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/******************************************************************
Utilities for byte operations
(c) 1994, 1995 Innobase Oy
Created 5/30/1994 Heikki Tuuri
*******************************************************************/
/***********************************************************
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 */
{
dulint res;
ut_ad(high <= 0xFFFFFFFF);
ut_ad(low <= 0xFFFFFFFF);
res.high = high;
res.low = low;
return(res);
}
/***********************************************************
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 */
{
return(d.high);
}
/***********************************************************
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 */
{
return(d.low);
}
/***********************************************************
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 */
{
return((ib_longlong)d.low
+ (((ib_longlong)d.high) << 32));
}
/***********************************************************
Tests if a dulint is zero. */
UNIV_INLINE
ibool
ut_dulint_is_zero(
/*==============*/
/* out: TRUE if zero */
dulint a) /* in: dulint */
{
if ((a.low == 0) && (a.high == 0)) {
return(TRUE);
}
return(FALSE);
}
/***********************************************************
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 */
{
if (a.high > b.high) {
return(1);
} else if (a.high < b.high) {
return(-1);
} else if (a.low > b.low) {
return(1);
} else if (a.low < b.low) {
return(-1);
} else {
return(0);
}
}
/***********************************************************
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 */
{
if (ut_dulint_cmp(a, b) > 0) {
return(a);
}
return(b);
}
/***********************************************************
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 */
{
if (ut_dulint_cmp(a, b) > 0) {
return(b);
}
return(a);
}
/***********************************************************
Adds a ulint to a dulint. */
UNIV_INLINE
dulint
ut_dulint_add(
/*==========*/
/* out: sum a + b */
dulint a, /* in: dulint */
ulint b) /* in: ulint */
{
if (0xFFFFFFFFUL - b >= a.low) {
a.low += b;
return(a);
}
a.low = a.low - (0xFFFFFFFFUL - b) - 1;
a.high++;
return(a);
}
/***********************************************************
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 */
{
if (a.low >= b) {
a.low -= b;
return(a);
}
b -= a.low + 1;
a.low = 0xFFFFFFFFUL - b;
ut_ad(a.high > 0);
a.high--;
return(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 */
{
ulint diff;
if (a.high == b.high) {
ut_ad(a.low >= b.low);
return(a.low - b.low);
}
ut_ad(a.high == b.high + 1);
diff = (ulint)(0xFFFFFFFFUL - b.low);
diff += 1 + a.low;
ut_ad(diff > a.low);
return(diff);
}
/************************************************************
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 */
{
ulint low, high;
ut_ad(align_no > 0);
ut_ad(((align_no - 1) & align_no) == 0);
low = ut_dulint_get_low(n);
high = ut_dulint_get_high(n);
low = low & ~(align_no - 1);
return(ut_dulint_create(high, low));
}
/************************************************************
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 */
{
return(ut_dulint_align_down(ut_dulint_add(n, align_no - 1), align_no));
}
/************************************************************
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 */
{
ut_ad(align_no > 0);
ut_ad(((align_no - 1) & align_no) == 0);
return((n + align_no - 1) & ~(align_no - 1));
}
/*************************************************************
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 */
{
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 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 */
{
ut_ad(align_no > 0);
ut_ad(((align_no - 1) & align_no) == 0);
return(n & ~(align_no - 1));
}
/*************************************************************
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 */
{
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. */
UNIV_INLINE
ulint
ut_align_offset(
/*============*/
/* out: distance from
aligned pointer */
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. */
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 */
{
ut_ad(n < 8 * sizeof(ulint));
ut_ad(TRUE == 1);
return(1 & (a >> n));
}
/*********************************************************************
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 */
{
ut_ad(n < 8 * sizeof(ulint));
ut_ad(TRUE == 1);
if (val) {
return((1 << n) | a);
} else {
return(~(1 << n) & a);
}
}
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