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Administrator
Magisk
Commits
e1b63d7d
Commit
e1b63d7d
authored
Nov 16, 2021
by
topjohnwu
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Initialize mt19937 statically in function
This reduces startup time
parent
4b5651bd
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with
5 additions
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9 deletions
+5
-9
misc.cpp
native/jni/utils/misc.cpp
+5
-9
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native/jni/utils/misc.cpp
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e1b63d7d
...
...
@@ -33,21 +33,17 @@ int fork_no_orphan() {
return
0
;
}
constexpr
char
ALPHANUM
[]
=
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
;
static
bool
seeded
=
false
;
static
std
::
mt19937
gen
;
static
std
::
uniform_int_distribution
<
int
>
dist
(
0
,
sizeof
(
ALPHANUM
)
-
2
);
int
gen_rand_str
(
char
*
buf
,
int
len
,
bool
varlen
)
{
if
(
!
seeded
)
{
constexpr
char
ALPHANUM
[]
=
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
;
static
std
::
mt19937
gen
([]{
if
(
access
(
"/dev/urandom"
,
F_OK
)
!=
0
)
mknod
(
"/dev/urandom"
,
0600
|
S_IFCHR
,
makedev
(
1
,
9
));
int
fd
=
xopen
(
"/dev/urandom"
,
O_RDONLY
|
O_CLOEXEC
);
unsigned
seed
;
xxread
(
fd
,
&
seed
,
sizeof
(
seed
));
gen
.
seed
(
seed
);
close
(
fd
);
seeded
=
true
;
}
return
seed
;
}());
std
::
uniform_int_distribution
<
int
>
dist
(
0
,
sizeof
(
ALPHANUM
)
-
2
);
if
(
varlen
)
{
std
::
uniform_int_distribution
<
int
>
len_dist
(
len
/
2
,
len
);
len
=
len_dist
(
gen
);
...
...
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