[Modify] Polish it

websocket-sharp/Ext.cs

@@ -825,34 +825,45 @@ namespace WebSocketSharp
       var seps = new string (separators);
 
       var buff = new StringBuilder (32);
+      var end = len - 1;
       var escaped = false;
       var quoted = false;
 
-      for (var i = 0; i < len; i++) {
+      for (var i = 0; i <= end; i++) {
         var c = value[i];
+        buff.Append (c);
+
         if (c == '"') {
-          if (escaped)
-            escaped = !escaped;
-          else
+          if (escaped) {
+            escaped = false;
+            continue;
+          }
+
           quoted = !quoted;
+          continue;
         }
-        else if (c == '\\') {
-          if (i < len - 1 && value[i + 1] == '"')
+
+        if (c == '\\') {
+          if (i == end)
+            break;
+
+          if (value[i + 1] == '"')
             escaped = true;
+
+          continue;
         }
-        else if (seps.Contains (c)) {
-          if (!quoted) {
+
+        if (seps.Contains (c)) {
+          if (quoted)
+            continue;
+
+          buff.Length -= 1;
           yield return buff.ToString ();
 
           buff.Length = 0;
           continue;
         }
       }
-        else {
-        }
-
-        buff.Append (c);
-      }
 
       yield return buff.ToString ();
     }