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/**********************************************************************
Utilities for byte operations
(c) 1994, 1995 Innobase Oy
Created 1/20/1994 Heikki Tuuri
***********************************************************************/
#ifndef ut0byte_h
#define ut0byte_h
#include "univ.i"
/* 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. */
typedef struct dulint_struct dulint;
struct dulint_struct{
ulint high; /* most significant 32 bits */
ulint low; /* least significant 32 bits */
};
/* Zero value for a dulint */
extern dulint ut_dulint_zero;
/* Maximum value for a dulint */
extern dulint ut_dulint_max;
/***********************************************************
Creates a 64-bit dulint out of two ulints. */
UNIV_INLINE
dulint
ut_dulint_create(
/*=============*/
/* out: created dulint */
ulint high, /* in: high-order 32 bits */
ulint low); /* in: low-order 32 bits */
/***********************************************************
Gets the high-order 32 bits of a dulint. */
UNIV_INLINE
ulint
ut_dulint_get_high(
/*===============*/
/* out: 32 bits in ulint */
dulint d); /* in: dulint */
/***********************************************************
Gets the low-order 32 bits of a dulint. */
UNIV_INLINE
ulint
ut_dulint_get_low(
/*==============*/
/* out: 32 bits in ulint */
dulint d); /* in: dulint */
/***********************************************************
Converts a dulint (a struct of 2 ulints) to ib_longlong, which is a 64-bit
integer type. */
UNIV_INLINE
ib_longlong
ut_conv_dulint_to_longlong(
/*=======================*/
/* out: value in ib_longlong type */
dulint d); /* in: dulint */
/***********************************************************
Tests if a dulint is zero. */
UNIV_INLINE
ibool
ut_dulint_is_zero(
/*==============*/
/* out: TRUE if zero */
dulint a); /* in: dulint */
/***********************************************************
Compares two dulints. */
UNIV_INLINE
int
ut_dulint_cmp(
/*==========*/
/* out: -1 if a < b, 0 if a == b,
1 if a > b */
dulint a, /* in: dulint */
dulint b); /* in: dulint */
/***********************************************************
Calculates the max of two dulints. */
UNIV_INLINE
dulint
ut_dulint_get_max(
/*==============*/
/* out: max(a, b) */
dulint a, /* in: dulint */
dulint b); /* in: dulint */
/***********************************************************
Calculates the min of two dulints. */
UNIV_INLINE
dulint
ut_dulint_get_min(
/*==============*/
/* out: min(a, b) */
dulint a, /* in: dulint */
dulint b); /* in: dulint */
/***********************************************************
Adds a ulint to a dulint. */
UNIV_INLINE
dulint
ut_dulint_add(
/*==========*/
/* out: sum a + b */
dulint a, /* in: dulint */
ulint b); /* in: ulint */
/***********************************************************
Subtracts a ulint from a dulint. */
UNIV_INLINE
dulint
ut_dulint_subtract(
/*===============*/
/* out: a - b */
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. */
UNIV_INLINE
ulint
ut_dulint_minus(
/*============*/
/* out: a - b */
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. */
UNIV_INLINE
dulint
ut_dulint_align_down(
/*=================*/
/* out: rounded value */
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. */
UNIV_INLINE
dulint
ut_dulint_align_up(
/*===============*/
/* out: rounded value */
dulint 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))
/****************************************************************
Sort function for dulint arrays. */
void
ut_dulint_sort(dulint* arr, dulint* aux_arr, ulint low, ulint high);
/*===============================================================*/
/************************************************************
The following function calculates the value of an integer n rounded
to the least product of align_no which is >= n. align_no has to be a
power of 2. */
UNIV_INLINE
ulint
ut_calc_align(
/*==========*/
/* out: rounded value */
ulint n, /* in: number to be rounded */
ulint align_no); /* in: align by this number */
/************************************************************
The following function calculates the value of an integer n rounded
to the biggest product of align_no which is <= n. align_no has to be a
power of 2. */
UNIV_INLINE
ulint
ut_calc_align_down(
/*===============*/
/* out: rounded value */
ulint n, /* in: number to be rounded */
ulint align_no); /* in: align by this number */
/*************************************************************
The following function rounds up a pointer to the nearest aligned address. */
UNIV_INLINE
void*
ut_align(
/*=====*/
/* out: aligned pointer */
void* ptr, /* in: pointer */
ulint align_no); /* in: align by this number */
/*************************************************************
The following function rounds down a pointer to the nearest
aligned address. */
UNIV_INLINE
void*
ut_align_down(
/*==========*/
/* out: aligned pointer */
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. */
UNIV_INLINE
ulint
ut_align_offset(
/*============*/
/* out: distance from aligned
pointer */
const void* ptr, /* in: pointer */
ulint align_no) /* in: align by this number */
__attribute__((const));
/*********************************************************************
Gets the nth bit of a ulint. */
UNIV_INLINE
ibool
ut_bit_get_nth(
/*===========*/
/* out: TRUE if nth bit is 1; 0th bit is defined to
be the least significant */
ulint a, /* in: ulint */
ulint n); /* in: nth bit requested */
/*********************************************************************
Sets the nth bit of a ulint. */
UNIV_INLINE
ulint
ut_bit_set_nth(
/*===========*/
/* out: the ulint with the bit set as requested */
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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