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some minimal unsafe seems to yeld ~10%

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Robin Appelman 2023-03-08 23:18:08 +01:00
commit 41d558ecb0
1 changed files with 13 additions and 3 deletions
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16
src/common.rs
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@ -326,8 +326,15 @@ impl Serialize for SteamId3 {
}
pub fn split_once(input: &str, delim: u8, offset: usize) -> Result<(&str, &str)> {
debug_assert!(delim < 128); // only basic ascii
let end = memchr(delim, input.as_bytes()).ok_or(Error::Incomplete)?;
Ok((&input[..end], &input[(end + offset)..]))
// safety, memchr returns indices that are inside the input length and we only split on ascii
Ok(unsafe {
(
input.get_unchecked(..end),
input.get_unchecked(end + offset..),
)
})
}
pub fn skip(input: &str, count: usize) -> Result<&str> {
@ -336,16 +343,19 @@ pub fn skip(input: &str, count: usize) -> Result<&str> {
pub fn skip_matches(input: &str, char: u8) -> (&str, bool) {
if input.as_bytes().get(0) == Some(&char) {
(&input[1..], true)
// safety, we verified that the input has a length of at least 1
(unsafe { input.get_unchecked(1..) }, true)
} else {
(input, false)
}
}
pub fn find_between_end(input: &str, start: u8, end: u8) -> Option<&str> {
debug_assert!(start < 128 && end < 128); // only basic ascii
let end = memrchr(end, input.as_bytes())?;
let start = memrchr(start, &input.as_bytes()[0..end])?;
Some(&input[(start + 1)..end])
// safety, memchr returns indices that are inside the input length and we only split on ascii
Some(unsafe { input.get_unchecked((start + 1)..end) })
}
#[test]