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/*
* Mask inlines
* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <sys/types.h>
#include <assert.h>
#ifdef MASK_C
#define INLINE inline
#else
#define INLINE extern inline
#endif
#ifndef MASK_MASK
#define MASK_MAX 31
#endif
struct _mask {
unsigned int bits;
};
#define mask_bits(mask) ((mask)->bits)
INLINE unsigned int ld2(u_int32_t v)
{
unsigned r = 0;
if (v >= 0x10000) {
v >>= 16;
r += 16;
}
if (v >= 0x100) {
v >>= 8;
r += 8;
}
if (v >= 0x10) {
v >>= 4;
r += 4;
}
if (v >= 4) {
v >>= 2;
r += 2;
}
if (v >= 2)
r++;
return r;
}
INLINE unsigned int hweight32(u_int32_t v)
{
v = (v & 0x55555555) + ((v >> 1) & 0x55555555);
v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
v = (v & 0x0F0F0F0F) + ((v >> 4) & 0x0F0F0F0F);
v = (v & 0x00FF00FF) + ((v >> 8) & 0x00FF00FF);
return (v & 0x0000FFFF) + ((v >> 16) & 0x0000FFFF);
}
INLINE size_t mask_sizeof(void)
{
return sizeof(mask_t);
}
INLINE void mask_none(mask_t *mask)
{
mask_bits(mask) = 0;
}
INLINE void mask_any(mask_t *mask)
{
mask_bits(mask) = ~0U;
}
INLINE void mask_load(mask_t *mask, unsigned int msk)
{
mask_bits(mask) = msk;
}
INLINE int mask_empty(const mask_t *mask)
{
return mask_bits(mask) == 0;
}
INLINE int mask_full(const mask_t *mask)
{
return mask_bits(mask) == ~0U;
}
INLINE unsigned int mask_count(const mask_t *mask)
{
return hweight32(mask_bits(mask));
}
INLINE unsigned int mask_min(const mask_t *mask)
{
assert(!mask_empty(mask));
return ffs(mask_bits(mask)) - 1;
}
INLINE unsigned int mask_max(const mask_t *mask)
{
assert(!mask_empty(mask));
return ld2(mask_bits(mask));
}
INLINE void mask_set(mask_t *mask, unsigned int val)
{
assert(val <= MASK_MAX);
mask_bits(mask) |= (1U << val);
}
INLINE void mask_reset(mask_t *mask, unsigned int val)
{
assert(val <= MASK_MAX);
mask_bits(mask) &= ~(1U << val);
}
INLINE void mask_set_range(mask_t *mask, unsigned int from, unsigned int to)
{
assert(to <= MASK_MAX && from <= to);
mask_bits(mask) |= ((1U << (from - to + 1)) - 1) << from;
}
INLINE void mask_reset_range(mask_t *mask, unsigned int from, unsigned int to)
{
assert(to <= MASK_MAX && from <= to);
mask_bits(mask) &= ~(((1U << (from - to + 1)) - 1) << from);
}
INLINE void mask_leave(mask_t *mask, unsigned int val)
{
assert(val <= MASK_MAX);
mask_bits(mask) &= 1U << val;
}
INLINE void mask_intersect(mask_t *mask, const mask_t *v)
{
mask_bits(mask) &= mask_bits(v);
}
INLINE void mask_union(mask_t *mask, const mask_t *v)
{
mask_bits(mask) |= mask_bits(v);
}
INLINE int mask_eq(const mask_t *mask, const mask_t *v)
{
return mask_bits(mask) == mask_bits(v);
}
INLINE void mask_copy(mask_t *mask, const mask_t *v)
{
mask_bits(mask) = mask_bits(v);
}
INLINE int mask_test(const mask_t *mask, unsigned int val)
{
assert(val <= MASK_MAX);
return mask_bits(mask) & (1U << val);
}
INLINE int mask_single(const mask_t *mask)
{
assert(!mask_empty(mask));
return !(mask_bits(mask) & (mask_bits(mask) - 1));
}
INLINE int mask_refine(mask_t *mask, const mask_t *v)
{
mask_t old;
assert(!mask_empty(mask));
mask_copy(&old, mask);
mask_intersect(mask, v);
if (mask_empty(mask))
return -EINVAL;
return !mask_eq(mask, &old);
}
INLINE int mask_refine_first(mask_t *mask)
{
assert(!mask_empty(mask));
if (mask_single(mask))
return 0;
mask_leave(mask, mask_min(mask));
return 1;
}
INLINE int mask_refine_last(mask_t *mask)
{
assert(!mask_empty(mask));
if (mask_single(mask))
return 0;
mask_leave(mask, mask_max(mask));
return 1;
}
INLINE int mask_refine_min(mask_t *mask, unsigned int val)
{
assert(!mask_empty(mask));
if (mask_min(mask) >= val)
return 0;
mask_reset_range(mask, 0, val - 1);
if (mask_empty(mask))
return -EINVAL;
return 1;
}
INLINE int mask_refine_max(mask_t *mask, unsigned int val)
{
assert(!mask_empty(mask));
if (mask_max(mask) <= val)
return 0;
mask_reset_range(mask, val + 1, MASK_MAX);
if (mask_empty(mask))
return -EINVAL;
return 1;
}
INLINE int mask_refine_set(mask_t *mask, unsigned int val)
{
int changed;
assert(!mask_empty(mask));
changed = !mask_single(mask);
mask_leave(mask, val);
if (mask_empty(mask))
return -EINVAL;
return changed;
}
INLINE int mask_value(const mask_t *mask)
{
assert(!mask_empty(mask));
return mask_min(mask);
}
INLINE int mask_always_eq(const mask_t *m1, const mask_t *m2)
{
return mask_single(m1) && mask_single(m2) &&
mask_value(m1) == mask_value(m2);
}
INLINE int mask_never_eq(const mask_t *m1, const mask_t *m2)
{
return (mask_bits(m1) & mask_bits(m2)) == 0;
}
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