icon.ts

import { toBigIntBE, toBufferBE } from 'bigint-buffer';

export function encode(hash: string) {
  const buffer = Buffer.from(hash, "hex");

  return [toBigIntBE(buffer.slice(0, 8)), toBigIntBE(buffer.slice(8, 16))];
}

export function decode(first: bigint, second: bigint) {
  const buffer1 = toBufferBE(first, 8);
  const buffer2 = toBufferBE(second, 8);

  return buffer1.toString('hex') + buffer2.toString('hex');
}