[FFmpeg-devel] [PATCH 3/3] avformat/dashdec: avoid calling strlen multiple times

[Steven Liu]

<lance.lmwang at gmail.com> 于2022年1月23日周日 11:52写道：
>
> From: Limin Wang <lance.lmwang at gmail.com>
>
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
>  libavformat/dashdec.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
> index 0d21989..211d77f 100644
> --- a/libavformat/dashdec.c
> +++ b/libavformat/dashdec.c
> @@ -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;
> --
> 1.8.3.1
>
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lgtm


Thanks