1 files changed, 144 insertions, 0 deletions
diff --git a/mysql/my_bitmap.h b/mysql/my_bitmap.h
new file mode 100644
index 0000000..f45c1bc
--- /dev/null
+++ b/mysql/my_bitmap.h
@@ -0,0 +1,144 @@
+/*
+   Copyright (c) 2001, 2015, Oracle and/or its affiliates. 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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
+
+#ifndef _my_bitmap_h_
+#define _my_bitmap_h_
+
+#define MY_BIT_NONE (~(uint) 0)
+
+#include <m_string.h>
+#include "mysql/psi/mysql_thread.h"   /* mysql_mutex_t */
+
+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
+   */
+  mysql_mutex_t *mutex;
+} 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_get_next_set(const MY_BITMAP *map, uint bitmap_bit);
+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);
+/* 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)
+
+static inline void bitmap_set_bit(MY_BITMAP *map, uint bit)
+{
+  DBUG_ASSERT(bit < map->n_bits);
+  ((uchar*)map->bitmap)[bit / 8] |= (1 << (bit & 7));
+}
+
+
+static inline void bitmap_flip_bit(MY_BITMAP *map, uint bit)
+{
+  DBUG_ASSERT(bit < map->n_bits);
+  ((uchar*)map->bitmap)[bit / 8] ^= (1 << (bit & 7));
+}
+
+
+static inline void bitmap_clear_bit(MY_BITMAP *map, uint bit)
+{
+  DBUG_ASSERT(bit < map->n_bits);
+  ((uchar*)map->bitmap)[bit / 8] &= ~(1 << (bit & 7));
+}
+
+
+static inline my_bool bitmap_is_set(const MY_BITMAP *map, uint bit)
+{
+  DBUG_ASSERT(bit < map->n_bits);
+  return ((uchar*)map->bitmap)[bit / 8] & (1 << (bit & 7));
+}
+
+/**
+   Quite unlike other C comparison functions ending with 'cmp', e.g. memcmp(),
+   strcmp(), this function returns true if the bitmaps are equal, and false
+   otherwise.
+
+   @retval true The bitmaps are equal.
+   @retval false The bitmaps differ.
+ */
+static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2)
+{
+  DBUG_ASSERT(map1->n_bits > 0);
+  DBUG_ASSERT(map2->n_bits > 0);
+
+  if (memcmp(map1->bitmap, map2->bitmap, 4*(no_words_in_map(map1)-1)) != 0)
+    return FALSE;
+  return ((*map1->last_word_ptr | map1->last_word_mask) ==
+          (*map2->last_word_ptr | map2->last_word_mask));
+}
+
+/*
+  Clears all bits. This is allowed even for a zero-size bitmap.
+ */
+static inline void bitmap_clear_all(MY_BITMAP *map)
+{
+  memset(map->bitmap, 0, 4 * no_words_in_map(map));
+}
+
+/*
+  Sets all bits. This is allowed even for a zero-size bitmap.
+ */
+static inline void bitmap_set_all(MY_BITMAP *map)
+{
+  memset(map->bitmap, 0xFF, 4 * no_words_in_map(map));
+}
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _my_bitmap_h_ */