mcs/class/corlib/System.Text/ASCIIEncoding.cs

   1 //
   2 // System.Text.ASCIIEncoding.cs
   3 //
   4 // Author:
   5 //   Sean MacIsaac (macisaac@ximian.com)
   6 //   Dietmar Maurer (dietmar@ximian.com)
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11
  12 namespace System.Text {
  13
  14         public class ASCIIEncoding : Encoding
  15         {
  16                 public ASCIIEncoding () : base ()
  17                 {
  18                         encoding_name = "US-ASCII";
  19                         body_name = "us-ascii";
  20                         header_name = "us-ascii";
  21                         web_name = "us-ascii";
  22                         is_browser_display = false;
  23                         is_browser_save = false;
  24                         is_mail_news_display = true;
  25                         is_mail_news_save = true;
  26                 }
  27
  28                 public override int GetByteCount (string chars)
  29                 {
  30                         if (chars == null)
  31                                 throw new ArgumentNullException ();
  32
  33                         return chars.Length;
  34                 }
  35
  36                 public override int GetByteCount (char[] chars)
  37                 {
  38                         if (chars == null)
  39                                 throw new ArgumentNullException ();
  40
  41                         return chars.Length;
  42                 }
  43
  44                 public override int GetByteCount (char[] chars, int index, int count)
  45                 {
  46                         if (chars == null)
  47                                 throw new ArgumentNullException ();
  48
  49                         if ((index < 0) || (count <= 0) || ((index + count) >= chars.Length))
  50                                 throw new ArgumentOutOfRangeException ();
  51
  52                         return count;
  53                 }
  54
  55                 public override int GetBytes (char[] chars, int charIndex, int charCount,
  56                                               byte[] bytes, int byteIndex)
  57                 {
  58                         if ((bytes == null) || (chars == null))
  59                                 throw new ArgumentNullException ();
  60
  61                         if ((byteIndex < 0) || (charIndex < 0) || (charCount < 0) ||
  62                             ((charIndex + charCount) > chars.Length) ||
  63                             (byteIndex >= bytes.Length))
  64                                 throw new ArgumentOutOfRangeException ();
  65
  66                         if ((bytes.Length - byteIndex) < charCount)
  67                                 throw new ArgumentException ();
  68
  69                         for (int i = 0; i < charCount; i++)
  70                                 if (chars[charIndex+i] > 0x7f)
  71                                         bytes[byteIndex+i] = (byte) '?';
  72                                 else
  73                                         bytes[byteIndex+i] = (byte) chars[charIndex+i];
  74
  75                         return charCount;
  76                 }
  77
  78                 public override int GetBytes (string chars, int charIndex, int charCount,
  79                                               byte[] bytes, int byteIndex)
  80                 {
  81                         return GetBytes (chars.ToCharArray (), charIndex, charCount,
  82                                          bytes, byteIndex);
  83                 }
  84
  85                 public override int GetCharCount (byte[] bytes)
  86                 {
  87                         if (bytes == null)
  88                                 throw new ArgumentNullException ();
  89
  90                         return bytes.Length;
  91                 }
  92
  93                 public override int GetCharCount (byte[] bytes, int index, int count)
  94                 {
  95                         if (bytes == null)
  96                                 throw new ArgumentNullException ();
  97
  98                         if ((index < 0) || (count <= 0) || ((index + count) >= bytes.Length))
  99                                 throw new ArgumentOutOfRangeException ();
 100
 101                         return count;
 102                 }
 103
 104                 public override int GetChars (byte[] bytes, int byteIndex, int byteCount,
 105                                               char[] chars, int charIndex)
 106                 {
 107                         if ((bytes == null) || (chars == null))
 108                                 throw new ArgumentNullException ();
 109
 110                         if ((byteIndex < 0) || (charIndex < 0) || (byteCount < 0) ||
 111                             ((byteIndex + byteCount) > bytes.Length) ||
 112                             (charIndex >= chars.Length))
 113                                 throw new ArgumentOutOfRangeException ();
 114
 115                         if ((chars.Length - charIndex) < byteCount)
 116                                 throw new ArgumentException ();
 117
 118                         for (int i = 0; i < byteCount; i++)
 119                                 if (bytes[byteIndex+i] > 0x7f)
 120                                         chars[charIndex+i] = '?';
 121                                 else
 122                                         chars[charIndex+i] = (char) bytes[byteIndex+i];
 123
 124                         return byteCount;
 125                 }
 126
 127                 public override int GetMaxByteCount (int charCount)
 128                 {
 129                         if (charCount < 0)
 130                                 throw new ArgumentOutOfRangeException ();
 131
 132                         return charCount;
 133                 }
 134
 135                 public override int GetMaxCharCount (int byteCount)
 136                 {
 137                         if (byteCount < 0)
 138                                 throw new ArgumentOutOfRangeException ();
 139
 140                         return byteCount;
 141                 }
 142
 143                 public override string GetString (byte[] bytes)
 144                 {
 145                         if (bytes == null)
 146                                 throw new ArgumentNullException ();
 147
 148                         return new String (GetChars (bytes, 0, bytes.Length));
 149                 }
 150
 151                 public override string GetString (byte[] bytes, int byteIndex, int byteCount)
 152                 {
 153                         if (bytes == null)
 154                                 throw new ArgumentNullException ();
 155
 156                         if ((byteIndex < 0) || (byteCount <= 0) ||
 157                             ((byteIndex + byteCount) >= bytes.Length))
 158                                 throw new ArgumentOutOfRangeException ();
 159
 160                         return new String (GetChars (bytes, byteIndex, byteCount));
 161                 }
 162
 163         }
 164 }
 165