Function readDecimal

javascript/packages/core/lib/compatible/scalar.ts:148–171

(reader: BinaryReader)

}

function readDecimal(reader: BinaryReader): Decimal {
  const scale = reader.readVarInt32();
  const header = reader.readVarUInt64();
  if ((header & 1n) === 0n) {
    return new Decimal(DecimalCodec.decodeZigZag64(header >> 1n), scale);
  }
  const meta = header >> 1n;
  const length = Number(meta >> 1n);
  if (length <= 0 || length > 0x7fffffff) {
    throw new Error(`Invalid decimal magnitude length ${length}.`);
  }
  const magnitudeBytes = reader.buffer(length);
  if (magnitudeBytes[length - 1] === 0) {
    throw new Error(
      "Non-canonical decimal magnitude bytes: trailing zero byte.",
    );
  }
  const magnitude
    = DecimalCodec.fromCanonicalLittleEndianMagnitude(magnitudeBytes);
  if (magnitude === 0n) {
    throw new Error("Big decimal encoding must not represent zero.");
  }
  return new Decimal((meta & 1n) === 0n ? magnitude : -magnitude, scale);
}

function pow10(exp: number): bigint {
  let result = 1n;