130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
// 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.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef BASE_ENDIAN_H
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#define BASE_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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//----------------------------------------------------------------
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/* An old glic doesn't provide these macros */
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#if !defined(htole16) || !defined(le16toh) || !defined(htole32) || !defined(le32toh) || !defined(htole64) || !defined(le64toh)
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#include <byteswap.h>
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define htole16(x) (x)
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#define le16toh(x) (x)
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#define htole32(x) (x)
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#define le32toh(x) (x)
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#define htole64(x) (x)
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#define le64toh(x) (x)
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#else
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#define htole16(x) __bswap_16(x)
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#define le16toh(x) __bswap_16(x)
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#define htole32(x) __bswap_32(x)
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#define le32toh(x) __bswap_32(x)
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#define htole64(x) __bswap_64(x)
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#define le64toh(x) __bswap_64(x)
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#endif
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#endif
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namespace base {
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// These are just little wrapper types to make the compiler
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// understand that the le types are not assignable to the
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// corresponding cpu type.
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struct le16 {
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explicit le16(uint16_t v = 0)
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: v_(v) {
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}
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uint16_t v_;
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} __attribute__((packed));
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struct le32 {
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explicit le32(uint32_t v = 0)
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: v_(v) {
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}
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uint32_t v_;
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} __attribute__((packed));
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struct le64 {
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explicit le64(uint64_t v = 0)
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: v_(v) {
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}
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uint64_t v_;
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} __attribute__((packed));
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//--------------------------------
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// FIXME: actually do the conversions !
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template <typename CPUType, typename DiskType>
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CPUType to_cpu(DiskType const &d) {
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BOOST_STATIC_ASSERT(sizeof(d) == 0);
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}
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template <typename DiskType, typename CPUType>
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DiskType to_disk(CPUType const &v) {
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BOOST_STATIC_ASSERT(sizeof(v) == 0);
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}
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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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}
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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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}
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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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}
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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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}
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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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}
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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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//--------------------------------
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bool test_bit_le(void const *bits, unsigned b);
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void set_bit_le(void *bits, unsigned b);
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void clear_bit_le(void *bits, unsigned b);
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}
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//----------------------------------------------------------------
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#endif
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