diff options
author | Constantin Michael <constantin@codesynthesis.com> | 2011-05-26 16:27:43 +0200 |
---|---|---|
committer | Constantin Michael <constantin@codesynthesis.com> | 2011-05-26 16:27:43 +0200 |
commit | 3f94b73f025f2fa3e08edf07270225c4a5c391c1 (patch) | |
tree | 0ef3b1e39bf2d25aebf54c8ce6ccc58e49754151 /odb/pgsql/endian-traits.hxx | |
parent | d898c4df75e10a6aa0704ffd9952da73ee7d4060 (diff) |
Add host endian detection and endian conversion algorithms
Diffstat (limited to 'odb/pgsql/endian-traits.hxx')
-rw-r--r-- | odb/pgsql/endian-traits.hxx | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/odb/pgsql/endian-traits.hxx b/odb/pgsql/endian-traits.hxx new file mode 100644 index 0000000..07dc023 --- /dev/null +++ b/odb/pgsql/endian-traits.hxx @@ -0,0 +1,109 @@ +// file : odb/pgsql/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_ENDIAN_TRAITS_HXX +#define ODB_PGSQL_ENDIAN_TRAITS_HXX + +#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> + { + static T + swap (T x) + { + union u2 + { + T t; + char c[2]; + }; + + u2 u; + u.t = x; + std::reverse (u.c, u.c + 2); + + 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; + std::reverse (u.c, u.c + 4); + + 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; + std::reverse (u.c, u.c + 8); + + return u.t; + } + }; + + class endian_traits + { + public: + enum endian + { + big_endian, + little_endian + }; + + public: + static const endian host_endian; + + public: + + template <typename T> + static T + hton (T x) + { + return host_endian == big_endian ? x : swap_endian<T>::swap (x); + } + + template <typename T> + static T + ntoh (T x) + { + return host_endian == big_endian ? x : swap_endian<T>::swap (x); + } + }; + } +} + +#endif // ODB_PGSQL_ENDIAN_TRAITS_HXX |