thin-provisioning-tools/persistent-data/endian_utils.h

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// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// 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/>.
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#ifndef ENDIAN_H
#define ENDIAN_H
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#include <endian.h>
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#include <stdint.h>
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#include <boost/static_assert.hpp>
//----------------------------------------------------------------
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// FIXME: rename to endian
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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 {
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explicit __le16(uint16_t v = 0)
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: v_(v) {
}
uint16_t v_;
} __attribute__((packed));
struct __le32 {
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explicit __le32(uint32_t v = 0)
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: v_(v) {
}
uint32_t v_;
} __attribute__((packed));
struct __le64 {
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explicit __le64(uint64_t v = 0)
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: v_(v) {
}
uint64_t v_;
} __attribute__((packed));
//--------------------------------
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// FIXME: actually do the conversions !
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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 <>
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inline uint16_t to_cpu<uint16_t, __le16>(__le16 const &d) {
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return le16toh(d.v_);
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}
template <>
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inline __le16 to_disk<__le16, uint16_t>(uint16_t const &v) {
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return __le16(htole16(v));
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}
template <>
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inline uint32_t to_cpu<uint32_t, __le32>(__le32 const &d) {
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return le32toh(d.v_);
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}
template <>
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inline __le32 to_disk<__le32, uint32_t>(uint32_t const &v) {
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return __le32(htole32(v));
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}
template <>
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inline uint64_t to_cpu<uint64_t, __le64>(__le64 const &d) {
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return le64toh(d.v_);
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}
template <>
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inline __le64 to_disk<__le64, uint64_t>(uint64_t const &v) {
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return __le64(htole64(v));
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}
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//--------------------------------
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);
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}
//----------------------------------------------------------------
#endif