[jira] [Created] (NIFI-10955) In JASN1Reader allow preprocess of ASN files to reconcile unsupported features

["Tamas Palfy (Jira)" <ji...@apache.org>]

Tamas Palfy created NIFI-10955:
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             Summary: In JASN1Reader allow preprocess of ASN files to reconcile unsupported features
                 Key: NIFI-10955
                 URL: https://issues.apache.org/jira/browse/NIFI-10955
             Project: Apache NiFi
          Issue Type: Improvement
            Reporter: Tamas Palfy


The ASN specification allows the creation of valid ASN files that has features unrecognized by the asn1bean library we are using in JASN1Reader.

We can add a preprocessing step that creates modified versions of the provided ASN files (leaving the originals intact) that removes unsupported features in a way that makes them less strict but otherwise should still be compatible with incoming data.

Identified unsupported features:
 * Certain constraint types
 ** E.g.
{code:java}
SomeType ::= INTEGER (ALL EXCEPT (0..15))
{code}

 * Extension marker (a.k.a "ellipsis" or
{code:java}
...
{code}
)

 ** Can occur in constraints (e.g.
{code:java}
SomeType ::= INTEGER (0..8,...,100..200)
{code}
although
{code:java}
SomeType ::= INTEGER (0..8,...)
{code}
works)

 ** or in type definitions (e.g.
{code:java}
RootType::= SEQUENCE {
	field1		INTEGER,
	field2		INTEGER,
	...,
	field3      INTEGER
}
{code}
but this seems to work as well).

 * Version brackets e.g.
{code:java}
SomeType ::= SEQUENCE {
	integerField1		INTEGER,
	integerField2		INTEGER,
	...,
[[ -- from version 2
	integerField3		INTEGER,
	integerField4		INTEGER ]]
}
{code}
Seems to require extension marker as well.



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