add support for reading and writing PWB and V7 cpio archives

9 files changed, 646 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index 3d30b6e1..1ead2813 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -224,6 +224,7 @@ libarchive_la_SOURCES= \
 	libarchive/archive_write_set_format_ar.c \
 	libarchive/archive_write_set_format_by_name.c \
 	libarchive/archive_write_set_format_cpio.c \
+	libarchive/archive_write_set_format_cpio_binary.c \
 	libarchive/archive_write_set_format_cpio_newc.c \
 	libarchive/archive_write_set_format_cpio_odc.c \
 	libarchive/archive_write_set_format_filter_by_ext.c \
diff --git a/cpio/cmdline.c b/cpio/cmdline.c
index c8fc30ea..0ca9b4de 100644
--- a/cpio/cmdline.c
+++ b/cpio/cmdline.c
@@ -51,7 +51,7 @@ __FBSDID("$FreeBSD: src/usr.bin/cpio/cmdline.c,v 1.5 2008/12/06 07:30:40 kientzl
 /*
  * Short options for cpio.  Please keep this sorted.
  */
-static const char *short_options = "0AaBC:cdE:F:f:H:hI:iJjLlmnO:opR:rtuVvW:yZz";
+static const char *short_options = "06AaBC:cdE:F:f:H:hI:iJjLlmnO:opR:rtuVvW:yZz";
 
 /*
  * Long options for cpio.  Please keep this sorted.
@@ -86,6 +86,7 @@ static const struct option {
 	{ "pass-through",		0, 'p' },
 	{ "preserve-modification-time", 0, 'm' },
 	{ "preserve-owner",		0, OPTION_PRESERVE_OWNER },
+	{ "pwb",			0, '6' },
 	{ "quiet",			0, OPTION_QUIET },
 	{ "unconditional",		0, 'u' },
 	{ "uuencode",			0, OPTION_UUENCODE },
diff --git a/cpio/cpio.c b/cpio/cpio.c
index e073bae0..678d2419 100644
--- a/cpio/cpio.c
+++ b/cpio/cpio.c
@@ -192,6 +192,9 @@ main(int argc, char *argv[])
 		case '0': /* GNU convention: --null, -0 */
 			cpio->option_null = 1;
 			break;
+		case '6': /* 6th edition (PWB) interpretation of file mode bits */
+			cpio->option_pwb = 1;
+			break;
 		case 'A': /* NetBSD/OpenBSD */
 			cpio->option_append = 1;
 			break;
@@ -583,6 +586,8 @@ mode_out(struct cpio *cpio)
 	}
 	if (r < ARCHIVE_WARN)
 		lafe_errc(1, 0, "Requested filter not available");
+	if (cpio->option_pwb)
+		cpio->format = "pwb";
 	r = archive_write_set_format_by_name(cpio->archive, cpio->format);
 	if (r != ARCHIVE_OK)
 		lafe_errc(1, 0, "%s", archive_error_string(cpio->archive));
@@ -968,6 +973,8 @@ mode_in(struct cpio *cpio)
 		lafe_errc(1, 0, "Couldn't allocate archive object");
 	archive_read_support_filter_all(a);
 	archive_read_support_format_all(a);
+	if (cpio->option_pwb)
+		archive_read_set_options(a, "pwb");
 	if (cpio->passphrase != NULL)
 		r = archive_read_add_passphrase(a, cpio->passphrase);
 	else
@@ -1078,6 +1085,8 @@ mode_list(struct cpio *cpio)
 		lafe_errc(1, 0, "Couldn't allocate archive object");
 	archive_read_support_filter_all(a);
 	archive_read_support_format_all(a);
+	if (cpio->option_pwb)
+		archive_read_set_options(a, "pwb");
 	if (cpio->passphrase != NULL)
 		r = archive_read_add_passphrase(a, cpio->passphrase);
 	else
diff --git a/cpio/cpio.h b/cpio/cpio.h
index 8e7cc5fd..a71b6649 100644
--- a/cpio/cpio.h
+++ b/cpio/cpio.h
@@ -62,6 +62,7 @@ struct cpio {
 	int		  option_list; /* -t */
 	char		  option_null; /* --null */
 	int		  option_numeric_uid_gid; /* -n */
+	int		  option_pwb; /* -6 */
 	int		  option_rename; /* -r */
 	char		 *destdir;
 	size_t		  destdir_len;
diff --git a/libarchive/archive.h b/libarchive/archive.h
index 47d04ef3..750e689e 100644
--- a/libarchive/archive.h
+++ b/libarchive/archive.h
@@ -319,6 +319,7 @@ typedef const char *archive_passphrase_callback(struct archive *,
 #define	ARCHIVE_FORMAT_CPIO_SVR4_NOCRC		(ARCHIVE_FORMAT_CPIO | 4)
 #define	ARCHIVE_FORMAT_CPIO_SVR4_CRC		(ARCHIVE_FORMAT_CPIO | 5)
 #define	ARCHIVE_FORMAT_CPIO_AFIO_LARGE		(ARCHIVE_FORMAT_CPIO | 6)
+#define	ARCHIVE_FORMAT_CPIO_PWB			(ARCHIVE_FORMAT_CPIO | 7)
 #define	ARCHIVE_FORMAT_SHAR			0x20000
 #define	ARCHIVE_FORMAT_SHAR_BASE		(ARCHIVE_FORMAT_SHAR | 1)
 #define	ARCHIVE_FORMAT_SHAR_DUMP		(ARCHIVE_FORMAT_SHAR | 2)
@@ -800,8 +801,10 @@ __LA_DECL int archive_write_set_format_7zip(struct archive *);
 __LA_DECL int archive_write_set_format_ar_bsd(struct archive *);
 __LA_DECL int archive_write_set_format_ar_svr4(struct archive *);
 __LA_DECL int archive_write_set_format_cpio(struct archive *);
+__LA_DECL int archive_write_set_format_cpio_bin(struct archive *);
 __LA_DECL int archive_write_set_format_cpio_newc(struct archive *);
 __LA_DECL int archive_write_set_format_cpio_odc(struct archive *);
+__LA_DECL int archive_write_set_format_cpio_pwb(struct archive *);
 __LA_DECL int archive_write_set_format_gnutar(struct archive *);
 __LA_DECL int archive_write_set_format_iso9660(struct archive *);
 __LA_DECL int archive_write_set_format_mtree(struct archive *);
diff --git a/libarchive/archive_read_support_format_cpio.c b/libarchive/archive_read_support_format_cpio.c
index 1c96e6ac..d81752ea 100644
--- a/libarchive/archive_read_support_format_cpio.c
+++ b/libarchive/archive_read_support_format_cpio.c
@@ -185,6 +185,8 @@ struct cpio {
 	struct archive_string_conv *opt_sconv;
 	struct archive_string_conv *sconv_default;
 	int			  init_default_conversion;
+
+	int			  option_pwb;
 };
 
 static int64_t	atol16(const char *, unsigned);
@@ -343,6 +345,10 @@ archive_read_format_cpio_options(struct archive_read *a,
 				ret = ARCHIVE_FATAL;
 		}
 		return (ret);
+	} else if (strcmp(key, "pwb")  == 0) {
+		if (val != NULL && val[0] != 0)
+			cpio->option_pwb = 1;
+		ret = ARCHIVE_OK;
 	}
 
 	/* Note: The "warn" return is just to inform the options
@@ -891,6 +897,12 @@ header_bin_le(struct archive_read *a, struct cpio *cpio,
 	archive_entry_set_dev(entry, header[bin_dev_offset] + header[bin_dev_offset + 1] * 256);
 	archive_entry_set_ino(entry, header[bin_ino_offset] + header[bin_ino_offset + 1] * 256);
 	archive_entry_set_mode(entry, header[bin_mode_offset] + header[bin_mode_offset + 1] * 256);
+	if (cpio->option_pwb) {
+		/* turn off random bits left over from V6 inode */
+		archive_entry_set_mode(entry, archive_entry_mode(entry) & 067777);
+		if ((archive_entry_mode(entry) & AE_IFMT) == 0)
+			archive_entry_set_mode(entry, archive_entry_mode(entry) | AE_IFREG);
+	}
 	archive_entry_set_uid(entry, header[bin_uid_offset] + header[bin_uid_offset + 1] * 256);
 	archive_entry_set_gid(entry, header[bin_gid_offset] + header[bin_gid_offset + 1] * 256);
 	archive_entry_set_nlink(entry, header[bin_nlink_offset] + header[bin_nlink_offset + 1] * 256);
@@ -930,6 +942,12 @@ header_bin_be(struct archive_read *a, struct cpio *cpio,
 	archive_entry_set_dev(entry, header[bin_dev_offset] * 256 + header[bin_dev_offset + 1]);
 	archive_entry_set_ino(entry, header[bin_ino_offset] * 256 + header[bin_ino_offset + 1]);
 	archive_entry_set_mode(entry, header[bin_mode_offset] * 256 + header[bin_mode_offset + 1]);
+	if (cpio->option_pwb) {
+		/* turn off random bits left over from V6 inode */
+		archive_entry_set_mode(entry, archive_entry_mode(entry) & 067777);
+		if ((archive_entry_mode(entry) & AE_IFMT) == 0)
+			archive_entry_set_mode(entry, archive_entry_mode(entry) | AE_IFREG);
+	}
 	archive_entry_set_uid(entry, header[bin_uid_offset] * 256 + header[bin_uid_offset + 1]);
 	archive_entry_set_gid(entry, header[bin_gid_offset] * 256 + header[bin_gid_offset + 1]);
 	archive_entry_set_nlink(entry, header[bin_nlink_offset] * 256 + header[bin_nlink_offset + 1]);
diff --git a/libarchive/archive_write_set_format.c b/libarchive/archive_write_set_format.c
index ab32945f..1f65fa4a 100644
--- a/libarchive/archive_write_set_format.c
+++ b/libarchive/archive_write_set_format.c
@@ -44,6 +44,8 @@ struct { int code; int (*setter)(struct archive *); } codes[] =
 {
 	{ ARCHIVE_FORMAT_7ZIP,		archive_write_set_format_7zip },
 	{ ARCHIVE_FORMAT_CPIO,		archive_write_set_format_cpio },
+	{ ARCHIVE_FORMAT_CPIO_BIN_LE,	archive_write_set_format_cpio_bin },
+	{ ARCHIVE_FORMAT_CPIO_PWB,	archive_write_set_format_cpio_pwb },
 	{ ARCHIVE_FORMAT_CPIO_POSIX,	archive_write_set_format_cpio_odc },
 	{ ARCHIVE_FORMAT_CPIO_SVR4_NOCRC,	archive_write_set_format_cpio_newc },
 	{ ARCHIVE_FORMAT_ISO9660,	archive_write_set_format_iso9660 },
diff --git a/libarchive/archive_write_set_format_by_name.c b/libarchive/archive_write_set_format_by_name.c
index 92770737..bfb4b354 100644
--- a/libarchive/archive_write_set_format_by_name.c
+++ b/libarchive/archive_write_set_format_by_name.c
@@ -49,6 +49,7 @@ struct { const char *name; int (*setter)(struct archive *); } names[] =
 	{ "arbsd",	archive_write_set_format_ar_bsd },
 	{ "argnu",	archive_write_set_format_ar_svr4 },
 	{ "arsvr4",	archive_write_set_format_ar_svr4 },
+	{ "bin",	archive_write_set_format_cpio_bin },
 	{ "bsdtar",	archive_write_set_format_pax_restricted },
 	{ "cd9660",	archive_write_set_format_iso9660 },
 	{ "cpio",	archive_write_set_format_cpio },
@@ -63,6 +64,7 @@ struct { const char *name; int (*setter)(struct archive *); } names[] =
 	{ "pax",	archive_write_set_format_pax },
 	{ "paxr",	archive_write_set_format_pax_restricted },
 	{ "posix",	archive_write_set_format_pax },
+	{ "pwb",	archive_write_set_format_cpio_pwb },
 	{ "raw",	archive_write_set_format_raw },
 	{ "rpax",	archive_write_set_format_pax_restricted },
 	{ "shar",	archive_write_set_format_shar },
diff --git a/libarchive/archive_write_set_format_cpio_binary.c b/libarchive/archive_write_set_format_cpio_binary.c
new file mode 100644
index 00000000..01aca6f0
--- /dev/null
+++ b/libarchive/archive_write_set_format_cpio_binary.c
@@ -0,0 +1,608 @@
+/*-
+ * Copyright (c) 2003-2007 Tim Kientzle
+ * Copyright (c) 2011-2012 Michihiro NAKAJIMA
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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.
+ */
+
+#include "archive_platform.h"
+__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_cpio.c 201170 2009-12-29 06:34:23Z kientzle $");
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "archive_entry_locale.h"
+#include "archive_private.h"
+#include "archive_write_private.h"
+#include "archive_write_set_format_private.h"
+
+static ssize_t	archive_write_binary_data(struct archive_write *,
+		    const void *buff, size_t s);
+static int	archive_write_binary_close(struct archive_write *);
+static int	archive_write_binary_free(struct archive_write *);
+static int	archive_write_binary_finish_entry(struct archive_write *);
+static int	archive_write_binary_header(struct archive_write *,
+		    struct archive_entry *);
+static int	archive_write_binary_options(struct archive_write *,
+		    const char *, const char *);
+static int	write_header(struct archive_write *, struct archive_entry *);
+
+struct cpio {
+	uint64_t	  entry_bytes_remaining;
+
+	int64_t		  ino_next;
+
+	struct		 { int64_t old; int new;} *ino_list;
+	size_t		  ino_list_size;
+	size_t		  ino_list_next;
+
+	struct archive_string_conv *opt_sconv;
+	struct archive_string_conv *sconv_default;
+	int		  init_default_conversion;
+};
+
+/* This struct needs to be packed to get the header right */
+
+#if defined(__GNUC__)
+#define PACKED(x) x __attribute__((packed))
+#elif defined(_MSC_VER)
+#define PACKED(x) __pragma(pack(push, 1)) x __pragma(pack(pop))
+#else
+#define PACKED(x) x
+#endif
+
+#define HSIZE 26
+
+PACKED(struct cpio_binary_header {
+	uint16_t	h_magic;
+	uint16_t	h_dev;
+	uint16_t	h_ino;
+	uint16_t	h_mode;
+	uint16_t	h_uid;
+	uint16_t	h_gid;
+	uint16_t	h_nlink;
+	uint16_t	h_majmin;
+	uint32_t	h_mtime;
+	uint16_t	h_namesize;
+	uint32_t	h_filesize;
+});
+
+/* Back in the day, the 7th Edition cpio.c had this, to
+ * adapt to, as the comment said, "VAX, Interdata, ...":
+ *
+ * union { long l; short s[2]; char c[4]; } U;
+ * #define MKSHORT(v,lv) {U.l=1L;if(U.c[0]) U.l=lv,v[0]=U.s[1],v[1]=U.s[0]; else U.l=lv,v[0]=U.s[0],v[1]=U.s[1];}
+ * long mklong(v)
+ * short v[];
+ * {
+ *         U.l = 1;
+ *         if(U.c[0])
+ *                 U.s[0] = v[1], U.s[1] = v[0];
+ *         else
+ *                 U.s[0] = v[0], U.s[1] = v[1];
+ *         return U.l;
+ * }
+ *
+ * Of course, that assumes that all machines have little-endian shorts,
+ * and just adapts the others to the special endianness of the PDP-11.
+ *
+ * Now, we could do this:
+ *
+ * union { uint32_t l; uint16_t s[2]; uint8_t c[4]; } U;
+ * #define PUTI16(v,sv) {U.s[0]=1;if(U.c[0]) v=sv; else U.s[0]=sv,U.c[2]=U.c[1],U.c[3]=U.c[0],v=U.s[1];}
+ * #define PUTI32(v,lv) {char_t Ut;U.l=1;if(U.c[0]) U.l=lv,v[0]=U.s[1],v[1]=U.s[0]; else U.l=lv,Ut=U.c[0],U.c[0]=U.c[1],U.c[1]=Ut,Ut=U.c[2],U.c[2]=U.c[3],U.c[3]=Ut,v[0]=U.s[0],v[1]=U.s[1];}
+ *
+ * ...but it feels a little better to do it like this (which by the way,
+ * assumes that it will never be run on a PDP-11):
+ */
+
+static uint16_t swap16(uint16_t in) {
+	union {
+		uint16_t s[2];
+		uint8_t c[4];
+	} U;
+	U.s[0] = 1;
+	if (U.c[0])
+		return in;
+	else {
+		U.s[0] = in;
+		U.c[2] = U.c[1];
+		U.c[3] = U.c[0];
+		return U.s[1];
+	}
+	/* NOTREACHED */
+}
+
+static uint32_t swap32(uint32_t in) {
+	union {
+		uint32_t l;
+		uint16_t s[2];
+		uint8_t c[4];
+	} U;
+	U.l = 1;
+	if (U.c[0]) {
+		uint16_t t;
+		U.l = in;
+		t = U.s[0];
+		U.s[0] = U.s[1];
+		U.s[1] = t;
+	} else {
+		uint8_t t;
+		U.l = in;
+		t = U.c[0];
+		U.c[0] = U.c[1];
+		U.c[1] = t;
+		t = U.c[2];
+		U.c[2] = U.c[3];
+		U.c[3] = t;
+	}
+	return U.l;
+}
+
+/*
+ * Set output format to the selected binary variant
+ */
+static int
+archive_write_set_format_cpio_binary(struct archive *_a, int format)
+{
+	struct archive_write *a = (struct archive_write *)_a;
+	struct cpio *cpio;
+
+	if (sizeof(struct cpio_binary_header) != HSIZE) {
+		archive_set_error(&a->archive, EINVAL,
+				  "Binary cpio format not supported on this platform");
+		return (ARCHIVE_FATAL);
+	}
+
+	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
+	    ARCHIVE_STATE_NEW, "archive_write_set_format_cpio_binary");
+
+	/* If someone else was already registered, unregister them. */
+	if (a->format_free != NULL)
+		(a->format_free)(a);
+
+	cpio = (struct cpio *)calloc(1, sizeof(*cpio));
+	if (cpio == NULL) {
+		archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data");
+		return (ARCHIVE_FATAL);
+	}
+	a->format_data = cpio;
+	a->format_name = "cpio";
+	a->format_options = archive_write_binary_options;
+	a->format_write_header = archive_write_binary_header;
+	a->format_write_data = archive_write_binary_data;
+	a->format_finish_entry = archive_write_binary_finish_entry;
+	a->format_close = archive_write_binary_close;
+	a->format_free = archive_write_binary_free;
+	a->archive.archive_format = format;
+	switch (format) {
+	case ARCHIVE_FORMAT_CPIO_PWB:
+		a->archive.archive_format_name = "PWB cpio";
+		break;
+	case ARCHIVE_FORMAT_CPIO_BIN_LE:
+		a->archive.archive_format_name = "7th Edition cpio";
+		break;
+	default:
+		archive_set_error(&a->archive, EINVAL, "binary format must be 'pwb' or 'bin'");
+		return (ARCHIVE_FATAL);
+	}
+	return (ARCHIVE_OK);
+}
+
+/*
+ * Set output format to PWB (6th Edition) binary format
+ */
+int
+archive_write_set_format_cpio_pwb(struct archive *_a)
+{
+	return archive_write_set_format_cpio_binary(_a, ARCHIVE_FORMAT_CPIO_PWB);
+}
+
+/*
+ * Set output format to 7th Edition binary format
+ */
+int
+archive_write_set_format_cpio_bin(struct archive *_a)
+{
+	return archive_write_set_format_cpio_binary(_a, ARCHIVE_FORMAT_CPIO_BIN_LE);
+}
+
+static int
+archive_write_binary_options(struct archive_write *a, const char *key,
+    const char *val)
+{
+	struct cpio *cpio = (struct cpio *)a->format_data;
+	int ret = ARCHIVE_FAILED;
+
+	if (strcmp(key, "hdrcharset")  == 0) {
+		if (val == NULL || val[0] == 0)
+			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+			    "%s: hdrcharset option needs a character-set name",
+			    a->format_name);
+		else {
+			cpio->opt_sconv = archive_string_conversion_to_charset(
+			    &a->archive, val, 0);
+			if (cpio->opt_sconv != NULL)
+				ret = ARCHIVE_OK;
+			else
+				ret = ARCHIVE_FATAL;
+		}
+		return (ret);
+	}
+
+	/* Note: The "warn" return is just to inform the options
+	 * supervisor that we didn't handle it.  It will generate
+	 * a suitable error if no one used this option. */
+	return (ARCHIVE_WARN);
+}
+
+/*
+ * Ino values are as long as 64 bits on some systems; cpio format
+ * only allows 16 bits and relies on the ino values to identify hardlinked
+ * files.  So, we can't merely "hash" the ino numbers since collisions
+ * would corrupt the archive.  Instead, we generate synthetic ino values
+ * to store in the archive and maintain a map of original ino values to
+ * synthetic ones so we can preserve hardlink information.
+ *
+ * TODO: Make this more efficient.  It's not as bad as it looks (most
+ * files don't have any hardlinks and we don't do any work here for those),
+ * but it wouldn't be hard to do better.
+ *
+ * TODO: Work with dev/ino pairs here instead of just ino values.
+ */
+static int
+synthesize_ino_value(struct cpio *cpio, struct archive_entry *entry)
+{
+	int64_t ino = archive_entry_ino64(entry);
+	int ino_new;
+	size_t i;
+
+	/*
+	 * If no index number was given, don't assign one.  In
+	 * particular, this handles the end-of-archive marker
+	 * correctly by giving it a zero index value.  (This is also
+	 * why we start our synthetic index numbers with one below.)
+	 */
+	if (ino == 0)
+		return (0);
+
+	/* Don't store a mapping if we don't need to. */
+	if (archive_entry_nlink(entry) < 2) {
+		return (int)(++cpio->ino_next);
+	}
+
+	/* Look up old ino; if we have it, this is a hardlink
+	 * and we reuse the same value. */
+	for (i = 0; i < cpio->ino_list_next; ++i) {
+		if (cpio->ino_list[i].old == ino)
+			return (cpio->ino_list[i].new);
+	}
+
+	/* Assign a new index number. */
+	ino_new = (int)(++cpio->ino_next);
+
+	/* Ensure space for the new mapping. */
+	if (cpio->ino_list_size <= cpio->ino_list_next) {
+		size_t newsize = cpio->ino_list_size < 512
+		    ? 512 : cpio->ino_list_size * 2;
+		void *newlist = realloc(cpio->ino_list,
+		    sizeof(cpio->ino_list[0]) * newsize);
+		if (newlist == NULL)
+			return (-1);
+
+		cpio->ino_list_size = newsize;
+		cpio->ino_list = newlist;
+	}
+
+	/* Record and return the new value. */
+	cpio->ino_list[cpio->ino_list_next].old = ino;
+	cpio->ino_list[cpio->ino_list_next].new = ino_new;
+	++cpio->ino_list_next;
+	return (ino_new);
+}
+
+
+static struct archive_string_conv *
+get_sconv(struct archive_write *a)
+{
+	struct cpio *cpio;
+	struct archive_string_conv *sconv;
+
+	cpio = (struct cpio *)a->format_data;
+	sconv = cpio->opt_sconv;
+	if (sconv == NULL) {
+		if (!cpio->init_default_conversion) {
+			cpio->sconv_default =
+			    archive_string_default_conversion_for_write(
+			      &(a->archive));
+			cpio->init_default_conversion = 1;
+		}
+		sconv = cpio->sconv_default;
+	}
+	return (sconv);
+}
+
+static int
+archive_write_binary_header(struct archive_write *a, struct archive_entry *entry)
+{
+	const char *path;
+	size_t len;
+
+	if (archive_entry_filetype(entry) == 0 && archive_entry_hardlink(entry) == NULL) {
+		archive_set_error(&a->archive, -1, "Filetype required");
+		return (ARCHIVE_FAILED);
+	}
+
+	if (archive_entry_pathname_l(entry, &path, &len, get_sconv(a)) != 0
+	    && errno == ENOMEM) {
+		archive_set_error(&a->archive, ENOMEM,
+		    "Can't allocate memory for Pathname");
+		return (ARCHIVE_FATAL);
+	}
+	if (len == 0 || path == NULL || path[0] == '\0') {
+		archive_set_error(&a->archive, -1, "Pathname required");
+		return (ARCHIVE_FAILED);
+	}
+
+	if (!archive_entry_size_is_set(entry) || archive_entry_size(entry) < 0) {
+		archive_set_error(&a->archive, -1, "Size required");
+		return (ARCHIVE_FAILED);
+	}
+	return write_header(a, entry);
+}
+
+static int
+write_header(struct archive_write *a, struct archive_entry *entry)
+{
+	struct cpio *cpio;
+	const char *p, *path;
+	int pathlength, ret, ret_final;
+	int64_t	ino;
+	struct cpio_binary_header h;
+	struct archive_string_conv *sconv;
+	struct archive_entry *entry_main;
+	size_t len;
+
+	cpio = (struct cpio *)a->format_data;
+	ret_final = ARCHIVE_OK;
+	sconv = get_sconv(a);
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	/* Make sure the path separators in pathname, hardlink and symlink
+	 * are all slash '/', not the Windows path separator '\'. */
+	entry_main = __la_win_entry_in_posix_pathseparator(entry);
+	if (entry_main == NULL) {
+		archive_set_error(&a->archive, ENOMEM,
+		    "Can't allocate ustar data");
+		return(ARCHIVE_FATAL);
+	}
+	if (entry != entry_main)
+		entry = entry_main;
+	else
+		entry_main = NULL;
+#else
+	entry_main = NULL;
+#endif
+
+	ret = archive_entry_pathname_l(entry, &path, &len, sconv);
+	if (ret != 0) {
+		if (errno == ENOMEM) {
+			archive_set_error(&a->archive, ENOMEM,
+			    "Can't allocate memory for Pathname");
+			ret_final = ARCHIVE_FATAL;
+			goto exit_write_header;
+		}
+		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
+		    "Can't translate pathname '%s' to %s",
+		    archive_entry_pathname(entry),
+		    archive_string_conversion_charset_name(sconv));
+		ret_final = ARCHIVE_WARN;
+	}
+	/* Include trailing null */
+	pathlength = (int)len + 1;
+
+	h.h_magic = swap16(070707);
+	h.h_dev = swap16(archive_entry_dev(entry));
+
+	ino = synthesize_ino_value(cpio, entry);
+	if (ino < 0) {
+		archive_set_error(&a->archive, ENOMEM,
+		    "No memory for ino translation table");
+		ret_final = ARCHIVE_FATAL;
+		goto exit_write_header;
+	} else if (ino > 077777) {
+		archive_set_error(&a->archive, ERANGE,
+		    "Too many files for this cpio format");
+		ret_final = ARCHIVE_FATAL;
+		goto exit_write_header;
+	}
+	h.h_ino = swap16(ino);
+
+	h.h_mode = archive_entry_mode(entry);
+	if (((h.h_mode & AE_IFMT) == AE_IFSOCK) || ((h.h_mode & AE_IFMT) == AE_IFIFO)) {
+		archive_set_error(&a->archive, EINVAL,
+				  "sockets and fifos cannot be represented in the binary cpio format");
+		ret_final = ARCHIVE_FATAL;
+		goto exit_write_header;
+	}
+	if (a->archive.archive_format == ARCHIVE_FORMAT_CPIO_PWB) {
+		if (((h.h_mode & AE_IFMT) == AE_IFLNK) || ((h.h_mode & AE_IFMT) == AE_IFREG))
+			h.h_mode &= (~AE_IFMT);
+	}
+	h.h_mode = swap16(h.h_mode);
+
+	h.h_uid = swap16(archive_entry_uid(entry));
+	h.h_gid = swap16(archive_entry_gid(entry));
+	h.h_nlink = swap16(archive_entry_nlink(entry));
+
+	if (archive_entry_filetype(entry) == AE_IFBLK
+	    || archive_entry_filetype(entry) == AE_IFCHR)
+		h.h_majmin = swap16(archive_entry_rdev(entry));
+	else
+		h.h_majmin = 0;
+
+	h.h_mtime = swap32(archive_entry_mtime(entry));
+	h.h_namesize = swap16(pathlength);
+
+	/* Non-regular files don't store bodies. */
+	if (archive_entry_filetype(entry) != AE_IFREG)
+		archive_entry_set_size(entry, 0);
+
+	/* Symlinks get the link written as the body of the entry. */
+	ret = archive_entry_symlink_l(entry, &p, &len, sconv);
+	if (ret != 0) {
+		if (errno == ENOMEM) {
+			archive_set_error(&a->archive, ENOMEM,
+			    "Can't allocate memory for Linkname");
+			ret_final = ARCHIVE_FATAL;
+			goto exit_write_header;
+		}
+		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
+		    "Can't translate linkname '%s' to %s",
+		    archive_entry_symlink(entry),
+		    archive_string_conversion_charset_name(sconv));
+		ret_final = ARCHIVE_WARN;
+	}
+
+	if (len > 0 && p != NULL  &&  *p != '\0') {
+		if (a->archive.archive_format == ARCHIVE_FORMAT_CPIO_PWB) {
+			archive_set_error(&a->archive, EINVAL,
+					  "symlinks are not supported by UNIX V6 or by PWB cpio");
+			ret_final = ARCHIVE_FATAL;
+			goto exit_write_header;
+		}
+		h.h_filesize = swap32(strlen(p)); /* symlink */
+	} else {
+		if ((a->archive.archive_format == ARCHIVE_FORMAT_CPIO_PWB) &&
+		    (archive_entry_size(entry) > 256*256*256-1)) {
+			archive_set_error(&a->archive, ERANGE,
+					  "File is too large for PWB binary cpio format.");
+			ret_final = ARCHIVE_FAILED;
+			goto exit_write_header;
+		} else if (archive_entry_size(entry) > INT32_MAX) {
+			archive_set_error(&a->archive, ERANGE,
+					  "File is too large for binary cpio format.");
+			ret_final = ARCHIVE_FAILED;
+			goto exit_write_header;
+		}
+		h.h_filesize = swap32(archive_entry_size(entry)); /* file */
+	}
+
+	ret = __archive_write_output(a, &h, HSIZE);
+	if (ret != ARCHIVE_OK) {
+		ret_final = ARCHIVE_FATAL;
+		goto exit_write_header;
+	}
+
+	ret = __archive_write_output(a, path, pathlength);
+	if ((ret == ARCHIVE_OK) && ((pathlength % 2) != 0))
+		ret = __archive_write_nulls(a, 1);
+	if (ret != ARCHIVE_OK) {
+		ret_final = ARCHIVE_FATAL;
+		goto exit_write_header;
+	}
+
+	cpio->entry_bytes_remaining = archive_entry_size(entry);
+	if ((cpio->entry_bytes_remaining % 2) != 0)
+		cpio->entry_bytes_remaining++;
+
+	/* Write the symlink now. */
+	if (p != NULL  &&  *p != '\0') {
+		ret = __archive_write_output(a, p, strlen(p));
+		if ((ret == ARCHIVE_OK) && ((strlen(p) % 2) != 0))
+			ret = __archive_write_nulls(a, 1);
+		if (ret != ARCHIVE_OK) {
+			ret_final = ARCHIVE_FATAL;
+			goto exit_write_header;
+		}
+	}
+	
+exit_write_header:
+	archive_entry_free(entry_main);
+	return (ret_final);
+}
+
+static ssize_t
+archive_write_binary_data(struct archive_write *a, const void *buff, size_t s)
+{
+	struct cpio *cpio;
+	int ret;
+
+	cpio = (struct cpio *)a->format_data;
+	if (s > cpio->entry_bytes_remaining)
+		s = (size_t)cpio->entry_bytes_remaining;
+
+	ret = __archive_write_output(a, buff, s);
+	cpio->entry_bytes_remaining -= s;
+	if (ret >= 0)
+		return (s);
+	else
+		return (ret);
+}
+
+static int
+archive_write_binary_close(struct archive_write *a)
+{
+	int er;
+	struct archive_entry *trailer;
+
+	trailer = archive_entry_new2(NULL);
+	/* nlink = 1 here for GNU cpio compat. */
+	archive_entry_set_nlink(trailer, 1);
+	archive_entry_set_size(trailer, 0);
+	archive_entry_set_pathname(trailer, "TRAILER!!!");
+	er = write_header(a, trailer);
+	archive_entry_free(trailer);
+	return (er);
+}
+
+static int
+archive_write_binary_free(struct archive_write *a)
+{
+	struct cpio *cpio;
+
+	cpio = (struct cpio *)a->format_data;
+	free(cpio->ino_list);
+	free(cpio);
+	a->format_data = NULL;
+	return (ARCHIVE_OK);
+}
+
+static int
+archive_write_binary_finish_entry(struct archive_write *a)
+{
+	struct cpio *cpio;
+
+	cpio = (struct cpio *)a->format_data;
+	return (__archive_write_nulls(a,
+		(size_t)cpio->entry_bytes_remaining));
+}