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|
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
pub struct HalfBytesMask(pub [u8; 16]);
#[allow(clippy::as_conversions, clippy::zero_prefixed_literal)]
impl HalfBytesMask {
pub const B32_REVSHA256: HalfBytesMask =
HalfBytesMask([0, 0, 0, 0, 0, 0, 255, 3, 0, 0, 0, 0, 222, 127, 207, 7]);
pub const B64_BLAKE2B256: HalfBytesMask = HalfBytesMask([
0, 0, 0, 0, 0, 8, 255, 3, 254, 255, 255, 135, 254, 255, 255, 7,
]);
pub const DFL_REST: HalfBytesMask = HalfBytesMask([
0, 0, 0, 0, 0, 104, 255, 163, 254, 255, 255, 135, 254, 255, 255, 7,
]);
#[inline]
pub const fn from_expanded(x: [bool; 128]) -> Self {
let mut ret = [0u8; 16];
let mut idx = 0;
while idx < 16 {
let fin = idx * 8;
let mut idx2 = 0;
while idx2 < 8 {
if x[fin + idx2] {
ret[idx] += (1 << idx2) as u8;
}
idx2 += 1;
}
idx += 1;
}
Self(ret)
}
/// create a mask by allowing all characters via the mask which are included in the given string
pub fn from_bytes(s: &[u8]) -> Self {
s.iter().fold(Self([0u8; 16]), |mut ret, &i| {
ret.set(i, true);
ret
})
}
pub const fn into_expanded(self) -> [bool; 128] {
let Self(ihbm) = self;
let mut ret = [false; 128];
let mut idx = 0;
while idx < 16 {
let fin = idx * 8;
let curi = ihbm[idx];
let mut idx2 = 0;
while idx2 < 8 {
ret[fin + idx2] = (curi >> idx2) & 0b1 != 0;
idx2 += 1;
}
idx += 1;
}
ret
}
pub fn contains(&self, byte: u8) -> bool {
if byte >= 0x80 {
false
} else {
(self.0[usize::from(byte / 8)] >> u32::from(byte % 8)) & 0b1 != 0
}
}
pub fn set(&mut self, byte: u8, allow: bool) {
if byte >= 0x80 {
if cfg!(debug_assertions) {
panic!(
"tried to manipulate invalid byte {:?} in HalfBytesMask",
byte
);
} else {
return;
}
}
let block = &mut self.0[usize::from(byte / 8)];
let bitpat = (1 << u32::from(byte % 8)) as u8;
if allow {
*block |= bitpat;
} else {
*block &= !bitpat;
}
}
#[cfg(test)]
fn count_ones(&self) -> u8 {
self.0
.iter()
.map(|i| i.count_ones())
.sum::<u32>()
.try_into()
.unwrap()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn maskbase() {
assert_eq!(HalfBytesMask::B32_REVSHA256.count_ones(), 32);
assert_eq!(HalfBytesMask::B64_BLAKE2B256.count_ones(), 64);
}
#[test]
fn non_ascii() {
for i in 0x80..=0xff {
assert!(!HalfBytesMask::DFL_REST.contains(i));
}
}
#[test]
fn dflmask() {
assert_eq!(
HalfBytesMask::from_expanded(
[
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
]
.map(|i| i != 0)
),
Default::default(),
);
assert_eq!(
HalfBytesMask::from_expanded(
[
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
]
.map(|i| i != 0)
),
HalfBytesMask::B32_REVSHA256,
);
assert_eq!(
HalfBytesMask::from_expanded(
[
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
]
.map(|i| i != 0)
),
HalfBytesMask::B64_BLAKE2B256,
);
assert_eq!(
HalfBytesMask::from_bytes(
b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-._?="
),
HalfBytesMask::DFL_REST,
);
}
}
|
