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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
use fmt;
use memio;
// Data types specified in the standard
export type class = enum u8 {
UNIVERSAL = 0x0,
APPLICATION = 0x1,
CONTEXT = 0x2,
PRIVATE = 0x3,
};
// String representation of 'c'.
export fn strclass(c: class) str = {
switch (c) {
case class::UNIVERSAL =>
return "UNIVERSAL";
case class::APPLICATION =>
return "APPLICATION";
case class::CONTEXT =>
return "CONTEXT_SPECIFIC";
case class::PRIVATE =>
return "PRIVATE";
};
};
// Universal tags as defined in x.690. Not all are supported by this
// implemenation.
export type utag = enum u8 {
RESERVED = 0x00,
BOOLEAN = 0x01,
INTEGER = 0x02,
BITSTRING = 0x03,
OCTET_STRING = 0x04,
NULL = 0x05,
OID = 0x06,
OBJECT_DESCRIPTOR = 0x07,
EXTERNAL = 0x08,
REAL = 0x09,
ENUMERATED = 0x0a,
EMBEDDED_PDV = 0x0b,
UTF8_STRING = 0x0c,
RELATIVE_OID = 0x0d,
TIME = 0x0e,
RESERVED2 = 0x0f,
SEQUENCE = 0x10,
SET = 0x11,
NUMERIC_STRING = 0x12,
PRINTABLE_STRING = 0x13,
TELETEX_STRING = 0x14, // T61String
VIDEOTEX_STRING = 0x15,
IA5_STRING = 0x16,
UTC_TIME = 0x17,
GENERALIZED_TIME = 0x18,
GRAPHIC_STRING = 0x19,
VISIBLE_STRING = 0x1a, // iso646String
GENERAL_STRING = 0x1b,
UNIVERSAL_STRING = 0x1c,
UNKNOWN = 0x1d,
BMP_STRING = 0x1e,
DATE = 0x1f,
TIME_OF_DAY = 0x20,
DATE_TIME = 0x21,
DURATION = 0x22,
OID_IRI = 0x23,
OID_RELATIVE_IRI = 0x24,
};
// String representation of universal tag ids. May return a statically allocated
// string and will be overwritten on the next call.
export fn strtag(dh: head) str = {
static let tagstrbuf: [128]u8 = [0...];
if (dh.class != class::UNIVERSAL) {
let tagstr = memio::fixed(tagstrbuf);
fmt::fprint(&tagstr, "[")!;
if (dh.class != class::CONTEXT) {
fmt::fprintf(&tagstr, "{} ", strclass(dh.class))!;
};
fmt::fprintf(&tagstr, "{:x}]", dh.tagid)!;
return memio::string(&tagstr)!;
};
if (dh.tagid >> 8 != 0) {
return "UNKNOWN";
};
switch (dh.tagid: u8) {
case utag::BOOLEAN =>
return "BOOLEAN";
case utag::INTEGER =>
return "INTEGER";
case utag::BITSTRING =>
return "BITSTRING";
case utag::OCTET_STRING =>
return "OCTET_STRING";
case utag::NULL =>
return "NULL";
case utag::OID =>
return "OBJECT_IDENTIFIER";
case utag::OBJECT_DESCRIPTOR =>
return "OBJECT_DESCRIPTOR";
case utag::EXTERNAL =>
return "EXTERNAL";
case utag::REAL =>
return "REAL";
case utag::ENUMERATED =>
return "ENUMERATED";
case utag::EMBEDDED_PDV =>
return "EMBEDDED_PDV";
case utag::UTF8_STRING =>
return "UTF8_STRING";
case utag::RELATIVE_OID =>
return "RELATIVE_OID";
case utag::TIME =>
return "TIME";
case utag::SEQUENCE =>
return "SEQUENCE";
case utag::SET =>
return "SET";
case utag::PRINTABLE_STRING =>
return "PRINTABLE_STRING";
case utag::TELETEX_STRING =>
return "TELETEX_STRING";
case utag::UTC_TIME =>
return "UTC_TIME";
case =>
return "UNKNOWN";
};
};
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