mcs/class/corlib/System.Security.Cryptography/Base64Constants.cs

   1 //
   2 // System.Security.Cryptography.Base64Constants
   3 //
   4 // Authors:
   5 //      Sergey Chaban (serge@wildwestsoftware.com)
   6 //      Sebastien Pouliot <sebastien@ximian.com>
   7 //
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   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
  30 namespace System.Security.Cryptography {
  31
  32         internal static class Base64Constants {\r
  33                 // Pre-calculated tables\r
  34 \r
  35                 public static readonly byte[] EncodeTable = {
  36                         0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
  37                         0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
  38                         0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,
  39                         0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F
  40                 };\r
  41 \r
  42                 public static readonly byte[] DecodeTable = {
  43                         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  44                         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  45                         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xFF, 0xFF, 0x3F,
  46                         0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  47                         0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
  48                         0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  49                         0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
  50                         0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33
  51                 };\r
  52 \r
  53                 // This code was used to generated the tables\r
  54 /*\r
  55                 // This is the Base64 alphabet as described in RFC 2045 (Table 1, page 25).\r
  56                 private static string ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";\r
  57 \r
  58                 private static byte[] encodeTable;\r
  59                 private static byte[] decodeTable;\r
  60 \r
  61                 static Base64Constants ()\r
  62                 {\r
  63                         int len = ALPHABET.Length;\r
  64 \r
  65                         encodeTable = new byte [len];\r
  66 \r
  67                         for (int i=0; i < len; i++) {\r
  68                                 encodeTable [i] = (byte) ALPHABET [i];\r
  69                         }\r
  70 \r
  71                         decodeTable = new byte [1 + (int)'z'];\r
  72 \r
  73                         for (int i=0; i < decodeTable.Length; i++) {\r
  74                                 decodeTable [i] = Byte.MaxValue;\r
  75                         }\r
  76 \r
  77                         for (int i=0; i < len; i++) {\r
  78                                 char ch = ALPHABET [i];\r
  79                                 decodeTable [(int)ch] = (byte) i;\r
  80                         }\r
  81                 }\r
  82 */
  83         }\r
  84 }\r