mono/tests/field-layout.cs

   1 using System;
   2 using System.Runtime.InteropServices;
   3
   4 namespace Test {
   5         [StructLayout ( LayoutKind.Explicit )]
   6         public struct Doh {
   7                 [ FieldOffset(0) ] public int a;
   8                 [ FieldOffset(0) ] public byte a1;
   9                 [ FieldOffset(1) ] public byte a2;
  10                 [ FieldOffset(2) ] public byte a3;
  11                 [ FieldOffset(3) ] public byte a4;
  12         }
  13         [StructLayout ( LayoutKind.Explicit )]
  14         public class Doh2 {
  15                 [ FieldOffset(0) ] public int a;
  16                 [ FieldOffset(0) ] public byte a1;
  17                 [ FieldOffset(1) ] public byte a2;
  18                 [ FieldOffset(2) ] public byte a3;
  19                 [ FieldOffset(3) ] public byte a4;
  20         }
  21         [StructLayout ( LayoutKind.Explicit )]
  22         public class Doh3: Doh2 {
  23                 [ FieldOffset(0) ] public int b;
  24         }
  25         public class Test {
  26                 public static int Main() {
  27                         Doh doh;
  28                         Doh3 doh2 = new Doh3 ();
  29                         bool success = false;
  30                         // shut up the compiler
  31                         doh.a1 = doh.a2 = doh.a3 = doh.a4 = 0;
  32                         doh.a = 1;
  33                         if (doh.a1 == 1 && doh.a2 == 0 && doh.a3 == 0 && doh.a4 == 0) {
  34                                 System.Console.WriteLine ("Little endian");
  35                                 success = true;
  36                         } else if (doh.a1 == 0 && doh.a2 == 0 && doh.a3 == 0 && doh.a4 == 1) {
  37                                 System.Console.WriteLine ("Big endian");
  38                                 success = true;
  39                         }
  40                         if (!success)
  41                                 return 1;
  42                         // shut up the compiler
  43                         doh2.a1 = doh2.a2 = doh2.a3 = doh2.a4 = 0;
  44                         doh2.a = 1;
  45                         if (doh2.a1 == 1 && doh2.a2 == 0 && doh2.a3 == 0 && doh2.a4 == 0) {
  46                                 success = true;
  47                         } else if (doh2.a1 == 0 && doh2.a2 == 0 && doh2.a3 == 0 && doh2.a4 == 1) {
  48                                 success = true;
  49                         }
  50                         doh2.b = 3;
  51                         if (doh2.a != 3)
  52                                 success = false;
  53                         if (!success)
  54                                 return 1;
  55                         return 0;
  56
  57                 }
  58         }
  59 }