update to python3.7

lib/python3.7/site-packages/asn1crypto/_inet.py

@@ -0,0 +1,170 @@
+# coding: utf-8
+from __future__ import unicode_literals, division, absolute_import, print_function
+
+import socket
+import struct
+
+from ._errors import unwrap
+from ._types import byte_cls, bytes_to_list, str_cls, type_name
+
+
+def inet_ntop(address_family, packed_ip):
+    """
+    Windows compatibility shim for socket.inet_ntop().
+
+    :param address_family:
+        socket.AF_INET for IPv4 or socket.AF_INET6 for IPv6
+
+    :param packed_ip:
+        A byte string of the network form of an IP address
+
+    :return:
+        A unicode string of the IP address
+    """
+
+    if address_family not in set([socket.AF_INET, socket.AF_INET6]):
+        raise ValueError(unwrap(
+            '''
+            address_family must be socket.AF_INET (%s) or socket.AF_INET6 (%s),
+            not %s
+            ''',
+            repr(socket.AF_INET),
+            repr(socket.AF_INET6),
+            repr(address_family)
+        ))
+
+    if not isinstance(packed_ip, byte_cls):
+        raise TypeError(unwrap(
+            '''
+            packed_ip must be a byte string, not %s
+            ''',
+            type_name(packed_ip)
+        ))
+
+    required_len = 4 if address_family == socket.AF_INET else 16
+    if len(packed_ip) != required_len:
+        raise ValueError(unwrap(
+            '''
+            packed_ip must be %d bytes long - is %d
+            ''',
+            required_len,
+            len(packed_ip)
+        ))
+
+    if address_family == socket.AF_INET:
+        return '%d.%d.%d.%d' % tuple(bytes_to_list(packed_ip))
+
+    octets = struct.unpack(b'!HHHHHHHH', packed_ip)
+
+    runs_of_zero = {}
+    longest_run = 0
+    zero_index = None
+    for i, octet in enumerate(octets + (-1,)):
+        if octet != 0:
+            if zero_index is not None:
+                length = i - zero_index
+                if length not in runs_of_zero:
+                    runs_of_zero[length] = zero_index
+                longest_run = max(longest_run, length)
+                zero_index = None
+        elif zero_index is None:
+            zero_index = i
+
+    hexed = [hex(o)[2:] for o in octets]
+
+    if longest_run < 2:
+        return ':'.join(hexed)
+
+    zero_start = runs_of_zero[longest_run]
+    zero_end = zero_start + longest_run
+
+    return ':'.join(hexed[:zero_start]) + '::' + ':'.join(hexed[zero_end:])
+
+
+def inet_pton(address_family, ip_string):
+    """
+    Windows compatibility shim for socket.inet_ntop().
+
+    :param address_family:
+        socket.AF_INET for IPv4 or socket.AF_INET6 for IPv6
+
+    :param ip_string:
+        A unicode string of an IP address
+
+    :return:
+        A byte string of the network form of the IP address
+    """
+
+    if address_family not in set([socket.AF_INET, socket.AF_INET6]):
+        raise ValueError(unwrap(
+            '''
+            address_family must be socket.AF_INET (%s) or socket.AF_INET6 (%s),
+            not %s
+            ''',
+            repr(socket.AF_INET),
+            repr(socket.AF_INET6),
+            repr(address_family)
+        ))
+
+    if not isinstance(ip_string, str_cls):
+        raise TypeError(unwrap(
+            '''
+            ip_string must be a unicode string, not %s
+            ''',
+            type_name(ip_string)
+        ))
+
+    if address_family == socket.AF_INET:
+        octets = ip_string.split('.')
+        error = len(octets) != 4
+        if not error:
+            ints = []
+            for o in octets:
+                o = int(o)
+                if o > 255 or o < 0:
+                    error = True
+                    break
+                ints.append(o)
+
+        if error:
+            raise ValueError(unwrap(
+                '''
+                ip_string must be a dotted string with four integers in the
+                range of 0 to 255, got %s
+                ''',
+                repr(ip_string)
+            ))
+
+        return struct.pack(b'!BBBB', *ints)
+
+    error = False
+    omitted = ip_string.count('::')
+    if omitted > 1:
+        error = True
+    elif omitted == 0:
+        octets = ip_string.split(':')
+        error = len(octets) != 8
+    else:
+        begin, end = ip_string.split('::')
+        begin_octets = begin.split(':')
+        end_octets = end.split(':')
+        missing = 8 - len(begin_octets) - len(end_octets)
+        octets = begin_octets + (['0'] * missing) + end_octets
+
+    if not error:
+        ints = []
+        for o in octets:
+            o = int(o, 16)
+            if o > 65535 or o < 0:
+                error = True
+                break
+            ints.append(o)
+
+        return struct.pack(b'!HHHHHHHH', *ints)
+
+    raise ValueError(unwrap(
+        '''
+        ip_string must be a valid ipv6 string, got %s
+        ''',
+        repr(ip_string)
+    ))