[FFmpeg-devel] [PATCH] avutil/avstring: add a "ALL" entry and the possibility to negate matches to av_match_name()

[Michael Niedermayer]

This will extend the whitelist features to allow blacklisting individual protocols and to
explicitly force everything to be enabled.

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavutil/avstring.c |   15 ++++++++++-----
 libavutil/avstring.h |    5 +++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/libavutil/avstring.c b/libavutil/avstring.c
index 57fe74d..85fb3e9 100644
--- a/libavutil/avstring.c
+++ b/libavutil/avstring.c
@@ -326,13 +326,18 @@ int av_match_name(const char *name, const char *names)
         return 0;
 
     namelen = strlen(name);
-    while ((p = strchr(names, ','))) {
+    while (*names) {
+        int negate = '-' == *names;
+        p = strchr(names, ',');
+        if (!p)
+            p = names + strlen(names);
+        names += negate;
         len = FFMAX(p - names, namelen);
-        if (!av_strncasecmp(name, names, len))
-            return 1;
-        names = p + 1;
+        if (!av_strncasecmp(name, names, len) || !strncmp("ALL", names, FFMAX(3, p - names)))
+            return !negate;
+        names = p + (*p == ',');
     }
-    return !av_strcasecmp(name, names);
+    return 0;
 }
 
 int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,
diff --git a/libavutil/avstring.h b/libavutil/avstring.h
index a46d012..ea08d4f 100644
--- a/libavutil/avstring.h
+++ b/libavutil/avstring.h
@@ -284,6 +284,11 @@ const char *av_dirname(char *path);
 
 /**
  * Match instances of a name in a comma-separated list of names.
+ * List entries are checked from 0 to the end of the names list,
+ * the first match ends further proessing. If a entry prefixed with '-'
+ * matches than 0 is returned. the "ALL" list entry is considered to
+ * match all names.
+ *
  * @param name  Name to look for.
  * @param names List of names.
  * @return 1 on match, 0 otherwise.
-- 
1.7.9.5