mariadb/storage/tokudb/ft-index/util/dbt.h

/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:

#ident "$Id$"
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  TokuFT, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

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  This program is distributed in the hope that it will be useful, but
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UNIVERSITY PATENT NOTICE:

  The technology is licensed by the Massachusetts Institute of
  Technology, Rutgers State University of New Jersey, and the Research
  Foundation of State University of New York at Stony Brook under
  United States of America Serial No. 11/760379 and to the patents
  and/or patent applications resulting from it.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.
  This software is covered by US Patent No. 8,489,638.

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*/

#pragma once

#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."

#include <db.h>

// TODO: John
// Document this API a little better so that DBT
// memory management can be morm widely understood.

DBT *toku_init_dbt(DBT *);

// returns: an initialized but empty dbt (for which toku_dbt_is_empty() is true)
DBT toku_empty_dbt(void);

DBT *toku_init_dbt_flags(DBT *, uint32_t flags);

void toku_destroy_dbt(DBT *);

DBT *toku_fill_dbt(DBT *dbt, const void *k, uint32_t len);

DBT *toku_memdup_dbt(DBT *dbt, const void *k, size_t len);

DBT *toku_copyref_dbt(DBT *dst, const DBT src);

DBT *toku_clone_dbt(DBT *dst, const DBT &src);

int toku_dbt_set(uint32_t len, const void *val, DBT *d, struct simple_dbt *sdbt);

int toku_dbt_set_value(DBT *, const void **val, uint32_t vallen, void **staticptrp, bool dbt1_disposable);

void toku_sdbt_cleanup(struct simple_dbt *sdbt);

// returns: special DBT pointer representing positive infinity
const DBT *toku_dbt_positive_infinity(void);

// returns: special DBT pointer representing negative infinity
const DBT *toku_dbt_negative_infinity(void);

// returns: true if the given dbt is either positive or negative infinity
bool toku_dbt_is_infinite(const DBT *dbt);

// returns: true if the given dbt has no data (ie: dbt->data == nullptr)
bool toku_dbt_is_empty(const DBT *dbt);

// effect: compares two potentially infinity-valued dbts
// requires: at least one is infinite (assert otherwise)
int toku_dbt_infinite_compare(const DBT *a, const DBT *b);

// returns: true if the given dbts have the same data pointer and size
bool toku_dbt_equals(const DBT *a, const DBT *b);