lib/services/cov-notify.js
'use strict';
const baAsn1 = require('../asn1');
const baEnum = require('../enum');
module.exports.encode = (buffer, subscriberProcessId, initiatingDeviceId, monitoredObjectId, timeRemaining, values) => {
baAsn1.encodeContextUnsigned(buffer, 0, subscriberProcessId);
baAsn1.encodeContextObjectId(buffer, 1, baEnum.ObjectType.DEVICE, initiatingDeviceId);
baAsn1.encodeContextObjectId(buffer, 2, monitoredObjectId.type, monitoredObjectId.instance);
baAsn1.encodeContextUnsigned(buffer, 3, timeRemaining);
baAsn1.encodeOpeningTag(buffer, 4);
values.forEach((value) => {
baAsn1.encodeContextEnumerated(buffer, 0, value.property.id);
if (value.property.index === baEnum.ASN1_ARRAY_ALL) {
baAsn1.encodeContextUnsigned(buffer, 1, value.property.index);
}
baAsn1.encodeOpeningTag(buffer, 2);
value.value.forEach((v) => {
baAsn1.bacappEncodeApplicationData(buffer, v);
});
baAsn1.encodeClosingTag(buffer, 2);
if (value.priority === baEnum.ASN1_NO_PRIORITY) {
baAsn1.encodeContextUnsigned(buffer, 3, value.priority);
}
// TODO: Handle to too large telegrams -> APDU limit
});
baAsn1.encodeClosingTag(buffer, 4);
};
module.exports.decode = (buffer, offset, apduLen) => {
let len = 0;
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;
const 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;
const initiatingDeviceId = {type: decodedValue.objectType, instance: decodedValue.instance};
if (!baAsn1.decodeIsContextTag(buffer, offset + len, 2)) return;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeObjectId(buffer, offset + len);
len += decodedValue.len;
const monitoredObjectId = {type: decodedValue.objectType, instance: decodedValue.instance};
if (!baAsn1.decodeIsContextTag(buffer, offset + len, 3)) return;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
const timeRemaining = decodedValue.value;
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 4)) return;
len++;
const values = [];
while ((apduLen - len) > 1 && !baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 4)) {
const newEntry = {};
newEntry.property = {};
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;
newEntry.property.id = decodedValue.value;
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;
newEntry.property.index = decodedValue.value;
} else {
newEntry.property.index = baEnum.ASN1_ARRAY_ALL;
}
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 2)) return;
len++;
const properties = [];
while ((apduLen - len) > 1 && !baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 2)) {
decodedValue = baAsn1.bacappDecodeApplicationData(buffer, offset + len, apduLen + offset, monitoredObjectId.type, newEntry.property.id);
if (!decodedValue) return;
len += decodedValue.len;
delete decodedValue.len;
properties.push(decodedValue);
}
newEntry.value = properties;
len++;
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;
newEntry.priority = decodedValue.value;
} else {
newEntry.priority = baEnum.ASN1_NO_PRIORITY;
}
values.push(newEntry);
}
return {
len: len,
subscriberProcessId: subscriberProcessId,
initiatingDeviceId: initiatingDeviceId,
monitoredObjectId: monitoredObjectId,
timeRemaining: timeRemaining,
values: values
};
};