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avcodec/golomb: get_ur_golomb_jpegls: Fix reading huge k values 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit c720b9ce98)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-05-17 19:07:17 +02:00
parent 10b77a3471
commit 8b95fc6d8d
1 changed files with 10 additions and 2 deletions
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12
libavcodec/golomb.h
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@ -346,8 +346,16 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,
if (i < limit - 1) { if (i < limit - 1) {
if (k) { if (k) {
buf = SHOW_UBITS(re, gb, k); if (k > MIN_CACHE_BITS - 1) {
LAST_SKIP_BITS(re, gb, k); buf = SHOW_UBITS(re, gb, 16) << (k-16);
LAST_SKIP_BITS(re, gb, 16);
UPDATE_CACHE(re, gb);
buf |= SHOW_UBITS(re, gb, k-16);
LAST_SKIP_BITS(re, gb, k-16);
} else {
buf = SHOW_UBITS(re, gb, k);
LAST_SKIP_BITS(re, gb, k);
}
} else { } else {
buf = 0; buf = 0;
} }