Function arrayToBoundedVec

yarn-project/txe/src/util/encoding.ts:101–116

(
  bVecStorage: ForeignCallArray,
  maxLen: number,
)

 * @returns a tuple representing a BoundedVec.
 */
export function arrayToBoundedVec(
  bVecStorage: ForeignCallArray,
  maxLen: number,
): [ForeignCallArray, ForeignCallSingle] {
  if (bVecStorage.length > maxLen) {
    throw new Error(`Array of length ${bVecStorage.length} larger than maxLen ${maxLen}`);
  }
  const lengthDiff = maxLen - bVecStorage.length;
  // We pad the array to the maxLen of the BoundedVec.
  const zeroPaddingArray = toArray(Array(lengthDiff).fill(new Fr(0)));

  // These variable names match with the BoundedVec members in nr:
  const storage = bVecStorage.concat(zeroPaddingArray);
  const len = toSingle(new Fr(bVecStorage.length));
  return [storage, len];
}

/**
 * Converts an array of arrays representing Noir BoundedVec of nested arrays into its Noir serialized form.