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140 lines
5.2 KiB
C
140 lines
5.2 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef plhash_h___
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#define plhash_h___
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/*
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* API to portable hash table code.
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*/
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#include <stdio.h>
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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typedef struct PLHashEntry PLHashEntry;
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typedef struct PLHashTable PLHashTable;
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typedef PRUint32 PLHashNumber;
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#define PL_HASH_BITS 32 /* Number of bits in PLHashNumber */
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typedef PLHashNumber (PR_CALLBACK *PLHashFunction)(const void *key);
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typedef PRIntn (PR_CALLBACK *PLHashComparator)(const void *v1, const void *v2);
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#if defined(XP_OS2_VACPP) && defined(VACPP_FLIP) /* for nsSpaceManager.cpp */
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PR_END_EXTERN_C /* and nsHTMLDocument.cpp */
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#endif
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typedef PRIntn (PR_CALLBACK *PLHashEnumerator)(PLHashEntry *he, PRIntn i, void *arg);
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#if defined(XP_OS2_VACPP) && defined(VACPP_FLIP)
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PR_BEGIN_EXTERN_C
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#endif
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/* Flag bits in PLHashEnumerator's return value */
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#define HT_ENUMERATE_NEXT 0 /* continue enumerating entries */
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#define HT_ENUMERATE_STOP 1 /* stop enumerating entries */
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#define HT_ENUMERATE_REMOVE 2 /* remove and free the current entry */
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#define HT_ENUMERATE_UNHASH 4 /* just unhash the current entry */
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typedef struct PLHashAllocOps {
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void * (PR_CALLBACK *allocTable)(void *pool, PRSize size);
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void (PR_CALLBACK *freeTable)(void *pool, void *item);
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PLHashEntry * (PR_CALLBACK *allocEntry)(void *pool, const void *key);
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void (PR_CALLBACK *freeEntry)(void *pool, PLHashEntry *he, PRUintn flag);
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} PLHashAllocOps;
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#define HT_FREE_VALUE 0 /* just free the entry's value */
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#define HT_FREE_ENTRY 1 /* free value and entire entry */
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struct PLHashEntry {
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PLHashEntry *next; /* hash chain linkage */
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PLHashNumber keyHash; /* key hash function result */
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const void *key; /* ptr to opaque key */
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void *value; /* ptr to opaque value */
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};
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struct PLHashTable {
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PLHashEntry **buckets; /* vector of hash buckets */
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PRUint32 nentries; /* number of entries in table */
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PRUint32 shift; /* multiplicative hash shift */
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PLHashFunction keyHash; /* key hash function */
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PLHashComparator keyCompare; /* key comparison function */
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PLHashComparator valueCompare; /* value comparison function */
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const PLHashAllocOps *allocOps; /* allocation operations */
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void *allocPriv; /* allocation private data */
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#ifdef HASHMETER
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PRUint32 nlookups; /* total number of lookups */
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PRUint32 nsteps; /* number of hash chains traversed */
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PRUint32 ngrows; /* number of table expansions */
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PRUint32 nshrinks; /* number of table contractions */
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#endif
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};
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/*
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* Create a new hash table.
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* If allocOps is null, use default allocator ops built on top of malloc().
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*/
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PR_EXTERN(PLHashTable *)
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PL_NewHashTable(PRUint32 numBuckets, PLHashFunction keyHash,
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PLHashComparator keyCompare, PLHashComparator valueCompare,
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const PLHashAllocOps *allocOps, void *allocPriv);
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PR_EXTERN(void)
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PL_HashTableDestroy(PLHashTable *ht);
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/* Higher level access methods */
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PR_EXTERN(PLHashEntry *)
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PL_HashTableAdd(PLHashTable *ht, const void *key, void *value);
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PR_EXTERN(PRBool)
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PL_HashTableRemove(PLHashTable *ht, const void *key);
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PR_EXTERN(void *)
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PL_HashTableLookup(PLHashTable *ht, const void *key);
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PR_EXTERN(PRIntn)
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PL_HashTableEnumerateEntries(PLHashTable *ht, PLHashEnumerator f, void *arg);
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/* General-purpose C string hash function. */
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PR_EXTERN(PLHashNumber)
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PL_HashString(const void *key);
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/* Compare strings using strcmp(), return true if equal. */
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PR_EXTERN(PRIntn)
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PL_CompareStrings(const void *v1, const void *v2);
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/* Stub function just returns v1 == v2 */
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PR_EXTERN(PRIntn)
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PL_CompareValues(const void *v1, const void *v2);
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/* Low level access methods */
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PR_EXTERN(PLHashEntry **)
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PL_HashTableRawLookup(PLHashTable *ht, PLHashNumber keyHash, const void *key);
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PR_EXTERN(PLHashEntry *)
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PL_HashTableRawAdd(PLHashTable *ht, PLHashEntry **hep, PLHashNumber keyHash,
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const void *key, void *value);
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PR_EXTERN(void)
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PL_HashTableRawRemove(PLHashTable *ht, PLHashEntry **hep, PLHashEntry *he);
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/* This can be trivially implemented using PL_HashTableEnumerateEntries. */
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PR_EXTERN(PRIntn)
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PL_HashTableDump(PLHashTable *ht, PLHashEnumerator dump, FILE *fp);
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PR_END_EXTERN_C
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#endif /* plhash_h___ */
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