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         [Serializable]
  15         public class ASCIIEncoding : Encoding
  16         {
  17                 public ASCIIEncoding () : base ()
  18                 {
  19                         encoding_name = "US-ASCII";
  20                         body_name = "us-ascii";
  21                         header_name = "us-ascii";
  22                         web_name = "us-ascii";
  23                         is_browser_display = false;
  24                         is_browser_save = false;
  25                         is_mail_news_display = true;
  26                         is_mail_news_save = true;
  27                 }
  28
  29                 public override int GetByteCount (string chars)
  30                 {
  31                         if (chars == null)
  32                                 throw new ArgumentNullException ();
  33
  34                         return chars.Length;
  35                 }
  36
  37                 public override int GetByteCount (char[] chars)
  38                 {
  39                         if (chars == null)
  40                                 throw new ArgumentNullException ();
  41
  42                         return chars.Length;
  43                 }
  44
  45                 public override int GetByteCount (char[] chars, int index, int count)
  46                 {
  47                         if (chars == null)
  48                                 throw new ArgumentNullException ();
  49
  50                         if ((index < 0) || (count <= 0) || ((index + count) > chars.Length))
  51                                 throw new ArgumentOutOfRangeException ();
  52
  53                         return count;
  54                 }
  55
  56                 public override int GetBytes (char[] chars, int charIndex, int charCount,
  57                                               byte[] bytes, int byteIndex)
  58                 {
  59                         if ((bytes == null) || (chars == null))
  60                                 throw new ArgumentNullException ();
  61
  62                         if ((byteIndex < 0) || (charIndex < 0) || (charCount < 0) ||
  63                             ((charIndex + charCount) > chars.Length) ||
  64                             (byteIndex >= bytes.Length))
  65                                 throw new ArgumentOutOfRangeException ();
  66
  67                         if ((bytes.Length - byteIndex) < charCount)
  68                                 throw new ArgumentException ();
  69
  70                         for (int i = 0; i < charCount; i++)
  71                                 if (chars[charIndex+i] > 0x7f)
  72                                         bytes[byteIndex+i] = (byte) '?';
  73                                 else
  74                                         bytes[byteIndex+i] = (byte) chars[charIndex+i];
  75
  76                         return charCount;
  77                 }
  78
  79                 public override int GetBytes (string chars, int charIndex, int charCount,
  80                                               byte[] bytes, int byteIndex)
  81                 {
  82                         return GetBytes (chars.ToCharArray (), charIndex, charCount,
  83                                          bytes, byteIndex);
  84                 }
  85
  86                 public override int GetCharCount (byte[] bytes)
  87                 {
  88                         if (bytes == null)
  89                                 throw new ArgumentNullException ();
  90
  91                         return bytes.Length;
  92                 }
  93
  94                 public override int GetCharCount (byte[] bytes, int index, int count)
  95                 {
  96                         if (bytes == null)
  97                                 throw new ArgumentNullException ();
  98
  99                         if ((index < 0) || (count <= 0) || ((index + count) > bytes.Length))
 100                                 throw new ArgumentOutOfRangeException ();
 101
 102                         return count;
 103                 }
 104
 105                 public override int GetChars (byte[] bytes, int byteIndex, int byteCount,
 106                                               char[] chars, int charIndex)
 107                 {
 108                         if ((bytes == null) || (chars == null))
 109                                 throw new ArgumentNullException ();
 110
 111                         if ((byteIndex < 0) || (charIndex < 0) || (byteCount < 0) ||
 112                             ((byteIndex + byteCount) > bytes.Length) ||
 113                             (charIndex + byteCount > chars.Length))
 114                                 throw new ArgumentOutOfRangeException ();
 115
 116                         if ((chars.Length - charIndex) < byteCount)
 117                                 throw new ArgumentException ();
 118
 119                         for (int i = 0; i < byteCount; i++)
 120                                 if (bytes[byteIndex+i] > 0x7f)
 121                                         chars[charIndex+i] = '?';
 122                                 else
 123                                         chars[charIndex+i] = (char) bytes[byteIndex+i];
 124
 125                         return byteCount;
 126                 }
 127
 128                 public override int GetMaxByteCount (int charCount)
 129                 {
 130                         if (charCount < 0)
 131                                 throw new ArgumentOutOfRangeException ();
 132
 133                         return charCount;
 134                 }
 135
 136                 public override int GetMaxCharCount (int byteCount)
 137                 {
 138                         if (byteCount < 0)
 139                                 throw new ArgumentOutOfRangeException ();
 140
 141                         return byteCount;
 142                 }
 143
 144                 public override string GetString (byte[] bytes)
 145                 {
 146                         if (bytes == null)
 147                                 throw new ArgumentNullException ();
 148
 149                         return new String (GetChars (bytes, 0, bytes.Length));
 150                 }
 151
 152                 public override string GetString (byte[] bytes, int byteIndex, int byteCount)
 153                 {
 154                         if (bytes == null)
 155                                 throw new ArgumentNullException ();
 156
 157                         if ((byteIndex < 0) || (byteCount < 0) ||
 158                             ((byteIndex + byteCount) > bytes.Length))
 159                                 throw new ArgumentOutOfRangeException ();
 160
 161                         return new String (GetChars (bytes, byteIndex, byteCount));
 162                 }
 163
 164         }
 165 }
 166