/* Copyright (C) 2007-2021 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.

 */

/**

 * \ingroup httplayer

 *

 * @{

 */

#include "suricata-common.h"

#include "threads.h"

#include "decode.h"

#include "detect.h"

#include "detect-parse.h"

#include "detect-engine.h"

#include "detect-engine-mpm.h"

#include "detect-engine-state.h"

#include "detect-engine-prefilter.h"

#include "detect-engine-content-inspection.h"

#include "detect-content.h"

#include "detect-pcre.h"

#include "flow.h"

#include "flow-var.h"

#include "flow-util.h"

#include "util-debug.h"

#include "util-unittest.h"

#include "util-unittest-helper.h"

#include "util-spm.h"

#include "util-print.h"

#include "app-layer.h"

#include "app-layer-parser.h"

#include "app-layer-htp.h"

#include "detect-http-header.h"

#include "stream-tcp.h"

#include "detect-http-header-common.h"

void *HttpHeaderThreadDataInit(void *data)

{

    HttpHeaderThreadData *td = SCCalloc(1, sizeof(*td));

    if (td != NULL) {

        if (data == NULL) {

            td->size_step = 512;

        } else {

            HttpHeaderThreadDataConfig *c = data;

            td->size_step = c->size_step;

        }

        /* initialize minimal buffers */

        (void)HttpHeaderExpandBuffer(td, &td->buffer, 1);

    }

    return td;

}

void HttpHeaderThreadDataFree(void *data)

{

    HttpHeaderThreadData *hdrnames = data;

    SCFree(hdrnames->buffer.buffer);

    SCFree(hdrnames);

}

int HttpHeaderExpandBuffer(HttpHeaderThreadData *td,

        HttpHeaderBuffer *buf, uint32_t size)

{

    size_t extra = td->size_step;

    while ((buf->size + extra) < (size + buf->len)) {

        extra += td->size_step;

    }

    SCLogDebug("adding %"PRIuMAX" to the buffer", (uintmax_t)extra);

    uint8_t *new_buffer = SCRealloc(buf->buffer, buf->size + extra);

    if (unlikely(new_buffer == NULL)) {

        buf->len = 0;

        return -1;

    }

    buf->buffer = new_buffer;

    buf->size += extra;

    return 0;

}

HttpHeaderBuffer *HttpHeaderGetBufferSpace(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags,

        const int keyword_id, HttpHeaderThreadData **ret_hdr_td)

{

    *ret_hdr_td = NULL;

    HttpHeaderThreadData *hdr_td =

        DetectThreadCtxGetGlobalKeywordThreadCtx(det_ctx, keyword_id);

    if (hdr_td == NULL)

        return NULL;

    *ret_hdr_td = hdr_td;

    HttpHeaderBuffer *buf = &hdr_td->buffer;

    buf->len = 0;

    return buf;

}