ref: 7ae7351ace73a70cbbaf5a2da016005485d0d43b
dir: /module/asn1.m/
ASN1: module {
PATH: con "/dis/lib/asn1.dis";
# Tag classes
Universal : con 0;
Application : con 16r40;
Context : con 16r80;
Private : con 16rC0;
# Universal tags
BOOLEAN : con 1;
INTEGER : con 2;
BIT_STRING : con 3;
OCTET_STRING : con 4;
NULL : con 5;
OBJECT_ID: con 6;
ObjectDescriptor : con 7;
EXTERNAL : con 8;
REAL : con 9;
ENUMERATED : con 10;
EMBEDDED_PDV : con 11;
SEQUENCE : con 16; # also SEQUENCE OF
SET : con 17; # also SET OF
NumericString : con 18;
PrintableString : con 19;
TeletexString : con 20;
VideotexString : con 21;
IA5String : con 22;
UTCTime : con 23;
GeneralizedTime : con 24;
GraphicString : con 25;
VisibleString : con 26;
GeneralString : con 27;
UniversalString : con 28;
BMPString : con 30;
Elem: adt {
tag: Tag;
val: ref Value;
is_seq: fn(e: self ref Elem) : (int, list of ref Elem);
is_set: fn(e: self ref Elem) : (int, list of ref Elem);
is_int: fn(e: self ref Elem) : (int, int);
is_bigint: fn(e: self ref Elem) : (int, array of byte);
is_bitstring: fn(e: self ref Elem) : (int, int, array of byte);
is_octetstring: fn(e: self ref Elem) : (int, array of byte);
is_oid: fn(e: self ref Elem) : (int, ref Oid);
is_string: fn(e: self ref Elem) : (int, string);
is_time: fn(e: self ref Elem) : (int, string);
tostring: fn(e: self ref Elem) : string;
};
Tag: adt {
class: int;
num: int;
constr: int; # ignored by encode()
tostring: fn(t: self Tag) : string;
};
Value: adt {
pick {
Bool or Int =>
v: int;
Octets or BigInt or Real or Other =>
# BigInt: integer too big for limbo int
# Real: we don't care to decode these
# since they are hardly ever used
bytes: array of byte;
BitString =>
# pack into bytes, with perhaps some
# unused bits in last byte
unusedbits: int;
bits: array of byte;
Null or EOC =>
dummy: int;
ObjId =>
id: ref Oid;
String =>
s: string;
Seq or Set =>
l: list of ref Elem;
}
tostring : fn(v: self ref Value) : string;
};
Oid: adt {
nums: array of int;
tostring: fn(o: self ref Oid) : string;
};
init: fn();
decode: fn(a: array of byte) : (string, ref Elem);
decode_seq: fn(a: array of byte) : (string, list of ref Elem);
decode_value: fn(a: array of byte, kind, constr: int) : (string, ref Value);
encode: fn(e: ref Elem) : (string, array of byte);
oid_lookup: fn(o: ref Oid, tab: array of Oid) : int;
print_elem: fn(e: ref Elem);
};