Byte32 Decoding

In v2.1 we introduced byte32 encoding for function and event variables (to save storage and gas costs). We provide examples to decode them.

Many parameters (like amountsIn, totalFees in Swap event) are packed with the amounts in for both tokens X and Y and encoded into bytes32. Below is an example of how to decode them.

Typescript

function decodeAmounts(amounts: Bytes): [bigint, bigint] {
  /**
   * Decodes the amounts bytes input as 2 integers.
   *
   * @param amounts - amounts to decode.
   * @return tuple of BigInts with the values decoded.
   */

  // Convert amounts to a BigInt
  const amountsBigInt = BigInt(
    `0x${Buffer.from(amounts, "hex").toString("hex")}`
  );

  // Read the right 128 bits of the 256 bits
  const amountsX = amountsBigInt & (BigInt(2) ** BigInt(128) - BigInt(1));

  // Read the left 128 bits of the 256 bits
  const amountsY = amountsBigInt >> BigInt(128);

  return [amountsX, amountsY];
}

Python

Flipside SQL

DUNE SQL