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diff --git a/src/lttng-index.h b/src/lttng-index.h
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+/*
+ * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
+ *                      David Goulet <dgoulet@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * 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 along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef LTTNG_INDEX_H
+#define LTTNG_INDEX_H
+
+#include <limits.h>
+
+#define INDEX_MAGIC "CTFIDX"
+#define INDEX_MAJOR 1
+#define INDEX_MINOR 0
+
+/*
+ * Header at the beginning of each index file.
+ * All integer fields are stored in big endian.
+ */
+struct lttng_packet_index_file_hdr {
+	char magic[6];
+	uint32_t index_major;
+	uint32_t index_minor;
+} __attribute__((__packed__));
+
+/*
+ * Packet index generated for each trace packet store in a trace file.
+ * All integer fields are stored in big endian.
+ */
+struct lttng_packet_index {
+	uint64_t offset;		/* offset of the packet in the file, in bytes */
+	uint64_t packet_size;		/* packet size, in bits */
+	uint64_t content_size;		/* content size, in bits */
+	uint64_t timestamp_begin;
+	uint64_t timestamp_end;
+	uint64_t events_discarded;
+	uint64_t stream_id;
+} __attribute__((__packed__));
+
+#endif /* LTTNG_INDEX_H */