sark_core/utils/
bytes.rs

1pub struct Word;
2
3impl Word {
4    pub fn swar_eq_ci<const N: usize>(haystack: &[u8], expected: &[u8; N]) -> bool {
5        let Some(h) = haystack.first_chunk::<N>() else {
6            return false;
7        };
8        const M64: u64 = u64::from_le_bytes([0x20; 8]);
9        const M32: u32 = u32::from_le_bytes([0x20; 4]);
10        const M16: u16 = u16::from_le_bytes([0x20; 2]);
11        let mut i = 0usize;
12        while i + 8 <= N {
13            let raw = u64::from_le_bytes(h[i..i + 8].try_into().unwrap()) | M64;
14            let exp = u64::from_le_bytes(expected[i..i + 8].try_into().unwrap());
15            if raw != exp {
16                return false;
17            }
18            i += 8;
19        }
20        if i + 4 <= N {
21            let raw = u32::from_le_bytes(h[i..i + 4].try_into().unwrap()) | M32;
22            let exp = u32::from_le_bytes(expected[i..i + 4].try_into().unwrap());
23            if raw != exp {
24                return false;
25            }
26            i += 4;
27        }
28        if i + 2 <= N {
29            let raw = u16::from_le_bytes(h[i..i + 2].try_into().unwrap()) | M16;
30            let exp = u16::from_le_bytes(expected[i..i + 2].try_into().unwrap());
31            if raw != exp {
32                return false;
33            }
34            i += 2;
35        }
36        if i < N && h[i] | 0x20 != expected[i] {
37            return false;
38        }
39        true
40    }
41}
42
43pub struct Ascii;
44
45impl Ascii {
46    pub fn fold_usize(mut acc: usize, chunk: &[u8]) -> Option<usize> {
47        for &b in chunk {
48            if !b.is_ascii_digit() {
49                return None;
50            }
51            acc = acc.checked_mul(10)?.checked_add((b - b'0') as usize)?;
52        }
53        Some(acc)
54    }
55
56    pub fn fold_u64(mut acc: u64, chunk: &[u8]) -> Option<u64> {
57        for &b in chunk {
58            if !b.is_ascii_digit() {
59                return None;
60            }
61            acc = acc.checked_mul(10)?.checked_add((b - b'0') as u64)?;
62        }
63        Some(acc)
64    }
65
66    pub fn parse_usize(bytes: &[u8]) -> Option<usize> {
67        if bytes.is_empty() {
68            return None;
69        }
70        Self::fold_usize(0, bytes)
71    }
72
73    pub fn parse_u64(bytes: &[u8]) -> Option<u64> {
74        if bytes.is_empty() {
75            return None;
76        }
77        Self::fold_u64(0, bytes)
78    }
79}
sark_core/utils/bytes.rs

sark_core/utils/
bytes.rs
