1 files changed, 177 insertions, 0 deletions
diff --git a/vendor/uuid/src/v6.rs b/vendor/uuid/src/v6.rs
new file mode 100644
index 000000000..07644fd4f
--- /dev/null
+++ b/vendor/uuid/src/v6.rs
@@ -0,0 +1,177 @@
+//! The implementation for Version 6 UUIDs.
+//!
+//! Note that you need to enable the `v6` Cargo feature
+//! in order to use this module.
+
+use crate::{Builder, Timestamp, Uuid};
+
+impl Uuid {
+    /// Create a new version 6 UUID using the current system time and node ID.
+    ///
+    /// This method is only available if the `std` feature is enabled.
+    ///
+    /// This method is a convenient alternative to [`Uuid::new_v6`] that uses the current system time
+    /// as the source timestamp.
+    ///
+    /// Note that usage of this method requires the `v6`, `std`, and `rng` features of this crate
+    /// to be enabled.
+    #[cfg(all(feature = "std", feature = "rng"))]
+    pub fn now_v6(node_id: &[u8; 6]) -> Self {
+        let ts = Timestamp::now(crate::timestamp::context::shared_context());
+
+        Self::new_v6(ts, node_id)
+    }
+
+    /// Create a new version 6 UUID using the given timestamp and a node ID.
+    ///
+    /// This is similar to version 1 UUIDs, except that it is lexicographically sortable by timestamp.
+    ///
+    /// Also see [`Uuid::now_v6`] for a convenient way to generate version 6
+    /// UUIDs using the current system time.
+    ///
+    /// When generating [`Timestamp`]s using a [`ClockSequence`], this function
+    /// is only guaranteed to produce unique values if the following conditions
+    /// hold:
+    ///
+    /// 1. The *node ID* is unique for this process,
+    /// 2. The *context* is shared across all threads which are generating version 6
+    ///    UUIDs,
+    /// 3. The [`ClockSequence`] implementation reliably returns unique
+    ///    clock sequences (this crate provides [`Context`] for this
+    ///    purpose. However you can create your own [`ClockSequence`]
+    ///    implementation, if [`Context`] does not meet your needs).
+    ///
+    /// The NodeID must be exactly 6 bytes long.
+    ///
+    /// Note that usage of this method requires the `v6` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// A UUID can be created from a unix [`Timestamp`] with a
+    /// [`ClockSequence`]. RFC4122 requires the clock sequence
+    /// is seeded with a random value:
+    ///
+    /// ```rust
+    /// # use uuid::{Uuid, Timestamp, Context};
+    /// # fn random_seed() -> u16 { 42 }
+    /// let context = Context::new(random_seed());
+    /// let ts = Timestamp::from_unix(context, 1497624119, 1234);
+    ///
+    /// let uuid = Uuid::new_v6(ts, &[1, 2, 3, 4, 5, 6]);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "1e752a1f-3b49-658c-802a-010203040506"
+    /// );
+    /// ```
+    ///
+    /// The timestamp can also be created manually as per RFC4122:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Timestamp, Context, ClockSequence};
+    /// # fn random_seed() -> u16 { 42 }
+    /// let context = Context::new(random_seed());
+    /// let ts = Timestamp::from_rfc4122(14976241191231231313, context.generate_sequence(0, 0) );
+    ///
+    /// let uuid = Uuid::new_v6(ts, &[1, 2, 3, 4, 5, 6]);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "fd64c041-1e91-6551-802a-010203040506"
+    /// );
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 6 UUIDs in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-5.1)
+    ///
+    /// [`Timestamp`]: v1/struct.Timestamp.html
+    /// [`ClockSequence`]: v1/trait.ClockSequence.html
+    /// [`Context`]: v1/struct.Context.html
+    pub fn new_v6(ts: Timestamp, node_id: &[u8; 6]) -> Self {
+        let (ticks, counter) = ts.to_rfc4122();
+
+        Builder::from_sorted_rfc4122_timestamp(ticks, counter, node_id).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Context, Variant, Version};
+    use std::string::ToString;
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_946_000;
+        let node = [1, 2, 3, 4, 5, 6];
+        let context = Context::new(0);
+
+        let uuid = Uuid::new_v6(Timestamp::from_unix(context, time, time_fraction), &node);
+
+        assert_eq!(uuid.get_version(), Some(Version::SortMac));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+        assert_eq!(
+            uuid.hyphenated().to_string(),
+            "1e74ba22-0616-6934-8000-010203040506"
+        );
+
+        let ts = uuid.get_timestamp().unwrap().to_rfc4122();
+
+        assert_eq!(ts.0 - 0x01B2_1DD2_1381_4000, 14_968_545_358_129_460);
+
+        // Ensure parsing the same UUID produces the same timestamp
+        let parsed = Uuid::parse_str("1e74ba22-0616-6934-8000-010203040506").unwrap();
+
+        assert_eq!(
+            uuid.get_timestamp().unwrap(),
+            parsed.get_timestamp().unwrap()
+        );
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    #[cfg(all(feature = "std", feature = "rng"))]
+    fn test_now() {
+        let node = [1, 2, 3, 4, 5, 6];
+
+        let uuid = Uuid::now_v6(&node);
+
+        assert_eq!(uuid.get_version(), Some(Version::SortMac));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new_context() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_946_000;
+        let node = [1, 2, 3, 4, 5, 6];
+
+        // This context will wrap
+        let context = Context::new((u16::MAX >> 2) - 1);
+
+        let uuid1 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        let time: u64 = 1_496_854_536;
+
+        let uuid2 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid1.get_timestamp().unwrap().to_rfc4122().1, 16382);
+        assert_eq!(uuid2.get_timestamp().unwrap().to_rfc4122().1, 0);
+
+        let time = 1_496_854_535;
+
+        let uuid3 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+        let uuid4 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid3.get_timestamp().unwrap().counter, 1);
+        assert_eq!(uuid4.get_timestamp().unwrap().counter, 2);
+    }
+}