hash_method.c
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上传日期:2022-05-23
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文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1999-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: hash_method.c,v 11.12 2002/03/27 04:32:12 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #endif
- #include "db_int.h"
- #include "dbinc/db_page.h"
- #include "dbinc/hash.h"
- static int __ham_set_h_ffactor __P((DB *, u_int32_t));
- static int __ham_set_h_hash
- __P((DB *, u_int32_t(*)(DB *, const void *, u_int32_t)));
- static int __ham_set_h_nelem __P((DB *, u_int32_t));
- /*
- * __ham_db_create --
- * Hash specific initialization of the DB structure.
- *
- * PUBLIC: int __ham_db_create __P((DB *));
- */
- int
- __ham_db_create(dbp)
- DB *dbp;
- {
- HASH *hashp;
- int ret;
- if ((ret = __os_malloc(dbp->dbenv,
- sizeof(HASH), &dbp->h_internal)) != 0)
- return (ret);
- hashp = dbp->h_internal;
- hashp->h_nelem = 0; /* Defaults. */
- hashp->h_ffactor = 0;
- hashp->h_hash = NULL;
- dbp->set_h_ffactor = __ham_set_h_ffactor;
- dbp->set_h_hash = __ham_set_h_hash;
- dbp->set_h_nelem = __ham_set_h_nelem;
- return (0);
- }
- /*
- * PUBLIC: int __ham_db_close __P((DB *));
- */
- int
- __ham_db_close(dbp)
- DB *dbp;
- {
- if (dbp->h_internal == NULL)
- return (0);
- __os_free(dbp->dbenv, dbp->h_internal);
- dbp->h_internal = NULL;
- return (0);
- }
- /*
- * __ham_set_h_ffactor --
- * Set the fill factor.
- */
- static int
- __ham_set_h_ffactor(dbp, h_ffactor)
- DB *dbp;
- u_int32_t h_ffactor;
- {
- HASH *hashp;
- DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_ffactor");
- DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);
- hashp = dbp->h_internal;
- hashp->h_ffactor = h_ffactor;
- return (0);
- }
- /*
- * __ham_set_h_hash --
- * Set the hash function.
- */
- static int
- __ham_set_h_hash(dbp, func)
- DB *dbp;
- u_int32_t (*func) __P((DB *, const void *, u_int32_t));
- {
- HASH *hashp;
- DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_hash");
- DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);
- hashp = dbp->h_internal;
- hashp->h_hash = func;
- return (0);
- }
- /*
- * __ham_set_h_nelem --
- * Set the table size.
- */
- static int
- __ham_set_h_nelem(dbp, h_nelem)
- DB *dbp;
- u_int32_t h_nelem;
- {
- HASH *hashp;
- DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_nelem");
- DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);
- hashp = dbp->h_internal;
- hashp->h_nelem = h_nelem;
- return (0);
- }