mono/metadata/mono-endian.c

   1 /*
   2  * mono-endian.c:
   3  *
   4  * Author:
   5  *      Mono Project (http://www.mono-project.com)
   6  *
   7  * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
   8  * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
   9  */
  10 #include <config.h>
  11 #include "mono-endian.h"
  12
  13 #if NO_UNALIGNED_ACCESS
  14
  15 typedef union {
  16         char c [2];
  17         guint16 i;
  18 } mono_rint16;
  19
  20 typedef union {
  21         char c [4];
  22         guint32 i;
  23 } mono_rint32;
  24
  25 typedef union {
  26         char c [8];
  27         guint64 i;
  28 } mono_rint64;
  29
  30 guint16
  31 mono_read16 (const unsigned char *x)
  32 {
  33         mono_rint16 r;
  34 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  35         r.c [0] = x [0];
  36         r.c [1] = x [1];
  37 #else
  38         r.c [1] = x [0];
  39         r.c [0] = x [1];
  40 #endif
  41         return r.i;
  42 }
  43
  44 guint32
  45 mono_read32 (const unsigned char *x)
  46 {
  47         mono_rint32 r;
  48 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  49         r.c [0] = x [0];
  50         r.c [1] = x [1];
  51         r.c [2] = x [2];
  52         r.c [3] = x [3];
  53 #else
  54         r.c [3] = x [0];
  55         r.c [2] = x [1];
  56         r.c [1] = x [2];
  57         r.c [0] = x [3];
  58 #endif
  59         return r.i;
  60 }
  61
  62 guint64
  63 mono_read64 (const unsigned char *x)
  64 {
  65         mono_rint64 r;
  66 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  67         r.c [0] = x [0];
  68         r.c [1] = x [1];
  69         r.c [2] = x [2];
  70         r.c [3] = x [3];
  71         r.c [4] = x [4];
  72         r.c [5] = x [5];
  73         r.c [6] = x [6];
  74         r.c [7] = x [7];
  75 #else
  76         r.c [7] = x [0];
  77         r.c [6] = x [1];
  78         r.c [5] = x [2];
  79         r.c [4] = x [3];
  80         r.c [3] = x [4];
  81         r.c [2] = x [5];
  82         r.c [1] = x [6];
  83         r.c [0] = x [7];
  84 #endif
  85         return r.i;
  86 }
  87
  88 #endif