js-adler32/perf/utf8.js

64 lines
1.8 KiB
JavaScript

var old = require('adler-32').str;
var cur = require('../').str;
function sheetjs1(utf8) {
var buf = new Buffer(utf8);
var a = 1, b = 0, L = buf.length, M;
for(var i = 0; i < L;) {
M = Math.min(L-i, 3854);
for(;M>0;--M) {
a += buf[i++];
b += a;
}
a %= 65521;
b %= 65521;
}
return (b << 16) | a;
}
function sheetjs2(utf8) {
var a = 1, b = 0, L = utf8.length, M, c, d;
for(var i = 0; i < L;) {
M = Math.min(L-i, 3850);
while(M>0) {
c = utf8.charCodeAt(i++);
if(c < 0x80) {
a += c; b += a; --M;
} else if(c < 0x800) {
a += 192|((c>>6)&31); b += a; --M;
a += 128|(c&63); b += a; --M;
} else if(c >= 0xD800 && c < 0xE000) {
c = (c&1023)+64; d = utf8.charCodeAt(i++) & 1023;
a += 240|((c>>8)&7); b += a; --M;
a += 128|((c>>2)&63); b += a; --M;
a += 128|((d>>6)&15)|((c&3)<<4); b += a; --M;
a += 128|(d&63); b += a; --M;
} else {
a += 224|((c>>12)&15); b += a; --M;
a += 128|((c>>6)&63); b += a; --M;
a += 128|(c&63); b += a; --M;
}
}
a %= 65521;
b %= 65521;
}
return (b << 16) | a;
}
var foobar = "foo bar baz٪☃🍣";
for(var i = 0; i != 11; ++i) foobar += " " + foobar;
var assert = require('assert');
var res = old(foobar);
assert.equal(res, cur(foobar));
assert.equal(res, sheetjs1(foobar));
assert.equal(res, sheetjs2(foobar));
var BM = require('./bm');
var suite = new BM('unicode string');
suite.add('sheetjs 1', function() { for(var j = 0; j != 1000; ++j) sheetjs1(foobar); });
suite.add('sheetjs 2', function() { for(var j = 0; j != 1000; ++j) sheetjs2(foobar); });
suite.add('last vers', function() { for(var j = 0; j != 1000; ++j) old(foobar); });
suite.add('current v', function() { for(var j = 0; j != 1000; ++j) cur(foobar); });
suite.run();