Import lwIP contrib rep

... from http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git/ into contrib/ subdir, STABLE-2_1_0_RELEASE tag
lwIP contrib is now officially frozen
TODO: Fix build

contrib/apps/LwipMibCompiler/SharpSnmpLib/Mib/Elements/ImportsFrom.cs

@@ -0,0 +1,60 @@
+/*
+ * Created by SharpDevelop.
+ * User: lextm
+ * Date: 2008/5/31
+ * Time: 12:07
+ * 
+ * To change this template use Tools | Options | Coding | Edit Standard Headers.
+ */
+
+using System.Collections.Generic;
+
+namespace Lextm.SharpSnmpLib.Mib.Elements
+{
+    public sealed class ImportsFrom
+    {
+        private readonly string _module;
+        private readonly List<string> _types = new List<string>();
+
+        public ImportsFrom(Symbol last, ISymbolEnumerator symbols)
+        {
+            Symbol previous = last;
+            Symbol current;
+            while ((current = symbols.NextSymbol()) != Symbol.From)
+            {
+                if (current == Symbol.EOL) 
+                {
+                    continue;
+                }
+                
+                if (current == Symbol.Comma)
+                {
+                    previous.AssertIsValidIdentifier();
+                    _types.Add(previous.ToString());
+                }
+                
+                previous = current;
+            }
+
+            previous.AssertIsValidIdentifier();
+            _types.Add(previous.ToString());
+
+            _module = symbols.NextSymbol().ToString().ToUpperInvariant(); // module names are uppercase
+        }
+        
+        public string Module
+        {
+            get { return _module; }
+        }
+
+        public IList<string> Types
+        {
+            get { return _types; }
+        }
+
+        public override string ToString()
+        {
+            return string.Join(", ", _types.ToArray()) + " FROM " + _module;
+        }
+    }
+}