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Diffstat (limited to '')
| -rw-r--r-- | src/libknot/db/db_trie.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/libknot/db/db_trie.c b/src/libknot/db/db_trie.c new file mode 100644 index 0000000..d0fbb0c --- /dev/null +++ b/src/libknot/db/db_trie.c @@ -0,0 +1,178 @@ +/* Copyright (C) 2016 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <assert.h> + +#include "libknot/attribute.h" +#include "libknot/errcode.h" +#include "libknot/db/db_trie.h" +#include "contrib/qp-trie/trie.h" +#include "contrib/macros.h" +#include "contrib/mempattern.h" + +static int init(knot_db_t **db, knot_mm_t *mm, void *arg) +{ + if (db == NULL || arg == NULL) { + return KNOT_EINVAL; + } + + struct knot_db_trie_opts *opts = arg; + UNUSED(opts); + trie_t *trie = trie_create(mm); + if (!trie) { + return KNOT_ENOMEM; + } + + *db = trie; + + return KNOT_EOK; +} + +static void deinit(knot_db_t *db) +{ + trie_free((trie_t *)db); +} + +static int txn_begin(knot_db_t *db, knot_db_txn_t *txn, unsigned flags) +{ + txn->txn = (void *)(size_t)flags; + txn->db = db; + return KNOT_EOK; /* N/A */ +} + +static int txn_commit(knot_db_txn_t *txn) +{ + return KNOT_EOK; +} + +static void txn_abort(knot_db_txn_t *txn) +{ +} + +static int count(knot_db_txn_t *txn) +{ + return trie_weight((trie_t *)txn->db); +} + +static int clear(knot_db_txn_t *txn) +{ + trie_clear((trie_t *)txn->db); + + return KNOT_EOK; +} + +static int find(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags) +{ + trie_val_t *ret = trie_get_try((trie_t *)txn->db, key->data, key->len); + if (ret == NULL) { + return KNOT_ENOENT; + } + + val->data = *ret; + val->len = sizeof(trie_val_t); /* Trie doesn't support storing length. */ + return KNOT_EOK; +} + +static int insert(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags) +{ + /* No flags supported. */ + if (flags != 0) { + return KNOT_ENOTSUP; + } + + trie_val_t *ret = trie_get_ins((trie_t *)txn->db, key->data, key->len); + if (ret == NULL) { + return KNOT_ENOMEM; + } + + *ret = val->data; + return KNOT_EOK; +} + +static int del(knot_db_txn_t *txn, knot_db_val_t *key) +{ + return trie_del((trie_t *)txn->db, key->data, key->len, NULL); +} + +static knot_db_iter_t *iter_begin(knot_db_txn_t *txn, unsigned flags) +{ + flags &= ~KNOT_DB_SORTED; + + /* No operations other than begin are supported right now. */ + if (flags != 0) { + return NULL; + } + + return trie_it_begin((trie_t *)txn->db); +} + +static knot_db_iter_t *iter_seek(knot_db_iter_t *iter, knot_db_val_t *key, unsigned flags) +{ + assert(0); + return NULL; /* ENOTSUP */ +} + +static knot_db_iter_t *iter_next(knot_db_iter_t *iter) +{ + trie_it_next((trie_it_t *)iter); + if (trie_it_finished((trie_it_t *)iter)) { + trie_it_free((trie_it_t *)iter); + return NULL; + } + + return iter; +} + +static int iter_key(knot_db_iter_t *iter, knot_db_val_t *val) +{ + val->data = (void *)trie_it_key((trie_it_t *)iter, &val->len); + if (val->data == NULL) { + return KNOT_ENOENT; + } + + return KNOT_EOK; +} + +static int iter_val(knot_db_iter_t *iter, knot_db_val_t *val) +{ + trie_val_t *ret = trie_it_val((trie_it_t *)iter); + if (ret == NULL) { + return KNOT_ENOENT; + } + + val->data = *ret; + val->len = sizeof(trie_val_t); + return KNOT_EOK; +} + +static void iter_finish(knot_db_iter_t *iter) +{ + trie_it_free((trie_it_t *)iter); +} + +_public_ +const knot_db_api_t *knot_db_trie_api(void) +{ + static const knot_db_api_t api = { + "trie", + init, deinit, + txn_begin, txn_commit, txn_abort, + count, clear, find, insert, del, + iter_begin, iter_seek, iter_next, iter_key, iter_val, iter_finish + }; + + return &api; +} |