1 files changed, 90 insertions, 0 deletions
diff --git a/src/uid.rs b/src/uid.rs
new file mode 100644
index 0000000..b15f65b
--- /dev/null
+++ b/src/uid.rs
@@ -0,0 +1,90 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
+pub struct UID(u8, u8);
+impl UID {
+    fn to_hex(&self) -> String {
+        hex::encode_upper(vec![self.0, self.1])
+    }
+    pub fn from(s: String) -> Result<Self, String> {
+        if s.is_ascii() {
+            if s.len() == 4 {
+                match hex::decode(s) {
+                    Ok(n) => Ok(UID(n[0], n[1])),
+                    Err(_) => Err("Could not decode hex".into())
+                }
+
+            } else {
+                Err("UID length is incorrect".into())
+            }
+        } else {
+            Err("UID String is not valid".into())
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct Generator {
+    used_uids: Vec<UID>
+}
+impl Generator {
+    pub fn new() -> Generator {
+        Generator { used_uids: vec![] }
+    }
+
+    pub fn is_taken(&self, uid: UID) -> bool {
+        for u in self.used_uids.clone() {
+            if u == uid {
+                return true;
+            }
+        }
+
+        false
+    }
+
+    pub fn add_uid(&mut self, u: UID) -> Result<UID, String> {
+        if self.used_uids.contains(&u) {
+            Err("UID Taken".into())
+        } else {
+            self.used_uids.push(u);
+            Ok(u)
+        }
+    }
+
+    pub fn new_uid(&mut self) -> Result<UID, String> {
+        let mut count = 0;
+        loop {
+            let first = rand::random::<u8>();
+            let second = rand::random::<u8>();
+            let new = UID(first, second);
+
+            if self.used_uids.contains(&new) {
+                count += 1
+            } else {
+                self.used_uids.push(new);
+                return Ok(new);
+            }
+
+            if count > 1000 {
+                break
+            }
+        }
+
+        // Random generation didn't work.  Try counting up throught all UID possibilities
+        loop {
+            for x in 0..=u8::MAX {
+                for y in 0..=u8::MAX {
+                    let new = UID(x, y);
+                    if !(self.used_uids.contains(&new)) {
+                        self.used_uids.push(new);
+                        return Ok(new);
+                    }
+                }
+            }
+
+            break
+        }
+
+        Err("No available UID left".into())
+    }
+}
+\ No newline at end of file