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Diffstat (limited to 'dbm/sdbm/sdbm_private.h')
| -rw-r--r-- | dbm/sdbm/sdbm_private.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/dbm/sdbm/sdbm_private.h b/dbm/sdbm/sdbm_private.h new file mode 100644 index 0000000..f5d1ae0 --- /dev/null +++ b/dbm/sdbm/sdbm_private.h @@ -0,0 +1,84 @@ +/* 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 */ |