diff --git a/toolbox/dd.h b/toolbox/dd.h
new file mode 100644
index 0000000..794a464
--- /dev/null
+++ b/toolbox/dd.h
@@ -0,0 +1,91 @@
+/*	$NetBSD: dd.h,v 1.12 2004/01/17 20:48:57 dbj Exp $	*/
+
+/*-
+ * Copyright (c) 1991, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Keith Muller of the University of California, San Diego and Lance
+ * Visser of Convex Computer Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)dd.h	8.3 (Berkeley) 4/2/94
+ */
+
+/* Input/output stream state. */
+typedef struct {
+	u_char		*db;		/* buffer address */
+	u_char		*dbp;		/* current buffer I/O address */
+	uint64_t	dbcnt;		/* current buffer byte count */
+	int64_t		dbrcnt;		/* last read byte count */
+	uint64_t	dbsz;		/* buffer size */
+
+#define	ISCHR		0x01		/* character device (warn on short) */
+#define	ISPIPE		0x02		/* pipe (not truncatable) */
+#define	ISTAPE		0x04		/* tape (not seekable) */
+#define	NOREAD		0x08		/* not readable */
+	u_int		flags;
+
+	const char  	*name;		/* name */
+	int		fd;		/* file descriptor */
+	uint64_t	offset;		/* # of blocks to skip */
+} IO;
+
+typedef struct {
+	uint64_t	in_full;	/* # of full input blocks */
+	uint64_t	in_part;	/* # of partial input blocks */
+	uint64_t	out_full;	/* # of full output blocks */
+	uint64_t	out_part;	/* # of partial output blocks */
+	uint64_t	trunc;		/* # of truncated records */
+	uint64_t	swab;		/* # of odd-length swab blocks */
+	uint64_t	sparse;		/* # of sparse output blocks */
+	uint64_t	bytes;		/* # of bytes written */
+	struct timeval	start;		/* start time of dd */
+} STAT;
+
+/* Flags (in ddflags). */
+#define	C_ASCII		0x00001
+#define	C_BLOCK		0x00002
+#define	C_BS		0x00004
+#define	C_CBS		0x00008
+#define	C_COUNT		0x00010
+#define	C_EBCDIC	0x00020
+#define	C_FILES		0x00040
+#define	C_IBS		0x00080
+#define	C_IF		0x00100
+#define	C_LCASE		0x00200
+#define	C_NOERROR	0x00400
+#define	C_NOTRUNC	0x00800
+#define	C_OBS		0x01000
+#define	C_OF		0x02000
+#define	C_SEEK		0x04000
+#define	C_SKIP		0x08000
+#define	C_SWAB		0x10000
+#define	C_SYNC		0x20000
+#define	C_UCASE		0x40000
+#define	C_UNBLOCK	0x80000
+#define	C_OSYNC		0x100000
+#define	C_SPARSE	0x200000