@chainsafe/eth2.0-utils/lib/bytes.js

Utilities required across multiple lodestar packages

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.intToBytes = intToBytes;
exports.bytesToInt = bytesToInt;
exports.bytesToBigInt = bytesToBigInt;
exports.toHex = toHex;

var _bigintBuffer = require("bigint-buffer");

/**
 * Return a byte array from a number or BigInt
 */
function intToBytes(value, length) {
  if (typeof value === "number" && length <= 6) {
    // value is a number and length is at most 6 bytes
    const b = Buffer.alloc(length);
    b.writeUIntLE(value, 0, length);
    return b;
  } else {
    // value is number and is too large, or a BigInt
    value = BigInt(value);
    return (0, _bigintBuffer.toBufferLE)(value, length);
  }
}
/**
 * Convert byte array in LE to integer.
 */


function bytesToInt(value) {
  const length = value.length;
  let result = 0;

  for (let i = 0; i < length; i++) {
    result += value[i] * 2 ** (8 * i);
  }

  return result;
}

function bytesToBigInt(value) {
  return (0, _bigintBuffer.toBigIntLE)(value);
}

function toHex(buffer) {
  return "0x" + buffer.toString("hex");
}
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