mirror of
https://github.com/MariaDB/server.git
synced 2025-05-12 16:59:54 +02:00
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
|
|
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
|
|
#ident "$Id$"
|
|
/*======
|
|
This file is part of PerconaFT.
|
|
|
|
|
|
Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
|
|
|
|
PerconaFT is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License, version 2,
|
|
as published by the Free Software Foundation.
|
|
|
|
PerconaFT 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 PerconaFT. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
----------------------------------------
|
|
|
|
PerconaFT is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License, version 3,
|
|
as published by the Free Software Foundation.
|
|
|
|
PerconaFT 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 Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
|
|
======= */
|
|
|
|
#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
|
|
|
|
#pragma once
|
|
|
|
/* Purpose of this file is to provide definitions of
|
|
* Host to Disk byte transposition functions, an abstraction of
|
|
* htod32()/dtoh32() and htod16()/dtoh16() functions.
|
|
*
|
|
* These htod/dtoh functions will only perform the transposition
|
|
* if the disk and host are defined to be in opposite endian-ness.
|
|
* If we define the disk to be in host order, then no byte
|
|
* transposition is performed. (We might do this to save the
|
|
* the time used for byte transposition.)
|
|
*
|
|
* This abstraction layer allows us to define the disk to be in
|
|
* any byte order with a single compile-time switch (in htod.c).
|
|
*
|
|
* NOTE: THIS FILE DOES NOT CURRENTLY SUPPORT A BIG-ENDIAN
|
|
* HOST AND A LITTLE-ENDIAN DISK.
|
|
*/
|
|
|
|
#include <portability/toku_config.h>
|
|
|
|
#if defined(HAVE_ENDIAN_H)
|
|
# include <endian.h>
|
|
#elif defined(HAVE_MACHINE_ENDIAN_H)
|
|
# include <machine/endian.h>
|
|
# define __BYTE_ORDER __DARWIN_BYTE_ORDER
|
|
# define __LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
|
|
# define __BIG_ENDIAN __DARWIN_BIG_ENDIAN
|
|
#endif
|
|
#if !defined(__BYTE_ORDER) || \
|
|
!defined(__LITTLE_ENDIAN) || \
|
|
!defined(__BIG_ENDIAN)
|
|
#error Standard endianness things not all defined
|
|
#endif
|
|
|
|
|
|
static const int64_t toku_byte_order_host = 0x0102030405060708LL;
|
|
|
|
#define NETWORK_BYTE_ORDER (__BIG_ENDIAN)
|
|
#define INTEL_BYTE_ORDER (__LITTLE_ENDIAN)
|
|
#define HOST_BYTE_ORDER (__BYTE_ORDER)
|
|
|
|
//DISK_BYTE_ORDER is the byte ordering for integers written to disk.
|
|
//If DISK_BYTE_ORDER is the same as HOST_BYTE_ORDER no conversions are necessary.
|
|
//Otherwise some structures require conversion to HOST_BYTE_ORDER on loading from disk (HOST_BYTE_ORDER in memory), and
|
|
//others require conversion to HOST_BYTE_ORDER on every access/mutate (DISK_BYTE_ORDER in memory).
|
|
#define DISK_BYTE_ORDER (INTEL_BYTE_ORDER)
|
|
|
|
#if HOST_BYTE_ORDER!=INTEL_BYTE_ORDER
|
|
//Even though the functions are noops if DISK==HOST, we do not have the logic to test whether the file was moved from another BYTE_ORDER machine.
|
|
#error Only intel byte order supported so far.
|
|
#endif
|
|
|
|
#if DISK_BYTE_ORDER == HOST_BYTE_ORDER
|
|
static inline uint64_t
|
|
toku_dtoh64(uint64_t i) {
|
|
return i;
|
|
}
|
|
|
|
static inline uint64_t
|
|
toku_htod64(uint64_t i) {
|
|
return i;
|
|
}
|
|
|
|
static inline uint32_t
|
|
toku_dtoh32(uint32_t i) {
|
|
return i;
|
|
}
|
|
|
|
static inline uint32_t
|
|
toku_htod32(uint32_t i) {
|
|
return i;
|
|
}
|
|
#else
|
|
#error Not supported
|
|
#endif
|