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/* wmem_array.c
* Wireshark Memory Manager Array
* Copyright 2013, Evan Huus <eapache@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <glib.h>
#include "wmem_core.h"
#include "wmem_array.h"
/* Holds a wmem-allocated array.
* elem_len is the size of each element
* elem_count is the number of used elements
* alloc_count is the length (in elems) of the raw buffer pointed to by buf,
* regardless of how many elems are used (the contents)
*/
struct _wmem_array_t {
wmem_allocator_t *allocator;
guint8 *buf;
gsize elem_size;
guint elem_count;
guint alloc_count;
gboolean null_terminated;
};
wmem_array_t *
wmem_array_sized_new(wmem_allocator_t *allocator, gsize elem_size,
guint alloc_count)
{
wmem_array_t *array;
array = wmem_new(allocator, wmem_array_t);
array->allocator = allocator;
array->elem_size = elem_size;
array->elem_count = 0;
array->alloc_count = alloc_count ? alloc_count : 1;
array->null_terminated = FALSE;
array->buf = (guint8 *)wmem_alloc(array->allocator,
array->elem_size * array->alloc_count);
return array;
}
wmem_array_t *
wmem_array_new(wmem_allocator_t *allocator, const gsize elem_size)
{
wmem_array_t *array;
array = wmem_array_sized_new(allocator, elem_size, 1);
return array;
}
static void
wmem_array_grow(wmem_array_t *array, const guint to_add)
{
guint new_alloc_count, new_count;
new_alloc_count = array->alloc_count;
new_count = array->elem_count + to_add;
while (new_alloc_count < new_count) {
new_alloc_count *= 2;
}
if (new_alloc_count == array->alloc_count) {
return;
}
array->buf = (guint8 *)wmem_realloc(array->allocator, array->buf,
new_alloc_count * array->elem_size);
array->alloc_count = new_alloc_count;
}
static void
wmem_array_write_null_terminator(wmem_array_t *array)
{
if (array->null_terminated) {
wmem_array_grow(array, 1);
memset(&array->buf[array->elem_count * array->elem_size], 0x0, array->elem_size);
}
}
void
wmem_array_set_null_terminator(wmem_array_t *array)
{
array->null_terminated = TRUE;
wmem_array_write_null_terminator(array);
}
void
wmem_array_bzero(wmem_array_t *array)
{
memset(array->buf, 0x0, array->elem_size * array->elem_count);
}
void
wmem_array_append(wmem_array_t *array, const void *in, guint count)
{
wmem_array_grow(array, count);
memcpy(&array->buf[array->elem_count * array->elem_size], in,
count * array->elem_size);
array->elem_count += count;
wmem_array_write_null_terminator(array);
}
void *
wmem_array_index(wmem_array_t *array, guint array_index)
{
g_assert(array_index < array->elem_count);
return &array->buf[array_index * array->elem_size];
}
void
wmem_array_sort(wmem_array_t *array, int (*compar)(const void*,const void*))
{
qsort(array->buf, array->elem_count, array->elem_size, compar);
}
void *
wmem_array_get_raw(wmem_array_t *array)
{
return array->buf;
}
guint
wmem_array_get_count(wmem_array_t *array)
{
return array->elem_count;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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