1 files changed, 344 insertions, 0 deletions

diff --git a/libarchive/archive_write_set_format_cpio.c b/libarchive/archive_write_set_format_cpio.c
new file mode 100644
index 0000000..4e8e1e0
--- /dev/null
+++ b/libarchive/archive_write_set_format_cpio.c
@@ -0,0 +1,344 @@
+/*-
+ * Copyright (c) 2003-2007 Tim Kientzle
+ * 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_private.h"
+#include "archive_write_private.h"
+
+static ssize_t	archive_write_cpio_data(struct archive_write *,
+		    const void *buff, size_t s);
+static int	archive_write_cpio_finish(struct archive_write *);
+static int	archive_write_cpio_destroy(struct archive_write *);
+static int	archive_write_cpio_finish_entry(struct archive_write *);
+static int	archive_write_cpio_header(struct archive_write *,
+		    struct archive_entry *);
+static int	format_octal(int64_t, void *, int);
+static int64_t	format_octal_recursive(int64_t, char *, int);
+
+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 cpio_header {
+	char	c_magic[6];
+	char	c_dev[6];
+	char	c_ino[6];
+	char	c_mode[6];
+	char	c_uid[6];
+	char	c_gid[6];
+	char	c_nlink[6];
+	char	c_rdev[6];
+	char	c_mtime[11];
+	char	c_namesize[6];
+	char	c_filesize[11];
+};
+
+/*
+ * Set output format to 'cpio' format.
+ */
+int
+archive_write_set_format_cpio(struct archive *_a)
+{
+	struct archive_write *a = (struct archive_write *)_a;
+	struct cpio *cpio;
+
+	/* If someone else was already registered, unregister them. */
+	if (a->format_destroy != NULL)
+		(a->format_destroy)(a);
+
+	cpio = (struct cpio *)malloc(sizeof(*cpio));
+	if (cpio == NULL) {
+		archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data");
+		return (ARCHIVE_FATAL);
+	}
+	memset(cpio, 0, sizeof(*cpio));
+	a->format_data = cpio;
+
+	a->pad_uncompressed = 1;
+	a->format_name = "cpio";
+	a->format_write_header = archive_write_cpio_header;
+	a->format_write_data = archive_write_cpio_data;
+	a->format_finish_entry = archive_write_cpio_finish_entry;
+	a->format_finish = archive_write_cpio_finish;
+	a->format_destroy = archive_write_cpio_destroy;
+	a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
+	a->archive.archive_format_name = "POSIX cpio";
+	return (ARCHIVE_OK);
+}
+
+/*
+ * Ino values are as long as 64 bits on some systems; cpio format
+ * only allows 18 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 ++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 = ++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 int
+archive_write_cpio_header(struct archive_write *a, struct archive_entry *entry)
+{
+	struct cpio *cpio;
+	const char *p, *path;
+	int pathlength, ret, ret2;
+	int64_t	ino;
+	struct cpio_header	 h;
+
+	cpio = (struct cpio *)a->format_data;
+	ret2 = ARCHIVE_OK;
+
+	path = archive_entry_pathname(entry);
+	pathlength = (int)strlen(path) + 1; /* Include trailing null. */
+
+	memset(&h, 0, sizeof(h));
+	format_octal(070707, &h.c_magic, sizeof(h.c_magic));
+	format_octal(archive_entry_dev(entry), &h.c_dev, sizeof(h.c_dev));
+
+	ino = synthesize_ino_value(cpio, entry);
+	if (ino < 0) {
+		archive_set_error(&a->archive, ENOMEM,
+		    "No memory for ino translation table");
+		return (ARCHIVE_FATAL);
+	} else if (ino > 0777777) {
+		archive_set_error(&a->archive, ERANGE,
+		    "Too many files for this cpio format");
+		return (ARCHIVE_FATAL);
+	}
+	format_octal(ino & 0777777, &h.c_ino, sizeof(h.c_ino));
+
+	format_octal(archive_entry_mode(entry), &h.c_mode, sizeof(h.c_mode));
+	format_octal(archive_entry_uid(entry), &h.c_uid, sizeof(h.c_uid));
+	format_octal(archive_entry_gid(entry), &h.c_gid, sizeof(h.c_gid));
+	format_octal(archive_entry_nlink(entry), &h.c_nlink, sizeof(h.c_nlink));
+	if (archive_entry_filetype(entry) == AE_IFBLK
+	    || archive_entry_filetype(entry) == AE_IFCHR)
+	    format_octal(archive_entry_dev(entry), &h.c_rdev, sizeof(h.c_rdev));
+	else
+	    format_octal(0, &h.c_rdev, sizeof(h.c_rdev));
+	format_octal(archive_entry_mtime(entry), &h.c_mtime, sizeof(h.c_mtime));
+	format_octal(pathlength, &h.c_namesize, sizeof(h.c_namesize));
+
+	/* 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. */
+	p = archive_entry_symlink(entry);
+	if (p != NULL  &&  *p != '\0')
+		format_octal(strlen(p), &h.c_filesize, sizeof(h.c_filesize));
+	else
+		format_octal(archive_entry_size(entry),
+		    &h.c_filesize, sizeof(h.c_filesize));
+
+	ret = (a->compressor.write)(a, &h, sizeof(h));
+	if (ret != ARCHIVE_OK)
+		return (ARCHIVE_FATAL);
+
+	ret = (a->compressor.write)(a, path, pathlength);
+	if (ret != ARCHIVE_OK)
+		return (ARCHIVE_FATAL);
+
+	cpio->entry_bytes_remaining = archive_entry_size(entry);
+
+	/* Write the symlink now. */
+	if (p != NULL  &&  *p != '\0')
+		ret = (a->compressor.write)(a, p, strlen(p));
+
+	if (ret == ARCHIVE_OK)
+		ret = ret2;
+	return (ret);
+}
+
+static ssize_t
+archive_write_cpio_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 = cpio->entry_bytes_remaining;
+
+	ret = (a->compressor.write)(a, buff, s);
+	cpio->entry_bytes_remaining -= s;
+	if (ret >= 0)
+		return (s);
+	else
+		return (ret);
+}
+
+/*
+ * Format a number into the specified field.
+ */
+static int
+format_octal(int64_t v, void *p, int digits)
+{
+	int64_t	max;
+	int	ret;
+
+	max = (((int64_t)1) << (digits * 3)) - 1;
+	if (v >= 0  &&  v <= max) {
+	    format_octal_recursive(v, (char *)p, digits);
+	    ret = 0;
+	} else {
+	    format_octal_recursive(max, (char *)p, digits);
+	    ret = -1;
+	}
+	return (ret);
+}
+
+static int64_t
+format_octal_recursive(int64_t v, char *p, int s)
+{
+	if (s == 0)
+		return (v);
+	v = format_octal_recursive(v, p+1, s-1);
+	*p = '0' + (v & 7);
+	return (v >> 3);
+}
+
+static int
+archive_write_cpio_finish(struct archive_write *a)
+{
+	int er;
+	struct archive_entry *trailer;
+
+	trailer = archive_entry_new();
+	/* nlink = 1 here for GNU cpio compat. */
+	archive_entry_set_nlink(trailer, 1);
+	archive_entry_set_pathname(trailer, "TRAILER!!!");
+	er = archive_write_cpio_header(a, trailer);
+	archive_entry_free(trailer);
+	return (er);
+}
+
+static int
+archive_write_cpio_destroy(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_cpio_finish_entry(struct archive_write *a)
+{
+	struct cpio *cpio;
+	size_t to_write;
+	int ret;
+
+	cpio = (struct cpio *)a->format_data;
+	ret = ARCHIVE_OK;
+	while (cpio->entry_bytes_remaining > 0) {
+		to_write = cpio->entry_bytes_remaining < a->null_length ?
+		    cpio->entry_bytes_remaining : a->null_length;
+		ret = (a->compressor.write)(a, a->nulls, to_write);
+		if (ret != ARCHIVE_OK)
+			return (ret);
+		cpio->entry_bytes_remaining -= to_write;
+	}
+	return (ret);
+}