From 175389c85487822f1ee180ee01cc770df896557f Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Fri, 8 Apr 2011 18:32:25 +0200 Subject: 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 --- libavformat/avio.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'libavformat/avio.h') diff --git a/libavformat/avio.h b/libavformat/avio.h index a4109a2996..14aa599fe0 100644 --- a/libavformat/avio.h +++ b/libavformat/avio.h @@ -134,6 +134,7 @@ typedef struct URLProtocol { int priv_data_size; const AVClass *priv_data_class; int flags; + int (*url_check)(URLContext *h, int mask); } URLProtocol; typedef struct URLPollEntry { @@ -346,6 +347,23 @@ attribute_deprecated int url_close_buf(AVIOContext *s); */ int url_exist(const char *url); +/** + * Return AVIO_* access flags corresponding to the access permissions + * of the resource in url, or a negative value corresponding to an + * AVERROR code in case of failure. The returned access flags are + * masked by the value in flags. + * + * @note This function is intrinsically unsafe, in the sense that the + * checked resource may change its existence or permission status from + * one call to another. Thus you should not trust the returned value, + * unless you are sure that no other processes are accessing the + * checked resource. + * + * @note This function is slightly broken until next major bump + * because of AVIO_RDONLY == 0. Don't use it until then. + */ +int avio_check(const char *url, int flags); + /** * The callback is called in blocking functions to test regulary if * asynchronous interruption is needed. AVERROR_EXIT is returned -- cgit v1.2.3