# pylint: disable=line-too-long,superfluous-parens,protected-access,too-many-lines
# pylint: disable=too-many-return-statements,too-many-branches,too-many-statements
# PyDERASN -- Python ASN.1 DER/CER/BER codec with abstract structures
-# Copyright (C) 2017-2021 Sergey Matveev <stargrave@stargrave.org>
+# Copyright (C) 2017-2024 Sergey Matveev <stargrave@stargrave.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
* :ref:`bered <bered_ctx>`
* :ref:`defines_by_path <defines_by_path_ctx>`
* :ref:`evgen_mode_upto <evgen_mode_upto_ctx>`
+* :ref:`keep_memoryview <keep_memoryview_ctx>`
.. _pprinting:
page cache used for mmaps. It can take twice the necessary size in
the memory: both in page cache and ZFS ARC.
+.. _keep_memoryview_ctx:
+
+That read-only memoryview could be safe to be used as a value inside
+decoded :py:class:`pyderasn.OctetString` and :py:class:`pyderasn.Any`
+objects. You can enable that by setting `"keep_memoryview": True` in
+:ref:`decode context <ctx>`. No OCTET STRING and ANY values will be
+copied to memory. Of course that works only in DER encoding, where the
+value is continuously encoded.
+
CER encoding
____________
UTCTime
_______
.. autoclass:: pyderasn.UTCTime
- :members: __init__, todatetime
+ :members: __init__, todatetime, totzdatetime
GeneralizedTime
_______________
.. autoclass:: pyderasn.GeneralizedTime
- :members: __init__, todatetime
+ :members: __init__, todatetime, totzdatetime
Special types
-------------
tzUTC = "missing"
-__version__ = "9.1"
+__version__ = "9.3"
__all__ = (
"agg_octet_string",
tag_default = tag_encode(4)
asn1_type_name = "OCTET STRING"
evgen_mode_skip_value = True
+ memoryview_safe = True
def __init__(
self,
self._assert_ready()
return bytes(self._value)
+ def memoryview(self):
+ self._assert_ready()
+ return memoryview(self._value)
+
def __eq__(self, their):
if their.__class__ == bytes:
return self._value == their
decode_path=decode_path,
offset=offset,
)
+ if evgen_mode and self.evgen_mode_skip_value:
+ value = None
+ elif self.memoryview_safe and ctx.get("keep_memoryview", False):
+ value = v
+ else:
+ value = v.tobytes()
try:
obj = self.__class__(
- value=(
- None if (evgen_mode and self.evgen_mode_skip_value)
- else v.tobytes()
- ),
+ value=value,
bounds=(self._bound_min, self._bound_max),
impl=self.tag,
expl=self._expl,
- utf-16-be
"""
__slots__ = ()
+ memoryview_safe = False
def _value_sanitize(self, value):
value_raw = None
return self._value.decode(self.encoding)
return str(self._value)
+ def memoryview(self):
+ raise ValueError("CommonString does not support .memoryview()")
+
def __repr__(self):
return pp_console_row(next(self.pps()))
datetime.datetime(2017, 9, 30, 22, 7, 50)
>>> UTCTime(datetime(2057, 9, 30, 22, 7, 50)).todatetime()
datetime.datetime(1957, 9, 30, 22, 7, 50)
+ >>> UTCTime(datetime(2057, 9, 30, 22, 7, 50)).totzdatetime()
+ datetime.datetime(1957, 9, 30, 22, 7, 50, tzinfo=tzutc())
If BER encoded value was met, then ``ber_raw`` attribute will hold
its raw representation.
try:
return self._value.replace(tzinfo=tzUTC)
except TypeError as err:
- raise NotImplementedError(
- "Package python-dateutil is required to use this feature",
- ) from err
+ raise NotImplementedError("Missing dateutil.tz") from err
def __repr__(self):
return pp_console_row(next(self.pps()))
value = self._value_sanitize(value)
self._value = value
if self._expl is None:
- if value.__class__ == bytes:
+ if value.__class__ == bytes or value.__class__ == memoryview:
tag_class, _, tag_num = tag_decode(tag_strip(value)[0])
else:
tag_class, tag_num = value.tag_order
self.defined = None
def _value_sanitize(self, value):
- if value.__class__ == bytes:
+ if value.__class__ == bytes or value.__class__ == memoryview:
if len(value) == 0:
raise ValueError("%s value can not be empty" % self.__class__.__name__)
return value
self.defined = state.defined
def __eq__(self, their):
- if their.__class__ == bytes:
- if self._value.__class__ == bytes:
+ if their.__class__ == bytes or their.__class__ == memoryview:
+ if self._value.__class__ == bytes or their.__class__ == memoryview:
return self._value == their
return self._value.encode() == their
if issubclass(their.__class__, Any):
if self.ready and their.ready:
- return bytes(self) == bytes(their)
+ return self.memoryview() == their.memoryview()
return self.ready == their.ready
return False
value = self._value
if value.__class__ == bytes:
return value
+ if value.__class__ == memoryview:
+ return bytes(value)
return self._value.encode()
+ def memoryview(self):
+ self._assert_ready()
+ value = self._value
+ if value.__class__ == memoryview:
+ return memoryview(value)
+ return memoryview(bytes(self))
+
@property
def tlen(self):
return 0
def _encode(self):
self._assert_ready()
value = self._value
- if value.__class__ == bytes:
- return value
+ if value.__class__ == bytes or value.__class__ == memoryview:
+ return bytes(self)
return value.encode()
def _encode1st(self, state):
self._assert_ready()
value = self._value
- if value.__class__ == bytes:
+ if value.__class__ == bytes or value.__class__ == memoryview:
return len(value), state
return value.encode1st(state)
def _encode2nd(self, writer, state_iter):
value = self._value
- if value.__class__ == bytes:
+ if value.__class__ == bytes or value.__class__ == memoryview:
write_full(writer, value)
else:
value.encode2nd(writer, state_iter)
def _encode_cer(self, writer):
self._assert_ready()
value = self._value
- if value.__class__ == bytes:
+ if value.__class__ == bytes or value.__class__ == memoryview:
write_full(writer, value)
else:
value.encode_cer(writer)
)
tlvlen = tlen + llen + l
v, tail = tlv[:tlvlen], v[l:]
+ if evgen_mode:
+ value = None
+ elif ctx.get("keep_memoryview", False):
+ value = v
+ else:
+ value = v.tobytes()
obj = self.__class__(
- value=None if evgen_mode else v.tobytes(),
+ value=value,
expl=self._expl,
optional=self.optional,
_decoded=(offset, 0, tlvlen),
value = self._value
if value is None:
pass
- elif value.__class__ == bytes:
+ elif value.__class__ == bytes or value.__class__ == memoryview:
value = None
else:
value = repr(value)
obj_name=self.__class__.__name__,
decode_path=decode_path,
value=value,
- blob=self._value if self._value.__class__ == bytes else None,
+ blob=self._value if (
+ self._value.__class__ == bytes or
+ value.__class__ == memoryview
+ ) else None,
optional=self.optional,
default=self == self.default,
impl=None if self.tag == self.tag_default else tag_decode(self.tag),