--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cutils/crcmod/python2/_crcfunpy.py	Mon Jan 13 04:09:35 2025 +0100
@@ -0,0 +1,87 @@
+#-----------------------------------------------------------------------------
+# Low level CRC functions for use by crcmod.  This version is implemented in
+# Python for a couple of reasons.  1) Provide a reference implememtation.
+# 2) Provide a version that can be used on systems where a C compiler is not
+# available for building extension modules.
+#
+# Copyright (c) 2004  Raymond L. Buvel
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#-----------------------------------------------------------------------------
+
+def _crc8(data, crc, table):
+    crc = crc & 0xFF
+    for x in data:
+        crc = table[ord(x) ^ crc]
+    return crc
+
+def _crc8r(data, crc, table):
+    crc = crc & 0xFF
+    for x in data:
+        crc = table[ord(x) ^ crc]
+    return crc
+
+def _crc16(data, crc, table):
+    crc = crc & 0xFFFF
+    for x in data:
+        crc = table[ord(x) ^ ((crc>>8) & 0xFF)] ^ ((crc << 8) & 0xFF00)
+    return crc
+
+def _crc16r(data, crc, table):
+    crc = crc & 0xFFFF
+    for x in data:
+        crc = table[ord(x) ^ (crc & 0xFF)] ^ (crc >> 8)
+    return crc
+
+def _crc24(data, crc, table):
+    crc = crc & 0xFFFFFF
+    for x in data:
+        crc = table[ord(x) ^ (int(crc>>16) & 0xFF)] ^ ((crc << 8) & 0xFFFF00)
+    return crc
+
+def _crc24r(data, crc, table):
+    crc = crc & 0xFFFFFF
+    for x in data:
+        crc = table[ord(x) ^ int(crc & 0xFF)] ^ (crc >> 8)
+    return crc
+
+def _crc32(data, crc, table):
+    crc = crc & 0xFFFFFFFFL
+    for x in data:
+        crc = table[ord(x) ^ (int(crc>>24) & 0xFF)] ^ ((crc << 8) & 0xFFFFFF00L)
+    return crc
+
+def _crc32r(data, crc, table):
+    crc = crc & 0xFFFFFFFFL
+    for x in data:
+        crc = table[ord(x) ^ int(crc & 0xFFL)] ^ (crc >> 8)
+    return crc
+
+def _crc64(data, crc, table):
+    crc = crc & 0xFFFFFFFFFFFFFFFFL
+    for x in data:
+        crc = table[ord(x) ^ (int(crc>>56) & 0xFF)] ^ ((crc << 8) & 0xFFFFFFFFFFFFFF00L)
+    return crc
+
+def _crc64r(data, crc, table):
+    crc = crc & 0xFFFFFFFFFFFFFFFFL
+    for x in data:
+        crc = table[ord(x) ^ int(crc & 0xFFL)] ^ (crc >> 8)
+    return crc
+