mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 14:45:29 +00:00
9e1116af2d
the newsgroup name. if the name is too long for the native file system, use the hash function to come up with a new name. move that has code out of xp_hash.c and into newsSummarySpec.cpp in 4.x, this was the only place it was used anyways. fix my debugging printf. re-arrange addressbook makefiles in mailnews/makefiles so that people who use obj-dir can build.
153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
#ifndef _XP_HASH_
|
|
#define _XP_HASH_
|
|
|
|
#include "xp_list.h"
|
|
|
|
XP_BEGIN_PROTOS
|
|
|
|
typedef uint32 (*XP_HashingFunction) (const void *ele);
|
|
|
|
/* A hash compare function is like strcmp - it should return negative, zero,
|
|
or positive depending on the ordering and equality of its arguments.
|
|
*/
|
|
typedef int (*XP_HashCompFunction) (const void *ele1, const void *ele2);
|
|
|
|
/* get hash number from a string */
|
|
extern uint32 XP_StringHash (const void *xv);
|
|
|
|
/* Hash Tables.
|
|
*/
|
|
|
|
typedef struct xp_HashTable *XP_HashTable; /* opaque */
|
|
|
|
typedef XP_Bool (*XP_HashTableMapper) (XP_HashTable table,
|
|
const void *key, void *value,
|
|
void *closure);
|
|
|
|
/* Create a new, empty hash table object.
|
|
SIZE should be your best guess at how many items will go into this
|
|
table; if SIZE is too small, that's ok, but there will be a small
|
|
performance hit. The size need not be prime.
|
|
*/
|
|
extern XP_HashTable XP_HashTableNew (uint32 size,
|
|
XP_HashingFunction hash_fn,
|
|
XP_HashCompFunction compare_fn);
|
|
|
|
/* Clear and free the hash table.
|
|
*/
|
|
extern void XP_HashTableDestroy (XP_HashTable table);
|
|
|
|
/* Remove all entries from the hash table.
|
|
*/
|
|
extern void XP_Clrhash (XP_HashTable table);
|
|
|
|
/* Add an association between KEY and VALUE to the hash table.
|
|
An existing association will be replaced.
|
|
(Note that 0 is a legal value.)
|
|
This can only fail if we run out of memory.
|
|
*/
|
|
extern int XP_Puthash (XP_HashTable table, const void *key, void *value);
|
|
|
|
/* Remove the for KEY in the table, if it exists.
|
|
Returns FALSE if the key wasn't in the table.
|
|
*/
|
|
extern XP_Bool XP_Remhash (XP_HashTable table, const void *key);
|
|
|
|
/* Looks up KEY in the table and returns the corresponding value.
|
|
If KEY is not in the table, `default_value' will be returned instead.
|
|
(This is necessary since 0 is a valid value with which a key can be
|
|
associated.)
|
|
*/
|
|
extern void *XP_Gethash (XP_HashTable table, const void *key,
|
|
void *default_value);
|
|
|
|
/* Apply a function to each pair of elements in the hash table.
|
|
If that function returns FALSE, then the mapping stops prematurely.
|
|
The mapping function may call XP_Remhash() on the *current* key, but
|
|
not on any other key in this table. It also may not clear or destroy
|
|
the table.
|
|
*/
|
|
extern void XP_Maphash (XP_HashTable table, XP_HashTableMapper mapper,
|
|
void *closure);
|
|
|
|
/* Apply a function to each pair of elements in the hash table.
|
|
After calling the function, that pair will be removed from the table.
|
|
If the function returns FALSE, then the mapping stops prematurely.
|
|
Any items which were not mapped over will still remain in the table,
|
|
but those items which were mapped over will have been freed.
|
|
|
|
This could also be done by having the mapper function unconditionally
|
|
call XP_Remhash(), but using this function will be slightly more efficient.
|
|
*/
|
|
extern void XP_MapRemhash (XP_HashTable table, XP_HashTableMapper mapper,
|
|
void *closure);
|
|
|
|
|
|
/* ===========================================================================
|
|
Hash Lists, which aren't really hash tables.
|
|
*/
|
|
|
|
|
|
#define XP_HASH_DUPLICATE_OBJECT -99
|
|
|
|
typedef struct _XP_HashList {
|
|
XP_List **list;
|
|
int size;
|
|
XP_HashingFunction hash_func;
|
|
XP_HashCompFunction comp_func;
|
|
} XP_HashList;
|
|
|
|
/* create a hash list
|
|
*/
|
|
extern XP_HashList *
|
|
XP_HashListNew (int size, XP_HashingFunction hash_func, XP_HashCompFunction comp_func);
|
|
|
|
/* free a hash list
|
|
*/
|
|
extern void
|
|
XP_HashListDestroy (XP_HashList * hash_struct);
|
|
|
|
/* add an element to a hash list
|
|
*
|
|
* returns positive on success and negative on failure
|
|
*
|
|
* ERROR return codes
|
|
*
|
|
* XP_HASH_DUPLICATE_OBJECT
|
|
*/
|
|
extern int
|
|
XP_HashListAddObject (XP_HashList * hash_struct, void * new_ele);
|
|
|
|
/* finds an object by name in the hash list
|
|
*/
|
|
extern void *
|
|
XP_HashListFindObject (XP_HashList * hash_struct, void * ele);
|
|
|
|
/* removes an object by name from the hash list
|
|
* and returns the object if found
|
|
*/
|
|
extern void *
|
|
XP_HashListRemoveObject (XP_HashList * hash_struct, void * ele);
|
|
|
|
XP_END_PROTOS
|
|
|
|
#endif /* _XP_HASH_ */
|