123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081 |
- var Base64Binary = {
- _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
-
- decodeArrayBuffer: function(input) {
- var bytes = Math.ceil( (3*input.length) / 4.0);
- var ab = new ArrayBuffer(bytes);
- this.decode(input, ab);
- return ab;
- },
- decode: function(input, arrayBuffer) {
-
- var lkey1 = this._keyStr.indexOf(input.charAt(input.length-1));
- var lkey2 = this._keyStr.indexOf(input.charAt(input.length-1));
- var bytes = Math.ceil( (3*input.length) / 4.0);
- if (lkey1 == 64) bytes--;
- if (lkey2 == 64) bytes--;
- var uarray;
- var chr1, chr2, chr3;
- var enc1, enc2, enc3, enc4;
- var i = 0;
- var j = 0;
- if (arrayBuffer)
- uarray = new Uint8Array(arrayBuffer);
- else
- uarray = new Uint8Array(bytes);
- input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
- for (i=0; i<bytes; i+=3) {
-
- enc1 = this._keyStr.indexOf(input.charAt(j++));
- enc2 = this._keyStr.indexOf(input.charAt(j++));
- enc3 = this._keyStr.indexOf(input.charAt(j++));
- enc4 = this._keyStr.indexOf(input.charAt(j++));
- chr1 = (enc1 << 2) | (enc2 >> 4);
- chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
- chr3 = ((enc3 & 3) << 6) | enc4;
- uarray[i] = chr1;
- if (enc3 != 64) uarray[i+1] = chr2;
- if (enc4 != 64) uarray[i+2] = chr3;
- }
- return uarray;
- }
- };
|