feat: add OBJECT IDENTIFIER decoding functions

src/lib.rs

@@ -1,8 +1,44 @@
 #![deny(clippy::all)]
 
 use napi_derive::napi;
+use napi::bindgen_prelude::*;
 
 #[napi]
-pub fn plus_100(input: u32) -> u32 {
-  input + 100
+fn oid_from_str(s: String) -> Option<Vec<u32>> {
+    let mut ret: Vec<u32> = Vec::with_capacity(s.len());
+    for sub in s.split('.') {
+        let i: u32 = sub.parse().ok()?;
+        ret.push(i);
+    }
+    return Some(ret);
+}
+
+#[napi]
+fn oid_from_bytes(b: Uint8Array) -> Option<Vec<u32>> {
+    let len = b.len();
+    if len < 1 {
+        return None;
+    }
+    let arc1 = (b[0] / 40) as u32;
+    let arc2 = (b[0] % 40) as u32;
+    // In pre-allocating, we assume the average OID arc consumes two bytes.
+    let mut nodes: Vec<u32> = Vec::with_capacity(len << 1);
+    nodes.push(arc1);
+    nodes.push(arc2);
+    let mut current_node: u32 = 0;
+    for byte in b[1..].iter() {
+        if (current_node == 0) && (*byte == 0b1000_0000) {
+            return None;
+        }
+        current_node <<= 7;
+        current_node += (byte & 0b0111_1111) as u32;
+        if (byte & 0b1000_0000) == 0 {
+            nodes.push(current_node);
+            current_node = 0;
+        }
+    }
+    if current_node > 0 {
+        return None;
+    }
+    Some(nodes)
 }