Initial move from old twain-in-dotnet.

NTwain/Extensions.cs

@@ -0,0 +1,55 @@
+// The MIT License (MIT)
+// Copyright (c) 2013 Yin-Chun Wang
+//
+// Permission is hereby granted, free of charge, to any person obtaining a 
+// copy of this software and associated documentation files (the "Software"), 
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the 
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included 
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF 
+// OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Security;
+using System.Security.Permissions;
+using System.Text;
+using System.Windows.Media.Imaging;
+using NTwain.Properties;
+using NTwain.Values;
+using Microsoft.Win32.SafeHandles;
+
+namespace NTwain
+{
+	/// <summary>
+	/// Some utility stuff.
+	/// </summary>
+    public static class Extensions
+    {
+        /// <summary>
+        /// Verifies the string length is under the maximum length
+        /// and throws <see cref="ArgumentException"/> if violated.
+        /// </summary>
+        /// <param name="value">The value.</param>
+        /// <param name="maxLength">The maximum length.</param>
+        internal static void VerifyLengthUnder(this string value, int maxLength)
+        {
+            if (value != null && value.Length > maxLength)
+                throw new ArgumentException(Resources.MaxStringLengthExceeded);
+        }
+
+    }
+}