Test

main.js

function uint8ArrayToHex(uint8Array) {
  return Array.from(uint8Array)
    .map((byte) => byte.toString(16).padStart(2, "0"))
    .join("");
}

function extractFlagAndPID(inputArray) {
  const first3Bits = inputArray[0] & 0b111;
  const next13Bits = ((inputArray[0] & 0b11111000) << 8) | inputArray[1];

  return {
    flags: first3Bits.toString(16),
    pid: next13Bits.toString(16),
  };
}

try {
  const fileName = "test_success.ts";

  const fileContent = Deno.readFileSync(fileName);

  const packetSize = 188;

  let i = 0;
  const uids = {};

  for (let index = 0; index < fileContent.length / packetSize; index++) {
    i++;
    const offset = index * 188;
    const syncByte = uint8ArrayToHex(fileContent.slice(offset, offset + 1));
    if (syncByte != "47") {
      throw `Error: No sync byte present in packet ${index}, offset ${offset}`;
    }

    const { flags, pid } = extractFlagAndPID(
      fileContent.slice(offset + 1, offset + 3)
    );

    if (!(pid in uids)) {
      uids[pid] = null;
    }
  }

  [...Object.keys(uids)].sort().forEach((pid) => {
    console.log(`0x${pid}`);
  });
  Deno.exit(0);
} catch (error) {
  console.error(error);
  Deno.exit(1);
}