function base64_encode(a){var b="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";var c,o2,o3,h1,h2,h3,h4,bits,i=0,ac=0,enc="",tmp_arr=[];if(!a){return a}a=this.utf8_encode(a+'');do{c=a.charCodeAt(i++);o2=a.charCodeAt(i++);o3=a.charCodeAt(i++);bits=c<<16|o2<<8|o3;h1=bits>>18&0x3f;h2=bits>>12&0x3f;h3=bits>>6&0x3f;h4=bits&0x3f;tmp_arr[ac++]=b.charAt(h1)+b.charAt(h2)+b.charAt(h3)+b.charAt(h4)}while(i<a.length);enc=tmp_arr.join('');switch(a.length%3){case 1:enc=enc.slice(0,-2)+'==';break;case 2:enc=enc.slice(0,-1)+'=';break}return enc}function base64_decode(a){var b="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";var c,o2,o3,h1,h2,h3,h4,bits,i=0,ac=0,dec="",tmp_arr=[];if(!a){return a}a+='';do{h1=b.indexOf(a.charAt(i++));h2=b.indexOf(a.charAt(i++));h3=b.indexOf(a.charAt(i++));h4=b.indexOf(a.charAt(i++));bits=h1<<18|h2<<12|h3<<6|h4;c=bits>>16&0xff;o2=bits>>8&0xff;o3=bits&0xff;if(h3==64){tmp_arr[ac++]=String.fromCharCode(c)}else if(h4==64){tmp_arr[ac++]=String.fromCharCode(c,o2)}else{tmp_arr[ac++]=String.fromCharCode(c,o2,o3)}}while(i<a.length);dec=tmp_arr.join('');dec=this.utf8_decode(dec);return dec}function utf8_encode(a){var b=(a+'');var c="";var d,end;var e=0;d=end=0;e=b.length;for(var n=0;n<e;n++){var f=b.charCodeAt(n);var g=null;if(f<128){end++}else if(f>127&&f<2048){g=String.fromCharCode((f>>6)|192)+String.fromCharCode((f&63)|128)}else{g=String.fromCharCode((f>>12)|224)+String.fromCharCode(((f>>6)&63)|128)+String.fromCharCode((f&63)|128)}if(g!==null){if(end>d){c+=b.substring(d,end)}c+=g;d=end=n+1}}if(end>d){c+=b.substring(d,b.length)}return c}function utf8_decode(a){var b=[],i=0,ac=0,c1=0,c2=0,c3=0;a+='';while(i<a.length){c1=a.charCodeAt(i);if(c1<128){b[ac++]=String.fromCharCode(c1);i++}else if((c1>191)&&(c1<224)){c2=a.charCodeAt(i+1);b[ac++]=String.fromCharCode(((c1&31)<<6)|(c2&63));i+=2}else{c2=a.charCodeAt(i+1);c3=a.charCodeAt(i+2);b[ac++]=String.fromCharCode(((c1&15)<<12)|((c2&63)<<6)|(c3&63));i+=3}}return b.join('')}