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107 lines
3.0 KiB
Rust
107 lines
3.0 KiB
Rust
use std::fmt;
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use crate::Uuid;
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pub fn uuid_generate(out: *mut [u8; 16]) {
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// TODO: implement soemthing better than this
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let time = js_sys::Date::now() as u64;
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let random1 = (js_sys::Math::random() * f64::MAX) as u64;
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let random2 = (js_sys::Math::random() * f64::MAX) as u64;
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let random3 = (js_sys::Math::random() * f64::MAX) as u64;
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let random4 = (js_sys::Math::random() * f64::MAX) as u64;
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let mut bytes1 = [0u8; 16];
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let mut bytes2 = [0u8; 16];
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let mut bytes3 = [0u8; 16];
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bytes1[0..8].copy_from_slice(&random1.to_le_bytes());
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bytes1[8..16].copy_from_slice(&random2.to_le_bytes());
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let random3 = random3.to_le_bytes();
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bytes2[0..4].copy_from_slice(&random3[0..4]);
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bytes2[4..12].copy_from_slice(&random4.to_le_bytes());
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bytes2[12..16].copy_from_slice(&random3[4..8]);
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bytes3[0..8].copy_from_slice(&time.to_le_bytes());
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bytes3[8..16].copy_from_slice(&time.to_le_bytes());
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if out.is_null() { return; }
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let out = unsafe { out.as_mut().unwrap() };
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for i in 0..16 {
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let v = bytes1[i] ^ bytes2[i] ^ bytes3[i];
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out[i] = v;
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}
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}
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// Copied from uuid crate: https://github.com/uuid-rs/uuid.git
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// adopted types to our needs
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const UPPER: [u8; 16] = [
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b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'A', b'B',
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b'C', b'D', b'E', b'F',
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];
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const LOWER: [u8; 16] = [
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b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'a', b'b',
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b'c', b'd', b'e', b'f',
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];
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/// The segments of a UUID's [u8; 16] corresponding to each group.
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const BYTE_POSITIONS: [usize; 6] = [0, 4, 6, 8, 10, 16];
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/// The locations that hyphens are written into the buffer, after each
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/// group.
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const HYPHEN_POSITIONS: [usize; 4] = [8, 13, 18, 23];
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pub fn uuid_encode(
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uuid: &[u8; 16],
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upper: bool,
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) -> String {
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let mut buffer = [0u8; 36];
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let hex = if upper { &UPPER } else { &LOWER };
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for group in 0..5 {
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let hyphens_before = group;
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for idx in BYTE_POSITIONS[group]..BYTE_POSITIONS[group + 1] {
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let b = uuid[idx];
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let out_idx = hyphens_before + 2 * idx;
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buffer[out_idx] = hex[(b >> 4) as usize];
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buffer[out_idx + 1] = hex[(b & 0b1111) as usize];
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}
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if group != 4 {
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buffer[HYPHEN_POSITIONS[group]] = b'-';
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}
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}
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std::str::from_utf8(&mut buffer[..])
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.expect("found non-ASCII output characters while encoding a UUID")
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.to_string()
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}
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impl fmt::LowerHex for Uuid {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", uuid_encode(self.as_bytes(), false))
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}
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}
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impl fmt::UpperHex for Uuid {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", uuid_encode(self.as_bytes(), true))
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}
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}
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#[cfg(feature = "serde")]
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impl serde::Serialize for Uuid {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: serde::Serializer,
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{
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serializer.serialize_str(&uuid_encode(self.as_bytes(), false))
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}
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}
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