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jsfiddle crc32 in javascript

by dledle2

HTML

jsfiddle crc32 in javascript<br>

https://github.com/SheetJS/js-crc32/blob/master/crc32.js

JavaScript

/* jsfiddle crc32 in javascript

https://github.com/SheetJS/js-crc32/blob/master/crc32.js

*/

/* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
var CRC32;
(function (factory) {
	if(typeof DO_NOT_EXPORT_CRC === 'undefined') {
		if('object' === typeof exports) {
			factory(exports);
		} else if ('function' === typeof define && define.amd) {
			define(function () {
				var module = {};
				factory(module);
				return module;
			});
		} else {
			factory(CRC32 = {});
		}
	} else {
		factory(CRC32 = {});
	}
}(function(CRC32) {
CRC32.version = '0.4.0';
/* see perf/crc32table.js */
function signed_crc_table() {
	var c = 0, table = new Array(256);

	for(var n =0; n != 256; ++n){
		c = n;
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
		table[n] = c;
	}

	return typeof Int32Array !== 'undefined' ? new Int32Array(table) : table;
}

var table = signed_crc_table();
/* charCodeAt is the best approach for binary strings */
var use_buffer = typeof Buffer !== 'undefined';
function crc32_bstr(bstr) {
	if(bstr.length > 32768) if(use_buffer) return crc32_buf_8(new Buffer(bstr));
	var crc = -1, L = bstr.length - 1;
	for(var i = 0; i < L;) {
		crc =  table[(crc ^ bstr.charCodeAt(i++)) & 0xFF] ^ (crc >>> 8);
		crc =  table[(crc ^ bstr.charCodeAt(i++)) & 0xFF] ^ (crc >>> 8);
	}
	if(i === L) crc = (crc >>> 8) ^ table[(crc ^ bstr.charCodeAt(i)) & 0xFF];
	return crc ^ -1;
}

function crc32_buf(buf) {
	if(buf.length > 10000) return crc32_buf_8(buf);
	for(var crc = -1, i = 0, L=buf.length-3; i < L;) {
		crc = (crc >>> 8) ^ table[(crc^buf[i++])&0xFF];
		crc = (crc >>> 8) ^...