/* $NetBSD: citrus_db.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $ */ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c)2003 Citrus Project, * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include #include #include #include #include #include #include #include #include #include "citrus_namespace.h" #include "citrus_bcs.h" #include "citrus_region.h" #include "citrus_memstream.h" #include "citrus_mmap.h" #include "citrus_db.h" #include "citrus_db_factory.h" #include "citrus_db_file.h" struct _citrus_db { struct _region db_region; _citrus_db_hash_func_t db_hashfunc; void *db_hashfunc_closure; }; int _citrus_db_open(struct _citrus_db **rdb, struct _region *r, const char *magic, _citrus_db_hash_func_t hashfunc, void *hashfunc_closure) { struct _citrus_db *db; struct _citrus_db_header_x *dhx; struct _memstream ms; _memstream_bind(&ms, r); /* sanity check */ dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx)); if (dhx == NULL) return (EFTYPE); if (strncmp(dhx->dhx_magic, magic, _CITRUS_DB_MAGIC_SIZE) != 0) return (EFTYPE); if (_memstream_seek(&ms, be32toh(dhx->dhx_entry_offset), SEEK_SET)) return (EFTYPE); if (be32toh(dhx->dhx_num_entries)*_CITRUS_DB_ENTRY_SIZE > _memstream_remainder(&ms)) return (EFTYPE); db = malloc(sizeof(*db)); if (db == NULL) return (errno); db->db_region = *r; db->db_hashfunc = hashfunc; db->db_hashfunc_closure = hashfunc_closure; *rdb = db; return (0); } void _citrus_db_close(struct _citrus_db *db) { free(db); } int _citrus_db_lookup(struct _citrus_db *db, struct _citrus_region *key, struct _citrus_region *data, struct _citrus_db_locator *dl) { struct _citrus_db_entry_x *dex; struct _citrus_db_header_x *dhx; struct _citrus_region r; struct _memstream ms; uint32_t hashval, num_entries; size_t offset; _memstream_bind(&ms, &db->db_region); dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx)); num_entries = be32toh(dhx->dhx_num_entries); if (num_entries == 0) return (ENOENT); if (dl != NULL && dl->dl_offset>0) { hashval = dl->dl_hashval; offset = dl->dl_offset; if (offset >= _region_size(&db->db_region)) return (ENOENT); } else { hashval = db->db_hashfunc(key)%num_entries; offset = be32toh(dhx->dhx_entry_offset) + hashval * _CITRUS_DB_ENTRY_SIZE; if (dl) dl->dl_hashval = hashval; } do { /* seek to the next entry */ if (_citrus_memory_stream_seek(&ms, offset, SEEK_SET)) return (EFTYPE); /* get the entry record */ dex = _memstream_getregion(&ms, NULL, _CITRUS_DB_ENTRY_SIZE); if (dex == NULL) return (EFTYPE); /* jump to next entry having the same hash value. */ offset = be32toh(dex->dex_next_offset); /* save the current position */ if (dl) { dl->dl_offset = offset; if (offset == 0) dl->dl_offset = _region_size(&db->db_region); } /* compare hash value. */ if (be32toh(dex->dex_hash_value) != hashval) /* not found */ break; /* compare key length */ if (be32toh(dex->dex_key_size) == _region_size(key)) { /* seek to the head of the key. */ if (_memstream_seek(&ms, be32toh(dex->dex_key_offset), SEEK_SET)) return (EFTYPE); /* get the region of the key */ if (_memstream_getregion(&ms, &r, _region_size(key)) == NULL) return (EFTYPE); /* compare key byte stream */ if (memcmp(_region_head(&r), _region_head(key), _region_size(key)) == 0) { /* match */ if (_memstream_seek( &ms, be32toh(dex->dex_data_offset), SEEK_SET)) return (EFTYPE); if (_memstream_getregion( &ms, data, be32toh(dex->dex_data_size)) == NULL) return (EFTYPE); return (0); } } } while (offset != 0); return (ENOENT); } int _citrus_db_lookup_by_string(struct _citrus_db *db, const char *key, struct _citrus_region *data, struct _citrus_db_locator *dl) { struct _region r; _region_init(&r, __DECONST(void *, key), strlen(key)); return (_citrus_db_lookup(db, &r, data, dl)); } int _citrus_db_lookup8_by_string(struct _citrus_db *db, const char *key, uint8_t *rval, struct _citrus_db_locator *dl) { struct _region r; int ret; ret = _citrus_db_lookup_by_string(db, key, &r, dl); if (ret) return (ret); if (_region_size(&r) != 1) return (EFTYPE); if (rval) memcpy(rval, _region_head(&r), 1); return (0); } int _citrus_db_lookup16_by_string(struct _citrus_db *db, const char *key, uint16_t *rval, struct _citrus_db_locator *dl) { struct _region r; int ret; uint16_t val; ret = _citrus_db_lookup_by_string(db, key, &r, dl); if (ret) return (ret); if (_region_size(&r) != 2) return (EFTYPE); if (rval) { memcpy(&val, _region_head(&r), 2); *rval = be16toh(val); } return (0); } int _citrus_db_lookup32_by_string(struct _citrus_db *db, const char *key, uint32_t *rval, struct _citrus_db_locator *dl) { struct _region r; uint32_t val; int ret; ret = _citrus_db_lookup_by_string(db, key, &r, dl); if (ret) return (ret); if (_region_size(&r) != 4) return (EFTYPE); if (rval) { memcpy(&val, _region_head(&r), 4); *rval = be32toh(val); } return (0); } int _citrus_db_lookup_string_by_string(struct _citrus_db *db, const char *key, const char **rdata, struct _citrus_db_locator *dl) { struct _region r; int ret; ret = _citrus_db_lookup_by_string(db, key, &r, dl); if (ret) return (ret); /* check whether the string is null terminated */ if (_region_size(&r) == 0) return (EFTYPE); if (*((const char*)_region_head(&r)+_region_size(&r)-1) != '\0') return (EFTYPE); if (rdata) *rdata = _region_head(&r); return (0); } int _citrus_db_get_number_of_entries(struct _citrus_db *db) { struct _citrus_db_header_x *dhx; struct _memstream ms; _memstream_bind(&ms, &db->db_region); dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx)); return ((int)be32toh(dhx->dhx_num_entries)); } int _citrus_db_get_entry(struct _citrus_db *db, int idx, struct _region *key, struct _region *data) { struct _citrus_db_entry_x *dex; struct _citrus_db_header_x *dhx; struct _memstream ms; uint32_t num_entries; size_t offset; _memstream_bind(&ms, &db->db_region); dhx = _memstream_getregion(&ms, NULL, sizeof(*dhx)); num_entries = be32toh(dhx->dhx_num_entries); if (idx < 0 || (uint32_t)idx >= num_entries) return (EINVAL); /* seek to the next entry */ offset = be32toh(dhx->dhx_entry_offset) + idx * _CITRUS_DB_ENTRY_SIZE; if (_citrus_memory_stream_seek(&ms, offset, SEEK_SET)) return (EFTYPE); /* get the entry record */ dex = _memstream_getregion(&ms, NULL, _CITRUS_DB_ENTRY_SIZE); if (dex == NULL) return (EFTYPE); /* seek to the head of the key. */ if (_memstream_seek(&ms, be32toh(dex->dex_key_offset), SEEK_SET)) return (EFTYPE); /* get the region of the key. */ if (_memstream_getregion(&ms, key, be32toh(dex->dex_key_size))==NULL) return (EFTYPE); /* seek to the head of the data. */ if (_memstream_seek(&ms, be32toh(dex->dex_data_offset), SEEK_SET)) return (EFTYPE); /* get the region of the data. */ if (_memstream_getregion(&ms, data, be32toh(dex->dex_data_size))==NULL) return (EFTYPE); return (0); }