2 // System.Web.Mail.MailUtil.cs
5 // Per Arneng <pt99par@student.bth.se>
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:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
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23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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32 namespace System.Web.Mail {
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 {
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 ) {
45 foreach( char chr in str ) {
49 if( ! ( (ch > 61) && (ch < 127) || (ch>31) && (ch<61) ) ) {
58 // Encodes a string to base4
59 public static string Base64Encode( string str ) {
60 return Convert.ToBase64String( Encoding.Default.GetBytes( str ) );
63 // Generate a unique boundary
64 public static string GenerateBoundary() {
65 StringBuilder boundary = new StringBuilder("__MONO__Boundary");
67 boundary.Append("__");
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);
78 boundary.Append("__");
79 boundary.Append((new Random()).Next());
80 boundary.Append("__");
82 return boundary.ToString();