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AsciiBitmap

This commit is contained in:
Ali MJ Al-Nasrawy 2022-03-28 22:40:12 +03:00
parent 3718037106
commit a2dabfce10
1 changed files with 23 additions and 16 deletions
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39
actix-router/src/quoter.rs
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@ -19,7 +19,7 @@ mod charsets {
/// Partial Percent-decoding. /// Partial Percent-decoding.
pub struct Quoter { pub struct Quoter {
/// Simple bit-map of protected values in the 0-127 ASCII range. /// Simple bit-map of protected values in the 0-127 ASCII range.
protected_table: [u8; 16], protected_table: AsciiBitmap,
} }
impl Quoter { impl Quoter {
@ -30,11 +30,11 @@ impl Quoter {
/// # Panic /// # Panic
/// Panics if any of the `protected` bytes is not in the 0-127 ASCII range. /// Panics if any of the `protected` bytes is not in the 0-127 ASCII range.
pub fn new(_: &[u8], protected: &[u8]) -> Quoter { pub fn new(_: &[u8], protected: &[u8]) -> Quoter {
let mut protected_table = [0; 16]; let mut protected_table = AsciiBitmap::default();
// prepare protected table // prepare protected table
for &ch in protected { for &ch in protected {
set_bit(&mut protected_table, ch); protected_table.set_bit(ch);
} }
Quoter { protected_table } Quoter { protected_table }
@ -47,7 +47,7 @@ impl Quoter {
if let (prev, [b'%', p1, p2, rem @ ..]) = val.split_at(i) { if let (prev, [b'%', p1, p2, rem @ ..]) = val.split_at(i) {
if let Some(ch) = hex_pair_to_char(*p1, *p2) if let Some(ch) = hex_pair_to_char(*p1, *p2)
// ignore protected ascii bytes // ignore protected ascii bytes
.filter(|&ch| !(ch < 128 && bit_at(&self.protected_table, ch))) .filter(|&ch| !(ch < 128 && self.protected_table.bit_at(ch)))
{ {
*val = rem; *val = rem;
return Some((prev, ch)); return Some((prev, ch));
@ -106,20 +106,27 @@ fn hex_pair_to_char(d1: u8, d2: u8) -> Option<u8> {
Some((d_high as u8) << 4 | (d_low as u8)) Some((d_high as u8) << 4 | (d_low as u8))
} }
/// Sets bit in given bit-map to 1=true. #[derive(Debug, Default, Clone)]
/// struct AsciiBitmap {
/// # Panics array: [u8; 16],
/// Panics if `ch` index is out of bounds.
fn set_bit(array: &mut [u8], ch: u8) {
array[(ch >> 3) as usize] |= 0b1 << (ch & 0b111)
} }
/// Returns true if bit to true in given bit-map. impl AsciiBitmap {
/// /// Sets bit in given bit-map to 1=true.
/// # Panics ///
/// Panics if `ch` index is out of bounds. /// # Panics
fn bit_at(array: &[u8; 16], ch: u8) -> bool { /// Panics if `ch` index is out of bounds.
array[(ch >> 3) as usize] & (0b1 << (ch & 0b111)) != 0 fn set_bit(&mut self, ch: u8) {
self.array[(ch >> 3) as usize] |= 0b1 << (ch & 0b111)
}
/// Returns true if bit to true in given bit-map.
///
/// # Panics
/// Panics if `ch` index is out of bounds.
fn bit_at(&self, ch: u8) -> bool {
self.array[(ch >> 3) as usize] & (0b1 << (ch & 0b111)) != 0
}
} }
#[cfg(test)] #[cfg(test)]