int64-buffer
64bit Long Integer on Buffer/Array/ArrayBuffer in Pure JavaScript
JavaScript's number based on IEEE-754 could only handle 53 bits precision.
This module provides two pair of classes: Int64BE
/Uint64BE
and Int64LE
/Uint64LE
which could hold 64 bits long integer and loose no bit.
Features
Int64BE
/Int64LE
for signed integer, Uint64BE
/Uint64LE
for unsigned.Int64BE
/Uint64BE
for big-endian, Uint64BE
/Uint64LE
for little-endian.Buffer
/Uint8Array
/Array
/Array
-like storage of 8 bytes length with offset.- No mathematical methods provided, such as
add()
, sub()
, mul()
, div()
etc. - Optimized only for 64 bits. If you need Int128, use bignum etc.
- Small. 3KB when minified. No other module required. Portable pure JavaScript.
- Tested on node.js v4, v6, v8 and Web browsers.
Usage
Int64BE
is the class to host a 64 bit signed long integer int64_t
.
var Int64BE = require("int64-buffer").Int64BE;
var big = new Int64BE(-1);
console.log(big - 0);
console.log(big.toBuffer());
It uses Buffer
on Node.js and Uint8Array
on modern Web browsers.
Uint64BE
is the class to host a 64 bit unsigned positive long integer uint64_t
.
var Uint64BE = require("int64-buffer").Uint64BE;
var big = new Uint64BE(Math.pow(2, 63));
console.log(big - 0);
console.log(big + "");
Int64LE
and Uint64LE
work as same as above but with little-endian storage.
Input Constructor
var big = new Uint64BE(1234567890);
console.log(big - 0);
var big = new Uint64BE(0x12345678, 0x9abcdef0);
console.log(big.toString(16));
- new Uint64BE(string, radix)
var big = new Uint64BE("123456789abcdef0", 16);
console.log(big.toString(16));
var buffer = new Buffer([1,2,3,4,5,6,7,8]);
var big = new Uint64BE(buffer);
console.log(big.toString(16));
var uint8array = new Uint8Array([1,2,3,4,5,6,7,8]);
var big = new Uint64BE(uint8array);
console.log(big.toString(16));
- new Uint64BE(arraybuffer)
var arraybuffer = (new Uint8Array([1,2,3,4,5,6,7,8])).buffer;
var big = new Uint64BE(arraybuffer);
console.log(big.toString(16));
var array = [1,2,3,4,5,6,7,8];
var big = new Uint64BE(array);
console.log(big.toString(16));
- new Uint64BE(buffer, offset)
var buffer = new Buffer([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]);
var big = new Uint64BE(buffer, 8);
console.log(big.toString(16));
- new Uint64BE(buffer, offset, number)
var buffer = new Buffer(16);
var big = new Uint64BE(buffer, 8, 0x1234567890);
console.log(big.toString(16));
console.log(buffer[15].toString(16));
- new Uint64BE(buffer, offset, high, low)
var buffer = new Uint8Array(16);
var big = new Uint64BE(buffer, 8, 0x12345678, 0x9abcdef0);
console.log(big.toString(16));
console.log(buffer[15].toString(16));
- new Uint64BE(buffer, offset, string, radix)
var buffer = new Array(16);
var big = new Uint64BE(buffer, 8, "123456789abcdef0", 16);
console.log(big.toString(16));
console.log(buffer[15].toString(16));
Output Methods
var big = Uint64BE(1234567890);
console.log(big - 0);
var big = Uint64BE(1234567890);
console.log(big + "");
var big = Uint64BE();
console.log(JSON.stringify({big: big}));
var big = Uint64BE(1234567890);
console.log(big.toNumber());
var big = Uint64BE(0x1234567890);
console.log(big.toString());
console.log(big.toString(16));
var big = Uint64BE([1,2,3,4,5,6,7,8]);
console.log(big.toBuffer());
var big = Uint64BE(0);
var buf = new Int8Array(big.toArrayBuffer());
console.log(buf);
var big = Uint64BE([1,2,3,4,5,6,7,8]);
console.log(big.toArray());
Browsers Build
int64-buffer.min.js is tested on major Web browsers.
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<script src="https://rawgit.com/kawanet/int64-buffer/master/dist/int64-buffer.min.js"></script>
<script>
var i = Int64BE("1234567890123456789");
console.log(i.toString(10));
var u = new Uint64BE([0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
console.log(u.toString(16));
</script>
Installation
npm install int64-buffer --save
GitHub
The MIT License (MIT)
Copyright (c) 2015-2017 Yusuke Kawasaki
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.