Binary Data Control Flow via TypedArray DataView Endianness Parsing

function parseHeaderBuffer(buffer) {
  const view = new DataView(buffer);
  const magicByte = view.getUint8(0);
  
  if (magicByte !== 0x89) {
    return { status: 'REJECTED', reason: 'Invalid header magic byte' };
  }
  
  const isLittleEndian = view.getUint8(1) === 0x01;
  const payloadLength = view.getUint32(2, isLittleEndian);
  
  return { status: 'ACCEPTED', length: payloadLength, littleEndian: isLittleEndian };
}
 
const rawBuffer = new ArrayBuffer(6);
const writer = new DataView(rawBuffer);
writer.setUint8(0, 0x89);
writer.setUint8(1, 0x01);
writer.setUint32(2, 1024, true);
 
console.log(parseHeaderBuffer(rawBuffer));