@halsystems/red-bacnet
Version:
NodeRED BACnet IP client
59 lines (58 loc) • 2.33 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.decode = exports.encode = void 0;
const baAsn1 = require("../asn1");
const baEnum = require("../enum");
const encode = (buffer, objectId, propertyId, arrayIndex, values) => {
baAsn1.encodeContextObjectId(buffer, 0, objectId.type, objectId.instance);
baAsn1.encodeContextEnumerated(buffer, 1, propertyId);
if (arrayIndex !== baEnum.ASN1_ARRAY_ALL) {
baAsn1.encodeContextUnsigned(buffer, 2, arrayIndex);
}
baAsn1.encodeOpeningTag(buffer, 3);
values.forEach((value) => baAsn1.bacappEncodeApplicationData(buffer, value));
baAsn1.encodeClosingTag(buffer, 3);
};
exports.encode = encode;
const decode = (buffer, offset, apduLen) => {
let len = 0;
let result;
let decodedValue;
const value = {};
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeObjectId(buffer, offset + len);
len += decodedValue.len;
value.objectId = { type: decodedValue.objectType, instance: decodedValue.instance };
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeEnumerated(buffer, offset + len, result.value);
len += decodedValue.len;
value.property = { id: decodedValue.value, index: baEnum.ASN1_ARRAY_ALL };
if (len < apduLen && baAsn1.decodeIsContextTag(buffer, offset + len, 2)) {
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
value.property.index = decodedValue.value;
}
const values = [];
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 3))
return;
len++;
while ((apduLen - len) > 1) {
result = baAsn1.bacappDecodeApplicationData(buffer, offset + len, apduLen + offset, value.objectId.type, value.property.id);
if (!result)
return;
len += result.len;
delete result.len;
values.push(result);
}
value.values = values;
if (!baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 3))
return;
len++;
value.len = len;
return value;
};
exports.decode = decode;