Initial import of libarchive.

What it is:
   A library for reading and writing various streaming archive
   formats, especially tar and cpio.  Being a library, it should
   be easy to incorporate into pkg_* tools, sysinstall, and any
   other place that needs to read or write such archives.

Features:
  * Full automatic detection of both compression and archive format.
  * Extensible internal architecture to make it easy to add new formats.
  * Support for "pax interchange format," a new POSIX-standard tar format
    that eliminates essentially all of the restrictions of historic formats.
  * BSD license

Thanks to: jkh for pushing me to start this work, gordon for
  encouraging me to commit it, bde for answering endless style
  questions, and many others for feedback and encouragement.

Status: Pretty good overall, though there are still a few rough edges and
  the library could always use more testing.  Feedback eagerly solicited.

1 files changed, 220 insertions, 0 deletions

diff --git a/lib/libarchive/archive_write.c b/lib/libarchive/archive_write.c
new file mode 100644
index 0000000..cd8434e
--- /dev/null
+++ b/lib/libarchive/archive_write.c
@@ -0,0 +1,220 @@
+/*-
+ * Copyright (c) 2003-2004 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
+ *    in this position and unchanged.
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * This file contains the "essential" portions of the write API, that
+ * is, stuff that will essentially always be used by any client that
+ * actually needs to write a archive.  Optional pieces have been, as
+ * far as possible, separated out into separate files to reduce
+ * needlessly bloating statically-linked clients.
+ */
+
+#include <sys/errno.h>
+#include <sys/wait.h>
+#ifdef DMALLOC
+#include <dmalloc.h>
+#endif
+#include <limits.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <tar.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "archive.h"
+#include "archive_private.h"
+
+extern char		**environ;
+
+/*
+ * Allocate, initialize and return an archive object.
+ */
+struct archive *
+archive_write_new(void)
+{
+	struct archive *a;
+	char *nulls;
+
+	a = malloc(sizeof(*a));
+	if (a == NULL)
+		return (NULL);
+	memset(a, 0, sizeof(*a));
+	a->magic = ARCHIVE_WRITE_MAGIC;
+	a->user_uid = geteuid();
+	a->bytes_per_block = ARCHIVE_DEFAULT_BYTES_PER_BLOCK;
+	a->bytes_in_last_block = -1;	/* Default */
+	a->state = ARCHIVE_STATE_NEW;
+	a->pformat_data = &(a->format_data);
+
+	/* Initialize a block of nulls for padding purposes. */
+	a->null_length = 1024;
+	nulls = malloc(a->null_length);
+	if (nulls == NULL) {
+		free(a);
+		return (NULL);
+	}
+	memset(nulls, 0, a->null_length);
+	a->nulls = nulls;
+	/*
+	 * Set default compression, but don't set a default format.
+	 * Were we to set a default format here, we would force every
+	 * client to link in support for that format, even if they didn't
+	 * ever use it.
+	 */
+	archive_write_set_compression_none(a);
+	return (a);
+}
+
+
+/*
+ * Set the block size.  Returns 0 if successful.
+ */
+int
+archive_write_set_bytes_per_block(struct archive *a, int bytes_per_block)
+{
+	archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW);
+	a->bytes_per_block = bytes_per_block;
+	return (ARCHIVE_OK);
+}
+
+
+/*
+ * Set the size for the last block.
+ * Returns 0 if successful.
+ */
+int
+archive_write_set_bytes_in_last_block(struct archive *a, int bytes)
+{
+	archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_ANY);
+	a->bytes_in_last_block = bytes;
+	return (ARCHIVE_OK);
+}
+
+
+/*
+ * Open the archive using the current settings.
+ */
+int
+archive_write_open(struct archive *a, void *client_data,
+    archive_open_callback *opener, archive_write_callback *writer,
+    archive_close_callback *closer)
+{
+	int ret;
+
+	ret = ARCHIVE_OK;
+	archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW);
+	a->state = ARCHIVE_STATE_HEADER;
+	a->client_data = client_data;
+	a->client_writer = writer;
+	a->client_opener = opener;
+	a->client_closer = closer;
+	ret = (a->compression_init)(a);
+	if (a->format_init && ret == ARCHIVE_OK)
+		ret = (a->format_init)(a);
+	return (ret);
+}
+
+
+/*
+ * Cleanup and free the archive object.
+ *
+ * Be careful: user might just call write_new and then write_finish.
+ * Don't assume we actually wrote anything or performed any non-trivial
+ * initialization.
+ */
+void
+archive_write_finish(struct archive *a)
+{
+	archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_ANY);
+
+	/* Finish the last entry. */
+	if (a->state & ARCHIVE_STATE_DATA)
+		((a->format_finish_entry)(a));
+
+	/* Finish off the archive. */
+	if (a->format_finish != NULL)
+		(a->format_finish)(a);
+
+	/* Finish the compression and close the stream. */
+	if (a->compression_finish != NULL)
+		(a->compression_finish)(a);
+
+	/* Release various dynamic buffers. */
+	free((void *)(uintptr_t)(const void *)a->nulls);
+	if (a->entry_name.s != NULL)
+		free(a->entry_name.s);
+	if (a->entry_linkname.s != NULL)
+		free(a->entry_linkname.s);
+	if (a->entry_uname.s != NULL)
+		free(a->entry_uname.s);
+	if (a->entry_gname.s != NULL)
+		free(a->entry_gname.s);
+	if (a->gnu_name.s != NULL)
+		free(a->gnu_name.s);
+	if (a->gnu_linkname.s != NULL)
+		free(a->gnu_linkname.s);
+	if (a->extract_mkdirpath.s != NULL)
+		free(a->extract_mkdirpath.s);
+	free(a);
+}
+
+
+/*
+ * Write the appropriate header.
+ */
+int
+archive_write_header(struct archive *a, struct archive_entry *entry)
+{
+	int ret;
+
+	archive_check_magic(a, ARCHIVE_WRITE_MAGIC,
+	    ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA);
+
+	/* Finish last entry. */
+	if (a->state & ARCHIVE_STATE_DATA)
+		((a->format_finish_entry)(a));
+
+	/* Format and write header. */
+	ret = ((a->format_write_header)(a, entry));
+
+	a->state = ARCHIVE_STATE_DATA;
+	return (ret);
+}
+
+/*
+ * Note that the compressor is responsible for blocking.
+ */
+int
+archive_write_data(struct archive *a, const void *buff, size_t s)
+{
+	archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_DATA);
+	return (a->format_write_data(a, buff, s));
+}