Apache Portable Runtime
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sdbm_private.h
1/* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/*
18 * sdbm - ndbm work-alike hashed database library
19 * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978).
20 * author: oz@nexus.yorku.ca
21 */
22
23#ifndef SDBM_PRIVATE_H
24#define SDBM_PRIVATE_H
25
26#include "apr.h"
27#include "apr_pools.h"
28#include "apr_file_io.h"
29#include "apr_errno.h" /* for apr_status_t */
30
31#if 0
32/* if the block/page size is increased, it breaks perl apr_sdbm_t compatibility */
33#define DBLKSIZ 16384
34#define PBLKSIZ 8192
35#define PAIRMAX 8008 /* arbitrary on PBLKSIZ-N */
36#else
37#define DBLKSIZ 4096
38#define PBLKSIZ 1024
39#define PAIRMAX 1008 /* arbitrary on PBLKSIZ-N */
40#endif
41#define SPLTMAX 10 /* maximum allowed splits */
42
43/* for apr_sdbm_t.flags */
44#define SDBM_RDONLY 0x1 /* data base open read-only */
45#define SDBM_SHARED 0x2 /* data base open for sharing */
46#define SDBM_SHARED_LOCK 0x4 /* data base locked for shared read */
47#define SDBM_EXCLUSIVE_LOCK 0x8 /* data base locked for write */
48
49struct apr_sdbm_t {
50 apr_pool_t *pool;
51 apr_file_t *dirf; /* directory file descriptor */
52 apr_file_t *pagf; /* page file descriptor */
53 apr_int32_t flags; /* status/error flags, see below */
54 long maxbno; /* size of dirfile in bits */
55 long curbit; /* current bit number */
56 long hmask; /* current hash mask */
57 long blkptr; /* current block for nextkey */
58 int keyptr; /* current key for nextkey */
59 long blkno; /* current page to read/write */
60 long pagbno; /* current page in pagbuf */
61 char pagbuf[PBLKSIZ]; /* page file block buffer */
62 long dirbno; /* current block in dirbuf */
63 char dirbuf[DBLKSIZ]; /* directory file block buffer */
64 int lckcnt; /* number of calls to sdbm_lock */
65};
66
67
68#define sdbm_hash apu__sdbm_hash
69#define sdbm_nullitem apu__sdbm_nullitem
70
71extern const apr_sdbm_datum_t sdbm_nullitem;
72
73long sdbm_hash(const char *str, int len);
74
75/*
76 * zero the cache
77 */
78#define SDBM_INVALIDATE_CACHE(db, finfo) \
79 do { db->dirbno = (!finfo.size) ? 0 : -1; \
80 db->pagbno = -1; \
81 db->maxbno = (long)(finfo.size * BYTESIZ); \
82 } while (0);
83
84#endif /* SDBM_PRIVATE_H */
APR Platform Definitions.
APR Error Codes.
APR File I/O Handling.
APR memory allocation.
struct apr_file_t apr_file_t
Definition apr_file_io.h:195
struct apr_pool_t apr_pool_t
Definition apr_pools.h:60
Definition apr_sdbm.h:49
Definition sdbm_private.h:49