Package Exports

int64-buffer

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (int64-buffer) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

int64-buffer

64bit Long Integer on Buffer/ArrayBuffer in Pure JavaScript

JavaScript's number based on IEEE-754 could only handle 53 bits precision. This module provides a couple of classes: Int64BE and Uint64BE. Both could keep 64 bits long integer and loose no bit.

Features

Int64 for signed 64bit long integer and Uint64 for unsigned.
Big endian representation in 8 bytes internal buffer.
Buffer object is used per default on Node.js.
Int8Array or Array object is used per default on Web browsers.
No math methods such as add(), sub(), mul(), div() etc.
Optimized only for 64 bits. If you need Int128, use bignum etc.
Tested on node.js-v0.10, v0.12, io.js-v3.3 and Web browsers.

Usage

Int64BE constructor accepts a number.

var Int64BE = require("int64-buffer").Int64BE;

var big = new Int64BE(-1);

console.log(big - 0); // -1

Uint64BE constructor accepts a positive number.

var Uint64BE = require("int64-buffer").Uint64BE;

var big = new Uint64BE(Math.pow(2, 63));

console.log(big - 0); // 9223372036854776000

Both also accept a string representation for bigger number.

var big = Int64BE("1234567890123456789");

console.log(big.toString(10)); // "1234567890123456789"

console.log(big.toJSON()); // "1234567890123456789" as string

Both accept an Array or Array-like object with 8 elements as well.

var big = new Uint64BE([0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);

console.log(big.toString(16)); // "123456789abcdef"

console.log(big.toBuffer()); // <Buffer 01 23 45 67 89 ab cd ef>

console.log(big.toArrayBuffer().byteLength); // 8

console.log(big.toArray()); // [ 1, 35, 69, 103, 137, 171, 205, 239 ]

Browsers Build

int64-buffer.min.js supports modern Web browsers as well as legends of IE8. It's only 2KB minified, 1KB gzipped.

<meta http-equiv="X-UA-Compatible" content="IE=edge">
<script src="https://rawgithub.com/kawanet/int64-buffer/master/dist/int64-buffer.min.js"></script>
<script>

  var i = Int64BE("1234567890123456789");
  console.log(i.toString(10)); // "1234567890123456789"
  
  var u = new Uint64BE([0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
  console.log(u.toString(16)); // "123456789abcdef"

</script>

Installation

npm install int64-buffer --save

GitHub

https://github.com/kawanet/int64-buffer

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.