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... b'0 ')
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... print(asn1Object)
>>>
SequenceOf:
1 2 3
Decode BER serialisation with ASN.1 schema
.. code-block:: pycon
>>> stream = io.BytesIO(
... b'0 ')
>>>
>>> schema = SequenceOf(componentType=Integer())
>>>
>>> decoder = StreamingDecoder(stream, asn1Spec=schema)
>>> for asn1Object in decoder:
... print(asn1Object)
>>>
SequenceOf:
1 2 3
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r' c # K | j | j | j fi | j D ]}|V t | j D ]}t |t rd V |rd S Zr7 )r r r r r rU rV )r r+ r8 s r% __iter__zStreamingDecoder.__iter__ s 5d 5OT^ F F7;} F F
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Parse BER/CER/DER octet-stream into one, possibly nested, ASN.1 object.
Nc B t | }d|v r|d dfd }||d< | j ||fi |}|D ]e}t |t rt j d t t
| }n# t j $ r d}Y nw xY w||fc S dS )a.
Turns BER/CER/DER octet stream into an ASN.1 object.
Takes BER/CER/DER octet-stream in form of :py:class:`bytes`
and decode it into an ASN.1 object
(e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative) which
may be a scalar or an arbitrary nested structure.
Parameters
----------
substrate: :py:class:`bytes`
BER/CER/DER octet-stream to parse
Keyword Args
------------
asn1Spec: :py:class:`~pyasn1.type.base.PyAsn1Item`
A pyasn1 type object (:py:class:`~pyasn1.type.base.PyAsn1Item`
derivative) to act as a template guiding the decoder.
Depending on the ASN.1 structure being decoded, `asn1Spec` may or
may not be required. Most common reason for it to require is that
ASN.1 structure is encoded in *IMPLICIT* tagging mode.
substrateFun: :py:class:`Union[
Callable[[pyasn1.type.base.PyAsn1Item, bytes, int],
Tuple[pyasn1.type.base.PyAsn1Item, bytes]],
Callable[[pyasn1.type.base.PyAsn1Item, io.BytesIO, int, dict],
Generator[Union[pyasn1.type.base.PyAsn1Item,
pyasn1.error.SubstrateUnderrunError],
None, None]]
]`
User callback meant to generalize special use cases like non-recursive or
partial decoding. A 3-arg non-streaming variant is supported for backwards
compatiblilty in addition to the newer 4-arg streaming variant.
The callback will receive the uninitialized object recovered from substrate
as 1st argument, the uninterpreted payload as 2nd argument, and the length
of the uninterpreted payload as 3rd argument. The streaming variant will
additionally receive the decode(..., **options) kwargs as 4th argument.
The non-streaming variant shall return an object that will be propagated
as decode() return value as 1st item, and the remainig payload for further
decode passes as 2nd item.
The streaming variant shall yield an object that will be propagated as
decode() return value, and leave the remaining payload in the stream.
Returns
-------
: :py:class:`tuple`
A tuple of :py:class:`~pyasn1.type.base.PyAsn1Item` object
recovered from BER/CER/DER substrate and the unprocessed trailing
portion of the `substrate` (may be empty)
Raises
------
: :py:class:`~pyasn1.error.PyAsn1Error`
:py:class:`~pyasn1.error.SubstrateUnderrunError` on insufficient
input or :py:class:`~pyasn1.error.PyAsn1Error` on decoding error.
Examples
--------
Decode BER/CER/DER serialisation without ASN.1 schema
.. code-block:: pycon
>>> s, unprocessed = decode(b'0 ')
>>> str(s)
SequenceOf:
1 2 3
Decode BER/CER/DER serialisation with ASN.1 schema
.. code-block:: pycon
>>> seq = SequenceOf(componentType=Integer())
>>> s, unprocessed = decode(
b'0 ', asn1Spec=seq)
>>> str(s)
SequenceOf:
1 2 3
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non-streaming v0.4 user callback and convert it for streaming on the fly
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