00001 /* Licensed to the Apache Software Foundation (ASF) under one or more 00002 * contributor license agreements. See the NOTICE file distributed with 00003 * this work for additional information regarding copyright ownership. 00004 * The ASF licenses this file to You under the Apache License, Version 2.0 00005 * (the "License"); you may not use this file except in compliance with 00006 * the License. You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00017 /* 00018 * sdbm - ndbm work-alike hashed database library 00019 * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978). 00020 * author: oz@nexus.yorku.ca 00021 */ 00022 00023 #ifndef SDBM_PRIVATE_H 00024 #define SDBM_PRIVATE_H 00025 00026 #include "apr.h" 00027 #include "apr_pools.h" 00028 #include "apr_file_io.h" 00029 #include "apr_errno.h" /* for apr_status_t */ 00030 00031 #if 0 00032 /* if the block/page size is increased, it breaks perl apr_sdbm_t compatibility */ 00033 #define DBLKSIZ 16384 00034 #define PBLKSIZ 8192 00035 #define PAIRMAX 8008 /* arbitrary on PBLKSIZ-N */ 00036 #else 00037 #define DBLKSIZ 4096 00038 #define PBLKSIZ 1024 00039 #define PAIRMAX 1008 /* arbitrary on PBLKSIZ-N */ 00040 #endif 00041 #define SPLTMAX 10 /* maximum allowed splits */ 00042 00043 /* for apr_sdbm_t.flags */ 00044 #define SDBM_RDONLY 0x1 /* data base open read-only */ 00045 #define SDBM_SHARED 0x2 /* data base open for sharing */ 00046 #define SDBM_SHARED_LOCK 0x4 /* data base locked for shared read */ 00047 #define SDBM_EXCLUSIVE_LOCK 0x8 /* data base locked for write */ 00048 00049 struct apr_sdbm_t { 00050 apr_pool_t *pool; 00051 apr_file_t *dirf; /* directory file descriptor */ 00052 apr_file_t *pagf; /* page file descriptor */ 00053 apr_int32_t flags; /* status/error flags, see below */ 00054 long maxbno; /* size of dirfile in bits */ 00055 long curbit; /* current bit number */ 00056 long hmask; /* current hash mask */ 00057 long blkptr; /* current block for nextkey */ 00058 int keyptr; /* current key for nextkey */ 00059 long blkno; /* current page to read/write */ 00060 long pagbno; /* current page in pagbuf */ 00061 char pagbuf[PBLKSIZ]; /* page file block buffer */ 00062 long dirbno; /* current block in dirbuf */ 00063 char dirbuf[DBLKSIZ]; /* directory file block buffer */ 00064 int lckcnt; /* number of calls to sdbm_lock */ 00065 }; 00066 00067 00068 #define sdbm_hash apu__sdbm_hash 00069 #define sdbm_nullitem apu__sdbm_nullitem 00070 00071 extern const apr_sdbm_datum_t sdbm_nullitem; 00072 00073 long sdbm_hash(const char *str, int len); 00074 00075 /* 00076 * zero the cache 00077 */ 00078 #define SDBM_INVALIDATE_CACHE(db, finfo) \ 00079 do { db->dirbno = (!finfo.size) ? 0 : -1; \ 00080 db->pagbno = -1; \ 00081 db->maxbno = (long)(finfo.size * BYTESIZ); \ 00082 } while (0); 00083 00084 #endif /* SDBM_PRIVATE_H */
1.5.6