lib/services/subscribe-property.js
'use strict';
const baAsn1 = require('../asn1');
const baEnum = require('../enum');
module.exports.encode = (buffer, subscriberProcessId, monitoredObjectId, cancellationRequest, issueConfirmedNotifications, lifetime, monitoredProperty, covIncrementPresent, covIncrement) => {
baAsn1.encodeContextUnsigned(buffer, 0, subscriberProcessId);
baAsn1.encodeContextObjectId(buffer, 1, monitoredObjectId.type, monitoredObjectId.instance);
if (!cancellationRequest) {
baAsn1.encodeContextBoolean(buffer, 2, issueConfirmedNotifications);
baAsn1.encodeContextUnsigned(buffer, 3, lifetime);
}
baAsn1.encodeOpeningTag(buffer, 4);
baAsn1.encodeContextEnumerated(buffer, 0, monitoredProperty.id);
if (monitoredProperty.index !== baEnum.ASN1_ARRAY_ALL) {
baAsn1.encodeContextUnsigned(buffer, 1, monitoredProperty.index);
}
baAsn1.encodeClosingTag(buffer, 4);
if (covIncrementPresent) {
baAsn1.encodeContextReal(buffer, 5, covIncrement);
}
};
module.exports.decode = (buffer, offset) => {
let len = 0;
const value = {};
let result;
let decodedValue;
if (!baAsn1.decodeIsContextTag(buffer, offset + len, 0)) return;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
value.subscriberProcessId = decodedValue.value;
if (!baAsn1.decodeIsContextTag(buffer, offset + len, 1)) return;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeObjectId(buffer, offset + len);
len += decodedValue.len;
value.monitoredObjectId = {type: decodedValue.objectType, instance: decodedValue.instance};
value.cancellationRequest = true;
value.issueConfirmedNotifications = false;
if (baAsn1.decodeIsContextTag(buffer, offset + len, 2)) {
value.cancellationRequest = false;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
value.issueConfirmedNotifications = buffer[offset + len] > 0;
len++;
}
value.lifetime = 0;
if (baAsn1.decodeIsContextTag(buffer, offset + len, 3)) {
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
value.lifetime = decodedValue.value;
}
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 4)) return;
len++;
value.monitoredProperty = {};
if (!baAsn1.decodeIsContextTag(buffer, offset + len, 0)) return;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeEnumerated(buffer, offset + len, result.value);
len += decodedValue.len;
value.monitoredProperty.id = decodedValue.value;
value.monitoredProperty.index = baEnum.ASN1_ARRAY_ALL;
if (baAsn1.decodeIsContextTag(buffer, offset + len, 1)) {
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
value.monitoredProperty.index = decodedValue.value;
}
if (!baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 4)) return;
len++;
value.covIncrement = 0;
if (baAsn1.decodeIsContextTag(buffer, offset + len, 5)) {
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeReal(buffer, offset + len);
len += decodedValue.len;
value.covIncrement = decodedValue.value;
}
value.len = len;
return value;
};