reader: files_reader evolved with multiple format support (epub and cbr/cbz for now), session (position and preferences) store/restore and more

reader/js/lib/blob.js

@@ -0,0 +1,31 @@
+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);
+      };
+    }        
+  };
+}());