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88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* Copyright (C) 2007-2012 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Anoop Saldanha <anoopsaldanha@gmail.com>
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*/
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#include "suricata-common.h"
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#include "suricata.h"
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#include "util-debug.h"
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#include "util-buffer.h"
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/* 10 mb */
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#define MAX_LIMIT 10485760
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MemBuffer *MemBufferCreateNew(uint32_t size)
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{
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if (size > MAX_LIMIT) {
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SCLogWarning(SC_ERR_MEM_BUFFER_API, "Mem buffer asked to create "
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"buffer with size greater than API limit - %d", MAX_LIMIT);
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return NULL;
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}
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uint32_t total_size = size + sizeof(MemBuffer);
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MemBuffer *buffer = SCMalloc(total_size);
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if (unlikely(buffer == NULL)) {
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return NULL;
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}
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memset(buffer, 0, total_size);
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buffer->size = size;
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buffer->buffer = (uint8_t *)buffer + sizeof(MemBuffer);
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return buffer;
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}
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/** \brief expand membuffer by size of 'expand_by'
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*
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* If expansion failed, buffer will still be valid.
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*
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* \retval result 0 ok, -1 expansion failed
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*/
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int MemBufferExpand(MemBuffer **buffer, uint32_t expand_by) {
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if (((*buffer)->size + expand_by) > MAX_LIMIT) {
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SCLogWarning(SC_ERR_MEM_BUFFER_API, "Mem buffer asked to create "
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"buffer with size greater than API limit - %d", MAX_LIMIT);
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return -1;
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}
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uint32_t total_size = (*buffer)->size + sizeof(MemBuffer) + expand_by;
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MemBuffer *tbuffer = SCRealloc(*buffer, total_size);
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if (unlikely(tbuffer == NULL)) {
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return -1;
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}
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*buffer = tbuffer;
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(*buffer)->size += expand_by;
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(*buffer)->buffer = (uint8_t *)tbuffer + sizeof(MemBuffer);
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SCLogDebug("expanded buffer by %u, size is now %u", expand_by, (*buffer)->size);
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return 0;
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}
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void MemBufferFree(MemBuffer *buffer)
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{
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SCFree(buffer);
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return;
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}
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