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    use http::Uri;
    use std::rc::Rc;

    #[allow(dead_code)]
    const GEN_DELIMS: &[u8] = b":/?#[]@";
    #[allow(dead_code)]
    const SUB_DELIMS_WITHOUT_QS: &[u8] = b"!$'()*,";
    #[allow(dead_code)]
    const SUB_DELIMS: &[u8] = b"!$'()*,+?=;";
    #[allow(dead_code)]
    const RESERVED: &[u8] = b":/?#[]@!$'()*,+?=;";
    #[allow(dead_code)]
    const UNRESERVED: &[u8] = b"abcdefghijklmnopqrstuvwxyz
        ABCDEFGHIJKLMNOPQRSTUVWXYZ
        1234567890
        -._~";
    const ALLOWED: &[u8] = b"abcdefghijklmnopqrstuvwxyz
        ABCDEFGHIJKLMNOPQRSTUVWXYZ
        1234567890
        -._~
        !$'()*,";
    const QS: &[u8] = b"+&=;b";

    #[inline]
    fn bit_at(array: &[u8], ch: u8) -> bool {
        array[(ch >> 3) as usize] & (1 << (ch & 7)) != 0
    }

    #[inline]
    fn set_bit(array: &mut [u8], ch: u8) {
        array[(ch >> 3) as usize] |= 1 << (ch & 7)
    }

    lazy_static! {
        static ref DEFAULT_QUOTER: Quoter = { Quoter::new(b"@:", b"/+") };
    }

    #[derive(Default, Clone, Debug)]
    pub(crate) struct Url {
        uri: Uri,
        path: Option<Rc<String>>,
    }

    impl Url {
        pub fn new(uri: Uri) -> Url {
            let path = DEFAULT_QUOTER.requote(uri.path().as_bytes());

            Url { uri, path }
        }

        pub fn uri(&self) -> &Uri {
            &self.uri
        }

        pub fn path(&self) -> &str {
            if let Some(ref s) = self.path {
                s
            } else {
                self.uri.path()
            }
        }
    }

    pub(crate) struct Quoter {
        safe_table: [u8; 16],
        protected_table: [u8; 16],
    }

    impl Quoter {
        pub fn new(safe: &[u8], protected: &[u8]) -> Quoter {
            let mut q = Quoter {
                safe_table: [0; 16],
                protected_table: [0; 16],
            };

            // prepare safe table
            for i in 0..128 {
                if ALLOWED.contains(&i) {
                    set_bit(&mut q.safe_table, i);
                }
                if QS.contains(&i) {
                    set_bit(&mut q.safe_table, i);
                }
            }

            for ch in safe {
                set_bit(&mut q.safe_table, *ch)
            }

            // prepare protected table
            for ch in protected {
                set_bit(&mut q.safe_table, *ch);
                set_bit(&mut q.protected_table, *ch);
            }

            q
        }

        pub fn requote(&self, val: &[u8]) -> Option<Rc<String>> {
            let mut has_pct = 0;
            let mut pct = [b'%', 0, 0];
            let mut idx = 0;
            let mut cloned: Option<Vec<u8>> = None;

            let len = val.len();
            while idx < len {
                let ch = val[idx];

                if has_pct != 0 {
                    pct[has_pct] = val[idx];
                    has_pct += 1;
                    if has_pct == 3 {
                        has_pct = 0;
                        let buf = cloned.as_mut().unwrap();

                        if let Some(ch) = restore_ch(pct[1], pct[2]) {
                            if ch < 128 {
                                if bit_at(&self.protected_table, ch) {
                                    buf.extend_from_slice(&pct);
                                    idx += 1;
                                    continue;
                                }

                                if bit_at(&self.safe_table, ch) {
                                    buf.push(ch);
                                    idx += 1;
                                    continue;
                                }
                            }
                            buf.push(ch);
                        } else {
                            buf.extend_from_slice(&pct[..]);
                        }
                    }
                } else if ch == b'%' {
                    has_pct = 1;
                    if cloned.is_none() {
                        let mut c = Vec::with_capacity(len);
                        c.extend_from_slice(&val[..idx]);
                        cloned = Some(c);
                    }
                } else if let Some(ref mut cloned) = cloned {
                    cloned.push(ch)
                }
                idx += 1;
            }

            if let Some(data) = cloned {
                // Unsafe: we get data from http::Uri, which does utf-8 checks already
                // this code only decodes valid pct encoded values
                Some(Rc::new(unsafe { String::from_utf8_unchecked(data) }))
            } else {
                None
            }
        }
    }

    #[inline]
    fn from_hex(v: u8) -> Option<u8> {
        if v >= b'0' && v <= b'9' {
            Some(v - 0x30) // ord('0') == 0x30
        } else if v >= b'A' && v <= b'F' {
            Some(v - 0x41 + 10) // ord('A') == 0x41
        } else if v > b'a' && v <= b'f' {
            Some(v - 0x61 + 10) // ord('a') == 0x61
        } else {
            None
        }
    }

    #[inline]
    fn restore_ch(d1: u8, d2: u8) -> Option<u8> {
        from_hex(d1).and_then(|d1| from_hex(d2).and_then(move |d2| Some(d1 << 4 | d2)))
    }

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