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diff --git a/src/detect-engine-state.h b/src/detect-engine-state.h
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+/* Copyright (C) 2007-2013 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 sigstate
+ *
+ * @{
+ */
+
+/**
+ * \file
+ *
+ * \brief Data structures and function prototypes for keeping
+ *        state for the detection engine.
+ *
+ * \author Victor Julien <victor@inliniac.net>
+ * \author Anoop Saldanha <anoopsaldanha@gmail.com>
+ */
+
+
+#ifndef __DETECT_ENGINE_STATE_H__
+#define __DETECT_ENGINE_STATE_H__
+
+#define DETECT_ENGINE_INSPECT_SIG_NO_MATCH 0
+#define DETECT_ENGINE_INSPECT_SIG_MATCH 1
+#define DETECT_ENGINE_INSPECT_SIG_CANT_MATCH 2
+/** indicate that the file inspection portion of a sig didn't match.
+ *  This is used to handle state keeping as the detect engine is still
+ *  only marginally aware of files. */
+#define DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILES 3
+/** hack to work around a file inspection limitation. Since there can be
+ *  multiple files in a TX and the detection engine really don't know
+ *  about that, we have to give the file inspection engine a way to
+ *  indicate that one of the files matched, but that there are still
+ *  more files that have ongoing inspection. */
+#define DETECT_ENGINE_INSPECT_SIG_MATCH_MORE_FILES 4
+
+/** number of DeStateStoreItem's in one DeStateStore object */
+#define DE_STATE_CHUNK_SIZE             15
+
+/* per sig flags */
+#define DE_STATE_FLAG_FULL_INSPECT              BIT_U32(0)
+#define DE_STATE_FLAG_SIG_CANT_MATCH            BIT_U32(1)
+/* flag set if file inspecting sig did not match, but might need to be
+ * re-evaluated for a new file in a tx */
+#define DE_STATE_ID_FILE_INSPECT                2UL
+#define DE_STATE_FLAG_FILE_INSPECT              BIT_U32(DE_STATE_ID_FILE_INSPECT)
+
+/* first bit position after the built-ins */
+#define DE_STATE_FLAG_BASE                      3UL
+
+/* state flags
+ *
+ * Used by app-layer-parsers to notify us that new files
+ * are available in the tx.
+ */
+#define DETECT_ENGINE_STATE_FLAG_FILE_NEW       BIT_U8(0)
+
+typedef struct DeStateStoreItem_ {
+    uint32_t flags;
+    SigIntId sid;
+} DeStateStoreItem;
+
+typedef struct DeStateStore_ {
+    DeStateStoreItem store[DE_STATE_CHUNK_SIZE];
+    struct DeStateStore_ *next;
+} DeStateStore;
+
+typedef struct DetectEngineStateDirection_ {
+    DeStateStore *head; /**< head of the list */
+    DeStateStore *cur;  /**< current active store */
+    DeStateStore *tail; /**< tail of the list */
+    SigIntId cnt;
+    uint16_t filestore_cnt;
+    uint8_t flags;
+    /* coccinelle: DetectEngineStateDirection:flags:DETECT_ENGINE_STATE_FLAG_ */
+} DetectEngineStateDirection;
+
+typedef struct DetectEngineState_ {
+    DetectEngineStateDirection dir_state[2];
+} DetectEngineState;
+
+/**
+ * \brief Alloc a DetectEngineState object.
+ *
+ * \retval Alloc'd instance of DetectEngineState.
+ */
+DetectEngineState *DetectEngineStateAlloc(void);
+
+/**
+ * \brief Frees a DetectEngineState object.
+ *
+ * \param state DetectEngineState instance to free.
+ */
+void DetectEngineStateFree(DetectEngineState *state);
+
+#endif /* __DETECT_ENGINE_STATE_H__ */
+
+/**
+ * @}
+ */