@halsystems/red-bacnet
Version:
NodeRED BACnet IP client
106 lines (105 loc) • 4.02 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.encodeObject = exports.decode = exports.encode = void 0;
const baAsn1 = require("../asn1");
const baEnum = require("../enum");
const encode = (buffer, objectId, values) => {
baAsn1.encodeContextObjectId(buffer, 0, objectId.type, objectId.instance);
baAsn1.encodeOpeningTag(buffer, 1);
values.forEach((pValue) => {
baAsn1.encodeContextEnumerated(buffer, 0, pValue.property.id);
if (pValue.property.index !== baEnum.ASN1_ARRAY_ALL) {
baAsn1.encodeContextUnsigned(buffer, 1, pValue.property.index);
}
baAsn1.encodeOpeningTag(buffer, 2);
pValue.value.forEach((value) => baAsn1.bacappEncodeApplicationData(buffer, value));
baAsn1.encodeClosingTag(buffer, 2);
if (pValue.priority !== baEnum.ASN1_NO_PRIORITY) {
baAsn1.encodeContextUnsigned(buffer, 3, pValue.priority);
}
});
baAsn1.encodeClosingTag(buffer, 1);
};
exports.encode = encode;
const decode = (buffer, offset, apduLen) => {
let len = 0;
let result;
let decodedValue;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if ((result.tagNumber !== 0) || (apduLen <= len))
return;
apduLen -= len;
if (apduLen < 4)
return;
decodedValue = baAsn1.decodeObjectId(buffer, offset + len);
len += decodedValue.len;
const objectId = {
type: decodedValue.objectType,
instance: decodedValue.instance
};
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 1))
return;
len++;
const _values = [];
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 arrayIndex = 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;
arrayIndex = decodedValue.value;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
}
newEntry.property = { id: propertyId, index: arrayIndex };
if ((result.tagNumber !== 2) || (!baAsn1.decodeIsOpeningTag(buffer, offset + len - 1)))
return;
const values = [];
while ((len + offset) <= buffer.length && !baAsn1.decodeIsClosingTag(buffer, offset + len)) {
const value = baAsn1.bacappDecodeApplicationData(buffer, offset + len, apduLen + offset, objectId.type, propertyId);
if (!value)
return;
len += value.len;
delete value.len;
values.push(value);
}
len++;
newEntry.value = values;
let priority = baEnum.ASN1_NO_PRIORITY;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if (result.tagNumber === 3) {
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
priority = decodedValue.value;
}
else {
len--;
}
newEntry.priority = priority;
_values.push(newEntry);
}
if (!baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 1))
return;
len++;
return {
len: len,
objectId: objectId,
values: _values
};
};
exports.decode = decode;
const encodeObject = (buffer, values) => {
values.forEach((object) => (0, exports.encode)(buffer, object.objectId, object.values));
};
exports.encodeObject = encodeObject;