8000 Error decoding recursive types · Issue #19 · pyasn1/pyasn1 · GitHub
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Error decoding recursive types #19

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FernandoGM5 opened this issue Dec 29, 2022 · 0 comments
Open

Error decoding recursive types #19

FernandoGM5 opened this issue Dec 29, 2022 · 0 comments

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@FernandoGM5
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When a defined class has a component of himself, the decoder do wrong with the tags and looses the track for decoding.
How it can be solved?
Thanks

The example:

from pyasn1.codec.ber.decoder import decode # der o ber
from pyasn1.codec.ber.encoder import encode # der o ber
from hexdump import hexdump

from pyasn1.type import univ, char, namedtype, namedval, tag, constraint, useful

class FloatingPoint(univ.OctetString):
    pass

class Data(univ.Choice):
    pass

Data.componentType = namedtype.NamedTypes(
    namedtype.NamedType('array', univ.SequenceOf(componentType=Data()).subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))),
    namedtype.NamedType('structure', univ.SequenceOf(componentType=Data()).subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2))),
    namedtype.NamedType('floating-point', FloatingPoint().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 7))),
)

dataO=Data()
dataO['floating-point']=b"\x08\x40\xFF\xFF\xF5"
bin=encode(dataO)
hexdump(bin)
    #produces 87 05 08 40 FF FF F5

dataO2=decode(bin,Data())# OK

bin=b"\xa2\x07\x87\x05\x08\x40\xFF\xFF\xF5"
dataO2=decode(bin,Data()) # NOT OK. ERROR:

#pyasn1.error.PyAsn1Error: <TagSet object, tags 128:0:7> not in asn1Spec: <Data schema object, tagSet=<TagSet object, untagged>, subtypeSpec=<ConstraintsIntersection object, consts <ValueSizeConstraint object, consts 1, 1>>, componentType=<NamedTypes object, types >, sizeSpec=<ConstraintsIntersection object>>
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