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// file : pgsql/types/traits.hxx
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef TRAITS_HXX
#define TRAITS_HXX
#include <cassert>
#include <cstring> // std::memcpy, std::memset
#include <odb/pgsql/traits.hxx>
#include <odb/pgsql/details/endian-traits.hxx>
#include "test.hxx" // varbit, ubuffer, string_ptr
namespace odb
{
namespace pgsql
{
// The first 4 bytes of the image is a signed int specifying the
// number of significant bits contained by the BIT. The following
// bytes contain the bit data.
//
template <>
class value_traits<bitfield, id_bit>
{
public:
typedef bitfield value_type;
typedef bitfield query_type;
typedef unsigned char* image_type;
static void
set_value (bitfield& v,
const unsigned char* i,
std::size_t,
bool is_null)
{
if (!is_null)
{
assert (
details::endian_traits::ntoh (
*reinterpret_cast<const int*> (i)) == 4);
const unsigned char* d (i + 4);
v.a = *d >> 4 & 1;
v.b = (*d >> 5) & 1;
v.c = (*d >> 6) & 1;
v.d = (*d >> 7) & 1;
}
else
v.a = v.b = v.c = v.d = 0;
}
static void
set_image (unsigned char* i,
std::size_t,
std::size_t& n,
bool& is_null,
bitfield v)
{
is_null = false;
n = 5;
*reinterpret_cast<int*> (i) = details::endian_traits::hton (4);
*(i + 4) = v.a << 4 | (v.b << 5) | (v.c << 6) | (v.d << 7);
}
};
// The first 4 bytes of the image is a signed int specifying the
// number of significant bits contained by the VARBIT. The following
// bytes contain the VARBIT data.
//
template <>
class value_traits<varbit, id_varbit>
{
public:
typedef varbit value_type;
typedef varbit query_type;
typedef details::ubuffer image_type;
static void
set_value (varbit& v,
const details::ubuffer& b,
std::size_t n,
bool is_null)
{
if (!is_null)
{
v.size = static_cast<std::size_t> (
details::endian_traits::ntoh (
*reinterpret_cast<const int*> (b.data ())));
std::size_t byte_len (v.size / 8 + (v.size % 8 > 0 ? 1 : 0));
assert (n >= byte_len + 4);
v.ubuffer_.assign (b.data () + 4, byte_len);
}
else
{
v.size = 0;
v.ubuffer_.assign (0, 0);
}
}
static void
set_image (details::ubuffer& b,
std::size_t& n,
bool& is_null,
const varbit& v)
{
is_null = false;
n = 4 + v.size / 8 + (v.size % 8 > 0 ? 1 : 0);
if (n > b.capacity ())
b.capacity (n);
// PostgreSQL requires all trailing bits of a VARBIT image
// to be zero.
//
std::memset (b.data (), 0, b.capacity ());
*reinterpret_cast<int*> (b.data ()) =
details::endian_traits::hton (static_cast<int> (v.size));
if (v.size != 0)
std::memcpy (b.data () + 4, v.ubuffer_.data (), n - 4);
}
};
template <>
class value_traits<string_ptr, id_string>
{
public:
typedef string_ptr value_type;
typedef std::string query_type;
typedef details::buffer image_type;
static void
set_value (string_ptr& v,
const details::buffer& b,
std::size_t n,
bool is_null)
{
v.reset (is_null ? 0 : new std::string (b.data (), n));
}
static void
set_image (details::buffer& b,
std::size_t& n,
bool& is_null,
const string_ptr& v)
{
is_null = v.get () == 0;
if (!is_null)
{
n = v->size ();
if (n > b.capacity ())
b.capacity (n);
if (n != 0)
std::memcpy (b.data (), v->c_str (), n);
}
}
};
}
}
#endif // TRAITS_HXX
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