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

   1 //\r
   2 // System.Security.Cryptography CryptoStream.cs\r
   3 //\r
   4 // Author:\r
   5 //   Thomas Neidhart (tome@sbox.tugraz.at)\r
   6 //\r
   7 \r
   8 using System;\r
   9 using System.IO;\r
  10 \r
  11 namespace System.Security.Cryptography\r
  12 {\r
  13 \r
  14         public class CryptoStream : Stream\r
  15         {\r
  16                 private CryptoStreamMode _mode;\r
  17                 \r
  18                 public CryptoStream(Stream stream, ICryptoTransform transform, CryptoStreamMode mode) \r
  19                 {\r
  20                         _mode = mode;\r
  21                 }\r
  22                 \r
  23                 public override bool CanRead\r
  24                 {\r
  25                         get {\r
  26                                 switch (_mode) {\r
  27                                         case CryptoStreamMode.Read:\r
  28                                                 return true;\r
  29                                         \r
  30                                         case CryptoStreamMode.Write:\r
  31                                                 return false;\r
  32                                         \r
  33                                         default:\r
  34                                                 return false;\r
  35                                 }\r
  36                         }\r
  37                 }\r
  38 \r
  39                 public override bool CanSeek\r
  40                 {\r
  41                         get {\r
  42                                 return false;\r
  43                         }\r
  44                 }\r
  45 \r
  46                 public override bool CanWrite\r
  47                 {\r
  48                         get {\r
  49                                 switch (_mode) {\r
  50                                         case CryptoStreamMode.Read:\r
  51                                                 return false;\r
  52                                         \r
  53                                         case CryptoStreamMode.Write:\r
  54                                                 return true;\r
  55                                         \r
  56                                         default:\r
  57                                                 return false;\r
  58                                 }\r
  59                         }\r
  60                 }\r
  61                 \r
  62                 public override long Length\r
  63                 {\r
  64                         get {\r
  65                                 throw new NotSupportedException("Length property not supported by CryptoStream");\r
  66                         }\r
  67                 }\r
  68 \r
  69                 public override long Position\r
  70                 {\r
  71                         get {\r
  72                                 throw new NotSupportedException("Position property not supported by CryptoStream");\r
  73                         }\r
  74                         set {\r
  75                                 throw new NotSupportedException("Position property not supported by CryptoStream");\r
  76                         }\r
  77                 }\r
  78 \r
  79                 [MonoTODO]\r
  80                 public override int Read(byte[] buffer, int offset, int count)\r
  81                 {\r
  82                         // TODO: implement\r
  83                         return 0;\r
  84                 }\r
  85 \r
  86                 [MonoTODO]\r
  87                 public override void Write(byte[] buffer, int offset, int count)\r
  88                 {\r
  89                         // TODO: implement\r
  90                 }\r
  91 \r
  92                 [MonoTODO]\r
  93                 public override void Flush()\r
  94                 {\r
  95                         // TODO: implement\r
  96                 }\r
  97 \r
  98                 [MonoTODO]\r
  99                 public void FlushFinalBlock()\r
 100                 {\r
 101                         if (_mode != CryptoStreamMode.Write)\r
 102                                 throw new NotSupportedException("cannot flush a non-writeable CryptoStream");\r
 103                         \r
 104                         // TODO: implement\r
 105                 }\r
 106 \r
 107                 public override long Seek(long offset, SeekOrigin origin)\r
 108                 {\r
 109                         throw new NotSupportedException("cannot seek a CryptoStream");\r
 110                 }\r
 111                 \r
 112                 public override void SetLength(long value)\r
 113                 {\r
 114                         // LAMESPEC: should throw NotSupportedException like Seek??\r
 115                         return;\r
 116                 }\r
 117                 \r
 118         } // CryptoStream\r
 119         \r
 120 } // System.Security.Cryptography\r