@halsystems/red-bacnet
Version:
NodeRED BACnet IP client
60 lines (59 loc) • 2.32 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, deviceId, maxApdu, segmentation, vendorId) => {
baAsn1.encodeApplicationObjectId(buffer, baEnum.ObjectType.DEVICE, deviceId);
baAsn1.encodeApplicationUnsigned(buffer, maxApdu);
baAsn1.encodeApplicationEnumerated(buffer, segmentation);
baAsn1.encodeApplicationUnsigned(buffer, vendorId);
};
exports.encode = encode;
const decode = (buffer, offset) => {
let result;
let apduLen = 0;
const orgOffset = offset;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + apduLen);
apduLen += result.len;
if (result.tagNumber !== baEnum.ApplicationTags.OBJECTIDENTIFIER)
return;
result = baAsn1.decodeObjectId(buffer, offset + apduLen);
apduLen += result.len;
if (result.objectType !== baEnum.ObjectType.DEVICE)
return;
const deviceId = result.instance;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + apduLen);
apduLen += result.len;
if (result.tagNumber !== baEnum.ApplicationTags.UNSIGNED_INTEGER)
return;
result = baAsn1.decodeUnsigned(buffer, offset + apduLen, result.value);
apduLen += result.len;
const maxApdu = result.value;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + apduLen);
apduLen += result.len;
if (result.tagNumber !== baEnum.ApplicationTags.ENUMERATED)
return;
result = baAsn1.decodeEnumerated(buffer, offset + apduLen, result.value);
apduLen += result.len;
if (result.value > baEnum.Segmentation.NO_SEGMENTATION)
return;
const segmentation = result.value;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + apduLen);
apduLen += result.len;
if (result.tagNumber !== baEnum.ApplicationTags.UNSIGNED_INTEGER)
return;
result = baAsn1.decodeUnsigned(buffer, offset + apduLen, result.value);
apduLen += result.len;
if (result.value > 0xFFFF)
return;
const vendorId = result.value;
return {
len: offset - orgOffset,
deviceId: deviceId,
maxApdu: maxApdu,
segmentation: segmentation,
vendorId: vendorId
};
};
exports.decode = decode;