Function QuickUpdatePageAad

cpp/src/parquet/encryption/encryption_internal.cc:757–762

Update last two bytes with new page ordinal (instead of creating new page AAD from scratch)

// Update last two bytes with new page ordinal (instead of creating new page AAD
// from scratch)
void QuickUpdatePageAad(int32_t new_page_ordinal, std::string* AAD) {
  CheckPageOrdinal(new_page_ordinal);
  const std::string page_ordinal_bytes =
      ShortToBytesLe(static_cast<int16_t>(new_page_ordinal));
  std::memcpy(AAD->data() + AAD->length() - 2, page_ordinal_bytes.data(), 2);
}

void RandBytes(unsigned char* buf, size_t num) {
  if (num > static_cast<size_t>(std::numeric_limits<int>::max())) {