summaryrefslogtreecommitdiff
path: root/mkfs.ubifs/hashtable/hashtable.h
diff options
context:
space:
mode:
Diffstat (limited to 'mkfs.ubifs/hashtable/hashtable.h')
-rw-r--r--mkfs.ubifs/hashtable/hashtable.h199
1 files changed, 0 insertions, 199 deletions
diff --git a/mkfs.ubifs/hashtable/hashtable.h b/mkfs.ubifs/hashtable/hashtable.h
deleted file mode 100644
index c0b0acd..0000000
--- a/mkfs.ubifs/hashtable/hashtable.h
+++ /dev/null
@@ -1,199 +0,0 @@
-/* Copyright (C) 2002 Christopher Clark <firstname.lastname@cl.cam.ac.uk> */
-
-#ifndef __HASHTABLE_CWC22_H__
-#define __HASHTABLE_CWC22_H__
-
-struct hashtable;
-
-/* Example of use:
- *
- * struct hashtable *h;
- * struct some_key *k;
- * struct some_value *v;
- *
- * static unsigned int hash_from_key_fn( void *k );
- * static int keys_equal_fn ( void *key1, void *key2 );
- *
- * h = create_hashtable(16, hash_from_key_fn, keys_equal_fn);
- * k = (struct some_key *) malloc(sizeof(struct some_key));
- * v = (struct some_value *) malloc(sizeof(struct some_value));
- *
- * (initialise k and v to suitable values)
- *
- * if (! hashtable_insert(h,k,v) )
- * { exit(-1); }
- *
- * if (NULL == (found = hashtable_search(h,k) ))
- * { printf("not found!"); }
- *
- * if (NULL == (found = hashtable_remove(h,k) ))
- * { printf("Not found\n"); }
- *
- */
-
-/* Macros may be used to define type-safe(r) hashtable access functions, with
- * methods specialized to take known key and value types as parameters.
- *
- * Example:
- *
- * Insert this at the start of your file:
- *
- * DEFINE_HASHTABLE_INSERT(insert_some, struct some_key, struct some_value);
- * DEFINE_HASHTABLE_SEARCH(search_some, struct some_key, struct some_value);
- * DEFINE_HASHTABLE_REMOVE(remove_some, struct some_key, struct some_value);
- *
- * This defines the functions 'insert_some', 'search_some' and 'remove_some'.
- * These operate just like hashtable_insert etc., with the same parameters,
- * but their function signatures have 'struct some_key *' rather than
- * 'void *', and hence can generate compile time errors if your program is
- * supplying incorrect data as a key (and similarly for value).
- *
- * Note that the hash and key equality functions passed to create_hashtable
- * still take 'void *' parameters instead of 'some key *'. This shouldn't be
- * a difficult issue as they're only defined and passed once, and the other
- * functions will ensure that only valid keys are supplied to them.
- *
- * The cost for this checking is increased code size and runtime overhead
- * - if performance is important, it may be worth switching back to the
- * unsafe methods once your program has been debugged with the safe methods.
- * This just requires switching to some simple alternative defines - eg:
- * #define insert_some hashtable_insert
- *
- */
-
-/*****************************************************************************
- * create_hashtable
-
- * @name create_hashtable
- * @param minsize minimum initial size of hashtable
- * @param hashfunction function for hashing keys
- * @param key_eq_fn function for determining key equality
- * @return newly created hashtable or NULL on failure
- */
-
-struct hashtable *
-create_hashtable(unsigned int minsize,
- unsigned int (*hashfunction) (void*),
- int (*key_eq_fn) (void*,void*));
-
-/*****************************************************************************
- * hashtable_insert
-
- * @name hashtable_insert
- * @param h the hashtable to insert into
- * @param k the key - hashtable claims ownership and will free on removal
- * @param v the value - does not claim ownership
- * @return non-zero for successful insertion
- *
- * This function will cause the table to expand if the insertion would take
- * the ratio of entries to table size over the maximum load factor.
- *
- * This function does not check for repeated insertions with a duplicate key.
- * The value returned when using a duplicate key is undefined -- when
- * the hashtable changes size, the order of retrieval of duplicate key
- * entries is reversed.
- * If in doubt, remove before insert.
- */
-
-int
-hashtable_insert(struct hashtable *h, void *k, void *v);
-
-#define DEFINE_HASHTABLE_INSERT(fnname, keytype, valuetype) \
-int fnname (struct hashtable *h, keytype *k, valuetype *v) \
-{ \
- return hashtable_insert(h,k,v); \
-}
-
-/*****************************************************************************
- * hashtable_search
-
- * @name hashtable_search
- * @param h the hashtable to search
- * @param k the key to search for - does not claim ownership
- * @return the value associated with the key, or NULL if none found
- */
-
-void *
-hashtable_search(struct hashtable *h, void *k);
-
-#define DEFINE_HASHTABLE_SEARCH(fnname, keytype, valuetype) \
-valuetype * fnname (struct hashtable *h, keytype *k) \
-{ \
- return (valuetype *) (hashtable_search(h,k)); \
-}
-
-/*****************************************************************************
- * hashtable_remove
-
- * @name hashtable_remove
- * @param h the hashtable to remove the item from
- * @param k the key to search for - does not claim ownership
- * @return the value associated with the key, or NULL if none found
- */
-
-void * /* returns value */
-hashtable_remove(struct hashtable *h, void *k);
-
-#define DEFINE_HASHTABLE_REMOVE(fnname, keytype, valuetype) \
-valuetype * fnname (struct hashtable *h, keytype *k) \
-{ \
- return (valuetype *) (hashtable_remove(h,k)); \
-}
-
-
-/*****************************************************************************
- * hashtable_count
-
- * @name hashtable_count
- * @param h the hashtable
- * @return the number of items stored in the hashtable
- */
-unsigned int
-hashtable_count(struct hashtable *h);
-
-
-/*****************************************************************************
- * hashtable_destroy
-
- * @name hashtable_destroy
- * @param h the hashtable
- * @param free_values whether to call 'free' on the remaining values
- */
-
-void
-hashtable_destroy(struct hashtable *h, int free_values);
-
-#endif /* __HASHTABLE_CWC22_H__ */
-
-/*
- * Copyright (c) 2002, Christopher Clark
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * * Neither the name of the original author; nor the names of any contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
- * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/