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fast32/src/base64/decode_u64.rs at main · rogusdev/fast32 · GitHub
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fast32
/
src
/
base64
/
decode_u64.rs
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111 lines (109 loc) · 4.25 KB
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fast32
/
src
/
base64
/
decode_u64.rs
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use
crate
::
shared
::
{
bits_or_err_u64
,
DecodeError
}
;
use
super
::
alphabet
::
{
WIDTH_1
,
WIDTH_10
,
WIDTH_2
,
WIDTH_3
,
WIDTH_4
,
WIDTH_5
,
WIDTH_6
,
WIDTH_7
,
WIDTH_8
,
WIDTH_9
,
}
;
/// Decode byte array with given decoding, into a u64
///
/// Examples:
/// ```
/// use fast32::base64::RFC4648_NOPAD;
/// assert_eq!(RFC4648_NOPAD.decode_u64(b"f").unwrap(), 31);
/// ```
///
/// Returns [`DecodeError`] if input to decode is invalid
#
[
rustfmt
::
skip
]
pub
fn
decode_u64
(
dec
:
&
'
static
[
u8
;
256
]
,
a
:
&
[
u8
]
)
->
Result
<
u64
,
DecodeError
>
{
let
n =
match
a
.
len
(
)
{
11
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_10
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_9
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_8
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_7
|
bits_or_err_u64
(
dec
,
a
,
4
)
? <<
WIDTH_6
|
bits_or_err_u64
(
dec
,
a
,
5
)
? <<
WIDTH_5
|
bits_or_err_u64
(
dec
,
a
,
6
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
7
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
8
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
9
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
10
)
?
}
10
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_9
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_8
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_7
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_6
|
bits_or_err_u64
(
dec
,
a
,
4
)
? <<
WIDTH_5
|
bits_or_err_u64
(
dec
,
a
,
5
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
6
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
7
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
8
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
9
)
?
}
9
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_8
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_7
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_6
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_5
|
bits_or_err_u64
(
dec
,
a
,
4
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
5
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
6
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
7
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
8
)
?
}
8
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_7
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_6
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_5
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
4
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
5
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
6
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
7
)
?
}
7
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_6
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_5
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
4
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
5
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
6
)
?
}
6
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_5
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
4
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
5
)
?
}
5
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_4
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
3
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
4
)
?
}
4
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_3
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
2
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
3
)
?
}
3
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_2
|
bits_or_err_u64
(
dec
,
a
,
1
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
2
)
?
}
2
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
? <<
WIDTH_1
|
bits_or_err_u64
(
dec
,
a
,
1
)
?
}
1
=>
{
bits_or_err_u64
(
dec
,
a
,
0
)
?
}
0
=>
0
,
len @ _ =>
Err
(
DecodeError
::
InvalidLength
{
length
:
len
}
)
?
,
}
;
Ok
(
n
)
}
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