Fix: Support complete multihash type mappings in Prefix

cid/prefix.py

@@ -215,40 +215,23 @@ def from_bytes(cls, data: bytes) -> "Prefix":
     @staticmethod
     def _mh_type_to_code(mh_type: str) -> int:
         """Convert multihash type name to code."""
-        # Common multihash type codes
-        # These match the multiformats specification
-        mh_codes = {
-            "sha1": 0x11,
-            "sha2-256": 0x12,
-            "sha2-512": 0x13,
-            "sha3-224": 0x17,
-            "sha3-256": 0x16,
-            "sha3-512": 0x14,
-            "blake2b-256": 0xB220,
-            "blake2b-512": 0xB240,
-        }
-        if mh_type not in mh_codes:
-            msg = f"Unknown multihash type: {mh_type}"
-            raise ValueError(msg)
-        return mh_codes[mh_type]
+        try:
+            return multihash.Func[mh_type.replace("-", "_")].value
+        except KeyError:
+            try:
+                return multihash.coerce_code(mh_type)
+            except (ValueError, TypeError):
+                msg = f"Unknown multihash type: {mh_type}"
+                raise ValueError(msg)
 
     @staticmethod
     def _mh_code_to_type(mh_code: int) -> str:
         """Convert multihash code to type name."""
-        mh_types = {
-            0x11: "sha1",
-            0x12: "sha2-256",
-            0x13: "sha2-512",
-            0x17: "sha3-224",
-            0x16: "sha3-256",
-            0x14: "sha3-512",
-            0xB220: "blake2b-256",
-            0xB240: "blake2b-512",
-        }
-        if mh_code not in mh_types:
+        try:
+            return multihash.Func(mh_code).name.replace("_", "-")
+        except ValueError:
             msg = f"Unknown multihash code: {mh_code}"
             raise ValueError(msg)
-        return mh_types[mh_code]
 
     def __eq__(self, other: object) -> bool:
         """Check equality with another Prefix."""

newsfragments/65.bugfix.rst

@@ -0,0 +1 @@
+Delegate multihash type mappings in Prefix to the multihash library.