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wv: make probing more robust

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-05-14 21:03:09 +00:00
parent a9cadacdd9
commit fa23f94eac
1 changed files with 5 additions and 2 deletions
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7
libavformat/wv.c
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@ -73,8 +73,11 @@ static int wv_probe(AVProbeData *p)
/* check file header */
if (p->buf_size <= 32)
return 0;
if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
p->buf[2] == 'p' && p->buf[3] == 'k')
if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
AV_RL32(&p->buf[4]) >= 24 &&
AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
AV_RL16(&p->buf[8]) >= 0x402 &&
AV_RL16(&p->buf[8]) <= 0x410)
return AVPROBE_SCORE_MAX;
else
return 0;