mirror of
https://github.com/gosticks/DefinitelyTyped.git
synced 2025-10-16 12:05:41 +00:00
80 lines
2.3 KiB
TypeScript
80 lines
2.3 KiB
TypeScript
/// <reference types="node" />
|
|
|
|
// Play example copy
|
|
|
|
|
|
|
|
// First, let's illustrate the problem ...
|
|
(0x123456789).toString(16);
|
|
//!! '123456789' // <- what we expect.
|
|
(0x123456789abcdef0).toString(16);
|
|
//!! '123456789abcdf00' // <- Ugh! JS doesn't do big ints. :(
|
|
|
|
// So let's create a couple Int64s using the above values ...
|
|
|
|
// Require, of course
|
|
let Int64 = require('node-int64');
|
|
|
|
// x's value is what we expect (the decimal value of 0x123456789)
|
|
let x = new Int64(0x123456789);
|
|
//!! [Int64 value:4886718345 octets:00 00 00 01 23 45 67 89]
|
|
|
|
// y's value is Infinity because it's outside the range of integer
|
|
// precision. But that's okay - it's still useful because it's internal
|
|
// representation (octets) is what we passed in
|
|
let y = new Int64('123456789abcdef0');
|
|
//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
|
|
|
|
// Let's do some math. Int64's behave like Numbers. (Sorry, Int64 isn't
|
|
// for doing 64-bit integer arithmetic (yet) - it's just for carrying
|
|
// around int64 values
|
|
x + 1;
|
|
//!! 4886718346
|
|
y + 1;
|
|
//!! Infinity
|
|
|
|
// Int64 string operations ...
|
|
'value: ' + x;
|
|
//!! 'value: 4886718345'
|
|
'value: ' + y;
|
|
//!! 'value: Infinity'
|
|
x.toString(2);
|
|
//!! '100100011010001010110011110001001'
|
|
y.toString(2);
|
|
//!! 'Infinity'
|
|
|
|
// Use JS's isFinite() method to see if the Int64 value is in the
|
|
// integer-precise range of JS values
|
|
isFinite(x);
|
|
//!! true
|
|
isFinite(y);
|
|
//!! false
|
|
|
|
// Get an octet string representation. (Yay, y is what we put in!)
|
|
x.toOctetString();
|
|
//!! '0000000123456789'
|
|
y.toOctetString();
|
|
//!! '123456789abcdef0'
|
|
|
|
// Finally, some other ways to create Int64s ...
|
|
|
|
// Pass hi/lo words
|
|
new Int64(0x12345678, 0x9abcdef0);
|
|
//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
|
|
|
|
// Pass a Buffer
|
|
new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0]));
|
|
//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
|
|
|
|
// Pass a Buffer and offset
|
|
new Int64(new Buffer([0,0,0,0,0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0]), 4);
|
|
//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
|
|
|
|
// Pull out into a buffer
|
|
new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).toBuffer();
|
|
//!! <Buffer 12 34 56 78 9a bc de f0>
|
|
|
|
// Or copy into an existing one (at an offset)
|
|
var buf = new Buffer(1024);
|
|
new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).copy(buf, 512);
|