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* dgud/asn1/fix-seqtag/OTP-12326:
asn1: Fix EXTERNAL (1994 variant) type conversion
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Missed to add seqtag handling for EXTERNAL type conversion,
bug introduced in c266196c016fc1156c7a18cfeec4920ee4075519
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This patch fixes a bug with compliance to X.680 (200811) s31.2.7
Basically, when TagDefault is AUTOMATIC then
tags are IMPLICIT unless EXPLICIT is given.
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According to the BER encoding rules, only constructed values may
have indefinite lengths. A primitive value must be encoded with
a definite length.
Reported-by: Simon Cornish
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* bjorn/asn1/misc-bug-fixes/OTP-12125:
Workaround for combining two object sets separated by extension
Clean up and correct handling of parameters for parameterized types
Check the formal parameter for parameterized type definitions
Report errors also for unused parameterized types
Remove unused code for ABSTRACT-SYNTAX and TYPE-IDENTIFIER
Correct expansion of parameterized types
Add the module name to the #classdef{} record
Eliminate the use of #identifier{} outside the tokeniser and parser
Fix problem with object identifiers in external modules
Rewrite get_referenced_type/2
Teach the ASN.1 compiler to handle objects in field names
Teach the ASN.1 compiler to understand "EXPORTS ALL"
Teach the ASN.1 compiler the parse option
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* bjorn/asn1/decoding-robustness/OTP-12145:
BER decoding: Improve error checking for indefinite length
BER: Test decoding of indefinite lengths
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The following type of code would crash the compiler:
OSET SOME-CLASS ::= {OSET1, ..., OSET2}
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The previous code looked at the actual parameters supplied when
instantiating the type to determine the type of the argument; the
correct way is to determine the type by looking at the governor and
case of the formal parameter.
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Check the formal parameters for a parameterized type definition.
If the governor for a formal parameter is absent, the formal parameter
must be in upper case.
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Definitions for parameterized types are verified once very early,
and one more time when they are instantiated.
Errors found during the first check were ignored, so errors for
unused parameterized types were not reported.
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Before classes were fully implemented, there was support for
ABSTRACT-SYNTAX and TYPE-IDENTIFIER. Some of that code is still
there and is no longer used. Get rid of it and correct comments.
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Attempting to compile:
SomeType{SOME-CLASS-NAME, SOME-CLASS-NAME:SomeSet} ::= ...
SEQUENCE {
something SOME-CLASS-NAME.&id({SomeSet})
}
would crash the compiler, because the actual parameter for
SOME-CLASS-NAME was not substituted into the governor for
the SomeSet parameter.
While we are at it, combine the functionality of is_class/2
and get_class_def/2 (eliminating is_class/2). Most callers
call both function.
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If we want construct an #'Externaltypereference'{} from
a #classdef{} record, we will need the module name.
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The only remaining use of #identifier{} in asn1ct_check was in a
temporary packaging of a value that would be ultimately be put
into #valuedef{}.
Therefore we can eliminate that last usage but putting the value
directly into a #valuedef{} and we can move the record definition
into asn1ct_parser2.
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When parsing ASN.1, certain constructs can only be understood in
the full context of the entire ASN.1 module.
For instance, the value following ID in this simplified excerpt
from MTSAbstractService88:
administration-88 PORT ::= {
ID {id-pt-administration 88}
}
the value following "ID" can be interpreted either as value
for:
SEQUENCE {
id-pt-administration INTEGER
}
or as an OBJECT IDENTIFIER.
Our ASN.1 parser assumes that a SEQUENCE is meant, and if that
later turns out to be wrong, the SEQUENCE value is rewritten to
an OBJECT IDENTIFIER. The problem is that at the time of the
rewrite, we no longer know in which ASN.1 module id-pt-administration
was defined in, and we have to use the module name in the state{}
record. Unfortunately, the module name in the state{} record may
not always be correct.
While there are attempts in the code to keep the module name
up-to-date when checking imported types, it is not done consistently,
and it seems to be a difficult and error-prone task to attempt
to make it consistent.
A safer and less error-prone approach is to make sure that we
don't lose the module name while parsing. To make it clear what
we are doing, we will introduce a new #seqtag{} record that
are used for tags in SEQUENCE values. The name is based on its
primary use. The record also contains the module in case it happens
to be an OBJECT IDENTIFIER.
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Make sure that we continue to follow external references until
we find a real type.
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EXPORTS ALL is the same as leaving out the EXPORTS statement.
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When an indefinite length was given, the decoder could look beyond
the end of the buffer for the 0,0 that signals the end of the value.
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The BER encoder always encodes length as definite lengths. Therefore
indefinite lengths are not well-tested. Add code to the roundtrip
functions in asn1_test_list to automatically rewrite definite
lengths to indefinite length and call the decoder again.
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This will also eliminate a dialyzer warning.
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The clause is just an optimization for a (extremly rare) special case.
Removing it will eliminate a dialyzer warning.
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The code generator would crash.
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If a named BIT STRING has a lower size bound of 0, treat it the same
way as if there was no constraint for the purposes of trailing zero
bits.
That change will eliminate a dialyzer warning.
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The encoder for the following type would generate a dialyzer warning:
Ns ::= NumericString (FROM ("0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"))
Optimize this case to make it slightly faster as well as eliminate
the dialyzer warning.
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Running dialyzer on test suites is good for finding both bugs and
useless dialyzer warnings. Add a mechanism in asn1_test_lib for
turning on running of dialyzer on all generated code.
Turned off by default, because it is slow and because there are
still a few dialyzer warnings left.
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The default value for an OCTET STRING when legacy_erlang_types was
active would be a binary instead of a list.
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The old code for testing DEFAULT values is messy, inefficient, and
causes dialyzer warnings.
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We need to test DEFAULT values both with and without
legacy_erlang_types.
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If SetIn is defined like this:
SetIn ::= SET {
boolIn BOOLEAN,
intIn INTEGER
}
then it may not be used with an empty DEFAULT value like this:
SetDef1 ::= SET {
set1 SetIn DEFAULT {}
}
The ASN.1 compiler prints an warning message, but still generates
code. (That should be fixed.)
Fix the incorrect ASN.1 specification by making the
components in SetIn optional:
SetIn ::= SET
{
boolIn BOOLEAN OPTIONAL,
intIn INTEGER OPTIONAL
}
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We don't want to touch the code used for encoding BIT STRINGs when
'legacy_erl_types' is active, since it will be removed within two
or three major releases. But we do want to suppress the dialyzer
warnings in the meantime. The easiest way is to call
encode_bit_string/4 with unknown types from an exported function
that is never actually called like this:
-export(['dialyzer-suppressions'/0]).
'dialyzer-suppressions'(Arg) ->
{A,B,C,D} = Arg,
encode_bit_string(A, B, C, D),
ok.
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Calling library routines for validation of constraints may cause
dialyzer warnings if some type of constraints handled by the library
routine are not used in a specific ASN.1 module. To avoid those
warnings (and slightly speed up the decoding), inline the constraint
checking.
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