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huffyuvdec: Skip len==0 cases

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Fixes vlc decoding for hypothetical files that would contain such cases.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-29 19:10:07 +01:00
parent 4420b41442
commit 0dfc01c2bb
1 changed files with 5 additions and 5 deletions
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10
libavcodec/huffyuvdec.c
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@ -120,11 +120,11 @@ static int generate_joint_tables(HYuvContext *s)
for (i = y = 0; y < 256; y++) {
int len0 = s->len[0][y];
int limit = VLC_BITS - len0;
if(limit <= 0)
if(limit <= 0 || !len0)
continue;
for (u = 0; u < 256; u++) {
int len1 = s->len[p][u];
if (len1 > limit)
if (len1 > limit || !len1)
continue;
av_assert0(i < (1 << VLC_BITS));
len[i] = len0 + len1;
@ -150,17 +150,17 @@ static int generate_joint_tables(HYuvContext *s)
for (i = 0, g = -16; g < 16; g++) {
int len0 = s->len[p0][g & 255];
int limit0 = VLC_BITS - len0;
if (limit0 < 2)
if (limit0 < 2 || !len0)
continue;
for (b = -16; b < 16; b++) {
int len1 = s->len[p1][b & 255];
int limit1 = limit0 - len1;
if (limit1 < 1)
if (limit1 < 1 || !len1)
continue;
code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
for (r = -16; r < 16; r++) {
int len2 = s->len[2][r & 255];
if (len2 > limit1)
if (len2 > limit1 || !len2)
continue;
av_assert0(i < (1 << VLC_BITS));
len[i] = len0 + len1 + len2;