Song.Site/Templates/Web/Gov/CoreScripts/Base64.js

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/**
 *create by 2012-08-25 pm 17:48
 *@author hexinglun@gmail.com
 *BASE64 Encode and Decode By UTF-8 unicode
 *可以和java的BASE64编码和解码互相转化
 */
(function(){
	var BASE64_MAPPING = [
		'A','B','C','D','E','F','G','H',
		'I','J','K','L','M','N','O','P',
		'Q','R','S','T','U','V','W','X',
		'Y','Z','a','b','c','d','e','f',
		'g','h','i','j','k','l','m','n',
		'o','p','q','r','s','t','u','v',
		'w','x','y','z','0','1','2','3',
		'4','5','6','7','8','9','+','/'
	];

	/**
	 *ascii convert to binary
	 */
	var _toBinary = function(ascii){
		var binary = new Array();
		while(ascii > 0){
			var b = ascii%2;
			ascii = Math.floor(ascii/2);
			binary.push(b);
		}
		/*
		var len = binary.length;
		if(6-len > 0){
			for(var i = 6-len ; i > 0 ; --i){
				binary.push(0);
			}
		}*/
		binary.reverse();
		return binary;
	};

	/**
	 *binary convert to decimal
	 */
	var _toDecimal  = function(binary){
		var dec = 0;
		var p = 0;
		for(var i = binary.length-1 ; i >= 0 ; --i){
			var b = binary[i];
			if(b == 1){
				dec += Math.pow(2 , p);
			}
			++p;
		}
		return dec;
	};

	/**
	 *unicode convert to utf-8
	 */
	var _toUTF8Binary = function(c , binaryArray){
		var mustLen = (8-(c+1)) + ((c-1)*6);