Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/Odbc/OdbcConnectionString.cs

@@ -0,0 +1,65 @@
+//------------------------------------------------------------------------------
+// <copyright file="OdbcConnectionString.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Data.Odbc {
+
+    using System;
+    using System.Collections;
+    using System.Data;
+    using System.Data.Common;
+    using System.Security;
+    using System.Security.Permissions;
+    using System.Text;
+
+    internal sealed class OdbcConnectionString : DbConnectionOptions {
+        // instances of this class are intended to be immutable, i.e readonly
+        // used by pooling classes so it is much easier to verify correctness
+        // when not worried about the class being modified during execution
+
+        private static class KEY {
+            internal const string SaveFile                  = "savefile";
+        }
+
+        private readonly string _expandedConnectionString;        
+
+        internal OdbcConnectionString(string connectionString, bool validate) : base(connectionString, null, true) {            
+            if (!validate) {
+                string filename = null;
+                int position = 0;
+                _expandedConnectionString = ExpandDataDirectories(ref filename, ref position);
+            }
+            if (validate || (null == _expandedConnectionString)) {
+                // do not check string length if it was expanded because the final result may be shorter than the original
+                if ((null != connectionString) && (ODBC32.MAX_CONNECTION_STRING_LENGTH < connectionString.Length)) { // MDAC 83536
+                    throw ODBC.ConnectionStringTooLong();
+                }
+            }
+        }
+
+        protected internal override System.Security.PermissionSet CreatePermissionSet() {
+            System.Security.PermissionSet permissionSet;
+            if (ContainsKey(KEY.SaveFile)) {
+                permissionSet = new NamedPermissionSet("FullTrust");
+            }
+            else {
+                permissionSet = new System.Security.PermissionSet(System.Security.Permissions.PermissionState.None);
+                permissionSet.AddPermission(new OdbcPermission(this));
+            }
+            return permissionSet;
+        }
+
+        protected internal override string Expand() {
+            if (null != _expandedConnectionString) {
+                return _expandedConnectionString;
+            }
+            else {
+                return base.Expand();
+            }
+        }
+    }
+}