thin-provisioning-tools/endian_utils.h
2011-08-22 10:42:13 +01:00

92 lines
1.8 KiB
C++

#ifndef ENDIAN_H
#define ENDIAN_H
#include <stdint.h>
#include <boost/static_assert.hpp>
//----------------------------------------------------------------
// FIXME: rename to endian
namespace base {
// These are just little wrapper types to make the compiler
// understand that the le types are not assignable to the
// corresponding cpu type.
struct __le16 {
explicit __le16(uint16_t v = 0)
: v_(v) {
}
uint16_t v_;
} __attribute__((packed));
struct __le32 {
explicit __le32(uint32_t v = 0)
: v_(v) {
}
uint32_t v_;
} __attribute__((packed));
struct __le64 {
explicit __le64(uint64_t v = 0)
: v_(v) {
}
uint64_t v_;
} __attribute__((packed));
//--------------------------------
// FIXME: actually do the conversions !
template <typename CPUType, typename DiskType>
CPUType to_cpu(DiskType const &d) {
BOOST_STATIC_ASSERT(sizeof(d) == 0);
}
template <typename DiskType, typename CPUType>
DiskType to_disk(CPUType const &v) {
BOOST_STATIC_ASSERT(sizeof(v) == 0);
}
template <>
inline uint16_t to_cpu<uint16_t, __le16>(__le16 const &d) {
return d.v_;
}
template <>
inline __le16 to_disk<__le16, uint16_t>(uint16_t const &v) {
return __le16(v);
}
template <>
inline uint32_t to_cpu<uint32_t, __le32>(__le32 const &d) {
return d.v_;
}
template <>
inline __le32 to_disk<__le32, uint32_t>(uint32_t const &v) {
return __le32(v);
}
template <>
inline uint64_t to_cpu<uint64_t, __le64>(__le64 const &d) {
return d.v_;
}
template <>
inline __le64 to_disk<__le64, uint64_t>(uint64_t const &v) {
return __le64(v);
}
//--------------------------------
bool test_bit_le(void const *bits, unsigned b);
void set_bit_le(void *bits, unsigned b);
void clear_bit_le(void *bits, unsigned b);
}
//----------------------------------------------------------------
#endif