From e8a21e1120509bf1dcfedc88e82af5e136b98ce4 Mon Sep 17 00:00:00 2001
From: Constantin Michael <constantin@codesynthesis.com>
Date: Thu, 26 May 2011 18:54:54 +0200
Subject: Correct endian-traits

---
 odb/pgsql/endian-traits.hxx | 169 ++++++++++++++++++++++++++------------------
 1 file changed, 99 insertions(+), 70 deletions(-)

(limited to 'odb/pgsql/endian-traits.hxx')

diff --git a/odb/pgsql/endian-traits.hxx b/odb/pgsql/endian-traits.hxx
index 07dc023..2dc79f3 100644
--- a/odb/pgsql/endian-traits.hxx
+++ b/odb/pgsql/endian-traits.hxx
@@ -6,103 +6,132 @@
 #ifndef ODB_PGSQL_ENDIAN_TRAITS_HXX
 #define ODB_PGSQL_ENDIAN_TRAITS_HXX
 
+#include <cstddef> // std::size_t
 #include <algorithm> // std::reverse
 
 namespace odb
 {
   namespace pgsql
   {
-    template <typename T, int S = sizeof (T)>
-    struct swap_endian;
-
-    template <typename T>
-    struct swap_endian<T, 2>
+    namespace details
     {
-      static T
-      swap (T x)
+      template <typename T, std::size_t S = sizeof (T)>
+      struct swap_endian;
+
+      template <typename T>
+      struct swap_endian<T, 2>
       {
-        union u2
+        static T
+        swap (T x)
         {
-          T t;
-          char c[2];
-        };
+          union u2
+          {
+            T t;
+            char c[2];
+          };
 
-        u2 u;
-        u.t = x;
-        std::reverse (u.c, u.c + 2);
+          u2 u;
+          u.t = x;
 
-        return u.t;
-      }
-    };
+          char tmp (u.c[0]);
+          u.c[0] = u.c[1];
+          u.c[1] = tmp;
 
-    template <typename T>
-    struct swap_endian<T, 4>
-    {
-      static T
-      swap (T x)
+          return u.t;
+        }
+      };
+
+      template <typename T>
+      struct swap_endian<T, 4>
       {
-        union u4
+        static T
+        swap (T x)
         {
-          T t;
-          char c[4];
-        };
+          union u4
+          {
+            T t;
+            char c[4];
+          };
 
-        u4 u;
-        u.t = x;
-        std::reverse (u.c, u.c + 4);
+          u4 u;
+          u.t = x;
 
-        return u.t;
-      }
-    };
+          char tmp (u.c[0]);
+          u.c[0] = u.c[3];
+          u.c[3] = tmp;
 
-    template <typename T>
-    struct swap_endian<T, 8>
-    {
-      static T
-      swap (T x)
+          tmp = u.c[1];
+          u.c[1] = u.c[2];
+          u.c[2] = tmp;
+
+          return u.t;
+        }
+      };
+
+      template <typename T>
+      struct swap_endian<T, 8>
       {
-        union u8
+        static T
+        swap (T x)
         {
-          T t;
-          char c[8];
-        };
+          union u8
+          {
+            T t;
+            char c[8];
+          };
 
-        u8 u;
-        u.t = x;
-        std::reverse (u.c, u.c + 8);
+          u8 u;
+          u.t = x;
 
-        return u.t;
-      }
-    };
+          char tmp (u.c[0]);
+          u.c[0] = u.c[7];
+          u.c[7] = tmp;
 
-    class endian_traits
-    {
-    public:
-      enum endian
-      {
-        big_endian,
-        little_endian
-      };
+          tmp = u.c[1];
+          u.c[1] = u.c[6];
+          u.c[6] = tmp;
 
-    public:
-      static const endian host_endian;
+          tmp = u.c[2];
+          u.c[2] = u.c[5];
+          u.c[5] = tmp;
 
-    public:
+          tmp = u.c[3];
+          u.c[3] = u.c[4];
+          u.c[4] = tmp;
 
-      template <typename T>
-      static T
-      hton (T x)
-      {
-        return host_endian == big_endian ? x : swap_endian<T>::swap (x);
-      }
+          return u.t;
+        }
+      };
 
-      template <typename T>
-      static T
-      ntoh (T x)
+      class endian_traits
       {
-        return host_endian == big_endian ? x : swap_endian<T>::swap (x);
-      }
-    };
+      public:
+        enum endian
+        {
+          big,
+          little
+        };
+
+      public:
+        static const endian host_endian;
+
+      public:
+
+        template <typename T>
+        static T
+        hton (T x)
+        {
+          return host_endian == big ? x : swap_endian<T>::swap (x);
+        }
+
+        template <typename T>
+        static T
+        ntoh (T x)
+        {
+          return host_endian == big ? x : swap_endian<T>::swap (x);
+        }
+      };
+    }
   }
 }
 
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