Util/EndianConverter.cs

   1 //
   2 // EndianConverter.cs
   3 //
   4 // Authors:
   5 //     Larry Ewing <lewing@novell.com>
   6 //
   7 //
   8 // Copyright (C) 2004 - 2006 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Runtime.InteropServices;
  32
  33 namespace Beagle.Util {
  34         public class EndianConverter {
  35                 public static uint Swap (uint val, bool little)
  36                 {
  37                         return (little != System.BitConverter.IsLittleEndian) ?
  38                                 ((uint) ((((uint) (val) & (uint) 0x000000ffU) << 24) |
  39                                          (((uint) (val) & (uint) 0x0000ff00U) <<  8) |
  40                                          (((uint) (val) & (uint) 0x00ff0000U) >>  8) |
  41                                          (((uint) (val) & (uint) 0xff000000U) >> 24)))
  42                                 : val;
  43                 }
  44
  45                 public static ushort Swap (ushort val, bool little)
  46                 {
  47                         return (little != System.BitConverter.IsLittleEndian) ?
  48                                 ((ushort) ((ushort)(val >> 8) | (ushort)(val << 8)))
  49                                 : val;
  50                 }
  51
  52                 public static ushort Swap (ushort val)
  53                 {
  54                         return ((ushort) ((ushort)(val >> 8) | (ushort)(val << 8)));
  55                 }
  56
  57                 public static ulong Swap (ulong val, bool little)
  58                 {
  59                         return (little != System.BitConverter.IsLittleEndian) ?
  60                         ((ulong) ((((ulong) (val) & (ulong) 0x00000000000000ffU) << 56) |
  61                                   (((ulong) (val) & (ulong) 0x000000000000ff00U) << 40) |
  62                                   (((ulong) (val) & (ulong) 0x0000000000ff0000U) << 24) |
  63                                   (((ulong) (val) & (ulong) 0x00000000ff000000U) <<  8) |
  64                                   (((ulong) (val) & (ulong) 0x000000ff00000000U) >>  8) |
  65                                   (((ulong) (val) & (ulong) 0x0000ff0000000000U) >> 24) |
  66                                   (((ulong) (val) & (ulong) 0x00ff000000000000U) >> 40) |
  67                                   (((ulong) (val) & (ulong) 0xff00000000000000U) >> 56)))
  68                                 : val;
  69                 }
  70
  71                 public static byte [] GetBytes (uint val, bool little)
  72                 {
  73                         val = Swap (val, little);
  74                         return System.BitConverter.GetBytes (val);
  75                 }
  76
  77                 public static byte [] GetBytes (ushort val, bool little)
  78                 {
  79                         val = Swap (val, little);
  80                         return System.BitConverter.GetBytes (val);
  81                 }
  82
  83                 public static byte [] GetBytes (ulong val, bool little)
  84                 {
  85                         val = Swap (val, little);
  86                         return System.BitConverter.GetBytes (val);
  87                 }
  88
  89                 public static ushort ToUInt16 (byte [] data, int position, bool little)
  90                 {
  91                         ushort val = System.BitConverter.ToUInt16 (data, position);
  92                         return Swap (val, little);
  93                 }
  94
  95                 public static uint ToUInt32 (byte [] data, int position, bool little)
  96                 {
  97                         uint val = System.BitConverter.ToUInt32 (data, position);
  98                         return Swap (val, little);
  99                 }
 100
 101                 public static float ToSingle (byte [] data, int position, bool little)
 102                 {
 103                         float retval;
 104                         unsafe {
 105                                 uint * ptr;
 106                                 ptr = (uint *)&retval;
 107                                 *ptr = ToUInt32 (data, position, little);
 108                         }
 109                         return retval;
 110                 }
 111
 112                 public static int ToInt32 (byte [] data, int position, bool little)
 113                 {
 114                         return unchecked ((int) ToUInt32 (data, position, little));
 115                 }
 116
 117                 public static ulong ToUInt64 (byte [] data, int position, bool little)
 118                 {
 119                         ulong val = System.BitConverter.ToUInt64(data, position);
 120                         return Swap (val, little);
 121                 }
 122         }
 123 }
 124