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my_bitmap.h
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my_bitmap.h
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/* Copyright (C) 2000 MySQL AB
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef _my_bitmap_h_
#define _my_bitmap_h_
#define MY_BIT_NONE (~(uint) 0)
#include <m_string.h>
typedef uint32 my_bitmap_map;
typedef struct st_bitmap
{
my_bitmap_map *bitmap;
uint n_bits; /* number of bits occupied by the above */
my_bitmap_map last_word_mask;
my_bitmap_map *last_word_ptr;
/*
mutex will be acquired for the duration of each bitmap operation if
thread_safe flag in bitmap_init was set. Otherwise, we optimize by not
acquiring the mutex
*/
#ifdef THREAD
pthread_mutex_t *mutex;
#endif
} MY_BITMAP;
#ifdef __cplusplus
extern "C" {
#endif
extern void create_last_word_mask(MY_BITMAP *map);
extern my_bool bitmap_init(MY_BITMAP *map, my_bitmap_map *buf, uint n_bits,
my_bool thread_safe);
extern my_bool bitmap_is_clear_all(const MY_BITMAP *map);
extern my_bool bitmap_is_prefix(const MY_BITMAP *map, uint prefix_size);
extern my_bool bitmap_is_set_all(const MY_BITMAP *map);
extern my_bool bitmap_is_subset(const MY_BITMAP *map1, const MY_BITMAP *map2);
extern my_bool bitmap_is_overlapping(const MY_BITMAP *map1,
const MY_BITMAP *map2);
extern my_bool bitmap_test_and_set(MY_BITMAP *map, uint bitmap_bit);
extern my_bool bitmap_test_and_clear(MY_BITMAP *map, uint bitmap_bit);
extern my_bool bitmap_fast_test_and_set(MY_BITMAP *map, uint bitmap_bit);
extern uint bitmap_set_next(MY_BITMAP *map);
extern uint bitmap_get_first(const MY_BITMAP *map);
extern uint bitmap_get_first_set(const MY_BITMAP *map);
extern uint bitmap_bits_set(const MY_BITMAP *map);
extern void bitmap_free(MY_BITMAP *map);
extern void bitmap_set_above(MY_BITMAP *map, uint from_byte, uint use_bit);
extern void bitmap_set_prefix(MY_BITMAP *map, uint prefix_size);
extern void bitmap_intersect(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_subtract(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_xor(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_invert(MY_BITMAP *map);
extern void bitmap_copy(MY_BITMAP *map, const MY_BITMAP *map2);
extern uint bitmap_lock_set_next(MY_BITMAP *map);
extern void bitmap_lock_clear_bit(MY_BITMAP *map, uint bitmap_bit);
#ifdef NOT_USED
extern uint bitmap_lock_bits_set(const MY_BITMAP *map);
extern my_bool bitmap_lock_is_set_all(const MY_BITMAP *map);
extern uint bitmap_lock_get_first(const MY_BITMAP *map);
extern uint bitmap_lock_get_first_set(const MY_BITMAP *map);
extern my_bool bitmap_lock_is_subset(const MY_BITMAP *map1,
const MY_BITMAP *map2);
extern my_bool bitmap_lock_is_prefix(const MY_BITMAP *map, uint prefix_size);
extern my_bool bitmap_lock_is_set(const MY_BITMAP *map, uint bitmap_bit);
extern my_bool bitmap_lock_is_clear_all(const MY_BITMAP *map);
extern my_bool bitmap_lock_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2);
extern void bitmap_lock_set_all(MY_BITMAP *map);
extern void bitmap_lock_clear_all(MY_BITMAP *map);
extern void bitmap_lock_set_bit(MY_BITMAP *map, uint bitmap_bit);
extern void bitmap_lock_flip_bit(MY_BITMAP *map, uint bitmap_bit);
extern void bitmap_lock_set_prefix(MY_BITMAP *map, uint prefix_size);
extern void bitmap_lock_intersect(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_lock_subtract(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_lock_union(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_lock_xor(MY_BITMAP *map, const MY_BITMAP *map2);
extern void bitmap_lock_invert(MY_BITMAP *map);
#endif
/* Fast, not thread safe, bitmap functions */
#define bitmap_buffer_size(bits) (((bits)+31)/32)*4
#define no_bytes_in_map(map) (((map)->n_bits + 7)/8)
#define no_words_in_map(map) (((map)->n_bits + 31)/32)
#define bytes_word_aligned(bytes) (4*((bytes + 3)/4))
#define _bitmap_set_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
|= (1 << ((BIT) & 7)))
#define _bitmap_flip_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
^= (1 << ((BIT) & 7)))
#define _bitmap_clear_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
&= ~ (1 << ((BIT) & 7)))
#define _bitmap_is_set(MAP, BIT) (uint) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
& (1 << ((BIT) & 7)))
/*
WARNING!
The below symbols are inline functions in DEBUG builds and macros in
non-DEBUG builds. The latter evaluate their 'bit' argument twice.
NEVER use an increment/decrement operator with the 'bit' argument.
It would work with DEBUG builds, but fails later in production builds!
FORBIDDEN: bitmap_set_bit($my_bitmap, (field++)->field_index);
*/
#ifndef DBUG_OFF
static inline void
bitmap_set_bit(MY_BITMAP *map,uint bit)
{
DBUG_ASSERT(bit < (map)->n_bits);
_bitmap_set_bit(map,bit);
}
static inline void
bitmap_flip_bit(MY_BITMAP *map,uint bit)
{
DBUG_ASSERT(bit < (map)->n_bits);
_bitmap_flip_bit(map,bit);
}
static inline void
bitmap_clear_bit(MY_BITMAP *map,uint bit)
{
DBUG_ASSERT(bit < (map)->n_bits);
_bitmap_clear_bit(map,bit);
}
static inline uint
bitmap_is_set(const MY_BITMAP *map,uint bit)
{
DBUG_ASSERT(bit < (map)->n_bits);
return _bitmap_is_set(map,bit);
}
#else
#define bitmap_set_bit(MAP, BIT) _bitmap_set_bit(MAP, BIT)
#define bitmap_flip_bit(MAP, BIT) _bitmap_flip_bit(MAP, BIT)
#define bitmap_clear_bit(MAP, BIT) _bitmap_clear_bit(MAP, BIT)
#define bitmap_is_set(MAP, BIT) _bitmap_is_set(MAP, BIT)
#endif
static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2)
{
*(map1)->last_word_ptr|= (map1)->last_word_mask;
*(map2)->last_word_ptr|= (map2)->last_word_mask;
return memcmp((map1)->bitmap, (map2)->bitmap, 4*no_words_in_map((map1)))==0;
}
#define bitmap_clear_all(MAP) \
{ memset((MAP)->bitmap, 0, 4*no_words_in_map((MAP))); }
#define bitmap_set_all(MAP) \
(memset((MAP)->bitmap, 0xFF, 4*no_words_in_map((MAP))))
/**
check, set and clear a bit of interest of an integer.
If the bit is out of range @retval -1. Otherwise
bit_is_set @return 0 or 1 reflecting the bit is set or not;
bit_do_set @return 1 (bit is set 1)
bit_do_clear @return 0 (bit is cleared to 0)
*/
#define bit_is_set(I,B) (sizeof(I) * CHAR_BIT > (B) ? \
(((I) & (ULL(1) << (B))) == 0 ? 0 : 1) : -1)
#define bit_do_set(I,B) (sizeof(I) * CHAR_BIT > (B) ? \
((I) |= (ULL(1) << (B)), 1) : -1)
#define bit_do_clear(I,B) (sizeof(I) * CHAR_BIT > (B) ? \
((I) &= ~(ULL(1) << (B)), 0) : -1)
#ifdef __cplusplus
}
#endif
#endif /* _my_bitmap_h_ */