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/* Copyright (C) 2017 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 <https://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \brief Structures for binary data handling.
*
* \addtogroup db
* @{
*/
#pragma once
#include "libknot/mm_ctx.h"
enum {
/* Database flags */
KNOT_DB_RDONLY = 1 << 0, /*!< Read only. */
KNOT_DB_SORTED = 1 << 1, /*!< Sorted output. */
/* Operations */
KNOT_DB_NOOP = 1 << 2, /*!< No operation. */
KNOT_DB_FIRST = 1 << 3, /*!< First entry. */
KNOT_DB_LAST = 1 << 4, /*!< Last entry. */
KNOT_DB_NEXT = 1 << 5, /*!< Next entry. */
KNOT_DB_PREV = 1 << 6, /*!< Previous entry. */
KNOT_DB_LEQ = 1 << 7, /*!< Lesser or equal. */
KNOT_DB_GEQ = 1 << 8 /*!< Greater or equal. */
};
typedef void knot_db_t;
typedef void knot_db_iter_t;
typedef struct knot_db_val {
void *data;
size_t len;
} knot_db_val_t;
typedef struct knot_db_txn {
knot_db_t *db;
void *txn;
} knot_db_txn_t;
typedef struct knot_db_api {
const char *name;
/* Context operations */
int (*init)(knot_db_t **db, knot_mm_t *mm, void *opts);
void (*deinit)(knot_db_t *db);
/* Transactions */
int (*txn_begin)(knot_db_t *db, knot_db_txn_t *txn, unsigned flags);
int (*txn_commit)(knot_db_txn_t *txn);
void (*txn_abort)(knot_db_txn_t *txn);
/* Data access */
int (*count)(knot_db_txn_t *txn);
int (*clear)(knot_db_txn_t *txn);
int (*find)(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags);
int (*insert)(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags);
int (*del)(knot_db_txn_t *txn, knot_db_val_t *key);
/* Iteration */
knot_db_iter_t *(*iter_begin)(knot_db_txn_t *txn, unsigned flags);
knot_db_iter_t *(*iter_seek)(knot_db_iter_t *iter, knot_db_val_t *key, unsigned flags);
knot_db_iter_t *(*iter_next)(knot_db_iter_t *iter);
int (*iter_key)(knot_db_iter_t *iter, knot_db_val_t *key);
int (*iter_val)(knot_db_iter_t *iter, knot_db_val_t *val);
void (*iter_finish)(knot_db_iter_t *iter);
} knot_db_api_t;
/*! @} */
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