Hello, I'm new to ASN.1 and am looking for some guidance, I think I'm
trying to treat it too much like inheritance in c++ but not sure what is
the best direction..
I would like to define a set of messages that have a common header with
three guid octet strings, the first of these strings will have a
constant, unique pre-defined value. Rough example is below, it
compiles, but I've tried many syntax variations trying to add default
values to msgObj with DEFAULT and 'abc...'H, etc, but none of them
compile. What are some approaches to do something like this?
MsgBase DEFINITIONS ::=
BEGIN
MsgBaseType ::= SEQUENCE {
msgObj UuidType,
srcObj UuidType,
dstObj UuidType
}
UuidType ::= OCTET STRING (SIZE (16))
-- how to make header->msgObj unique for IntegerMessage and BoolMessage?
-- say, d6dc8a30428611dbb0de0800200c9a66 and 217fe690428711dbb0de0800200c9a66
-- repectivly??
IntMessage ::= SEQUENCE {
header MsgBaseType,
intVal INTEGER
}
BoolMessage ::= SEQUENCE {
header MsgBaseType,
boolVal BOOLEAN
}
END
Dear Mr. Kaple:
Please understand that setting a default value for IntMessage.header
means that you'll have to set a value for all three elements thereof. That
is, something like this
IntMessage ::= SEQUENCE {
header MsgBaseType DEFAULT {
msgObj 'D6DC8A30428611DBB0DE0800200C9A66'H,
srcObj 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'H,
dstObj 'BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB'H
},
intVal INTEGER
}
For your convenience, I have attached a file with default values for both
IntMessage.header and BoolMessage.header, each value with a unique msgObj.
Please let me know if you still have questions.
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MsgBase DEFINITIONS ::=
BEGIN
MsgBaseType ::= SEQUENCE {
msgObj UuidType,
srcObj UuidType,
dstObj UuidType
}
UuidType ::= OCTET STRING (SIZE (16))
-- how to make header->msgObj unique for IntegerMessage and BoolMessage?
-- say, d6dc8a30428611dbb0de0800200c9a66 and 217fe690428711dbb0de0800200c9a66
-- repectivly??
IntMessage ::= SEQUENCE {
header MsgBaseType DEFAULT { msgObj 'D6DC8A30428611DBB0DE0800200C9A66'H,
srcObj 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'H,
dstObj 'BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB'H
},
intVal INTEGER
}
BoolMessage ::= SEQUENCE {
header MsgBaseType DEFAULT { msgObj '217FE690428711DBB0DE0800200C9A66'H,
srcObj 'CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC'H,
dstObj 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD'H
},
boolVal BOOLEAN
}
END
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