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/* Copyright (C) 2007-2012 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Anoop Saldanha <anoopsaldanha@gmail.com>
*/
#include "suricata-common.h"
#include "suricata.h"
#include "util-debug.h"
#include "util-buffer.h"
/* 10 mb */
#define MAX_LIMIT 10485760
MemBuffer *MemBufferCreateNew(uint32_t size)
{
if (size > MAX_LIMIT) {
SCLogWarning(SC_ERR_MEM_BUFFER_API, "Mem buffer asked to create "
"buffer with size greater than API limit - %d", MAX_LIMIT);
return NULL;
}
uint32_t total_size = size + sizeof(MemBuffer);
MemBuffer *buffer = SCMalloc(total_size);
if (unlikely(buffer == NULL)) {
return NULL;
}
memset(buffer, 0, total_size);
buffer->size = size;
buffer->buffer = (uint8_t *)buffer + sizeof(MemBuffer);
return buffer;
}
/** \brief expand membuffer by size of 'expand_by'
*
* If expansion failed, buffer will still be valid.
*
* \retval result 0 ok, -1 expansion failed
*/
int MemBufferExpand(MemBuffer **buffer, uint32_t expand_by) {
if (((*buffer)->size + expand_by) > MAX_LIMIT) {
SCLogWarning(SC_ERR_MEM_BUFFER_API, "Mem buffer asked to create "
"buffer with size greater than API limit - %d", MAX_LIMIT);
return -1;
}
uint32_t total_size = (*buffer)->size + sizeof(MemBuffer) + expand_by;
MemBuffer *tbuffer = SCRealloc(*buffer, total_size);
if (unlikely(tbuffer == NULL)) {
return -1;
}
*buffer = tbuffer;
(*buffer)->size += expand_by;
(*buffer)->buffer = (uint8_t *)tbuffer + sizeof(MemBuffer);
SCLogDebug("expanded buffer by %u, size is now %u", expand_by, (*buffer)->size);
return 0;
}
void MemBufferFree(MemBuffer *buffer)
{
SCFree(buffer);
return;
}
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