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/*****************************************************************************

Copyright (c) 1994, 2023, Oracle and/or its affiliates.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.

This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation.  The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.

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, version 2.0, 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, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/**************************************************************//**
@file include/ut0byte.ic
Utilities for byte operations

Created 5/30/1994 Heikki Tuuri
*******************************************************************/

/*******************************************************//**
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 */
{
	ut_ad(high <= ULINT32_MASK);
	ut_ad(low <= ULINT32_MASK);
	return(((ib_uint64_t) high) << 32 | low);
}

/********************************************************//**
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 */
{
	ut_ad(align_no > 0);
	ut_ad(ut_is_2pow(align_no));

	return(n & ~((ib_uint64_t) align_no - 1));
}

/********************************************************//**
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 */
{
	ib_uint64_t	align_1 = (ib_uint64_t) align_no - 1;

	ut_ad(align_no > 0);
	ut_ad(ut_is_2pow(align_no));

	return((n + align_1) & ~align_1);
}

/*********************************************************//**
The following function rounds up a pointer to the nearest aligned address.
@return aligned pointer */
UNIV_INLINE
void*
ut_align(
/*=====*/
	const void*	ptr,		/*!< in: pointer */
	ulint		align_no)	/*!< in: align by this number */
{
	ut_ad(align_no > 0);
	ut_ad(((align_no - 1) & align_no) == 0);
	ut_ad(ptr);

	ut_ad(sizeof(void*) == sizeof(ulint));

	return((void*)((((ulint) ptr) + align_no - 1) & ~(align_no - 1)));
}

/*********************************************************//**
The following function rounds down a pointer to the nearest
aligned address.
@return aligned pointer */
UNIV_INLINE
void*
ut_align_down(
/*==========*/
	const void*	ptr,		/*!< in: pointer */
	ulint		align_no)	/*!< in: align by this number */
{
	ut_ad(align_no > 0);
	ut_ad(((align_no - 1) & align_no) == 0);
	ut_ad(ptr);

	ut_ad(sizeof(void*) == sizeof(ulint));

	return((void*)((((ulint) ptr)) & ~(align_no - 1)));
}

/*********************************************************//**
The following function computes the offset of a pointer from the nearest
aligned address.
@return distance from aligned pointer */
UNIV_INLINE
ulint
ut_align_offset(
/*============*/
	const void*	ptr,		/*!< in: pointer */
	ulint		align_no)	/*!< in: align by this number */
{
	ut_ad(align_no > 0);
	ut_ad(((align_no - 1) & align_no) == 0);
	ut_ad(ptr);

	ut_ad(sizeof(void*) == sizeof(ulint));

	return(((ulint) ptr) & (align_no - 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 */
{
	ut_ad(n < 8 * sizeof(ulint));
#if TRUE != 1
# error "TRUE != 1"
#endif
	return(1 & (a >> n));
}

/*****************************************************************//**
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 */
{
	ut_ad(n < 8 * sizeof(ulint));
#if TRUE != 1
# error "TRUE != 1"
#endif
	if (val) {
		return(((ulint) 1 << n) | a);
	} else {
		return(~((ulint) 1 << n) & a);
	}
}

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