mcs/class/System.Web/System.Web.Mail/MailUtil.cs

   1 //
   2 // System.Web.Mail.MailUtil.cs
   3 //
   4 // Author(s):
   5 //   Per Arneng <pt99par@student.bth.se>
   6 //
   7 //
   8
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29 using System;
  30 using System.Text;
  31
  32 namespace System.Web.Mail {
  33
  34     // This class contains some utillity functions
  35     // that doesnt fit in other classes and to keep
  36     // high cohesion on the other classes.
  37     internal class MailUtil {
  38
  39         // determines if a string needs to
  40         // be encoded for transfering over
  41         // the smtp protocol without risking
  42         // that it would be changed.
  43         public static bool NeedEncoding( string str ) {
  44
  45             foreach( char chr in str ) {
  46
  47                 int ch = (int)chr;
  48
  49                 if( ! ( (ch > 61) && (ch < 127) || (ch>31) && (ch<61) ) ) {
  50
  51                     return true;
  52                 }
  53             }
  54
  55             return false;
  56         }
  57
  58         // Encodes a string to base4
  59         public static string Base64Encode( string str ) {
  60             return Convert.ToBase64String( Encoding.Default.GetBytes( str ) );
  61         }
  62
  63         // Generate a unique boundary
  64         public static string GenerateBoundary() {
  65             StringBuilder  boundary = new StringBuilder("__MONO__Boundary");
  66
  67             boundary.Append("__");
  68
  69             DateTime now = DateTime.Now;
  70             boundary.Append(now.Year);
  71             boundary.Append(now.Month);
  72             boundary.Append(now.Day);
  73             boundary.Append(now.Hour);
  74             boundary.Append(now.Minute);
  75             boundary.Append(now.Second);
  76             boundary.Append(now.Millisecond);
  77
  78             boundary.Append("__");
  79             boundary.Append((new Random()).Next());
  80             boundary.Append("__");
  81
  82             return boundary.ToString();
  83         }
  84
  85     }
  86
  87
  88 }