Method FromBigEndian

cpp/src/arrow/util/decimal.cc:1104–1120

}

Result<Decimal32> Decimal32::FromBigEndian(const uint8_t* bytes, int32_t length) {
  static constexpr int32_t kMinDecimalBytes = 1;
  static constexpr int32_t kMaxDecimalBytes = 4;

  if (ARROW_PREDICT_FALSE(length < kMinDecimalBytes || length > kMaxDecimalBytes)) {
    return Status::Invalid("Length of byte array passed to Decimal32::FromBigEndian was ",
                           length, ", but must be between ", kMinDecimalBytes, " and ",
                           kMaxDecimalBytes);
  }

  const bool is_negative = static_cast<int8_t>(bytes[0]) < 0;
  int32_t result = is_negative ? 0xffffffff : 0;
  memcpy(reinterpret_cast<uint8_t*>(&result) + kMaxDecimalBytes - length, bytes, length);

  const auto value = bit_util::FromBigEndian(result);
  return Decimal32(value);
}

ARROW_EXPORT std::ostream& operator<<(std::ostream& os, const Decimal32& decimal) {
  os << decimal.ToIntegerString();