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523 lines
19 KiB
523 lines
19 KiB
'use strict'; |
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var Buffer = require('../../').Buffer; |
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var assert = require('assert'); |
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|
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var Buffer = require('../../').Buffer; |
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|
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var b = Buffer.from('abcdef'); |
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var buf_a = Buffer.from('a'); |
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var buf_bc = Buffer.from('bc'); |
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var buf_f = Buffer.from('f'); |
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var buf_z = Buffer.from('z'); |
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var buf_empty = Buffer.from(''); |
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|
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assert.equal(b.indexOf('a'), 0); |
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assert.equal(b.indexOf('a', 1), -1); |
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assert.equal(b.indexOf('a', -1), -1); |
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assert.equal(b.indexOf('a', -4), -1); |
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assert.equal(b.indexOf('a', -b.length), 0); |
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assert.equal(b.indexOf('a', NaN), 0); |
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assert.equal(b.indexOf('a', -Infinity), 0); |
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assert.equal(b.indexOf('a', Infinity), -1); |
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assert.equal(b.indexOf('bc'), 1); |
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assert.equal(b.indexOf('bc', 2), -1); |
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assert.equal(b.indexOf('bc', -1), -1); |
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assert.equal(b.indexOf('bc', -3), -1); |
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assert.equal(b.indexOf('bc', -5), 1); |
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assert.equal(b.indexOf('bc', NaN), 1); |
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assert.equal(b.indexOf('bc', -Infinity), 1); |
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assert.equal(b.indexOf('bc', Infinity), -1); |
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assert.equal(b.indexOf('f'), b.length - 1); |
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assert.equal(b.indexOf('z'), -1); |
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assert.equal(b.indexOf(''), -1); |
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assert.equal(b.indexOf('', 1), -1); |
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assert.equal(b.indexOf('', b.length + 1), -1); |
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assert.equal(b.indexOf('', Infinity), -1); |
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assert.equal(b.indexOf(buf_a), 0); |
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assert.equal(b.indexOf(buf_a, 1), -1); |
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assert.equal(b.indexOf(buf_a, -1), -1); |
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assert.equal(b.indexOf(buf_a, -4), -1); |
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assert.equal(b.indexOf(buf_a, -b.length), 0); |
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assert.equal(b.indexOf(buf_a, NaN), 0); |
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assert.equal(b.indexOf(buf_a, -Infinity), 0); |
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assert.equal(b.indexOf(buf_a, Infinity), -1); |
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assert.equal(b.indexOf(buf_bc), 1); |
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assert.equal(b.indexOf(buf_bc, 2), -1); |
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assert.equal(b.indexOf(buf_bc, -1), -1); |
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assert.equal(b.indexOf(buf_bc, -3), -1); |
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assert.equal(b.indexOf(buf_bc, -5), 1); |
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assert.equal(b.indexOf(buf_bc, NaN), 1); |
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assert.equal(b.indexOf(buf_bc, -Infinity), 1); |
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assert.equal(b.indexOf(buf_bc, Infinity), -1); |
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assert.equal(b.indexOf(buf_f), b.length - 1); |
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assert.equal(b.indexOf(buf_z), -1); |
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assert.equal(b.indexOf(buf_empty), -1); |
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assert.equal(b.indexOf(buf_empty, 1), -1); |
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assert.equal(b.indexOf(buf_empty, b.length + 1), -1); |
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assert.equal(b.indexOf(buf_empty, Infinity), -1); |
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assert.equal(b.indexOf(0x61), 0); |
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assert.equal(b.indexOf(0x61, 1), -1); |
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assert.equal(b.indexOf(0x61, -1), -1); |
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assert.equal(b.indexOf(0x61, -4), -1); |
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assert.equal(b.indexOf(0x61, -b.length), 0); |
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assert.equal(b.indexOf(0x61, NaN), 0); |
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assert.equal(b.indexOf(0x61, -Infinity), 0); |
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assert.equal(b.indexOf(0x61, Infinity), -1); |
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assert.equal(b.indexOf(0x0), -1); |
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|
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// test offsets |
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assert.equal(b.indexOf('d', 2), 3); |
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assert.equal(b.indexOf('f', 5), 5); |
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assert.equal(b.indexOf('f', -1), 5); |
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assert.equal(b.indexOf('f', 6), -1); |
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assert.equal(b.indexOf(Buffer.from('d'), 2), 3); |
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assert.equal(b.indexOf(Buffer.from('f'), 5), 5); |
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assert.equal(b.indexOf(Buffer.from('f'), -1), 5); |
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assert.equal(b.indexOf(Buffer.from('f'), 6), -1); |
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assert.equal(Buffer.from('ff').indexOf(Buffer.from('f'), 1, 'ucs2'), -1); |
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|
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// test hex encoding |
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assert.strictEqual( |
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Buffer.from(b.toString('hex'), 'hex') |
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.indexOf('64', 0, 'hex'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from(b.toString('hex'), 'hex') |
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.indexOf(Buffer.from('64', 'hex'), 0, 'hex'), |
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3 |
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); |
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|
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// test base64 encoding |
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assert.strictEqual( |
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Buffer.from(b.toString('base64'), 'base64') |
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.indexOf('ZA==', 0, 'base64'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from(b.toString('base64'), 'base64') |
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.indexOf(Buffer.from('ZA==', 'base64'), 0, 'base64'), |
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3 |
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); |
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|
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// test ascii encoding |
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assert.strictEqual( |
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Buffer.from(b.toString('ascii'), 'ascii') |
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.indexOf('d', 0, 'ascii'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from(b.toString('ascii'), 'ascii') |
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.indexOf(Buffer.from('d', 'ascii'), 0, 'ascii'), |
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3 |
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); |
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|
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// test latin1 encoding |
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assert.strictEqual( |
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Buffer.from(b.toString('latin1'), 'latin1') |
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.indexOf('d', 0, 'latin1'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from(b.toString('latin1'), 'latin1') |
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.indexOf(Buffer.from('d', 'latin1'), 0, 'latin1'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from('aa\u00e8aa', 'latin1') |
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.indexOf('\u00e8', 'latin1'), |
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2 |
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); |
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assert.strictEqual( |
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Buffer.from('\u00e8', 'latin1') |
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.indexOf('\u00e8', 'latin1'), |
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0 |
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); |
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assert.strictEqual( |
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Buffer.from('\u00e8', 'latin1') |
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.indexOf(Buffer.from('\u00e8', 'latin1'), 'latin1'), |
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0 |
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); |
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|
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// test binary encoding |
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assert.strictEqual( |
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Buffer.from(b.toString('binary'), 'binary') |
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.indexOf('d', 0, 'binary'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from(b.toString('binary'), 'binary') |
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.indexOf(Buffer.from('d', 'binary'), 0, 'binary'), |
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3 |
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); |
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assert.strictEqual( |
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Buffer.from('aa\u00e8aa', 'binary') |
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.indexOf('\u00e8', 'binary'), |
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2 |
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); |
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assert.strictEqual( |
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Buffer.from('\u00e8', 'binary') |
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.indexOf('\u00e8', 'binary'), |
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0 |
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); |
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assert.strictEqual( |
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Buffer.from('\u00e8', 'binary') |
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.indexOf(Buffer.from('\u00e8', 'binary'), 'binary'), |
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0 |
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); |
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// test optional offset with passed encoding |
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assert.equal(Buffer.from('aaaa0').indexOf('30', 'hex'), 4); |
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assert.equal(Buffer.from('aaaa00a').indexOf('3030', 'hex'), 4); |
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{ |
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// test usc2 encoding |
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var twoByteString = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'ucs2'); |
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assert.equal(8, twoByteString.indexOf('\u0395', 4, 'ucs2')); |
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assert.equal(6, twoByteString.indexOf('\u03a3', -4, 'ucs2')); |
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assert.equal(4, twoByteString.indexOf('\u03a3', -6, 'ucs2')); |
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assert.equal(4, twoByteString.indexOf( |
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Buffer.from('\u03a3', 'ucs2'), -6, 'ucs2')); |
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assert.equal(-1, twoByteString.indexOf('\u03a3', -2, 'ucs2')); |
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} |
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var mixedByteStringUcs2 = |
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Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395', 'ucs2'); |
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assert.equal(6, mixedByteStringUcs2.indexOf('bc', 0, 'ucs2')); |
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assert.equal(10, mixedByteStringUcs2.indexOf('\u03a3', 0, 'ucs2')); |
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assert.equal(-1, mixedByteStringUcs2.indexOf('\u0396', 0, 'ucs2')); |
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assert.equal( |
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6, mixedByteStringUcs2.indexOf(Buffer.from('bc', 'ucs2'), 0, 'ucs2')); |
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assert.equal( |
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10, mixedByteStringUcs2.indexOf(Buffer.from('\u03a3', 'ucs2'), 0, 'ucs2')); |
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assert.equal( |
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-1, mixedByteStringUcs2.indexOf(Buffer.from('\u0396', 'ucs2'), 0, 'ucs2')); |
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{ |
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var twoByteString = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'ucs2'); |
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// Test single char pattern |
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assert.equal(0, twoByteString.indexOf('\u039a', 0, 'ucs2')); |
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assert.equal(2, twoByteString.indexOf('\u0391', 0, 'ucs2'), 'Alpha'); |
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assert.equal(4, twoByteString.indexOf('\u03a3', 0, 'ucs2'), 'First Sigma'); |
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assert.equal(6, twoByteString.indexOf('\u03a3', 6, 'ucs2'), 'Second Sigma'); |
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assert.equal(8, twoByteString.indexOf('\u0395', 0, 'ucs2'), 'Epsilon'); |
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assert.equal(-1, twoByteString.indexOf('\u0392', 0, 'ucs2'), 'Not beta'); |
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// Test multi-char pattern |
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assert.equal( |
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0, twoByteString.indexOf('\u039a\u0391', 0, 'ucs2'), 'Lambda Alpha'); |
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assert.equal( |
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2, twoByteString.indexOf('\u0391\u03a3', 0, 'ucs2'), 'Alpha Sigma'); |
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assert.equal( |
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4, twoByteString.indexOf('\u03a3\u03a3', 0, 'ucs2'), 'Sigma Sigma'); |
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assert.equal( |
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6, twoByteString.indexOf('\u03a3\u0395', 0, 'ucs2'), 'Sigma Epsilon'); |
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} |
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var mixedByteStringUtf8 = Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395'); |
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assert.equal(5, mixedByteStringUtf8.indexOf('bc')); |
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assert.equal(5, mixedByteStringUtf8.indexOf('bc', 5)); |
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assert.equal(5, mixedByteStringUtf8.indexOf('bc', -8)); |
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assert.equal(7, mixedByteStringUtf8.indexOf('\u03a3')); |
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assert.equal(-1, mixedByteStringUtf8.indexOf('\u0396')); |
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// Test complex string indexOf algorithms. Only trigger for long strings. |
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// Long string that isn't a simple repeat of a shorter string. |
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var longString = 'A'; |
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for (var i = 66; i < 76; i++) { // from 'B' to 'K' |
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longString = longString + String.fromCharCode(i) + longString; |
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} |
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var longBufferString = Buffer.from(longString); |
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// pattern of 15 chars, repeated every 16 chars in long |
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var pattern = 'ABACABADABACABA'; |
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for (var i = 0; i < longBufferString.length - pattern.length; i += 7) { |
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var index = longBufferString.indexOf(pattern, i); |
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assert.equal((i + 15) & ~0xf, index, 'Long ABACABA...-string at index ' + i); |
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} |
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assert.equal(510, longBufferString.indexOf('AJABACA'), 'Long AJABACA, First J'); |
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assert.equal( |
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1534, longBufferString.indexOf('AJABACA', 511), 'Long AJABACA, Second J'); |
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pattern = 'JABACABADABACABA'; |
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assert.equal( |
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511, longBufferString.indexOf(pattern), 'Long JABACABA..., First J'); |
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assert.equal( |
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1535, longBufferString.indexOf(pattern, 512), 'Long JABACABA..., Second J'); |
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|
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// Search for a non-ASCII string in a pure ASCII string. |
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var asciiString = Buffer.from( |
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'arglebargleglopglyfarglebargleglopglyfarglebargleglopglyf'); |
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assert.equal(-1, asciiString.indexOf('\x2061')); |
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assert.equal(3, asciiString.indexOf('leb', 0)); |
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// Search in string containing many non-ASCII chars. |
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var allCodePoints = []; |
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for (var i = 0; i < 65536; i++) allCodePoints[i] = i; |
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var allCharsString = String.fromCharCode.apply(String, allCodePoints); |
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var allCharsBufferUtf8 = Buffer.from(allCharsString); |
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var allCharsBufferUcs2 = Buffer.from(allCharsString, 'ucs2'); |
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// Search for string long enough to trigger complex search with ASCII pattern |
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// and UC16 subject. |
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assert.equal(-1, allCharsBufferUtf8.indexOf('notfound')); |
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assert.equal(-1, allCharsBufferUcs2.indexOf('notfound')); |
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// Needle is longer than haystack, but only because it's encoded as UTF-16 |
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assert.strictEqual(Buffer.from('aaaa').indexOf('a'.repeat(4), 'ucs2'), -1); |
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assert.strictEqual(Buffer.from('aaaa').indexOf('a'.repeat(4), 'utf8'), 0); |
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assert.strictEqual(Buffer.from('aaaa').indexOf('你好', 'ucs2'), -1); |
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// Haystack has odd length, but the needle is UCS2. |
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// assert.strictEqual(Buffer.from('aaaaa').indexOf('b', 'ucs2'), -1); |
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{ |
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// Find substrings in Utf8. |
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var lengths = [1, 3, 15]; // Single char, simple and complex. |
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var indices = [0x5, 0x60, 0x400, 0x680, 0x7ee, 0xFF02, 0x16610, 0x2f77b]; |
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for (var lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) { |
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for (var i = 0; i < indices.length; i++) { |
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var index = indices[i]; |
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var length = lengths[lengthIndex]; |
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if (index + length > 0x7F) { |
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length = 2 * length; |
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} |
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if (index + length > 0x7FF) { |
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length = 3 * length; |
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} |
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if (index + length > 0xFFFF) { |
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length = 4 * length; |
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} |
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var patternBufferUtf8 = allCharsBufferUtf8.slice(index, index + length); |
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assert.equal(index, allCharsBufferUtf8.indexOf(patternBufferUtf8)); |
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var patternStringUtf8 = patternBufferUtf8.toString(); |
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assert.equal(index, allCharsBufferUtf8.indexOf(patternStringUtf8)); |
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} |
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} |
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} |
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{ |
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// Find substrings in Usc2. |
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var lengths = [2, 4, 16]; // Single char, simple and complex. |
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var indices = [0x5, 0x65, 0x105, 0x205, 0x285, 0x2005, 0x2085, 0xfff0]; |
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for (var lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) { |
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for (var i = 0; i < indices.length; i++) { |
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var index = indices[i] * 2; |
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var length = lengths[lengthIndex]; |
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var patternBufferUcs2 = |
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allCharsBufferUcs2.slice(index, index + length); |
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assert.equal( |
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index, allCharsBufferUcs2.indexOf(patternBufferUcs2, 0, 'ucs2')); |
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var patternStringUcs2 = patternBufferUcs2.toString('ucs2'); |
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assert.equal( |
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index, allCharsBufferUcs2.indexOf(patternStringUcs2, 0, 'ucs2')); |
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} |
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} |
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} |
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assert.throws(function() { |
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b.indexOf(function() { }); |
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}); |
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assert.throws(function() { |
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b.indexOf({}); |
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}); |
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assert.throws(function() { |
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b.indexOf([]); |
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}); |
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// All code for handling encodings is shared between Buffer.indexOf and |
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// Buffer.lastIndexOf, so only testing the separate lastIndexOf semantics. |
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// Test lastIndexOf basic functionality; Buffer b contains 'abcdef'. |
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// lastIndexOf string: |
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assert.equal(b.lastIndexOf('a'), 0); |
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assert.equal(b.lastIndexOf('a', 1), 0); |
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assert.equal(b.lastIndexOf('b', 1), 1); |
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assert.equal(b.lastIndexOf('c', 1), -1); |
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assert.equal(b.lastIndexOf('a', -1), 0); |
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assert.equal(b.lastIndexOf('a', -4), 0); |
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assert.equal(b.lastIndexOf('a', -b.length), 0); |
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assert.equal(b.lastIndexOf('a', -b.length - 1), -1); |
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assert.equal(b.lastIndexOf('a', NaN), 0); |
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assert.equal(b.lastIndexOf('a', -Infinity), -1); |
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assert.equal(b.lastIndexOf('a', Infinity), 0); |
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// lastIndexOf Buffer: |
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assert.equal(b.lastIndexOf(buf_a), 0); |
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assert.equal(b.lastIndexOf(buf_a, 1), 0); |
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assert.equal(b.lastIndexOf(buf_a, -1), 0); |
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assert.equal(b.lastIndexOf(buf_a, -4), 0); |
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assert.equal(b.lastIndexOf(buf_a, -b.length), 0); |
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assert.equal(b.lastIndexOf(buf_a, -b.length - 1), -1); |
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assert.equal(b.lastIndexOf(buf_a, NaN), 0); |
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assert.equal(b.lastIndexOf(buf_a, -Infinity), -1); |
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assert.equal(b.lastIndexOf(buf_a, Infinity), 0); |
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assert.equal(b.lastIndexOf(buf_bc), 1); |
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assert.equal(b.lastIndexOf(buf_bc, 2), 1); |
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assert.equal(b.lastIndexOf(buf_bc, -1), 1); |
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assert.equal(b.lastIndexOf(buf_bc, -3), 1); |
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assert.equal(b.lastIndexOf(buf_bc, -5), 1); |
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assert.equal(b.lastIndexOf(buf_bc, -6), -1); |
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assert.equal(b.lastIndexOf(buf_bc, NaN), 1); |
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assert.equal(b.lastIndexOf(buf_bc, -Infinity), -1); |
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assert.equal(b.lastIndexOf(buf_bc, Infinity), 1); |
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assert.equal(b.lastIndexOf(buf_f), b.length - 1); |
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assert.equal(b.lastIndexOf(buf_z), -1); |
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assert.equal(b.lastIndexOf(buf_empty), -1); |
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assert.equal(b.lastIndexOf(buf_empty, 1), -1); |
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assert.equal(b.lastIndexOf(buf_empty, b.length + 1), -1); |
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assert.equal(b.lastIndexOf(buf_empty, Infinity), -1); |
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// lastIndexOf number: |
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assert.equal(b.lastIndexOf(0x61), 0); |
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assert.equal(b.lastIndexOf(0x61, 1), 0); |
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assert.equal(b.lastIndexOf(0x61, -1), 0); |
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assert.equal(b.lastIndexOf(0x61, -4), 0); |
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assert.equal(b.lastIndexOf(0x61, -b.length), 0); |
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assert.equal(b.lastIndexOf(0x61, -b.length - 1), -1); |
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assert.equal(b.lastIndexOf(0x61, NaN), 0); |
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assert.equal(b.lastIndexOf(0x61, -Infinity), -1); |
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assert.equal(b.lastIndexOf(0x61, Infinity), 0); |
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assert.equal(b.lastIndexOf(0x0), -1); |
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|
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// Test weird offset arguments. |
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// Behaviour should match String.lastIndexOf: |
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assert.equal(b.lastIndexOf('b', 0), -1); |
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assert.equal(b.lastIndexOf('b', undefined), 1); |
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assert.equal(b.lastIndexOf('b', null), -1); |
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assert.equal(b.lastIndexOf('b', {}), 1); |
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assert.equal(b.lastIndexOf('b', []), -1); |
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assert.equal(b.lastIndexOf('b', [2]), 1); |
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|
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// Test needles longer than the haystack. |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'ucs2'), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'utf8'), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'latin1'), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'binary'), -1); |
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assert.strictEqual(b.lastIndexOf(Buffer.from('aaaaaaaaaaaaaaa')), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 2, 'ucs2'), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 3, 'utf8'), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 5, 'latin1'), -1); |
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assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 5, 'binary'), -1); |
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assert.strictEqual(b.lastIndexOf(Buffer.from('aaaaaaaaaaaaaaa'), 7), -1); |
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|
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// 你好 expands to a total of 6 bytes using UTF-8 and 4 bytes using UTF-16 |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 'ucs2'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 'utf8'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 'latin1'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 'binary'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf(Buffer.from('你好')), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 2, 'ucs2'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 3, 'utf8'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 5, 'latin1'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf('你好', 5, 'binary'), -1); |
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assert.strictEqual(buf_bc.lastIndexOf(Buffer.from('你好'), 7), -1); |
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|
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// Test lastIndexOf on a longer buffer: |
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var bufferString = new Buffer('a man a plan a canal panama'); |
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assert.equal(15, bufferString.lastIndexOf('canal')); |
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assert.equal(21, bufferString.lastIndexOf('panama')); |
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assert.equal(0, bufferString.lastIndexOf('a man a plan a canal panama')); |
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assert.equal(-1, bufferString.lastIndexOf('a man a plan a canal mexico')); |
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assert.equal(-1, bufferString.lastIndexOf('a man a plan a canal mexico city')); |
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assert.equal(-1, bufferString.lastIndexOf(Buffer.from('a'.repeat(1000)))); |
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assert.equal(0, bufferString.lastIndexOf('a man a plan', 4)); |
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assert.equal(13, bufferString.lastIndexOf('a ')); |
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assert.equal(13, bufferString.lastIndexOf('a ', 13)); |
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assert.equal(6, bufferString.lastIndexOf('a ', 12)); |
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assert.equal(0, bufferString.lastIndexOf('a ', 5)); |
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assert.equal(13, bufferString.lastIndexOf('a ', -1)); |
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assert.equal(0, bufferString.lastIndexOf('a ', -27)); |
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assert.equal(-1, bufferString.lastIndexOf('a ', -28)); |
|
|
|
// Test lastIndexOf for the case that the first character can be found, |
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// but in a part of the buffer that does not make search to search |
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// due do length constraints. |
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var abInUCS2 = Buffer.from('ab', 'ucs2'); |
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assert.strictEqual(-1, Buffer.from('µaaaa¶bbbb', 'latin1').lastIndexOf('µ')); |
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assert.strictEqual(-1, Buffer.from('µaaaa¶bbbb', 'binary').lastIndexOf('µ')); |
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assert.strictEqual(-1, Buffer.from('bc').lastIndexOf('ab')); |
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assert.strictEqual(-1, Buffer.from('abc').lastIndexOf('qa')); |
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assert.strictEqual(-1, Buffer.from('abcdef').lastIndexOf('qabc')); |
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assert.strictEqual(-1, Buffer.from('bc').lastIndexOf(Buffer.from('ab'))); |
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assert.strictEqual(-1, Buffer.from('bc', 'ucs2').lastIndexOf('ab', 'ucs2')); |
|
assert.strictEqual(-1, Buffer.from('bc', 'ucs2').lastIndexOf(abInUCS2)); |
|
|
|
assert.strictEqual(0, Buffer.from('abc').lastIndexOf('ab')); |
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assert.strictEqual(0, Buffer.from('abc').lastIndexOf('ab', 1)); |
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assert.strictEqual(0, Buffer.from('abc').lastIndexOf('ab', 2)); |
|
assert.strictEqual(0, Buffer.from('abc').lastIndexOf('ab', 3)); |
|
|
|
// The above tests test the LINEAR and SINGLE-CHAR strategies. |
|
// Now, we test the BOYER-MOORE-HORSPOOL strategy. |
|
// Test lastIndexOf on a long buffer w multiple matches: |
|
pattern = 'JABACABADABACABA'; |
|
assert.equal(1535, longBufferString.lastIndexOf(pattern)); |
|
assert.equal(1535, longBufferString.lastIndexOf(pattern, 1535)); |
|
assert.equal(511, longBufferString.lastIndexOf(pattern, 1534)); |
|
|
|
// Finally, give it a really long input to trigger fallback from BMH to |
|
// regular BOYER-MOORE (which has better worst-case complexity). |
|
|
|
// Generate a really long Thue-Morse sequence of 'yolo' and 'swag', |
|
// "yolo swag swag yolo swag yolo yolo swag" ..., goes on for about 5MB. |
|
// This is hard to search because it all looks similar, but never repeats. |
|
|
|
// countBits returns the number of bits in the binary reprsentation of n. |
|
function countBits(n) { |
|
for (var count = 0; n > 0; count++) { |
|
n = n & (n - 1); // remove top bit |
|
} |
|
return count; |
|
} |
|
var parts = []; |
|
for (var i = 0; i < 1000000; i++) { |
|
parts.push((countBits(i) % 2 === 0) ? 'yolo' : 'swag'); |
|
} |
|
var reallyLong = new Buffer(parts.join(' ')); |
|
assert.equal('yolo swag swag yolo', reallyLong.slice(0, 19).toString()); |
|
|
|
// Expensive reverse searches. Stress test lastIndexOf: |
|
pattern = reallyLong.slice(0, 100000); // First 1/50th of the pattern. |
|
assert.equal(4751360, reallyLong.lastIndexOf(pattern)); |
|
assert.equal(3932160, reallyLong.lastIndexOf(pattern, 4000000)); |
|
assert.equal(2949120, reallyLong.lastIndexOf(pattern, 3000000)); |
|
pattern = reallyLong.slice(100000, 200000); // Second 1/50th. |
|
assert.equal(4728480, reallyLong.lastIndexOf(pattern)); |
|
pattern = reallyLong.slice(0, 1000000); // First 1/5th. |
|
assert.equal(3932160, reallyLong.lastIndexOf(pattern)); |
|
pattern = reallyLong.slice(0, 2000000); // first 2/5ths. |
|
assert.equal(0, reallyLong.lastIndexOf(pattern)); |
|
|
|
// test truncation of Number arguments to uint8 |
|
{ |
|
var buf = Buffer.from('this is a test'); |
|
assert.strictEqual(buf.indexOf(0x6973), 3); |
|
assert.strictEqual(buf.indexOf(0x697320), 4); |
|
assert.strictEqual(buf.indexOf(0x69732069), 2); |
|
assert.strictEqual(buf.indexOf(0x697374657374), 0); |
|
assert.strictEqual(buf.indexOf(0x69737374), 0); |
|
assert.strictEqual(buf.indexOf(0x69737465), 11); |
|
assert.strictEqual(buf.indexOf(0x69737465), 11); |
|
assert.strictEqual(buf.indexOf(-140), 0); |
|
assert.strictEqual(buf.indexOf(-152), 1); |
|
assert.strictEqual(buf.indexOf(0xff), -1); |
|
assert.strictEqual(buf.indexOf(0xffff), -1); |
|
} |
|
|
|
|