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avformat/webpenc: Check seeks

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Addresses the issue reported in ticket #4609.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2023-10-06 03:55:31 +02:00
parent e920a84801
commit 155f0c8ef7
1 changed files with 7 additions and 6 deletions
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13
libavformat/webpenc.c
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@ -177,8 +177,8 @@ static int webp_write_trailer(AVFormatContext *s)
if (w->using_webp_anim_encoder) { if (w->using_webp_anim_encoder) {
if (w->loop) { // Write loop count. if (w->loop) { // Write loop count.
avio_seek(s->pb, 42, SEEK_SET); if (avio_seek(s->pb, 42, SEEK_SET) == 42)
avio_wl16(s->pb, w->loop); avio_wl16(s->pb, w->loop);
} }
} else { } else {
int ret; int ret;
@ -186,10 +186,11 @@ static int webp_write_trailer(AVFormatContext *s)
return ret; return ret;
filesize = avio_tell(s->pb); filesize = avio_tell(s->pb);
avio_seek(s->pb, 4, SEEK_SET); if (avio_seek(s->pb, 4, SEEK_SET) == 4) {
avio_wl32(s->pb, filesize - 8); avio_wl32(s->pb, filesize - 8);
// Note: without the following, avio only writes 8 bytes to the file. // Note: without the following, avio only writes 8 bytes to the file.
avio_seek(s->pb, filesize, SEEK_SET); avio_seek(s->pb, filesize, SEEK_SET);
}
} }
return 0; return 0;