feat: into_v1

src/cid.rs

@@ -108,6 +108,19 @@ impl<const S: usize> Cid<S> {
         }
     }
 
+    /// Convert a CIDv0 to a CIDv1. Returns unchanged if already a CIDv1.
+    pub fn into_v1(self) -> Result<Self> {
+        match self.version {
+            Version::V0 => {
+                if self.codec != DAG_PB {
+                    return Err(Error::InvalidCidV0Codec);
+                }
+                Ok(Self::new_v1(self.codec, self.hash))
+            }
+            Version::V1 => Ok(self),
+        }
+    }
+
     /// Returns the cid version.
     pub const fn version(&self) -> Version {
         self.version

tests/lib.rs

@@ -162,3 +162,19 @@ fn method_can_take_differently_sized_cids() {
         a_function_that_takes_a_generic_cid(&cid_128)
     );
 }
+
+#[test]
+fn test_into_v1() {
+    let cid = Cid::from_str("QmTPcW343HGMdoxarwvHHoPhkbo5GfNYjnZkyW5DBtpvLe").unwrap();
+    let cid_v1 = cid.into_v1().unwrap();
+    assert_eq!(cid_v1.version(), Version::V1);
+    assert_eq!(
+        cid_v1.to_string(),
+        "bafybeiclbsxcvqpfliqcejqz5ghpvw4r7vktjkyk3ruvjvdmam5azct2v4"
+    );
+
+    let cid = Cid::from_str("bafyreibjo4xmgaevkgud7mbifn3dzp4v4lyaui4yvqp3f2bqwtxcjrdqg4").unwrap();
+    let cid_v1 = cid.into_v1().unwrap();
+    assert_eq!(cid_v1.version(), Version::V1);
+    assert_eq!(cid_v1, cid);
+}