avio: add avio_check()

The new function is more flexible than url_exist(), as it allows to
specify which access flags to check, and does not require an explicit
open of the checked resource.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/libavformat/avio.c b/libavformat/avio.c
index ad1f1b40c2..18b2ee6c22 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -374,6 +374,25 @@ int url_exist(const char *filename)
     return 1;
 }
 
+int avio_check(const char *url, int flags)
+{
+    URLContext *h;
+    int ret = ffurl_alloc(&h, url, flags);
+    if (ret)
+        return ret;
+
+    if (h->prot->url_check) {
+        ret = h->prot->url_check(h, flags);
+    } else {
+        ret = ffurl_connect(h);
+        if (ret >= 0)
+            ret = flags;
+    }
+
+    ffurl_close(h);
+    return ret;
+}
+
 int64_t ffurl_size(URLContext *h)
 {
     int64_t pos, size;