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45 lines
1.6 KiB
JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.convertHeaderBufferToObj = exports.HEADER_LENGTH = void 0;
exports.HEADER_LENGTH = 6;
/**
* For numbers less than 255, will ensure that their string representation is at least 8 characters long.
*/
const toOctetStr = (num) => {
let str = Number(num).toString(2);
while (str.length < 8) {
str = `0${str}`;
}
return str;
};
/**
* Converts a Buffer of any length to an Object representation of a Space Packet header, provided
* the received data is in the correct format.
* @param buf - The buffer containing the Space Packet Header Data
*/
const convertHeaderBufferToObj = (buf) => {
const headerStr = Array.from(buf.slice(0, exports.HEADER_LENGTH)).reduce((accum, curr) => `${accum}${toOctetStr(curr)}`, '');
const isVersion1 = headerStr.slice(0, 3) === '000';
const versionNumber = isVersion1 ? 1 : 'UNKNOWN_VERSION';
const type = Number(headerStr[3]);
const secondaryHeader = Number(headerStr[4]);
const apid = parseInt(headerStr.slice(5, 16), 2);
const sequenceFlags = parseInt(headerStr.slice(16, 18), 2);
const packetName = parseInt(headerStr.slice(18, 32), 2);
const dataLength = parseInt(headerStr.slice(-16), 2) + 1;
return {
versionNumber,
identification: {
apid,
secondaryHeader,
type,
},
sequenceControl: {
packetName,
sequenceFlags,
},
dataLength,
};
};
exports.convertHeaderBufferToObj = convertHeaderBufferToObj;