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/*****************************************************************************
Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2019, 2020, MariaDB Corporation.
This program 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; version 2 of the License.
This program 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
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/******************************************************************//**
@file include/ut0byte.h
Utilities for byte operations
Created 1/20/1994 Heikki Tuuri
***********************************************************************/
#ifndef ut0byte_h
#define ut0byte_h
#include "univ.i"
/*******************************************************//**
Creates a 64-bit integer out of two 32-bit integers.
@return created integer */
UNIV_INLINE
ib_uint64_t
ut_ull_create(
/*==========*/
ulint high, /*!< in: high-order 32 bits */
ulint low) /*!< in: low-order 32 bits */
MY_ATTRIBUTE((const));
/********************************************************//**
Rounds a 64-bit integer downward to a multiple of a power of 2.
@return rounded value */
UNIV_INLINE
ib_uint64_t
ut_uint64_align_down(
/*=================*/
ib_uint64_t n, /*!< in: number to be rounded */
ulint align_no); /*!< in: align by this number
which must be a power of 2 */
/********************************************************//**
Rounds ib_uint64_t upward to a multiple of a power of 2.
@return rounded value */
UNIV_INLINE
ib_uint64_t
ut_uint64_align_up(
/*===============*/
ib_uint64_t n, /*!< in: number to be rounded */
ulint align_no); /*!< in: align by this number
which must be a power of 2 */
/** Round down a pointer to the nearest aligned address.
@param ptr pointer
@param alignment a power of 2
@return aligned pointer */
static inline void *ut_align_down(void *ptr, size_t alignment)
{
ut_ad(alignment > 0);
ut_ad(ut_is_2pow(alignment));
ut_ad(ptr);
static_assert(sizeof ptr == sizeof(size_t), "compatibility");
return reinterpret_cast<void*>(reinterpret_cast<size_t>(ptr) &
~(alignment - 1));
}
static inline const void *ut_align_down(const void *ptr, size_t alignment)
{
return ut_align_down(const_cast<void*>(ptr), alignment);
}
/** Compute the offset of a pointer from the nearest aligned address.
@param ptr pointer
@param alignment a power of 2
@return distance from aligned pointer */
inline size_t ut_align_offset(const void *ptr, size_t alignment)
{
ut_ad(alignment > 0);
ut_ad(ut_is_2pow(alignment));
ut_ad(ptr);
return reinterpret_cast<size_t>(ptr) & (alignment - 1);
}
/*****************************************************************//**
Gets the nth bit of a ulint.
@return TRUE if nth bit is 1; 0th bit is defined to be the least significant */
UNIV_INLINE
ibool
ut_bit_get_nth(
/*===========*/
ulint a, /*!< in: ulint */
ulint n); /*!< in: nth bit requested */
/*****************************************************************//**
Sets the nth bit of a ulint.
@return the ulint with the bit set as requested */
UNIV_INLINE
ulint
ut_bit_set_nth(
/*===========*/
ulint a, /*!< in: ulint */
ulint n, /*!< in: nth bit requested */
ibool val); /*!< in: value for the bit to set */
#include "ut0byte.inl"
#endif
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