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Stefan Westerfeld
ffmpeg
Commits
3a9cb188
Commit
3a9cb188
authored
Dec 01, 2015
by
Michael Niedermayer
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avutil/integer: Fix av_mod_i() with negative dividend
Signed-off-by:
Michael Niedermayer
<
michael@niedermayer.cc
>
parent
8e7f4520
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integer.c
libavutil/integer.c
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libavutil/integer.c
View file @
3a9cb188
...
...
@@ -29,6 +29,8 @@
#include "integer.h"
#include "avassert.h"
static
const
AVInteger
zero_i
;
AVInteger
av_add_i
(
AVInteger
a
,
AVInteger
b
){
int
i
,
carry
=
0
;
...
...
@@ -111,6 +113,12 @@ AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b){
AVInteger
quot_temp
;
if
(
!
quot
)
quot
=
&
quot_temp
;
if
((
int16_t
)
a
.
v
[
AV_INTEGER_SIZE
-
1
]
<
0
)
{
a
=
av_mod_i
(
quot
,
av_sub_i
(
zero_i
,
a
),
b
);
*
quot
=
av_sub_i
(
zero_i
,
*
quot
);
return
av_sub_i
(
zero_i
,
a
);
}
av_assert2
((
int16_t
)
a
.
v
[
AV_INTEGER_SIZE
-
1
]
>=
0
&&
(
int16_t
)
b
.
v
[
AV_INTEGER_SIZE
-
1
]
>=
0
);
av_assert2
(
av_log2_i
(
b
)
>=
0
);
...
...
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