this around by overriding the MSVCRT functions with wrapper
macros, that assume UTF-8 and use "proper" API calls like _wopen etc.
to deal with unicode filenames. All code that uses standard functions
that take or return filenames must now include osdep/io.h. stat()
can't be overridden, because MinGW-w64 itself defines "stat" as a
macro. Change code to use use mp_stat() instead.

This is not perfectly clean, but still somewhat sane, and much better
than littering the rest of the mplayer code with MinGW specific hacks.
It's also a bit fragile, but that's actually little different from the
previous situation. Also, MinGW is unlikely to ever include a nice way
of dealing with this.

1 files changed, 76 insertions, 0 deletions

diff --git a/osdep/io.h b/osdep/io.h
new file mode 100644
index 0000000000..514030afca
--- /dev/null
+++ b/osdep/io.h
@@ -0,0 +1,76 @@
+/*
+ * unicode/utf-8 I/O helpers and wrappers for Windows
+ *
+ * This file is part of mplayer2.
+ *
+ * mplayer2 is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mplayer2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mplayer2.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MPLAYER_OSDEP_IO
+#define MPLAYER_OSDEP_IO
+
+#include <limits.h>
+
+#ifdef _WIN32
+#include <wchar.h>
+wchar_t *mp_from_utf8(void *talloc_ctx, const char *s);
+char *mp_to_utf8(void *talloc_ctx, const wchar_t *s);
+#endif
+
+#ifdef __MINGW32__
+
+#include <stdio.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+// Windows' MAX_PATH/PATH_MAX/FILENAME_MAX is fixed to 260, but this limit
+// applies to unicode paths encoded with wchar_t (2 bytes on Windows). The UTF-8
+// version could end up bigger in memory. In the worst case each wchar_t is
+// encoded to 3 bytes in UTF-8, so in the worst case we have:
+//      wcslen(wpath) <= strlen(utf8path) * 3
+// Thus we need MP_PATH_MAX as the UTF-8/char version of PATH_MAX.
+#define MP_PATH_MAX (FILENAME_MAX * 3)
+
+void mp_get_converted_argv(int *argc, char ***argv);
+
+int mp_stat(const char *path, struct stat *buf);
+int mp_open(const char *filename, int oflag, ...);
+int mp_creat(const char *filename, int mode);
+FILE *mp_fopen(const char *filename, const char *mode);
+DIR *mp_opendir(const char *path);
+struct dirent *mp_readdir(DIR *dir);
+int mp_closedir(DIR *dir);
+int mp_mkdir(const char *path, int mode);
+
+// NOTE: Stat is not overridden with mp_stat, because MinGW-w64 defines it as
+//       macro.
+
+#define open(...) mp_open(__VA_ARGS__)
+#define creat(...) mp_creat(__VA_ARGS__)
+#define fopen(...) mp_fopen(__VA_ARGS__)
+#define opendir(...) mp_opendir(__VA_ARGS__)
+#define readdir(...) mp_readdir(__VA_ARGS__)
+#define closedir(...) mp_closedir(__VA_ARGS__)
+#define mkdir(...) mp_mkdir(__VA_ARGS__)
+
+#else /* __MINGW32__ */
+
+#define MP_PATH_MAX PATH_MAX
+
+#define mp_stat(...) stat(__VA_ARGS__)
+
+#endif /* __MINGW32__ */
+
+#endif