url-utils 0.3.0

Url Encode and Decode
Documentation 
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use alloc::{borrow::Cow, string::String};

use crate::Result;

/// UrlEncode the given string
pub fn encode(url: &str) -> Result<Cow<str>> {
    let is_ascii = |c: &u8| {
        matches!(c, b'0'..=b'9' | b'A'..=b'Z'
                  | b'a'..=b'z' | b'-' | b'.'
                  | b'_' | b'~')
    };
    let len = url.as_bytes().iter().take_while(|c| is_ascii(c)).count();
    if len >= url.len() {
        return Ok(url.into());
    }
    let mut buf = String::new();
    for byte in url.as_bytes() {
        if is_ascii(byte) {
            buf.push(*byte as char);
        } else {
            buf.push('%');
            buf.push(to_hex_digit(byte >> 4));
            buf.push(to_hex_digit(byte & 0b1111));
        }
    }
    Ok(buf.into())
}

#[inline(always)]
fn to_hex_digit(digit: u8) -> char {
    (match digit {
        0..=9 => b'0' + digit,
        10..=255 => b'A' - 10 + digit,
    } as char)
}