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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* sdbm - ndbm work-alike hashed database library
* based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
* author: oz@nexus.yorku.ca
*/
#ifndef SDBM_PRIVATE_H
#define SDBM_PRIVATE_H
#include "apr.h"
#include "apr_pools.h"
#include "apr_file_io.h"
#include "apr_errno.h" /* for apr_status_t */
#if 0
/* if the block/page size is increased, it breaks perl apr_sdbm_t compatibility */
#define DBLKSIZ 16384
#define PBLKSIZ 8192
#define PAIRMAX 8008 /* arbitrary on PBLKSIZ-N */
#else
#define DBLKSIZ 4096
#define PBLKSIZ 1024
#define PAIRMAX 1008 /* arbitrary on PBLKSIZ-N */
#endif
#define SPLTMAX 10 /* maximum allowed splits */
/* for apr_sdbm_t.flags */
#define SDBM_RDONLY 0x1 /* data base open read-only */
#define SDBM_SHARED 0x2 /* data base open for sharing */
#define SDBM_SHARED_LOCK 0x4 /* data base locked for shared read */
#define SDBM_EXCLUSIVE_LOCK 0x8 /* data base locked for write */
struct apr_sdbm_t {
apr_pool_t *pool;
apr_file_t *dirf; /* directory file descriptor */
apr_file_t *pagf; /* page file descriptor */
apr_int32_t flags; /* status/error flags, see below */
long maxbno; /* size of dirfile in bits */
long curbit; /* current bit number */
long hmask; /* current hash mask */
long blkptr; /* current block for nextkey */
int keyptr; /* current key for nextkey */
long blkno; /* current page to read/write */
long pagbno; /* current page in pagbuf */
char pagbuf[PBLKSIZ]; /* page file block buffer */
long dirbno; /* current block in dirbuf */
char dirbuf[DBLKSIZ]; /* directory file block buffer */
int lckcnt; /* number of calls to sdbm_lock */
};
#define sdbm_hash apu__sdbm_hash
#define sdbm_nullitem apu__sdbm_nullitem
extern const apr_sdbm_datum_t sdbm_nullitem;
long sdbm_hash(const char *str, int len);
/*
* zero the cache
*/
#define SDBM_INVALIDATE_CACHE(db, finfo) \
do { db->dirbno = (!finfo.size) ? 0 : -1; \
db->pagbno = -1; \
db->maxbno = (long)(finfo.size * BYTESIZ); \
} while (0);
#endif /* SDBM_PRIVATE_H */
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