234 lines
8.2 KiB
JavaScript
234 lines
8.2 KiB
JavaScript
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/* global describe, it */
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var assert = require('assert');
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var BN = require('../').BN;
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describe('BN.js/Binary', function () {
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describe('.shl()', function () {
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it('should shl numbers', function () {
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// TODO(indutny): add negative numbers when the time will come
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assert.equal(new BN('69527932928').shln(13).toString(16),
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'2060602000000');
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assert.equal(new BN('69527932928').shln(45).toString(16),
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'206060200000000000000');
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});
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it('should ushl numbers', function () {
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assert.equal(new BN('69527932928').ushln(13).toString(16),
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'2060602000000');
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assert.equal(new BN('69527932928').ushln(45).toString(16),
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'206060200000000000000');
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});
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});
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describe('.shr()', function () {
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it('should shr numbers', function () {
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// TODO(indutny): add negative numbers when the time will come
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assert.equal(new BN('69527932928').shrn(13).toString(16),
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'818180');
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assert.equal(new BN('69527932928').shrn(17).toString(16),
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'81818');
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assert.equal(new BN('69527932928').shrn(256).toString(16),
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'0');
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});
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it('should ushr numbers', function () {
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assert.equal(new BN('69527932928').ushrn(13).toString(16),
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'818180');
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assert.equal(new BN('69527932928').ushrn(17).toString(16),
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'81818');
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assert.equal(new BN('69527932928').ushrn(256).toString(16),
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'0');
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});
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});
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describe('.bincn()', function () {
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it('should increment bit', function () {
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assert.equal(new BN(0).bincn(1).toString(16), '2');
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assert.equal(new BN(2).bincn(1).toString(16), '4');
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assert.equal(new BN(2).bincn(1).bincn(1).toString(16),
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new BN(2).bincn(2).toString(16));
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assert.equal(new BN(0xffffff).bincn(1).toString(16), '1000001');
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assert.equal(new BN(2).bincn(63).toString(16),
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'8000000000000002');
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});
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});
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describe('.imaskn()', function () {
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it('should mask bits in-place', function () {
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assert.equal(new BN(0).imaskn(1).toString(16), '0');
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assert.equal(new BN(3).imaskn(1).toString(16), '1');
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assert.equal(new BN('123456789', 16).imaskn(4).toString(16), '9');
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assert.equal(new BN('123456789', 16).imaskn(16).toString(16), '6789');
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assert.equal(new BN('123456789', 16).imaskn(28).toString(16), '3456789');
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});
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it('should not mask when number is bigger than length', function () {
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assert.equal(new BN(0xe3).imaskn(56).toString(16), 'e3');
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assert.equal(new BN(0xe3).imaskn(26).toString(16), 'e3');
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});
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});
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describe('.testn()', function () {
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it('should support test specific bit', function () {
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[
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'ff',
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'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
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].forEach(function (hex) {
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var bn = new BN(hex, 16);
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var bl = bn.bitLength();
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for (var i = 0; i < bl; ++i) {
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assert.equal(bn.testn(i), true);
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}
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// test off the end
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assert.equal(bn.testn(bl), false);
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});
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var xbits = '01111001010111001001000100011101' +
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'11010011101100011000111001011101' +
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'10010100111000000001011000111101' +
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'01011111001111100100011110000010' +
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'01011010100111010001010011000100' +
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'01101001011110100001001111100110' +
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'001110010111';
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var x = new BN(
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'23478905234580795234378912401239784125643978256123048348957342'
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);
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for (var i = 0; i < x.bitLength(); ++i) {
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assert.equal(x.testn(i), (xbits.charAt(i) === '1'), 'Failed @ bit ' + i);
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}
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});
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it('should have short-cuts', function () {
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var x = new BN('abcd', 16);
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assert(!x.testn(128));
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});
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});
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describe('.and()', function () {
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it('should and numbers', function () {
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assert.equal(new BN('1010101010101010101010101010101010101010', 2)
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.and(new BN('101010101010101010101010101010101010101', 2))
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.toString(2), '0');
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});
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it('should and numbers of different limb-length', function () {
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assert.equal(
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new BN('abcd0000ffff', 16)
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.and(new BN('abcd', 16)).toString(16),
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'abcd');
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});
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});
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describe('.iand()', function () {
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it('should iand numbers', function () {
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assert.equal(new BN('1010101010101010101010101010101010101010', 2)
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.iand(new BN('101010101010101010101010101010101010101', 2))
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.toString(2), '0');
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assert.equal(new BN('1000000000000000000000000000000000000001', 2)
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.iand(new BN('1', 2))
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.toString(2), '1');
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assert.equal(new BN('1', 2)
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.iand(new BN('1000000000000000000000000000000000000001', 2))
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.toString(2), '1');
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});
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});
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describe('.or()', function () {
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it('should or numbers', function () {
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assert.equal(new BN('1010101010101010101010101010101010101010', 2)
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.or(new BN('101010101010101010101010101010101010101', 2))
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.toString(2), '1111111111111111111111111111111111111111');
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});
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it('should or numbers of different limb-length', function () {
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assert.equal(
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new BN('abcd00000000', 16)
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.or(new BN('abcd', 16)).toString(16),
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'abcd0000abcd');
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});
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});
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describe('.ior()', function () {
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it('should ior numbers', function () {
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assert.equal(new BN('1010101010101010101010101010101010101010', 2)
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.ior(new BN('101010101010101010101010101010101010101', 2))
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.toString(2), '1111111111111111111111111111111111111111');
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assert.equal(new BN('1000000000000000000000000000000000000000', 2)
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.ior(new BN('1', 2))
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.toString(2), '1000000000000000000000000000000000000001');
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assert.equal(new BN('1', 2)
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.ior(new BN('1000000000000000000000000000000000000000', 2))
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.toString(2), '1000000000000000000000000000000000000001');
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});
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});
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describe('.xor()', function () {
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it('should xor numbers', function () {
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assert.equal(new BN('11001100110011001100110011001100', 2)
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.xor(new BN('1100110011001100110011001100110', 2))
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.toString(2), '10101010101010101010101010101010');
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});
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});
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describe('.ixor()', function () {
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it('should ixor numbers', function () {
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assert.equal(new BN('11001100110011001100110011001100', 2)
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.ixor(new BN('1100110011001100110011001100110', 2))
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.toString(2), '10101010101010101010101010101010');
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assert.equal(new BN('11001100110011001100110011001100', 2)
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.ixor(new BN('1', 2))
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.toString(2), '11001100110011001100110011001101');
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assert.equal(new BN('1', 2)
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.ixor(new BN('11001100110011001100110011001100', 2))
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.toString(2), '11001100110011001100110011001101');
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});
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it('should and numbers of different limb-length', function () {
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assert.equal(
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new BN('abcd0000ffff', 16)
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.xor(new BN('abcd', 16)).toString(16),
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'abcd00005432');
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});
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});
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describe('.setn()', function () {
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it('should allow single bits to be set', function () {
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assert.equal(new BN(0).setn(2, true).toString(2), '100');
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assert.equal(new BN(0).setn(27, true).toString(2),
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'1000000000000000000000000000');
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assert.equal(new BN(0).setn(63, true).toString(16),
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new BN(1).iushln(63).toString(16));
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assert.equal(new BN('1000000000000000000000000001', 2).setn(27, false)
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.toString(2), '1');
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assert.equal(new BN('101', 2).setn(2, false).toString(2), '1');
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});
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});
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describe('.notn()', function () {
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it('should allow bitwise negation', function () {
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assert.equal(new BN('111000111', 2).notn(9).toString(2),
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'111000');
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assert.equal(new BN('000111000', 2).notn(9).toString(2),
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'111000111');
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assert.equal(new BN('111000111', 2).notn(9).toString(2),
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'111000');
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assert.equal(new BN('000111000', 2).notn(9).toString(2),
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'111000111');
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assert.equal(new BN('111000111', 2).notn(32).toString(2),
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'11111111111111111111111000111000');
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assert.equal(new BN('000111000', 2).notn(32).toString(2),
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'11111111111111111111111111000111');
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assert.equal(new BN('111000111', 2).notn(68).toString(2),
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'11111111111111111111111111111111' +
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'111111111111111111111111111000111000');
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assert.equal(new BN('000111000', 2).notn(68).toString(2),
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'11111111111111111111111111111111' +
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'111111111111111111111111111111000111');
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});
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});
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});
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