@halsystems/red-bacnet
Version:
NodeRED BACnet IP client
57 lines (56 loc) • 2.25 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, lowLimit, highLimit, objectId, objectName) => {
if ((lowLimit >= 0) && (lowLimit <= baEnum.ASN1_MAX_INSTANCE) && (highLimit >= 0) && (highLimit <= baEnum.ASN1_MAX_INSTANCE)) {
baAsn1.encodeContextUnsigned(buffer, 0, lowLimit);
baAsn1.encodeContextUnsigned(buffer, 1, highLimit);
}
if (objectName && objectName !== '') {
baAsn1.encodeContextCharacterString(buffer, 3, objectName);
}
else {
baAsn1.encodeContextObjectId(buffer, 2, objectId.type, objectId.instance);
}
};
exports.encode = encode;
const decode = (buffer, offset, apduLen) => {
let len = 0;
const value = {};
let decodedValue;
let result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if (result.tagNumber === 0) {
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
if (decodedValue.value <= baEnum.ASN1_MAX_INSTANCE) {
value.lowLimit = decodedValue.value;
}
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
}
if (result.tagNumber === 1) {
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
if (decodedValue.value <= baEnum.ASN1_MAX_INSTANCE) {
value.highLimit = decodedValue.value;
}
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
}
if (result.tagNumber === 2) {
decodedValue = baAsn1.decodeObjectId(buffer, offset + len);
len += decodedValue.len;
value.objectId = { type: decodedValue.objectType, instance: decodedValue.instance };
}
if (result.tagNumber === 3) {
decodedValue = baAsn1.decodeCharacterString(buffer, offset + len, apduLen - (offset + len), result.value);
len += decodedValue.len;
value.objectName = decodedValue.value;
}
value.len = len;
return value;
};
exports.decode = decode;