[FFmpeg-cvslog] Make ff_win32_open more robust.

Reimar Döffinger git at videolan.org
Sat Mar 16 13:43:31 CET 2013


ffmpeg | branch: master | Reimar Döffinger <Reimar.Doeffinger at gmx.de> | Sun Mar 10 20:03:19 2013 +0100| [c3c3bc7ff6b25326800ef6aae3ba46f9de75d3a7] | committer: Reimar Döffinger

Make ff_win32_open more robust.

- Make MultiByteToWideChar fail when it encounters invalid encoding.
  Without this, invalid characters might just be skipped
- When MultiByteToWideChar fails, assume the file name is in CP_ACP
  and open it via normal open function, even when the file will be
  written
- When malloc fails return error instead of crashing

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger at gmx.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c3c3bc7ff6b25326800ef6aae3ba46f9de75d3a7
---

 libavformat/os_support.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/libavformat/os_support.c b/libavformat/os_support.c
index 15cf753..0a901f6 100644
--- a/libavformat/os_support.c
+++ b/libavformat/os_support.c
@@ -44,20 +44,23 @@ int ff_win32_open(const char *filename_utf8, int oflag, int pmode)
     wchar_t *filename_w;
 
     /* convert UTF-8 to wide chars */
-    num_chars = MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, NULL, 0);
+    num_chars = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, filename_utf8, -1, NULL, 0);
     if (num_chars <= 0)
-        return -1;
+        goto fallback;
     filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
+    if (!filename_w)
+        return -1;
     MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, filename_w, num_chars);
 
     fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
     av_freep(&filename_w);
 
-    /* filename maybe be in CP_ACP */
-    if (fd == -1 && !(oflag & O_CREAT))
-        return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
+    if (fd != -1 || (oflag & O_CREAT))
+        return fd;
 
-    return fd;
+fallback:
+    /* filename maybe be in CP_ACP */
+    return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
 }
 #endif
 



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