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avformat/dashdec: avoid calling strlen multiple times 

Reviewed-by: Steven Liu <liuqi05@kuaishou.com>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2021-12-12 19:06:41 +08:00
parent c825de87c9
commit 1530b3f566
1 changed files with 4 additions and 2 deletions
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6
libavformat/dashdec.c
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@ -403,6 +403,7 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
DASHContext *c = s->priv_data;
AVDictionary *tmp = NULL;
const char *proto_name = NULL;
int proto_name_len;
int ret;
if (av_strstart(url, "crypto", NULL)) {
@ -416,6 +417,7 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
if (!proto_name)
return AVERROR_INVALIDDATA;
proto_name_len = strlen(proto_name);
// only http(s) & file are allowed
if (av_strstart(proto_name, "file", NULL)) {
if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
@ -430,9 +432,9 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
} else
return AVERROR_INVALIDDATA;
if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
if (!strncmp(proto_name, url, proto_name_len) && url[proto_name_len] == ':')
;
else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, proto_name_len) && url[7 + proto_name_len] == ':')
;
else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
return AVERROR_INVALIDDATA;