| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 */ |