/** Parse a hex dump string into byte values. Whitespace is ignored. */
export function parseHexInput(hex: string): number[] {
  const clean = hex.replace(/\s/g, '')
  if (clean.length % 2 !== 0) return []
  const out: number[] = []
  for (let i = 0; i < clean.length; i += 2) {
    const b = parseInt(clean.slice(i, i + 2), 16)
    if (Number.isNaN(b)) return []
    out.push(b)
  }
  return out
}

/** Format bytes as uppercase hex pairs separated by spaces. */
export function formatHexBytes(bytes: number[]): string {
  return bytes.map(b => b.toString(16).padStart(2, '0').toUpperCase()).join(' ')
}