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Diffstat (limited to 'libodb-pgsql/odb/pgsql/details/endian-traits.hxx')
-rw-r--r-- | libodb-pgsql/odb/pgsql/details/endian-traits.hxx | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/libodb-pgsql/odb/pgsql/details/endian-traits.hxx b/libodb-pgsql/odb/pgsql/details/endian-traits.hxx new file mode 100644 index 0000000..532a4a3 --- /dev/null +++ b/libodb-pgsql/odb/pgsql/details/endian-traits.hxx @@ -0,0 +1,155 @@ +// file : odb/pgsql/details/endian-traits.hxx +// 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 + +#include <odb/pgsql/details/export.hxx> + +namespace odb +{ + // @@ Revise this. + // + namespace details + { + } + + namespace pgsql + { + namespace details + { + using namespace odb::details; + + template <typename T, std::size_t S = sizeof (T)> + struct swap_endian; + + template <typename T> + struct swap_endian<T, 1> + { + static T + swap (T x) + { + return x; + } + }; + + 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 LIBODB_PGSQL_EXPORT 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 |