mcs/class/System.Net.Http/System.Net.Http.Headers/ContentRangeHeaderValue.cs

   1 //
   2 // ContentRangeHeaderValue.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2012 Xamarin Inc (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.Collections.Generic;
  30 using System.Text;
  31 using System.Globalization;
  32
  33 namespace System.Net.Http.Headers
  34 {
  35         public class ContentRangeHeaderValue : ICloneable
  36         {
  37                 string unit = "bytes";
  38
  39                 private ContentRangeHeaderValue ()
  40                 {
  41                 }
  42
  43                 public ContentRangeHeaderValue (long length)
  44                 {
  45                         if (length < 0)
  46                                 throw new ArgumentOutOfRangeException ("length");
  47
  48                         this.Length = length;
  49                 }
  50
  51                 public ContentRangeHeaderValue (long from, long to)
  52                 {
  53                         if (from < 0 || from > to)
  54                                 throw new ArgumentOutOfRangeException ("from");
  55
  56                         this.From = from;
  57                         this.To = to;
  58                 }
  59
  60                 public ContentRangeHeaderValue (long from, long to, long length)
  61                         : this (from, to)
  62                 {
  63                         if (length < 0)
  64                                 throw new ArgumentOutOfRangeException ("length");
  65
  66                         if (to > length)
  67                                 throw new ArgumentOutOfRangeException ("to");
  68
  69                         this.Length = length;
  70                 }
  71
  72                 public long? From { get; private set; }
  73
  74                 public bool HasLength {
  75                         get {
  76                                 return Length != null;
  77                         }
  78                 }
  79
  80                 public bool HasRange {
  81                         get {
  82                                 return From != null;
  83                         }
  84                 }
  85
  86                 public long? Length { get; private set; }
  87                 public long? To { get; private set; }
  88
  89                 public string Unit {
  90                         get {
  91                                 return unit;
  92                         }
  93                         set {
  94                                 if (value == null)
  95                                         throw new ArgumentNullException ("Unit");
  96
  97                                 Parser.Token.Check (value);
  98
  99                                 unit = value;
 100                         }
 101                 }
 102
 103                 object ICloneable.Clone ()
 104                 {
 105                         return MemberwiseClone ();
 106                 }
 107
 108                 public override bool Equals (object obj)
 109                 {
 110                         var source = obj as ContentRangeHeaderValue;
 111                         if (source == null)
 112                                 return false;
 113
 114                         return source.Length == Length && source.From == From && source.To == To &&
 115                                 string.Equals (source.unit, unit, StringComparison.OrdinalIgnoreCase);
 116                 }
 117
 118                 public override int GetHashCode ()
 119                 {
 120                         return Unit.GetHashCode () ^ Length.GetHashCode () ^
 121                                 From.GetHashCode () ^ To.GetHashCode () ^
 122                                 unit.ToLowerInvariant ().GetHashCode ();
 123                 }
 124
 125                 public static ContentRangeHeaderValue Parse (string input)
 126                 {
 127                         ContentRangeHeaderValue value;
 128                         if (TryParse (input, out value))
 129                                 return value;
 130
 131                         throw new FormatException (input);
 132                 }
 133
 134                 public static bool TryParse (string input, out ContentRangeHeaderValue parsedValue)
 135                 {
 136                         parsedValue = null;
 137
 138                         var lexer = new Lexer (input);
 139                         var t = lexer.Scan ();
 140                         if (t != Token.Type.Token)
 141                                 return false;
 142
 143                         var value = new ContentRangeHeaderValue ();
 144                         value.unit = lexer.GetStringValue (t);
 145
 146                         t = lexer.Scan ();
 147                         if (t != Token.Type.Token)
 148                                 return false;
 149
 150                         int nvalue;
 151                         if (!lexer.IsStarStringValue (t)) {
 152                                 if (!lexer.TryGetNumericValue (t, out nvalue)) {
 153                                         var s = lexer.GetStringValue (t);
 154                                         if (s.Length < 3)
 155                                                 return false;
 156
 157                                         var sep = s.Split ('-');
 158                                         if (sep.Length != 2)
 159                                                 return false;
 160
 161                                         if (!int.TryParse (sep[0], NumberStyles.None, CultureInfo.InvariantCulture, out nvalue))
 162                                                 return false;
 163
 164                                         value.From = nvalue;
 165
 166                                         if (!int.TryParse (sep[1], NumberStyles.None, CultureInfo.InvariantCulture, out nvalue))
 167                                                 return false;
 168
 169                                         value.To = nvalue;
 170                                 } else {
 171                                         value.From = nvalue;
 172
 173                                         t = lexer.Scan (recognizeDash: true);
 174                                         if (t != Token.Type.SeparatorDash)
 175                                                 return false;
 176
 177                                         t = lexer.Scan ();
 178
 179                                         if (!lexer.TryGetNumericValue (t, out nvalue))
 180                                                 return false;
 181
 182                                         value.To = nvalue;
 183                                 }
 184                         }
 185
 186                         t = lexer.Scan ();
 187
 188                         if (t != Token.Type.SeparatorSlash)
 189                                 return false;
 190
 191                         t = lexer.Scan ();
 192
 193                         if (!lexer.IsStarStringValue (t)) {
 194                                 long lvalue;
 195                                 if (!lexer.TryGetNumericValue (t, out lvalue))
 196                                         return false;
 197
 198                                 value.Length = lvalue;
 199                         }
 200
 201                         t = lexer.Scan ();
 202
 203                         if (t != Token.Type.End)
 204                                 return false;
 205
 206                         parsedValue = value;
 207
 208                         return true;
 209                 }
 210
 211                 public override string ToString ()
 212                 {
 213                         var sb = new StringBuilder (unit);
 214                         sb.Append (" ");
 215                         if (From == null) {
 216                                 sb.Append ("*");
 217                         } else {
 218                                 sb.Append (From.Value.ToString (CultureInfo.InvariantCulture));
 219                                 sb.Append ("-");
 220                                 sb.Append (To.Value.ToString (CultureInfo.InvariantCulture));
 221                         }
 222
 223                         sb.Append ("/");
 224                         sb.Append (Length == null ? "*" :
 225                                 Length.Value.ToString (CultureInfo.InvariantCulture));
 226
 227                         return sb.ToString ();
 228                 }
 229         }
 230 }