int64_t

0.10.1 • Public • Published

int64_t

64bit integer in pure Javascript

License: MIT CircleCI

Usage

Int64 is the class which is a 64bit signed interger. UInt64 is the class which is a 64bit unsigned interger.

const { Int64, UInt64 } = require('int64_t');
let i = new Int64(0x12345678, 0x9abcdef0);
console.log(i.toString());  // 1311768467463790320

Constructor

Int64 & UInt64

  • new Int64(buffer)
let i = new Int64(Buffer.from([
  0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0
]);
  • new Int64(high, low)
let i = new Int64(0x12345678, 0x9abcdef0);

⚠️ negative number is unacceptable

  • new Int64(int)
let i = new Int64(0x123456789)

⚠️ up to 2^53 - 1

Feature

Four arithmetic operations

  • add(int64) (+)
let i1 = new Int64(0x12345678, 0x9abcdef0);
let i2 = new Int64(0x11111111, 0x11111111);
console.log(i1.add(i2).toString(16, true));  // 0x23456789abcdf001
  • sub(int64) (-)
let i1 = new Int64(0x12345678, 0x9abcdef0);
let i2 = new Int64(0x11111111, 0x11111111);
console.log(i1.sub(i2).toString(16, true));  // 0x123456789abcddf
  • mul(int64) (*)
let i1 = new Int64(0xf, 0x1234567678);
let i2 = new Int64(0x0, 0xf);
console.log(i1.mul(i2).toString(16, true));  // 0xe211111108
  • div(int64) (/)
let i1 = new Int64(0x12345678, 0x9abcdef0);
let i2 = new Int64(0x0, 0xf);
console.log(i1.div(i2).toString(16, true));  // 0x136b06e70b74210
  • mod(int64) (%)
let i1 = new Int64(0x12345678, 0x9abcdef0);
let i2 = new Int64(0x0, 0xe);
console.log(i1.mod(i2).toString(16, true));  // 0xc

Bit operations

  • and(int64) (&)
let i = new UInt64(0x12345678, 0x9abcdef0);
console.log(i.add(new UInt64(0x0f0f0f0f, 0x0f0f0f0f)).toString(16, true));  // 0x020406080a0c0e00
  • or(int64) (|)
let i = new UInt64(0x12345678, 0x9abcdef0);
console.log(i.or(new UInt64(0x0f0f0f0f, 0x0f0f0f0f)).toString(16, true));  // 0x1f3f5f7f9fbfdfff
  • xor(int64) (^)
let i = new UInt64(0x12345678, 0x9abcdef0);
console.log(i.xor(new UInt64(0xffffffff, 0xffffffff)).toString(16, true));  // 0xedcba9876543210f
  • shiftRight(number, logical) (>>, >>>)
let i = new Int64(0x89abcdef, 0x01234567);
console.log(i.toShiftRight(1).toString(16, true));  // -0x3b2a19087f6e5d4d
console.log(i.toShiftRight(1, true).toString(16, true));  // 0x44d5e6f78091a2b3
  • shiftLeft(number) (<<)
let i = new Int64(0x12345678, 0x9abcdef0);
console.log(i.toShiftLeft(1).toString(16, true));  // 0x2468acf13579bde0

Other operation

  • equal(i)
let i = new UInt64(0x12345678, 0x9abcdef0);
console.log(i.equal(new UInt64(0x12345678, 0x9abcdef0)));  // bool: true
console.log(i.equal(new UInt64(0x12345678, 0x9abcdef1)));  // bool: false
console.log(i.equal(new UInt64(0x12345679, 0x9abcdef0)));  // bool: false
console.log(i.equal(new Int64(0x12345678, 0x9abcdef0)));  // bool: false
  • compare(i)
let i = new UInt64(0x12345678, 0x9abcdef0);
console.log(i.compare(new UInt64(0x12345678, 0x0)));  // 1
console.log(i.compare(new UInt64(0x20000000, 0x0)));  // -1
console.log(i.compare(new UInt64(0x12345678, 0x9abcdef0)));  // 0

Transform

  • toString(radix, prefix) default radix is 10 default prefix is false
let i = new Int64(0x12345678, 0x9abcdef0);
console.log(i.toString());  //
console.log(i.toString(16));  // 123456789abcdef0
console.log(i.toString(16, true);  // 0x123456789abcdef0
  • toBuffer()
let i = new Int64(0x12345678, 0x9abcdef0);
console.log(i.toBuffer());  // <Buffer 12 34 56 78 9a bc de f0>
  • toUnsigned(), toSigned()
let i = new Int64(0x12345678, 0x9abcdef0);
let ui = i.toUnsigned();
console.log(ui);  // UInt64 { buffer: <Buffer 12 34 56 78 9a bc de f0> }
console.log(ui.toSigned());  // Int64 { buffer: <Buffer 12 34 56 78 9a bc de f0> }
  • toNegative() (only Int64)
let i = new Int64(0x12345678, 0x9abcdef0);
console.log(i.toNegative());  // Int64 { buffer: <Buffer ed cb a9 87 65 43 21 10> }
  • isNegative() (only Int64)
let i = new Int64(0x890abcde, 0xf1234567)
console.log(i.isNegative());  // bool: true

License

MIT

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Install

npm i int64_t

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Version

0.10.1

License

MIT

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  • gucchisk