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