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Third Party Harfbuzz
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f7600228
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Third Party Harfbuzz
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f7600228
编写于
1月 12, 2018
作者:
B
Behdad Esfahbod
浏览文件
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电子邮件补丁
差异文件
[aat] Detect infinite-loops in state machine
上级
d514f148
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
29 addition
and
7 deletion
+29
-7
src/hb-aat-layout-common-private.hh
src/hb-aat-layout-common-private.hh
+29
-7
未找到文件。
src/hb-aat-layout-common-private.hh
浏览文件 @
f7600228
...
@@ -614,15 +614,23 @@ struct StateTableDriver
...
@@ -614,15 +614,23 @@ struct StateTableDriver
machine
(
machine_
),
machine
(
machine_
),
buffer
(
buffer_
),
buffer
(
buffer_
),
num_glyphs
(
face_
->
get_num_glyphs
()),
num_glyphs
(
face_
->
get_num_glyphs
()),
state
(
0
),
last_zero
(
0
)
last_zero
(
0
)
{}
{
dont_advance_set
.
init
();
}
inline
~
StateTableDriver
(
void
)
{
dont_advance_set
.
finish
();
}
template
<
typename
context_t
>
template
<
typename
context_t
>
inline
void
drive
(
context_t
*
c
)
inline
void
drive
(
context_t
*
c
)
{
{
hb_glyph_info_t
*
info
=
buffer
->
info
;
hb_glyph_info_t
*
info
=
buffer
->
info
;
unsigned
int
count
=
buffer
->
len
;
unsigned
int
count
=
buffer
->
len
;
unsigned
int
state
=
0
;
bool
last_was_dont_advance
=
false
;
for
(
buffer
->
idx
=
0
;
buffer
->
idx
<=
count
;
buffer
->
idx
++
)
for
(
buffer
->
idx
=
0
;
buffer
->
idx
<=
count
;
buffer
->
idx
++
)
{
{
if
(
!
state
)
if
(
!
state
)
...
@@ -637,8 +645,22 @@ struct StateTableDriver
...
@@ -637,8 +645,22 @@ struct StateTableDriver
c
->
transition
(
this
,
entry
);
c
->
transition
(
this
,
entry
);
if
(
entry
->
flags
&
context_t
::
DontAdvance
)
if
(
entry
->
flags
&
context_t
::
DontAdvance
)
buffer
->
idx
--
;
/* TODO Detect infinite loop. */
{
if
(
!
last_was_dont_advance
)
dont_advance_set
.
clear
();
unsigned
int
key
=
info
[
buffer
->
idx
].
codepoint
|
(
state
<<
16
);
if
(
likely
(
!
dont_advance_set
.
has
(
key
)))
{
dont_advance_set
.
add
(
key
);
buffer
->
idx
--
;
last_was_dont_advance
=
true
;
}
}
else
last_was_dont_advance
=
false
;
state
=
entry
->
newState
;
state
=
entry
->
newState
;
}
}
...
@@ -649,11 +671,11 @@ struct StateTableDriver
...
@@ -649,11 +671,11 @@ struct StateTableDriver
public:
public:
const
StateTable
<
EntryData
>
&
machine
;
const
StateTable
<
EntryData
>
&
machine
;
hb_buffer_t
*
buffer
;
hb_buffer_t
*
buffer
;
unsigned
int
num_glyphs
;
unsigned
int
num_glyphs
;
unsigned
int
state
;
unsigned
int
last_zero
;
unsigned
int
last_zero
;
private:
hb_set_t
dont_advance_set
;
/* Infinite-loop detection */
};
};
...
...
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