@halsystems/red-bacnet
Version:
NodeRED BACnet IP client
105 lines (104 loc) • 3.95 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.encodeAcknowledge = exports.decode = exports.encode = void 0;
const baAsn1 = require("../asn1");
const baEnum = require("../enum");
const encode = (buffer, objectId, values) => {
baAsn1.encodeOpeningTag(buffer, 0);
baAsn1.encodeContextObjectId(buffer, 1, objectId.type, objectId.instance);
baAsn1.encodeClosingTag(buffer, 0);
baAsn1.encodeOpeningTag(buffer, 1);
values.forEach((propertyValue) => {
baAsn1.encodeContextEnumerated(buffer, 0, propertyValue.property.id);
if (propertyValue.property.index !== baEnum.ASN1_ARRAY_ALL) {
baAsn1.encodeContextUnsigned(buffer, 1, propertyValue.property.index);
}
baAsn1.encodeOpeningTag(buffer, 2);
propertyValue.value.forEach((value) => {
baAsn1.bacappEncodeApplicationData(buffer, value);
});
baAsn1.encodeClosingTag(buffer, 2);
if (propertyValue.priority !== baEnum.ASN1_NO_PRIORITY) {
baAsn1.encodeContextUnsigned(buffer, 3, propertyValue.priority);
}
});
baAsn1.encodeClosingTag(buffer, 1);
};
exports.encode = encode;
const decode = (buffer, offset, apduLen) => {
let len = 0;
let result;
let decodedValue;
let objectId;
const valueList = [];
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if ((result.tagNumber === 0) && (apduLen > len)) {
apduLen -= len;
if (apduLen < 4)
return;
decodedValue = baAsn1.decodeContextObjectId(buffer, offset + len, 1);
len += decodedValue.len;
objectId = { type: decodedValue.objectType, instance: decodedValue.instance };
}
else {
return;
}
if (baAsn1.decodeIsClosingTag(buffer, offset + len)) {
len++;
}
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 1))
return;
len++;
while ((apduLen - len) > 1) {
const newEntry = {};
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if (result.tagNumber !== 0)
return;
decodedValue = baAsn1.decodeEnumerated(buffer, offset + len, result.value);
len += decodedValue.len;
const propertyId = decodedValue.value;
let arraIndex = baEnum.ASN1_ARRAY_ALL;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if (result.tagNumber === 1) {
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
arraIndex += decodedValue.value;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
}
newEntry.property = { id: propertyId, index: arraIndex };
if ((result.tagNumber === 2) && (baAsn1.decodeIsOpeningTag(buffer, offset + len - 1))) {
const values = [];
while (!baAsn1.decodeIsClosingTag(buffer, offset + len)) {
decodedValue = baAsn1.bacappDecodeApplicationData(buffer, offset + len, apduLen + offset, objectId.type, propertyId);
if (!decodedValue)
return;
len += decodedValue.len;
delete decodedValue.len;
values.push(decodedValue);
}
len++;
newEntry.value = values;
}
else {
return;
}
valueList.push(newEntry);
}
if (!baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 1))
return;
len++;
return {
len: len,
objectId: objectId,
values: valueList
};
};
exports.decode = decode;
const encodeAcknowledge = (buffer, objectId) => {
baAsn1.encodeApplicationObjectId(buffer, objectId.type, objectId.instance);
};
exports.encodeAcknowledge = encodeAcknowledge;