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avformat/apngdec: Remove goto fail that does nothing 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2019-12-11 12:15:05 +01:00
parent d9363b56a6
commit 158265b439
1 changed files with 12 additions and 20 deletions
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32
libavformat/apngdec.c
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@ -151,17 +151,17 @@ static int apng_read_header(AVFormatContext *s)
uint32_t len, tag;
AVStream *st;
int acTL_found = 0;
int64_t ret = AVERROR_INVALIDDATA;
int64_t ret;
/* verify PNGSIG */
if (avio_rb64(pb) != PNGSIG)
return ret;
return AVERROR_INVALIDDATA;
/* parse IHDR (must be first chunk) */
len = avio_rb32(pb);
tag = avio_rl32(pb);
if (len != 13 || tag != MKTAG('I', 'H', 'D', 'R'))
return ret;
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
@ -193,11 +193,9 @@ static int apng_read_header(AVFormatContext *s)
int64_t size = avio_size(pb);
int64_t offset = avio_tell(pb);
if (size < 0) {
ret = size;
goto fail;
return size;
} else if (offset < 0) {
ret = offset;
goto fail;
return offset;
} else if ((ret = ffio_ensure_seekback(pb, size - offset)) < 0) {
av_log(s, AV_LOG_WARNING, "Could not ensure seekback, will not loop\n");
ctx->num_play = 1;
@ -205,20 +203,18 @@ static int apng_read_header(AVFormatContext *s)
}
if ((ctx->num_play == 1 || !acTL_found) &&
((ret = ffio_ensure_seekback(pb, 4 /* len */ + 4 /* tag */)) < 0))
goto fail;
return ret;
len = avio_rb32(pb);
if (len > INT_MAX - 12) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (len > INT_MAX - 12)
return AVERROR_INVALIDDATA;
tag = avio_rl32(pb);
switch (tag) {
case MKTAG('a', 'c', 'T', 'L'):
if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
(ret = append_extradata(st->codecpar, pb, len + 12)) < 0)
goto fail;
return ret;
acTL_found = 1;
ctx->num_frames = AV_RB32(st->codecpar->extradata + ret + 8);
ctx->num_play = AV_RB32(st->codecpar->extradata + ret + 12);
@ -227,21 +223,17 @@ static int apng_read_header(AVFormatContext *s)
break;
case MKTAG('f', 'c', 'T', 'L'):
if (!acTL_found || len != 26) {
ret = AVERROR_INVALIDDATA;
goto fail;
return AVERROR_INVALIDDATA;
}
if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0)
goto fail;
return ret;
return 0;
default:
if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
(ret = append_extradata(st->codecpar, pb, len + 12)) < 0)
goto fail;
return ret;
}
}
fail:
return ret;
}
static int decode_fctl_chunk(AVFormatContext *s, APNGDemuxContext *ctx, AVPacket *pkt)