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/*****************************************************************************
Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.
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 St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/******************************************************************//**
@file include/ut0byte.h
Utilities for byte operations
Created 1/20/1994 Heikki Tuuri
***********************************************************************/
#ifndef ut0byte_h
#define ut0byte_h
#include "univ.i"
/** Pair of ulint integers. */
typedef struct dulint_struct dulint;
/** Type definition for a 64-bit unsigned integer, which works also
in 32-bit machines. NOTE! Access the fields only with the accessor
functions. This definition appears here only for the compiler to
know the size of a dulint. */
struct dulint_struct{
ulint high; /*!< most significant 32 bits */
ulint low; /*!< least significant 32 bits */
};
/** Zero value for a dulint */
extern const dulint ut_dulint_zero;
/** Maximum value for a dulint */
extern const dulint ut_dulint_max;
/*******************************************************//**
Creates a 64-bit dulint out of two ulints.
@return created dulint */
UNIV_INLINE
dulint
ut_dulint_create(
/*=============*/
ulint high, /*!< in: high-order 32 bits */
ulint low); /*!< in: low-order 32 bits */
/*******************************************************//**
Gets the high-order 32 bits of a dulint.
@return 32 bits in ulint */
UNIV_INLINE
ulint
ut_dulint_get_high(
/*===============*/
dulint d); /*!< in: dulint */
/*******************************************************//**
Gets the low-order 32 bits of a dulint.
@return 32 bits in ulint */
UNIV_INLINE
ulint
ut_dulint_get_low(
/*==============*/
dulint d); /*!< in: dulint */
/*******************************************************//**
Converts a dulint (a struct of 2 ulints) to ib_int64_t, which is a 64-bit
integer type.
@return value in ib_int64_t type */
UNIV_INLINE
ib_int64_t
ut_conv_dulint_to_longlong(
/*=======================*/
dulint d); /*!< in: dulint */
/*******************************************************//**
Tests if a dulint is zero.
@return TRUE if zero */
UNIV_INLINE
ibool
ut_dulint_is_zero(
/*==============*/
dulint a); /*!< in: dulint */
/*******************************************************//**
Compares two dulints.
@return -1 if a < b, 0 if a == b, 1 if a > b */
UNIV_INLINE
int
ut_dulint_cmp(
/*==========*/
dulint a, /*!< in: dulint */
dulint b); /*!< in: dulint */
/*******************************************************//**
Calculates the max of two dulints.
@return max(a, b) */
UNIV_INLINE
dulint
ut_dulint_get_max(
/*==============*/
dulint a, /*!< in: dulint */
dulint b); /*!< in: dulint */
/*******************************************************//**
Calculates the min of two dulints.
@return min(a, b) */
UNIV_INLINE
dulint
ut_dulint_get_min(
/*==============*/
dulint a, /*!< in: dulint */
dulint b); /*!< in: dulint */
/*******************************************************//**
Adds a ulint to a dulint.
@return sum a + b */
UNIV_INLINE
dulint
ut_dulint_add(
/*==========*/
dulint a, /*!< in: dulint */
ulint b); /*!< in: ulint */
/*******************************************************//**
Subtracts a ulint from a dulint.
@return a - b */
UNIV_INLINE
dulint
ut_dulint_subtract(
/*===============*/
dulint a, /*!< in: dulint */
ulint b); /*!< in: ulint, b <= a */
/*******************************************************//**
Subtracts a dulint from another. NOTE that the difference must be positive
and smaller that 4G.
@return a - b */
UNIV_INLINE
ulint
ut_dulint_minus(
/*============*/
dulint a, /*!< in: dulint; NOTE a must be >= b and at most
2 to power 32 - 1 greater */
dulint b); /*!< in: dulint */
/********************************************************//**
Rounds a dulint downward to a multiple of a power of 2.
@return rounded value */
UNIV_INLINE
dulint
ut_dulint_align_down(
/*=================*/
dulint n, /*!< in: number to be rounded */
ulint align_no); /*!< in: align by this number which must be a
power of 2 */
/********************************************************//**
Rounds a dulint upward to a multiple of a power of 2.
@return rounded value */
UNIV_INLINE
dulint
ut_dulint_align_up(
/*===============*/
dulint n, /*!< in: number to be rounded */
ulint align_no); /*!< in: align by this number which must be a
power of 2 */
/********************************************************//**
Rounds a dulint 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 */
/*******************************************************//**
Increments a dulint variable by 1. */
#define UT_DULINT_INC(D)\
{\
if ((D).low == 0xFFFFFFFFUL) {\
(D).high = (D).high + 1;\
(D).low = 0;\
} else {\
(D).low = (D).low + 1;\
}\
}
/*******************************************************//**
Tests if two dulints are equal. */
#define UT_DULINT_EQ(D1, D2) (((D1).low == (D2).low)\
&& ((D1).high == (D2).high))
#ifdef notdefined
/************************************************************//**
Sort function for dulint arrays. */
UNIV_INTERN
void
ut_dulint_sort(
/*===========*/
dulint* arr, /*!< in/out: array to be sorted */
dulint* aux_arr,/*!< in/out: auxiliary array (same size as arr) */
ulint low, /*!< in: low bound of sort interval, inclusive */
ulint high); /*!< in: high bound of sort interval, noninclusive */
#endif /* notdefined */
/*********************************************************//**
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 */
/*********************************************************//**
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 */
__attribute__((const));
/*********************************************************//**
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 */
__attribute__((const));
/*****************************************************************//**
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 */
#ifndef UNIV_NONINL
#include "ut0byte.ic"
#endif
#endif
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