/*-
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)db.h 8.7 (Berkeley) 6/16/94
*/
#define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */
typedef uint32_t pgno_t;
#define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
typedef uint16_t indx_t;
#define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
typedef uint32_t recno_t;
/* Key/data structure -- a Data-Base Thang. */
typedef struct {
void *data; /* data */
size_t size; /* data length */
} DBT;
/*
* Recursive sequential scan.
*
* This avoids using sibling pointers, permitting (possibly partial)
* recovery from some kinds of btree corruption. Start a sequential
* scan as usual, but use R_RNEXT or R_RPREV to move forward or
* backward.
*
* This probably doesn't work with btrees that allow duplicate keys.
* Database modifications during the scan can also modify the parent
* page stack needed for correct functioning. Intermixing
* non-recursive traversal by using R_NEXT or R_PREV can also make the
* page stack inconsistent with the cursor and cause problems.
*/
#define R_RNEXT 128 /* seq (BTREE, RECNO) */
#define R_RPREV 129 /* seq (BTREE, RECNO) */
/*
* !!!
* The following flags are included in the dbopen(3) call as part of the
* open(2) flags. In order to avoid conflicts with the open flags, start
* at the top of the 16 or 32-bit number space and work our way down. If
* the open flags were significantly expanded in the future, it could be
* a problem. Wish I'd left another flags word in the dbopen call.
*
* !!!
* None of this stuff is implemented yet. The only reason that it's here
* is so that the access methods can skip copying the key/data pair when
* the DB_LOCK flag isn't set.
*/
#if UINT_MAX > 65535
#define DB_LOCK 0x20000000 /* Do locking. */
#define DB_SHMEM 0x40000000 /* Use shared memory. */
#define DB_TXN 0x80000000 /* Do transactions. */
#else
#define DB_LOCK 0x2000 /* Do locking. */
#define DB_SHMEM 0x4000 /* Use shared memory. */
#define DB_TXN 0x8000 /* Do transactions. */
#endif
/* Structure used to pass parameters to the btree routines. */
typedef struct {
#define R_DUP 0x01 /* duplicate keys */
unsigned long flags;
unsigned int cachesize; /* bytes to cache */
int maxkeypage; /* maximum keys per page */
int minkeypage; /* minimum keys per page */
unsigned int psize; /* page size */
int (*compare) /* comparison function */
(const DBT *, const DBT *);
size_t (*prefix) /* prefix function */
(const DBT *, const DBT *);
int lorder; /* byte order */
} BTREEINFO;
#define HASHMAGIC 0x061561
#define HASHVERSION 2
/* Structure used to pass parameters to the hashing routines. */
typedef struct {
unsigned int bsize; /* bucket size */
unsigned int ffactor; /* fill factor */
unsigned int nelem; /* number of elements */
unsigned int cachesize; /* bytes to cache */
uint32_t /* hash function */
(*hash)(const void *, size_t);
int lorder; /* byte order */
} HASHINFO;
/* Structure used to pass parameters to the record routines. */
typedef struct {
#define R_FIXEDLEN 0x01 /* fixed-length records */
#define R_NOKEY 0x02 /* key not required */
#define R_SNAPSHOT 0x04 /* snapshot the input */
unsigned long flags;
unsigned int cachesize; /* bytes to cache */
unsigned int psize; /* page size */
int lorder; /* byte order */
size_t reclen; /* record length (fixed-length records) */
uint8_t bval; /* delimiting byte (variable-length records */
char *bfname; /* btree file name */
} RECNOINFO;
