Add Blob Shiv for Android Cordova compatibility

WebContent/zip.js

@@ -27,7 +27,38 @@
  */
 
 (function(obj) {
-
+
+    // Blob Shiv for Android Cordova compatibility
+    obj.Blob = (function() {
+        var nativeBlob = Blob;
+
+        // Add unprefixed slice() method.
+        if (Blob.prototype.webkitSlice) {
+            Blob.prototype.slice = Blob.prototype.webkitSlice;
+        } else if (Blob.prototype.mozSlice) {
+            Blob.prototype.slice = Blob.prototype.mozSlice;
+        }
+
+        // Temporarily replace Blob() constructor with one that checks support.
+        return function(parts, properties) {
+            try {
+                // Restore native Blob() constructor, so this check is only evaluated once.
+                Blob = nativeBlob;
+                return new Blob(parts || [], properties || {});
+            } catch (e) {
+                // If construction fails provide one that uses BlobBuilder.
+                Blob = function(parts, properties) {
+                    var bb = new(WebKitBlobBuilder || MozBlobBuilder),
+                        i;
+                    for (i in parts) {
+                        bb.append(parts[i]);
+                    }
+                    return bb.getBlob(properties && properties.type ? properties.type : undefined);
+                };
+            }
+        };
+    }());
+
 	var ERR_BAD_FORMAT = "File format is not recognized.";
 	var ERR_ENCRYPTED = "File contains encrypted entry.";
 	var ERR_ZIP64 = "File is using Zip64 (4gb+ file size).";