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, 44 insertions, 0 deletions

diff --git a/libavutil/wchar_filename.h b/libavutil/wchar_filename.h
new file mode 100644
index 0000000000..2781773dee
--- /dev/null
+++ b/libavutil/wchar_filename.h
@@ -0,0 +1,44 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_WCHAR_FILENAME_H
+#define AVUTIL_WCHAR_FILENAME_H
+
+#if defined(_WIN32) && !defined(__MINGW32CE__)
+#include <windows.h>
+#include "mem.h"
+
+static inline int utf8towchar(const char *filename_utf8, wchar_t **filename_w)
+{
+    int num_chars;
+    num_chars = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, filename_utf8, -1, NULL, 0);
+    if (num_chars <= 0) {
+        *filename_w = NULL;
+        return 0;
+    }
+    *filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
+    if (!*filename_w) {
+        errno = ENOMEM;
+        return -1;
+    }
+    MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, *filename_w, num_chars);
+    return 0;
+}
+#endif
+
+#endif /* AVUTIL_WCHAR_FILENAME_H */