122 lines
3.8 KiB
JavaScript
122 lines
3.8 KiB
JavaScript
var table = require('../').table;
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var old = require('crc-32').bstr;
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var cur = require('../').bstr;
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function strToArr(str) {
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// sweet hack to turn string into a 'byte' array
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return Array.prototype.map.call(str, function (c) {
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return c.charCodeAt(0);
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});
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}
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function crcTable(arr, append) {
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var crc, i, l;
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// if we're in append mode, don't reset crc
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// if arr is null or undefined, reset table and return
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if (typeof crcTable.crc === 'undefined' || !append || !arr) {
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crcTable.crc = 0 ^ -1;
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if (!arr) {
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return;
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}
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}
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// store in temp variable for minor speed gain
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crc = crcTable.crc;
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for (i = 0, l = arr.length; i < l; i += 1) {
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crc = (crc >>> 8) ^ table[(crc ^ arr[i]) & 0xff];
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}
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crcTable.crc = crc;
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return crc ^ -1;
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}
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function node_crc32(bstr) {
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return crcTable(strToArr(bstr));
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}
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function sheetjsB(bstr) {
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var b = new Buffer(bstr, 'binary');
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for(var crc = -1, i = 0; i < b.length; ++i) {
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crc = (crc >>> 8) ^ table[(crc ^ b[i]) & 0xFF];
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}
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return crc ^ -1;
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}
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function sheetjs1(bstr) {
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for(var crc = -1, i = 0; i < bstr.length; ++i) {
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i)) & 0xFF];
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}
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return crc ^ -1;
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}
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function sheetjs2(bstr) {
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var L = bstr.length - 1;
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for(var crc = -1, i = 0; i < L;) {
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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}
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if(i === bstr.length - 1) crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i)) & 0xFF];
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return crc ^ -1;
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}
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function sheetjs3(bstr) {
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for(var crc = -1, i = 0, L=bstr.length-2; i < L;) {
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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}
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while(i < L+2) crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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return crc ^ -1;
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}
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function sheetjs8(bstr) {
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for(var crc = -1, i = 0, L=bstr.length-7; i < L;) {
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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}
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while(i < L+7) crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i++)) & 0xFF];
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return crc ^ -1;
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}
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var w = 80000;
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var b = new Array(w);
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b[0] = "";
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for(var i = 1; i !== w; ++i) b[i] = b[i-1] + String.fromCharCode((Math.random()*256)&255);
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var assert = require('assert');
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function check(foobar) {
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var baseline = old(foobar);
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assert.equal(baseline, sheetjs1(foobar));
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assert.equal(baseline, sheetjs2(foobar));
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assert.equal(baseline, sheetjs3(foobar));
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assert.equal(baseline, sheetjs8(foobar));
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assert.equal(baseline, sheetjsB(foobar));
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assert.equal(baseline, cur(foobar));
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if(i < 100) assert.equal(baseline, node_crc32(foobar));
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}
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for(var i = 0; i !== w; ++i) {
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var foobar = b[i];
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}
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var BM = require('./bm');
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var suite = new BM('binary string');
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suite.add('sheetjs 1', function() { for(var j = 0; j !== w; j+=100) sheetjs1(b[j]); });
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suite.add('sheetjs 2', function() { for(var j = 0; j !== w; j+=100) sheetjs2(b[j]); });
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suite.add('sheetjs 3', function() { for(var j = 0; j !== w; j+=100) sheetjs3(b[j]); });
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suite.add('sheetjs 8', function() { for(var j = 0; j !== w; j+=100) sheetjs8(b[j]); });
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suite.add('sheetjs B', function() { for(var j = 0; j !== w; j+=100) sheetjsB(b[j]); });
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suite.add('last vers', function() { for(var j = 0; j !== w; j+=100) old(b[j]); });
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suite.add('current v', function() { for(var j = 0; j !== w; j+=100) cur(b[j]); });
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suite.run();
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