138 lines
4.8 KiB
JavaScript
138 lines
4.8 KiB
JavaScript
cc.Class({
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extends: cc.Component,
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properties: {
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// foo: {
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// default: null, // The default value will be used only when the component attaching
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// to a node for the first time
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// url: cc.Texture2D, // optional, default is typeof default
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// serializable: true, // optional, default is true
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// visible: true, // optional, default is true
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// displayName: 'Foo', // optional
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// readonly: false, // optional, default is false
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// },
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// ...
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},
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statics:{
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decode : function(_base64Str){
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var BASE64_MAPPING = [
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'A','B','C','D','E','F','G','H',
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'I','J','K','L','M','N','O','P',
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'Q','R','S','T','U','V','W','X',
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'Y','Z','a','b','c','d','e','f',
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'g','h','i','j','k','l','m','n',
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'o','p','q','r','s','t','u','v',
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'w','x','y','z','0','1','2','3',
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'4','5','6','7','8','9','+','/'
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];
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var _len = _base64Str.length;
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var extra_Zero_Count = 0;
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/**
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*计算在进行BASE64编码的时候，补了几个0
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*/
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if(_base64Str.charAt(_len-1) == '='){
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//alert(_base64Str.charAt(_len-1));
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//alert(_base64Str.charAt(_len-2));
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if(_base64Str.charAt(_len-2) == '='){//两个等号说明补了4个0
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extra_Zero_Count = 4;
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_base64Str = _base64Str.substring(0 , _len-2);
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}else{//一个等号说明补了2个0
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extra_Zero_Count = 2;
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_base64Str = _base64Str.substring(0 , _len - 1);
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}
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}
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var binaryArray = [];
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for(var i = 0 , len = _base64Str.length; i < len ; ++i){
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var c = _base64Str.charAt(i);
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for(var j = 0 , size = BASE64_MAPPING.length ; j < size ; ++j){
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if(c == BASE64_MAPPING[j]){
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var _tmp = this._toBinary(j);
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/*不足6位的补0*/
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var _tmpLen = _tmp.length;
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if(6-_tmpLen > 0){
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for(var k = 6-_tmpLen ; k > 0 ; --k){
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_tmp.unshift(0);
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}
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}
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binaryArray = binaryArray.concat(_tmp);
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break;
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}
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}
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}
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if(extra_Zero_Count > 0){
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binaryArray = binaryArray.slice(0 , binaryArray.length - extra_Zero_Count);
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}
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var unicode = [];
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var unicodeBinary = [];
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for(var i = 0 , len = binaryArray.length ; i < len ; ){
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if(binaryArray[i] == 0){
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unicode=unicode.concat(this._toDecimal(binaryArray.slice(i,i+8)));
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i += 8;
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}else{
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var sum = 0;
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while(i < len){
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if(binaryArray[i] == 1){
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++sum;
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}else{
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break;
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}
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++i;
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}
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unicodeBinary = unicodeBinary.concat(binaryArray.slice(i+1 , i+8-sum));
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i += 8 - sum;
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while(sum > 1){
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unicodeBinary = unicodeBinary.concat(binaryArray.slice(i+2 , i+8));
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i += 8;
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--sum;
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}
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unicode = unicode.concat(this._toDecimal(unicodeBinary));
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unicodeBinary = [];
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}
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}
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return unicode;
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},
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_toBinary : function(ascii){
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var binary = new Array();
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while(ascii > 0){
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var b = ascii%2;
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ascii = Math.floor(ascii/2);
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binary.push(b);
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}
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/*
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var len = binary.length;
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if(6-len > 0){
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for(var i = 6-len ; i > 0 ; --i){
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binary.push(0);
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}
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}*/
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binary.reverse();
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return binary;
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},
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_toDecimal : function(binary){
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var dec = 0;
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var p = 0;
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for(var i = binary.length-1 ; i >= 0 ; --i){
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var b = binary[i];
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if(b == 1){
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dec += Math.pow(2 , p);
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}
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++p;
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}
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return dec;
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}
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},
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// use this for initialization
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onLoad: function () {
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},
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// called every frame, uncomment this function to activate update callback
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// update: function (dt) {
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// },
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});
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