/**
 * Compresses an action list into a Uint8Array of variable-length 8/13-bit integers.
 *
 * Action codes <32 are invalid.
 */
export function compressActions(actions: number[]): Uint8Array {
  const buffer = new Uint8Array(actions.length * 2)
  let i = 0
  for (const action of actions) {
    if (action > 0xff) {
      buffer[i++] = action >>> 8
    }
    buffer[i++] = action & 0xff
  }
  return buffer.slice(0, i)
}

/**
 * Decompresses actions
 *
 * @see {compressActions}
 */
export function decompressActions(raw: Uint8Array): number[] {
  const actions: number[] = []
  for (let i = 0; i < raw.length; i++) {
    let action = raw[i]
    if (action > 0 && action < 32) {
      action = (action << 8) | raw[++i]
    }
    actions.push(action)
  }
  return actions
}