[PATCH] file: implement url_check() callback in the file and pipe protocols

[Stefano Sabatini]

---
 libavformat/file.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/libavformat/file.c b/libavformat/file.c
index b8c7c4c..f939a8e 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -94,6 +94,20 @@ static int file_close(URLContext *h)
     return close(fd);
 }
 
+static int file_check(URLContext *h, int mask)
+{
+    struct stat st;
+    int ret = stat(h->filename, &st);
+    if (ret < 0)
+        return AVERROR(errno);
+
+    ret |= st.st_mode&S_IRUSR ? mask&AVIO_RDONLY : 0;
+    ret |= st.st_mode&S_IWUSR ? mask&AVIO_WRONLY : 0;
+    ret |= st.st_mode&S_IWUSR && st.st_mode&S_IRUSR ? mask&AVIO_RDWR : 0;
+
+    return ret;
+}
+
 URLProtocol ff_file_protocol = {
     "file",
     file_open,
@@ -102,6 +116,7 @@ URLProtocol ff_file_protocol = {
     file_seek,
     file_close,
     .url_get_file_handle = file_get_handle,
+    .url_check = file_check,
 };
 
 #endif /* CONFIG_FILE_PROTOCOL */
@@ -136,6 +151,7 @@ URLProtocol ff_pipe_protocol = {
     file_read,
     file_write,
     .url_get_file_handle = file_get_handle,
+    .url_check = file_check,
 };
 
 #endif /* CONFIG_PIPE_PROTOCOL */
-- 
1.7.2.3


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