87 lines
2.2 KiB
JavaScript
87 lines
2.2 KiB
JavaScript
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var t=[], poly = 0xEDB88320;
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function node_crc32() {
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var c, n, k;
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for (n = 0; n < 256; n += 1) {
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c = n;
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for (k = 0; k < 8; k += 1) {
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if (c & 1) {
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c = poly ^ (c >>> 1);
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} else {
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c = c >>> 1;
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}
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}
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t[n] = c >>> 0;
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}
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}
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function node_pako() {
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var c, table = [];
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for(var n =0; n < 256; n++){
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c = n;
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for(var k =0; k < 8; k++){
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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}
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table[n] = c;
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}
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return table;
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}
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function sheetjs1() {
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var c, table = [];
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for(var n =0; n != 256; ++n){
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c = n;
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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table[n] = c;
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}
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return table;
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}
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function sheetjs2() {
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var c, table = new Array(256);
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for(var n =0; n != 256; ++n){
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c = n;
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
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table[n] = c;
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}
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return table;
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}
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var BM = require('./bm');
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var suite = new BM('building crc32 table');
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suite.add('npm crc32', function() { for(var j = 0; j != 1000; ++j) node_crc32(); });
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suite.add('npm pako', function() { for(var j = 0; j != 1000; ++j) node_pako(); });
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suite.add('sheetjs 1', function() { for(var j = 0; j != 1000; ++j) sheetjs1(); });
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suite.add('sheetjs 2', function() { for(var j = 0; j != 1000; ++j) sheetjs2(); });
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suite.run()
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var assert = require('assert');
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var m1 = (node_pako());
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var m2 = (sheetjs1());
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var m3 = (sheetjs2());
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assert.equal(m1.length, m2.length);
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assert.equal(m1.length, m3.length);
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for(var i = 0; i != m1.length; ++i) { assert.equal(m1[i], m2[i]); assert.equal(m1[i], m3[i]); }
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