wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-27 00:11:17 +02:00
Code Activity

Speed up StorePath::to_string()

Browse source 
1.81% -> 0.56%
This commit is contained in:
Eelco Dolstra 2019-12-10 20:48:36 +01:00
parent f64b58b45e
commit f800d450b7
3 changed files with 24 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

19
nix-rust/src/util/base32.rs
View file

@ -25,27 +25,36 @@ lazy_static! {
}
pub fn encode(input: &[u8]) -> String {
let mut res = String::new();
res.reserve(encoded_len(input.len()));
let mut buf = vec![0; encoded_len(input.len())];
encode_into(input, &mut buf);
std::str::from_utf8(&buf).unwrap().to_string()
}
pub fn encode_into(input: &[u8], output: &mut [u8]) {
let len = encoded_len(input.len());
assert_eq!(len, output.len());
let mut nr_bits_left: usize = 0;
let mut bits_left: u16 = 0;
let mut pos = len;
for b in input {
bits_left |= (*b as u16) << nr_bits_left;
nr_bits_left += 8;
while nr_bits_left > 5 {
res.push(BASE32_CHARS[(bits_left & 0x1f) as usize] as char);
output[pos - 1] = BASE32_CHARS[(bits_left & 0x1f) as usize];
pos -= 1;
bits_left >>= 5;
nr_bits_left -= 5;
}
}
if nr_bits_left > 0 {
res.push(BASE32_CHARS[(bits_left & 0x1f) as usize] as char);
output[pos - 1] = BASE32_CHARS[(bits_left & 0x1f) as usize];
pos -= 1;
}
res.chars().rev().collect()
assert_eq!(pos, 0);
}
pub fn decode(input: &str) -> Result<Vec<u8>, crate::Error> {