@crtxio/abi/lib/es/parsers/number.js

A tiny Solidity ABI encoder and decoder

import { concat, fromTwosComplement, toBuffer, toNumber, toTwosComplement } from '../utils';
const NUMBER_REGEX = /^u?int([0-9]*)?$/;
export const isSigned = type => {
  return !type.startsWith('u');
};
export const asNumber = value => {
  if (typeof value === 'bigint') {
    return value;
  }

  return BigInt(value);
};
export const number = {
  isDynamic: false,

  isType(type) {
    return NUMBER_REGEX.test(type);
  },

  encode({
    type,
    buffer,
    value
  }) {
    const number = asNumber(value);

    if (isSigned(type)) {
      return concat([buffer, toTwosComplement(number, 32)]);
    }

    return concat([buffer, toBuffer(number)]);
  },

  decode({
    type,
    value
  }) {
    const buffer = value.slice(0, 32);

    if (isSigned(type)) {
      return fromTwosComplement(buffer);
    }

    return toNumber(buffer);
  }

};
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