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/* Copyright (C) 2016 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 Justin Viiret <justin.viiret@intel.com>
*
* Support functions for Hyperscan library integration.
*/
#include "suricata-common.h"
#include "suricata.h"
#ifdef BUILD_HYPERSCAN
#include "util-hyperscan.h"
/**
* \internal
* \brief Convert a pattern into a regex string accepted by the Hyperscan
* compiler.
*
* For simplicity, we just take each byte of the original pattern and render it
* with a hex escape (i.e. ' ' -> "\x20")/
*/
char *HSRenderPattern(const uint8_t *pat, uint16_t pat_len)
{
if (pat == NULL) {
return NULL;
}
const size_t hex_len = (pat_len * 4) + 1;
char *str = SCMalloc(hex_len);
if (str == NULL) {
return NULL;
}
memset(str, 0, hex_len);
char *sp = str;
for (uint16_t i = 0; i < pat_len; i++) {
snprintf(sp, 5, "\\x%02x", pat[i]);
sp += 4;
}
*sp = '\0';
return str;
}
#endif /* BUILD_HYPERSCAN */
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