48 lines
1.6 KiB
JavaScript
48 lines
1.6 KiB
JavaScript
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var table = require('../').table;
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function sheetjs1(utf8) {
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var buf = new Buffer(utf8);
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for(var crc = -1, i = 0; i != buf.length; ++i) {
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crc = (crc >>> 8) ^ table[(crc ^ buf[i]) & 0xFF];
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}
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return crc ^ -1;
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}
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function sheetjs2(utf8) {
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for(var crc = -1, i = 0, L=utf8.length, c, d; i < L;) {
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c = utf8.charCodeAt(i++);
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if(c < 0x80) {
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crc = (crc >>> 8) ^ table[(crc ^ c) & 0xFF];
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} else if(c < 0x800) {
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crc = (crc >>> 8) ^ table[(crc ^ (192|((c>>6)&31))) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ (128|(c&63))) & 0xFF];
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} else if(c >= 0xD800 && c < 0xE000) {
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c = (c&1023)+64; d = utf8.charCodeAt(i++) & 1023;
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crc = (crc >>> 8) ^ table[(crc ^ (240|((c>>8)&7))) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ (128|((c>>2)&63))) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ (128|((d>>6)&15)|(c&3))) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ (128|(d&63))) & 0xFF];
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} else {
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crc = (crc >>> 8) ^ table[(crc ^ (224|((c>>12)&15))) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ (128|((c>>6)&63))) & 0xFF];
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crc = (crc >>> 8) ^ table[(crc ^ (128|(c&63))) & 0xFF];
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}
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}
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return crc ^ -1;
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}
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var BM = require('./bm');
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var suite = new BM('unicode string');
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var foobar = "foo bar baz٪☃🍣";
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foobar += " " + foobar;
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foobar += " " + foobar;
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foobar += " " + foobar;
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foobar += " " + foobar;
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suite.add('sheetjs 1', function() { for(var j = 0; j != 1000; ++j) sheetjs1(foobar); });
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suite.add('sheetjs 2', function() { for(var j = 0; j != 1000; ++j) sheetjs2(foobar); });
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suite.run()
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var assert = require('assert');
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assert.equal(sheetjs1(foobar), sheetjs2(foobar));
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