/*****************************************************************************

Copyright (c) 2006, 2011, Oracle and/or its affiliates. All Rights Reserved.

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; version 2 of the License.

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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/*******************************************************************//**
@file ut/ut0vec.cc
A vector of pointers to data items

Created 4/6/2006 Osku Salerma
************************************************************************/

#include "ut0vec.h"
#ifdef UNIV_NONINL
#include "ut0vec.ic"
#endif
#include "mem0mem.h"

/********************************************************************
Create a new vector with the given initial size. */
UNIV_INTERN
ib_vector_t*
ib_vector_create(
/*=============*/
					/* out: vector */
	ib_alloc_t*	allocator,	/* in: vector allocator */
	ulint		sizeof_value,	/* in: size of data item */
	ulint		size)		/* in: initial size */
{
	ib_vector_t*	vec;

	ut_a(size > 0);

	vec = static_cast<ib_vector_t*>(allocator->mem_malloc(allocator, sizeof(*vec)));

	vec->used = 0;
	vec->total = size;
	vec->allocator = allocator;
	vec->sizeof_value = sizeof_value;
	vec->data = static_cast<void*>(
		allocator->mem_malloc(allocator, vec->sizeof_value * size));

	return(vec);
}

/********************************************************************
Resize the vector, currently the vector can only grow and we
expand the number of elements it can hold by 2 times. */
UNIV_INTERN
void
ib_vector_resize(
/*=============*/
	ib_vector_t*	vec)		/* in: vector */
{
	ulint		new_total = vec->total * 2;
	ulint		old_size = vec->used * vec->sizeof_value;
	ulint		new_size = new_total * vec->sizeof_value;

	vec->data = static_cast<void*>(vec->allocator->mem_resize(
		vec->allocator, vec->data, old_size, new_size));

	vec->total = new_total;
}
