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+/* 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 */