kojiromike commented on code in PR #1181:
URL: https://github.com/apache/avro/pull/1181#discussion_r1264789889
##########
lang/py/avro/schema.py:
##########
@@ -104,6 +115,50 @@ def _is_timezone_aware_datetime(dt: datetime.datetime) ->
bool:
return dt.tzinfo is not None and dt.tzinfo.utcoffset(dt) is not None
+# Fingerprint Constants
+_EMPTY64_FINGERPRINT: int = 0xC15D213AA4D7A795
+_FINGERPRINT_TABLE: tuple = tuple(reduce(lambda fp, _: (fp >> 1) ^
(_EMPTY64_FINGERPRINT & -(fp & 1)), range(8), i) for i in range(256))
+
+
+# All algorithms guaranteed by hashlib are supported:
+# - 'blake2b',
+# - 'blake2s',
+# - 'md5',
+# - 'sha1',
+# - 'sha224',
+# - 'sha256',
+# - 'sha384',
+# - 'sha3_224',
+# - 'sha3_256',
+# - 'sha3_384',
+# - 'sha3_512',
+# - 'sha512',
+# - 'shake_128',
+# - 'shake_256'
+SUPPORTED_ALGORITHMS: FrozenSet[str] = frozenset({"CRC-64-AVRO"} |
hashlib.algorithms_guaranteed)
+
+
+def _crc_64_fingerprint(data: bytes) -> bytes:
+ """The 64-bit Rabin Fingerprint.
+
+ As described in the Avro specification.
+
+ Args:
+ data: A bytes object containing the UTF-8 encoded parsing canonical
+ form of an Avro schema.
+ Returns:
+ A bytes object with a length of eight.
Review Comment:
Perhaps the endianness should be in the docstring, so it shows up in
`help()` output.
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