Move endian-traits to odb/pgsql/details folder

2 files changed, 170 insertions, 0 deletions

diff --git a/odb/pgsql/details/endian-traits.cxx b/odb/pgsql/details/endian-traits.cxx
new file mode 100644
index 0000000..ee53e49
--- /dev/null
+++ b/odb/pgsql/details/endian-traits.cxx
@@ -0,0 +1,32 @@
+// file      : odb/pgsql/details/endian-traits.cxx
+// author    : Constantin Michael <constantin@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/pgsql/details/endian-traits.hxx>
+
+namespace odb
+{
+  namespace pgsql
+  {
+    namespace details
+    {
+      namespace
+      {
+        endian_traits::endian
+        infer_host_endian ()
+        {
+          short s (1);
+          char* c (reinterpret_cast<char*> (&s));
+
+          return *c == 0 ?
+            endian_traits::big :
+            endian_traits::little;
+        }
+      }
+
+      const endian_traits::endian endian_traits::host_endian (
+        infer_host_endian ());
+    }
+  }
+}
diff --git a/odb/pgsql/details/endian-traits.hxx b/odb/pgsql/details/endian-traits.hxx
new file mode 100644
index 0000000..c9b6cff
--- /dev/null
+++ b/odb/pgsql/details/endian-traits.hxx
@@ -0,0 +1,138 @@
+// file      : odb/pgsql/details/endian-traits.hxx
+// author    : Constantin Michael <constantin@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_PGSQL_DETAILS_ENDIAN_TRAITS_HXX
+#define ODB_PGSQL_DETAILS_ENDIAN_TRAITS_HXX
+
+#include <cstddef> // std::size_t
+#include <algorithm> // std::reverse
+
+namespace odb
+{
+  namespace pgsql
+  {
+    namespace details
+    {
+      template <typename T, std::size_t S = sizeof (T)>
+      struct swap_endian;
+
+      template <typename T>
+      struct swap_endian<T, 2>
+      {
+        static T
+        swap (T x)
+        {
+          union u2
+          {
+            T t;
+            char c[2];
+          };
+
+          u2 u;
+          u.t = x;
+
+          char tmp (u.c[0]);
+          u.c[0] = u.c[1];
+          u.c[1] = tmp;
+
+          return u.t;
+        }
+      };
+
+      template <typename T>
+      struct swap_endian<T, 4>
+      {
+        static T
+        swap (T x)
+        {
+          union u4
+          {
+            T t;
+            char c[4];
+          };
+
+          u4 u;
+          u.t = x;
+
+          char tmp (u.c[0]);
+          u.c[0] = u.c[3];
+          u.c[3] = tmp;
+
+          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>
+      {
+        static T
+        swap (T x)
+        {
+          union u8
+          {
+            T t;
+            char c[8];
+          };
+
+          u8 u;
+          u.t = x;
+
+          char tmp (u.c[0]);
+          u.c[0] = u.c[7];
+          u.c[7] = tmp;
+
+          tmp = u.c[1];
+          u.c[1] = u.c[6];
+          u.c[6] = tmp;
+
+          tmp = u.c[2];
+          u.c[2] = u.c[5];
+          u.c[5] = tmp;
+
+          tmp = u.c[3];
+          u.c[3] = u.c[4];
+          u.c[4] = tmp;
+
+          return u.t;
+        }
+      };
+
+      class endian_traits
+      {
+      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);
+        }
+      };
+    }
+  }
+}
+
+#endif // ODB_PGSQL_DETAILS_ENDIAN_TRAITS_HXX