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j2kdec: merge length==0 check from jpeg2000

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-30 21:01:34 +02:00
parent f67f2681da
commit a5203d86b3
1 changed files with 4 additions and 0 deletions
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4
libavcodec/j2kdec.c
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@ -795,6 +795,10 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
for (y = 0; y < height; y++)
memset(t1->data[y], 0, width * sizeof(**t1->data));
/* If code-block contains no compressed data: nothing to do. */
if (!cblk->length)
return 0;
for (y = 0; y < height+2; y++)
memset(t1->flags[y], 0, (width + 2)*sizeof(**t1->flags));