tommyarrayof.h

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/*
 * Copyright (c) 2013, Andrea Mazzoleni. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */

#ifndef __TOMMYARRAYOF_H
#define __TOMMYARRAYOF_H

#include "tommytypes.h"

#include <assert.h> /* for assert */

/******************************************************************************/
/* array */

#define TOMMY_ARRAYOF_BIT 6

#define TOMMY_ARRAYOF_BIT_MAX 32

typedef struct tommy_arrayof_struct {
        void* bucket[TOMMY_ARRAYOF_BIT_MAX]; 
        tommy_size_t element_size; 
        tommy_uint_t bucket_bit; 
        tommy_count_t bucket_max; 
        tommy_count_t count; 
} tommy_arrayof;

void tommy_arrayof_init(tommy_arrayof* array, tommy_size_t element_size);

void tommy_arrayof_done(tommy_arrayof* array);

void tommy_arrayof_grow(tommy_arrayof* array, tommy_count_t size);

tommy_inline void* tommy_arrayof_ref(tommy_arrayof* array, tommy_count_t pos)
{
        unsigned char* ptr;
        tommy_uint_t bsr;

        assert(pos < array->count);

        /* get the highest bit set, in case of all 0, return 0 */
        bsr = tommy_ilog2_u32(pos | 1);

        ptr = tommy_cast(unsigned char*, array->bucket[bsr]);

        return ptr + pos * array->element_size;
}

tommy_inline tommy_count_t tommy_arrayof_size(tommy_arrayof* array)
{
        return array->count;
}

tommy_size_t tommy_arrayof_memory_usage(tommy_arrayof* array);

#endif