mcs/class/System.Drawing/System.Drawing.Imaging/MetaHeader.cs

   1 //
   2 // System.Drawing.Imaging.MetaHeader.cs
   3 //
   4 // Authors:
   5 //   Everaldo Canuto (everaldo.canuto@bol.com.br)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //   Dennis Hayes (dennish@raytek.com)
   8 //   Sebastien Pouliot  <sebastien@ximian.com>
   9 //
  10 // (C) 2002 Ximian, Inc.  http://www.ximian.com
  11 // Copyright (C) 2004, 2006-2007 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Runtime.InteropServices;
  34
  35 namespace System.Drawing.Imaging {
  36
  37         [StructLayout (LayoutKind.Sequential, Pack=2)]
  38         internal struct WmfMetaHeader {
  39                 // field order match: http://wvware.sourceforge.net/caolan/ora-wmf.html
  40                 // for WMFHEAD structure
  41                 public short file_type;
  42                 public short header_size;
  43                 public short version;
  44                 // this is unaligned and fails on the SPARC architecture (see bug #81254 for details)
  45                 // public int file_size;
  46                 public ushort file_size_low;
  47                 public ushort file_size_high;
  48                 public short num_of_objects;
  49                 public int max_record_size;
  50                 public short num_of_params;
  51         }
  52
  53         [StructLayout (LayoutKind.Sequential)]
  54         public sealed class MetaHeader {
  55
  56                 private WmfMetaHeader wmf;
  57
  58                 public MetaHeader ()
  59                 {
  60                 }
  61
  62                 internal MetaHeader (WmfMetaHeader header)
  63                 {
  64                         wmf.file_type = header.file_type;
  65                         wmf.header_size = header.header_size;
  66                         wmf.version = header.version;
  67                         wmf.file_size_low = header.file_size_low;
  68                         wmf.file_size_high = header.file_size_high;
  69                         wmf.num_of_objects = header.num_of_objects;
  70                         wmf.max_record_size = header.max_record_size;
  71                         wmf.num_of_params = header.num_of_params;
  72                 }
  73
  74
  75                 public short HeaderSize {
  76                         get { return wmf.header_size; }
  77                         set { wmf.header_size = value; }
  78                 }
  79
  80                 public int MaxRecord {
  81                         get { return wmf.max_record_size; }
  82                         set { wmf.max_record_size = value; }
  83                 }
  84
  85                 public short NoObjects {
  86                         get { return wmf.num_of_objects; }
  87                         set { wmf.num_of_objects = value; }
  88                 }
  89
  90                 public short NoParameters {
  91                         get { return wmf.num_of_params; }
  92                         set { wmf.num_of_params = value; }
  93                 }
  94
  95                 public int Size {
  96                         get {
  97                                 if (BitConverter.IsLittleEndian)
  98                                         return (wmf.file_size_high << 16) | wmf.file_size_low;
  99                                 else
 100                                         return (wmf.file_size_low << 16) | wmf.file_size_high;
 101                         }
 102                         set {
 103                                 if (BitConverter.IsLittleEndian) {
 104                                         wmf.file_size_high = (ushort)(value >> 16);
 105                                         wmf.file_size_low = (ushort)value;
 106                                 } else {
 107                                         wmf.file_size_high = (ushort)value;
 108                                         wmf.file_size_low = (ushort)(value >> 16);
 109                                 }
 110                         }
 111                 }
 112
 113                 public short Type {
 114                         get { return wmf.file_type; }
 115                         set { wmf.file_type = value; }
 116                 }
 117
 118                 public short Version {
 119                         get { return wmf.version; }
 120                         set { wmf.version = value; }
 121                 }
 122         }
 123 }