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 49 struct 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 71 extern const apr_sdbm_datum_t sdbm_nullitem; 72 73 long 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 */ 85