* Merge

--HG--
branch : trunk

1 files changed, 84 insertions, 0 deletions

diff --git a/externals/mysql/hash.h b/externals/mysql/hash.h
new file mode 100644
index 00000000000..c1797c8293c
--- /dev/null
+++ b/externals/mysql/hash.h
@@ -0,0 +1,84 @@
+/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
+
+   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 */
+
+/* Dynamic hashing of record with different key-length */
+
+#ifndef _hash_h
+#define _hash_h
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+  Overhead to store an element in hash
+  Can be used to approximate memory consumption for a hash
+ */
+#define HASH_OVERHEAD (sizeof(char*)*2)
+
+/* flags for hash_init */
+#define HASH_UNIQUE     1       /* hash_insert fails on duplicate key */
+
+typedef uchar *(*my_hash_get_key)(const uchar *,size_t*,my_bool);
+typedef void (*my_hash_free_key)(void *);
+typedef my_bool (*my_hash_walk_action)(void *,void *);
+
+typedef struct st_hash {
+  size_t key_offset,key_length;		/* Length of key if const length */
+  size_t blength;
+  ulong records;
+  uint flags;
+  DYNAMIC_ARRAY array;				/* Place for hash_keys */
+  my_hash_get_key get_key;
+  void (*free)(void *);
+  CHARSET_INFO *charset;
+} HASH;
+
+/* A search iterator state */
+typedef uint HASH_SEARCH_STATE;
+
+#define my_hash_init(A,B,C,D,E,F,G,H) \
+          _my_hash_init(A,0,B,C,D,E,F,G,H CALLER_INFO)
+#define my_hash_init2(A,B,C,D,E,F,G,H,I) \
+          _my_hash_init(A,B,C,D,E,F,G,H,I CALLER_INFO)
+my_bool _my_hash_init(HASH *hash, uint growth_size, CHARSET_INFO *charset,
+                      ulong default_array_elements, size_t key_offset,
+                      size_t key_length, my_hash_get_key get_key,
+                      void (*free_element)(void*),
+                      uint flags CALLER_INFO_PROTO);
+void my_hash_free(HASH *tree);
+void my_hash_reset(HASH *hash);
+uchar *my_hash_element(HASH *hash, ulong idx);
+uchar *my_hash_search(const HASH *info, const uchar *key, size_t length);
+uchar *my_hash_first(const HASH *info, const uchar *key, size_t length,
+                     HASH_SEARCH_STATE *state);
+uchar *my_hash_next(const HASH *info, const uchar *key, size_t length,
+                    HASH_SEARCH_STATE *state);
+my_bool my_hash_insert(HASH *info, const uchar *data);
+my_bool my_hash_delete(HASH *hash, uchar *record);
+my_bool my_hash_update(HASH *hash, uchar *record, uchar *old_key,
+                       size_t old_key_length);
+void my_hash_replace(HASH *hash, HASH_SEARCH_STATE *state, uchar *new_row);
+my_bool my_hash_check(HASH *hash); /* Only in debug library */
+my_bool my_hash_iterate(HASH *hash, my_hash_walk_action action, void *argument);
+
+#define my_hash_clear(H) bzero((char*) (H), sizeof(*(H)))
+#define my_hash_inited(H) ((H)->array.buffer != 0)
+#define my_hash_init_opt(A,B,C,D,E,F,G,H) \
+          (!my_hash_inited(A) && _my_hash_init(A,0,B,C,D,E,F,G, H CALLER_INFO))
+
+#ifdef	__cplusplus
+}
+#endif
+#endif