From c7c22e3db1c826bcfb2bc66651ec480aae0d4ae0 Mon Sep 17 00:00:00 2001
From: yo mama <pepper@scannerjammer.com>
Date: Sat, 4 Apr 2015 01:00:59 -0700
Subject: first

---
 view/poc/util/base64-binary.js | 53 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 view/poc/util/base64-binary.js

(limited to 'view/poc/util/base64-binary.js')

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;	
+	}
+}
-- 
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