Share the utf8 to wchar conversion routine between lavf and lavu

This doesn't add any dependency on library internals, since this
only is a static inline function that gets built into each of the
calling functions - this is only to reduce the code duplication.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 4 insertions, 9 deletions

diff --git a/libavutil/file_open.c b/libavutil/file_open.c
index 765eb60ef3..f14ea70862 100644
--- a/libavutil/file_open.c
+++ b/libavutil/file_open.c
@@ -37,23 +37,18 @@
 #include <windows.h>
 #include <share.h>
 #include <errno.h>
+#include "wchar_filename.h"
 
 static int win32_open(const char *filename_utf8, int oflag, int pmode)
 {
     int fd;
-    int num_chars;
     wchar_t *filename_w;
 
     /* convert UTF-8 to wide chars */
-    num_chars = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, filename_utf8, -1, NULL, 0);
-    if (num_chars <= 0)
-        goto fallback;
-    filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
-    if (!filename_w) {
-        errno = ENOMEM;
+    if (utf8towchar(filename_utf8, &filename_w))
         return -1;
-    }
-    MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, filename_w, num_chars);
+    if (!filename_w)
+        goto fallback;
 
     fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
     av_freep(&filename_w);