lib/services/write-property.js
'use strict';
const baAsn1 = require('../asn1');
const baEnum = require('../enum');
module.exports.encode = (buffer, objectType, objectInstance, propertyId, arrayIndex, priority, values) => {
baAsn1.encodeContextObjectId(buffer, 0, objectType, objectInstance);
baAsn1.encodeContextEnumerated(buffer, 1, propertyId);
if (arrayIndex !== baEnum.ASN1_ARRAY_ALL) {
baAsn1.encodeContextUnsigned(buffer, 2, arrayIndex);
}
baAsn1.encodeOpeningTag(buffer, 3);
values.forEach((value) => {
baAsn1.bacappEncodeApplicationData(buffer, value);
});
baAsn1.encodeClosingTag(buffer, 3);
if (priority !== baEnum.ASN1_NO_PRIORITY) {
baAsn1.encodeContextUnsigned(buffer, 4, priority);
}
};
module.exports.decode = (buffer, offset, apduLen) => {
let len = 0;
const value = {
property: {}
};
let decodedValue;
let result;
if (!baAsn1.decodeIsContextTag(buffer, offset + len, 0)) return;
len++;
decodedValue = baAsn1.decodeObjectId(buffer, offset + len);
const objectId = {
type: decodedValue.objectType,
instance: decodedValue.instance
};
len += decodedValue.len;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
len += result.len;
if (result.tagNumber !== 1) return;
decodedValue = baAsn1.decodeEnumerated(buffer, offset + len, result.value);
len += decodedValue.len;
value.property.id = decodedValue.value;
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
if (result.tagNumber === 2) {
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue.len;
value.property.index = decodedValue.value;
} else {
value.property.index = baEnum.ASN1_ARRAY_ALL;
}
if (!baAsn1.decodeIsOpeningTagNumber(buffer, offset + len, 3)) return;
len++;
const values = [];
while ((apduLen - len) > 1 && !baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 3)) {
decodedValue = baAsn1.bacappDecodeApplicationData(buffer, offset + len, apduLen + offset, objectId.type, value.property.id);
if (!decodedValue) return;
len += decodedValue.len;
delete decodedValue.len;
values.push(decodedValue);
}
value.value = values;
if (!baAsn1.decodeIsClosingTagNumber(buffer, offset + len, 3)) return;
len++;
value.priority = baEnum.ASN1_MAX_PRIORITY;
if (len < apduLen) {
result = baAsn1.decodeTagNumberAndValue(buffer, offset + len);
if (result.tagNumber === 4) {
len += result.len;
decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value);
len += decodedValue;
if ((decodedValue.value >= baEnum.ASN1_MIN_PRIORITY) && (decodedValue.value <= baEnum.ASN1_MAX_PRIORITY)) {
value.priority = decodedValue.value;
} else {
return;
}
}
}
return {
len: len,
objectId: objectId,
value: value
};
};