mirror of
https://github.com/gosticks/DefinitelyTyped.git
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a9f4a8a9e6
* Supports constructing from number * Support the public buffer and offset properties * Support all method signatures of the setValue method
85 lines
2.6 KiB
TypeScript
85 lines
2.6 KiB
TypeScript
// Play example copy
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// First, let's illustrate the problem ...
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(0x123456789).toString(16);
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//!! '123456789' // <- what we expect.
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(0x123456789abcdef0).toString(16);
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//!! '123456789abcdf00' // <- Ugh! JS doesn't do big ints. :(
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// So let's create a couple Int64s using the above values ...
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// Require, of course
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import Int64 = require('node-int64');
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// x's value is what we expect (the decimal value of 0x123456789)
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let x = new Int64(0x123456789);
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//!! [Int64 value:4886718345 octets:00 00 00 01 23 45 67 89]
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// We can set the value as a number
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let a: Int64 = new Int64(64);
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// We can set the value as two numbers representing raw bits
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let b: Int64 = new Int64(73876293, 827235);
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// y's value is Infinity because it's outside the range of integer
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// precision. But that's okay - it's still useful because it's internal
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// representation (octets) is what we passed in
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let y = new Int64('123456789abcdef0');
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//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
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// Get the underlying Buffer object
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let buffer: Buffer = y.buffer;
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// Let's do some math. Int64's behave like Numbers. (Sorry, Int64 isn't
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// for doing 64-bit integer arithmetic (yet) - it's just for carrying
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// around int64 values
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x.toNumber() + 1;
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//!! 4886718346
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y.toNumber() + 1;
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//!! Infinity
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// Int64 string operations ...
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'value: ' + x.toString();
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//!! 'value: 4886718345'
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'value: ' + y.toString();
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//!! 'value: Infinity'
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x.toString(2);
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//!! '100100011010001010110011110001001'
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y.toString(2);
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//!! 'Infinity'
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// Use JS's isFinite() method to see if the Int64 value is in the
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// integer-precise range of JS values
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isFinite(x.toNumber());
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//!! true
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isFinite(y.toNumber());
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//!! false
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// Get an octet string representation. (Yay, y is what we put in!)
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x.toOctetString();
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//!! '0000000123456789'
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y.toOctetString();
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//!! '123456789abcdef0'
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// Finally, some other ways to create Int64s ...
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// Pass hi/lo words
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new Int64(0x12345678, 0x9abcdef0);
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//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
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// Pass a Buffer
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new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0]));
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//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
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// Pass a Buffer and offset
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new Int64(new Buffer([0,0,0,0,0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0]), 4);
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//!! [Int64 value:Infinity octets:12 34 56 78 9a bc de f0]
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// Pull out into a buffer
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new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).toBuffer();
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//!! <Buffer 12 34 56 78 9a bc de f0>
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// Or copy into an existing one (at an offset)
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var buf = new Buffer(1024);
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new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).copy(buf, 512);
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