thin-provisioning-tools/base/endian_utils.h
2013-11-19 10:23:35 +00:00

110 lines
2.6 KiB
C++

// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
//
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#ifndef BASE_ENDIAN_H
#define BASE_ENDIAN_H
#include <endian.h>
#include <stdint.h>
#include <boost/static_assert.hpp>
//----------------------------------------------------------------
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 le16toh(d.v_);
}
template <>
inline le16 to_disk<le16, uint16_t>(uint16_t const &v) {
return le16(htole16(v));
}
template <>
inline uint32_t to_cpu<uint32_t, le32>(le32 const &d) {
return le32toh(d.v_);
}
template <>
inline le32 to_disk<le32, uint32_t>(uint32_t const &v) {
return le32(htole32(v));
}
template <>
inline uint64_t to_cpu<uint64_t, le64>(le64 const &d) {
return le64toh(d.v_);
}
template <>
inline le64 to_disk<le64, uint64_t>(uint64_t const &v) {
return le64(htole64(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