diff options
Diffstat (limited to 'view/poc/util')
| -rw-r--r-- | view/poc/util/base64-binary.js | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/view/poc/util/base64-binary.js b/view/poc/util/base64-binary.js new file mode 100644 index 0000000..84b084f --- /dev/null +++ b/view/poc/util/base64-binary.js @@ -0,0 +1,53 @@ +var Base64Binary = {
+ _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
+
+ /* will return a Uint8Array type */
+ decodeArrayBuffer: function(input) {
+ var bytes = (input.length/4) * 3;
+ var ab = new ArrayBuffer(bytes);
+ this.decode(input, ab);
+
+ return ab;
+ },
+
+ decode: function(input, arrayBuffer) {
+ //get last chars to see if are valid
+ var lkey1 = this._keyStr.indexOf(input.charAt(input.length-1));
+ var lkey2 = this._keyStr.indexOf(input.charAt(input.length-2));
+
+ var bytes = (input.length/4) * 3;
+ if (lkey1 == 64) bytes--; //padding chars, so skip
+ if (lkey2 == 64) bytes--; //padding chars, so skip
+
+ 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) {
+ //get the 3 octects in 4 ascii chars
+ 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;
+ }
+}
|