341 lines
8.5 KiB
C
341 lines
8.5 KiB
C
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/* $NetBSD: citrus_db.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $ */
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/*-
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* Copyright (c)2003 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: citrus_db.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/types.h>
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#include "citrus_namespace.h"
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#include "citrus_bcs.h"
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#include "citrus_region.h"
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#include "citrus_memstream.h"
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#include "citrus_mmap.h"
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#include "citrus_db.h"
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#include "citrus_db_file.h"
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struct _citrus_db {
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/* private */
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struct _region db_region;
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uint32_t (*db_hashfunc)(void *, struct _citrus_region *);
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void *db_hashfunc_closure;
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};
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int
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_citrus_db_open(struct _citrus_db **rdb, struct _region *r, const char *magic,
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uint32_t (*hashfunc)(void *, struct _citrus_region *),
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void *hashfunc_closure)
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{
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struct _memstream ms;
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struct _citrus_db *db;
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struct _citrus_db_header_x *dhx;
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_memstream_bind(&ms, r);
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/* sanity check */
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dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx));
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if (dhx == NULL)
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return EFTYPE;
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if (strncmp(dhx->dhx_magic, magic, _CITRUS_DB_MAGIC_SIZE) != 0)
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return EFTYPE;
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if (_memstream_seek(&ms, be32toh(dhx->dhx_entry_offset), SEEK_SET))
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return EFTYPE;
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if (be32toh(dhx->dhx_num_entries)*_CITRUS_DB_ENTRY_SIZE >
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_memstream_remainder(&ms))
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return EFTYPE;
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db = malloc(sizeof(*db));
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if (db==NULL)
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return errno;
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db->db_region = *r;
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db->db_hashfunc = hashfunc;
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db->db_hashfunc_closure = hashfunc_closure;
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*rdb = db;
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return 0;
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}
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void
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_citrus_db_close(struct _citrus_db *db)
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{
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free(db);
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}
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int
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_citrus_db_lookup(struct _citrus_db *db, struct _citrus_region *key,
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struct _citrus_region *data, struct _citrus_db_locator *dl)
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{
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uint32_t hashval, num_entries;
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size_t offset;
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struct _memstream ms;
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struct _citrus_db_header_x *dhx;
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struct _citrus_db_entry_x *dex;
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struct _citrus_region r;
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_memstream_bind(&ms, &db->db_region);
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dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx));
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_DIAGASSERT(dhx);
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num_entries = be32toh(dhx->dhx_num_entries);
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if (num_entries == 0)
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return ENOENT;
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if (dl != NULL && dl->dl_offset>0) {
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hashval = dl->dl_hashval;
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offset = dl->dl_offset;
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if (offset >= _region_size(&db->db_region))
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return ENOENT;
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} else {
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hashval =
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db->db_hashfunc(db->db_hashfunc_closure, key)%num_entries;
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offset =
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be32toh(dhx->dhx_entry_offset) +
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hashval * _CITRUS_DB_ENTRY_SIZE;
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if (dl)
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dl->dl_hashval = hashval;
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}
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do {
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/* seek to the next entry */
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if (_citrus_memory_stream_seek(&ms, offset, SEEK_SET))
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return EFTYPE;
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/* get the entry record */
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dex = _memstream_getregion(&ms, NULL, _CITRUS_DB_ENTRY_SIZE);
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if (dex == NULL)
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return EFTYPE;
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/* jump to next entry having the same hash value. */
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offset = be32toh(dex->dex_next_offset);
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/* save the current position */
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if (dl) {
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dl->dl_offset = offset;
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if (offset==0)
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dl->dl_offset = _region_size(&db->db_region);
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}
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/* compare hash value. */
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if (be32toh(dex->dex_hash_value) != hashval)
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/* not found */
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break;
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/* compare key length */
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if (be32toh(dex->dex_key_size) == _region_size(key)) {
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/* seek to the head of the key. */
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if (_memstream_seek(&ms, be32toh(dex->dex_key_offset),
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SEEK_SET))
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return EFTYPE;
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/* get the region of the key */
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if (_memstream_getregion(&ms, &r,
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_region_size(key)) == NULL)
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return EFTYPE;
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/* compare key byte stream */
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if (memcmp(_region_head(&r), _region_head(key),
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_region_size(key)) == 0) {
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/* match */
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if (_memstream_seek(
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&ms, be32toh(dex->dex_data_offset),
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SEEK_SET))
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return EFTYPE;
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if (_memstream_getregion(
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&ms, data,
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be32toh(dex->dex_data_size)) == NULL)
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return EFTYPE;
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return 0;
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}
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}
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} while (offset != 0);
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return ENOENT;
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}
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int
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_citrus_db_lookup_by_string(struct _citrus_db *db, const char *key,
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struct _citrus_region *data,
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struct _citrus_db_locator *dl)
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{
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struct _region r;
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_region_init(&r, __UNCONST(key), strlen(key));
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return _citrus_db_lookup(db, &r, data, dl);
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}
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int
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_citrus_db_lookup8_by_string(struct _citrus_db *db, const char *key,
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uint8_t *rval, struct _citrus_db_locator *dl)
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{
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int ret;
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struct _region r;
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ret = _citrus_db_lookup_by_string(db, key, &r, dl);
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if (ret)
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return ret;
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if (_region_size(&r) != 1)
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return EFTYPE;
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if (rval)
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memcpy(rval, _region_head(&r), 1);
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return 0;
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}
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int
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_citrus_db_lookup16_by_string(struct _citrus_db *db, const char *key,
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uint16_t *rval, struct _citrus_db_locator *dl)
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{
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int ret;
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struct _region r;
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uint16_t val;
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ret = _citrus_db_lookup_by_string(db, key, &r, dl);
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if (ret)
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return ret;
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if (_region_size(&r) != 2)
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return EFTYPE;
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if (rval) {
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memcpy(&val, _region_head(&r), 2);
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*rval = be16toh(val);
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}
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return 0;
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}
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int
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_citrus_db_lookup32_by_string(struct _citrus_db *db, const char *key,
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uint32_t *rval, struct _citrus_db_locator *dl)
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{
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int ret;
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struct _region r;
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uint32_t val;
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ret = _citrus_db_lookup_by_string(db, key, &r, dl);
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if (ret)
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return ret;
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if (_region_size(&r) != 4)
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return EFTYPE;
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if (rval) {
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memcpy(&val, _region_head(&r), 4);
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*rval = be32toh(val);
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}
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return 0;
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}
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int
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_citrus_db_lookup_string_by_string(struct _citrus_db *db, const char *key,
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const char **rdata,
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struct _citrus_db_locator *dl)
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{
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int ret;
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struct _region r;
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ret = _citrus_db_lookup_by_string(db, key, &r, dl);
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if (ret)
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return ret;
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/* check whether the string is null terminated */
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if (_region_size(&r) == 0)
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return EFTYPE;
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if (*((const char*)_region_head(&r)+_region_size(&r)-1) != '\0')
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return EFTYPE;
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if (rdata)
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*rdata = _region_head(&r);
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return 0;
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}
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int
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_citrus_db_get_number_of_entries(struct _citrus_db *db)
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{
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struct _memstream ms;
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struct _citrus_db_header_x *dhx;
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_memstream_bind(&ms, &db->db_region);
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dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx));
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_DIAGASSERT(dhx);
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return (int)be32toh(dhx->dhx_num_entries);
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}
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int
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_citrus_db_get_entry(struct _citrus_db *db, int idx,
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struct _region *key, struct _region *data)
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{
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uint32_t num_entries;
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size_t offset;
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struct _memstream ms;
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struct _citrus_db_header_x *dhx;
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struct _citrus_db_entry_x *dex;
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_memstream_bind(&ms, &db->db_region);
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dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx));
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_DIAGASSERT(dhx);
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num_entries = be32toh(dhx->dhx_num_entries);
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if (idx < 0 || (uint32_t)idx >= num_entries)
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return EINVAL;
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/* seek to the next entry */
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offset = be32toh(dhx->dhx_entry_offset) + idx * _CITRUS_DB_ENTRY_SIZE;
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if (_citrus_memory_stream_seek(&ms, offset, SEEK_SET))
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return EFTYPE;
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/* get the entry record */
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dex = _memstream_getregion(&ms, NULL, _CITRUS_DB_ENTRY_SIZE);
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if (dex == NULL)
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return EFTYPE;
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/* seek to the head of the key. */
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if (_memstream_seek(&ms, be32toh(dex->dex_key_offset), SEEK_SET))
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return EFTYPE;
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/* get the region of the key. */
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if (_memstream_getregion(&ms, key, be32toh(dex->dex_key_size))==NULL)
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return EFTYPE;
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/* seek to the head of the data. */
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if (_memstream_seek(&ms, be32toh(dex->dex_data_offset), SEEK_SET))
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return EFTYPE;
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/* get the region of the data. */
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if (_memstream_getregion(&ms, data, be32toh(dex->dex_data_size))==NULL)
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return EFTYPE;
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return 0;
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}
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