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diff --git a/include/iprt/formats/xar.h b/include/iprt/formats/xar.h
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+++ b/include/iprt/formats/xar.h
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+/** @file
+ * IPRT - Extensible Archiver (XAR) format.
+ */
+
+/*
+ * Copyright (C) 2013-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef IPRT_INCLUDED_formats_xar_h
+#define IPRT_INCLUDED_formats_xar_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/types.h>
+#include <iprt/assertcompile.h>
+
+
+/** @defgroup grp_rt_formats_xar   Extensible Archive (XAR) format
+ * @ingroup grp_rt_formats
+ *
+ * @{ */
+
+#pragma pack(4) /* Misdesigned header, not 8-byte aligned size. */
+typedef struct XARHEADER
+{
+    /** The magic number 'xar!' (XAR_HEADER_MAGIC). */
+    uint32_t    u32Magic;
+    /** The size of this header structure. */
+    uint16_t    cbHeader;
+    /** The header version structure. */
+    uint16_t    uVersion;
+    /** The size of the compressed table of content (TOC). */
+    uint64_t    cbTocCompressed;
+    /** The size of the table of context (TOC) when not compressed. */
+    uint64_t    cbTocUncompressed;
+    /** Which cryptographic hash function is used (XAR_HASH_XXX). */
+    uint32_t    uHashFunction;
+} XARHEADER;
+#pragma pack()
+AssertCompileSize(XARHEADER, 28);
+/** Pointer to a XAR header. */
+typedef XARHEADER *PXARHEADER;
+/** Pointer to a const XAR header. */
+typedef XARHEADER const *PCXARHEADER;
+
+/** XAR magic value (on disk endian). */
+#define XAR_HEADER_MAGIC        RT_H2LE_U32(RT_MAKE_U32_FROM_U8('x', 'a', 'r', '!'))
+/** The current header version value (host endian). */
+#define XAR_HEADER_VERSION      1
+
+/** @name XAR hashing functions.
+ * @{ */
+#define XAR_HASH_NONE           0
+#define XAR_HASH_SHA1           1
+#define XAR_HASH_MD5            2
+#define XAR_HASH_MAX            2
+/** @} */
+
+/** @} */
+
+#endif /* !IPRT_INCLUDED_formats_xar_h */
+