libarchive/archive_write.c - third_party/libarchive - Git at Google

 /*-
  * 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: src/lib/libarchive/archive_write.c,v 1.27 2008/03/14 23:09:02 kientzle Exp $");

 /*
  * 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.
  */

 #ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
 #endif
 #ifdef HAVE_LIMITS_H
 #include <limits.h>
 #endif
 #include <stdio.h>
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
 #include <time.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif

 #include "archive.h"
 #include "archive_entry.h"
 #include "archive_private.h"
 #include "archive_write_private.h"

 static struct archive_vtable *archive_write_vtable(void);

 static int	_archive_write_close(struct archive *);
 static int	_archive_write_finish(struct archive *);
 static int	_archive_write_header(struct archive *, struct archive_entry *);
 static int	_archive_write_finish_entry(struct archive *);
 static ssize_t	_archive_write_data(struct archive *, const void *, size_t);

 static struct archive_vtable *
 archive_write_vtable(void)
 {
 	static struct archive_vtable av;
 	static int inited = 0;

 	if (!inited) {
 		av.archive_close = _archive_write_close;
 		av.archive_finish = _archive_write_finish;
 		av.archive_write_header = _archive_write_header;
 		av.archive_write_finish_entry = _archive_write_finish_entry;
 		av.archive_write_data = _archive_write_data;
 	}
 	return (&av);
 }

 /*
  * Allocate, initialize and return an archive object.
  */
 struct archive *
 archive_write_new(void)
 {
 	struct archive_write *a;
 	unsigned char *nulls;

 	a = (struct archive_write *)malloc(sizeof(*a));
 	if (a == NULL)
 		return (NULL);
 	memset(a, 0, sizeof(*a));
 	a->archive.magic = ARCHIVE_WRITE_MAGIC;
 	a->archive.state = ARCHIVE_STATE_NEW;
 	a->archive.vtable = archive_write_vtable();
 	/*
 	 * The value 10240 here matches the traditional tar default,
 	 * but is otherwise arbitrary.
 	 * TODO: Set the default block size from the format selected.
 	 */
 	a->bytes_per_block = 10240;
 	a->bytes_in_last_block = -1;	/* Default */

 	/* Initialize a block of nulls for padding purposes. */
 	a->null_length = 1024;
 	nulls = (unsigned char *)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->archive);
 	return (&a->archive);
 }

 /*
  * Set write options for the format. Returns 0 if successful.
  */
 int
 archive_write_set_format_options(struct archive *_a, const char *s)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	char key[64], val[64];
 	int len, r, ret = ARCHIVE_OK;

 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_NEW, "archive_write_set_format_options");
 	archive_clear_error(&a->archive);

 	if (s == NULL || *s == '\0')
 		return (ARCHIVE_OK);
 	if (a->format_options == NULL)
 		/* This format does not support option. */
 		return (ARCHIVE_OK);

 	while ((len = __archive_parse_options(s, a->format_name,
 	    sizeof(key), key, sizeof(val), val)) > 0) {
 		if (val[0] == '\0')
 			r = a->format_options(a, key, NULL);
 		else
 			r = a->format_options(a, key, val);
 		if (r == ARCHIVE_FATAL)
 			return (r);
 		if (r < ARCHIVE_OK) { /* This key was not handled. */
 			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 			    "Unsupported option ``%s''", key);
 			ret = ARCHIVE_WARN;
 		}
 		s += len;
 	}
 	if (len < 0) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 		    "Malformed options string.");
 		return (ARCHIVE_WARN);
 	}
 	return (ret);
 }

 /*
  * Set write options for the compressor. Returns 0 if successful.
  */
 int
 archive_write_set_compressor_options(struct archive *_a, const char *s)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	char key[64], val[64];
 	int len, r;
 	int ret = ARCHIVE_OK;

 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_NEW, "archive_write_set_compressor_options");
 	archive_clear_error(&a->archive);

 	if (s == NULL || *s == '\0')
 		return (ARCHIVE_OK);
 	if (a->compressor.options == NULL) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 		    "Unsupported option ``%s''", s);
 		/* This compressor does not support option. */
 		return (ARCHIVE_WARN);
 	}

 	while ((len = __archive_parse_options(s, a->archive.compression_name,
 	    sizeof(key), key, sizeof(val), val)) > 0) {
 		if (val[0] == '\0')
 			r = a->compressor.options(a, key, NULL);
 		else
 			r = a->compressor.options(a, key, val);
 		if (r == ARCHIVE_FATAL)
 			return (r);
 		if (r < ARCHIVE_OK) {
 			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 			    "Unsupported option ``%s''", key);
 			ret = ARCHIVE_WARN;
 		}
 		s += len;
 	}
 	if (len < 0) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 		    "Illegal format options.");
 		return (ARCHIVE_WARN);
 	}
 	return (ret);
 }

 /*
  * Set write options for the format and the compressor. Returns 0 if successful.
  */
 int
 archive_write_set_options(struct archive *_a, const char *s)
 {
 	int r1, r2;

 	r1 = archive_write_set_format_options(_a, s);
 	if (r1 < ARCHIVE_WARN)
 		return (r1);
 	r2 = archive_write_set_compressor_options(_a, s);
 	if (r2 < ARCHIVE_WARN)
 		return (r2);
 	if (r1 == ARCHIVE_WARN && r2 == ARCHIVE_WARN)
 		return (ARCHIVE_WARN);
 	return (ARCHIVE_OK);
 }

 /*
  * Set the block size.  Returns 0 if successful.
  */
 int
 archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");
 	a->bytes_per_block = bytes_per_block;
 	return (ARCHIVE_OK);
 }

 /*
  * Get the current block size.  -1 if it has never been set.
  */
 int
 archive_write_get_bytes_per_block(struct archive *_a)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
 	return (a->bytes_per_block);
 }

 /*
  * Set the size for the last block.
  * Returns 0 if successful.
  */
 int
 archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
 	a->bytes_in_last_block = bytes;
 	return (ARCHIVE_OK);
 }

 /*
  * Return the value set above.  -1 indicates it has not been set.
  */
 int
 archive_write_get_bytes_in_last_block(struct archive *_a)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
 	return (a->bytes_in_last_block);
 }


 /*
  * dev/ino of a file to be rejected.  Used to prevent adding
  * an archive to itself recursively.
  */
 int
 archive_write_set_skip_file(struct archive *_a, dev_t d, ino_t i)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
 	a->skip_file_dev = d;
 	a->skip_file_ino = i;
 	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)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	int ret;

 	ret = ARCHIVE_OK;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_NEW, "archive_write_open");
 	archive_clear_error(&a->archive);
 	a->archive.state = ARCHIVE_STATE_HEADER;
 	a->client_data = client_data;
 	a->client_writer = writer;
 	a->client_opener = opener;
 	a->client_closer = closer;
 	ret = (a->compressor.init)(a);
 	if (a->format_init && ret == ARCHIVE_OK)
 		ret = (a->format_init)(a);
 	return (ret);
 }


 /*
  * Close out the archive.
  *
  * 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.
  */
 static int
 _archive_write_close(struct archive *_a)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	int r = ARCHIVE_OK, r1 = ARCHIVE_OK;

 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_ANY, "archive_write_close");

 	/* Finish the last entry. */
 	if (a->archive.state & ARCHIVE_STATE_DATA)
 		r = ((a->format_finish_entry)(a));

 	/* Finish off the archive. */
 	if (a->format_finish != NULL) {
 		r1 = (a->format_finish)(a);
 		if (r1 < r)
 			r = r1;
 	}

 	/* Release format resources. */
 	if (a->format_destroy != NULL) {
 		r1 = (a->format_destroy)(a);
 		if (r1 < r)
 			r = r1;
 	}

 	/* Finish the compression and close the stream. */
 	if (a->compressor.finish != NULL) {
 		r1 = (a->compressor.finish)(a);
 		if (r1 < r)
 			r = r1;
 	}

 	/* Close out the client stream. */
 	if (a->client_closer != NULL) {
 		r1 = (a->client_closer)(&a->archive, a->client_data);
 		if (r1 < r)
 			r = r1;
 	}

 	a->archive.state = ARCHIVE_STATE_CLOSED;
 	return (r);
 }

 /*
  * Destroy the archive structure.
  */
 static int
 _archive_write_finish(struct archive *_a)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	int r = ARCHIVE_OK;

 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_ANY, "archive_write_finish");
 	if (a->archive.state != ARCHIVE_STATE_CLOSED)
 		r = archive_write_close(&a->archive);

 	/* Release various dynamic buffers. */
 	free((void *)(uintptr_t)(const void *)a->nulls);
 	archive_string_free(&a->archive.error_string);
 	a->archive.magic = 0;
 	free(a);
 	return (r);
 }

 /*
  * Write the appropriate header.
  */
 static int
 _archive_write_header(struct archive *_a, struct archive_entry *entry)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	int ret, r2;

 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header");
 	archive_clear_error(&a->archive);

 	/* In particular, "retry" and "fatal" get returned immediately. */
 	ret = archive_write_finish_entry(&a->archive);
 	if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
 		return (ret);

 	if (a->skip_file_dev != 0 &&
 	    archive_entry_dev(entry) == a->skip_file_dev &&
 	    a->skip_file_ino != 0 &&
 	    archive_entry_ino(entry) == a->skip_file_ino) {
 		archive_set_error(&a->archive, 0,
 		    "Can't add archive to itself");
 		return (ARCHIVE_FAILED);
 	}

 	/* Format and write header. */
 	r2 = ((a->format_write_header)(a, entry));
 	if (r2 < ret)
 		ret = r2;

 	a->archive.state = ARCHIVE_STATE_DATA;
 	return (ret);
 }

 static int
 _archive_write_finish_entry(struct archive *_a)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	int ret = ARCHIVE_OK;

 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
 	    "archive_write_finish_entry");
 	if (a->archive.state & ARCHIVE_STATE_DATA)
 		ret = (a->format_finish_entry)(a);
 	a->archive.state = ARCHIVE_STATE_HEADER;
 	return (ret);
 }

 /*
  * Note that the compressor is responsible for blocking.
  */
 static ssize_t
 _archive_write_data(struct archive *_a, const void *buff, size_t s)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_DATA, "archive_write_data");
 	archive_clear_error(&a->archive);
 	return ((a->format_write_data)(a, buff, s));
 }
	/*-
	* 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: src/lib/libarchive/archive_write.c,v 1.27 2008/03/14 23:09:02 kientzle Exp $");

	/*
	* 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.
	*/

	#ifdef HAVE_SYS_WAIT_H
	#include <sys/wait.h>
	#endif
	#ifdef HAVE_LIMITS_H
	#include <limits.h>
	#endif
	#include <stdio.h>
	#ifdef HAVE_STDLIB_H
	#include <stdlib.h>
	#endif
	#ifdef HAVE_STRING_H
	#include <string.h>
	#endif
	#include <time.h>
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif

	#include "archive.h"
	#include "archive_entry.h"
	#include "archive_private.h"
	#include "archive_write_private.h"

	static struct archive_vtable *archive_write_vtable(void);

	static int _archive_write_close(struct archive *);
	static int _archive_write_finish(struct archive *);
	static int _archive_write_header(struct archive , struct archive_entry );
	static int _archive_write_finish_entry(struct archive *);
	static ssize_t _archive_write_data(struct archive , const void , size_t);

	static struct archive_vtable *
	archive_write_vtable(void)
	{
	static struct archive_vtable av;
	static int inited = 0;

	if (!inited) {
	av.archive_close = _archive_write_close;
	av.archive_finish = _archive_write_finish;
	av.archive_write_header = _archive_write_header;
	av.archive_write_finish_entry = _archive_write_finish_entry;
	av.archive_write_data = _archive_write_data;
	}
	return (&av);
	}

	/*
	* Allocate, initialize and return an archive object.
	*/
	struct archive *
	archive_write_new(void)
	{
	struct archive_write *a;
	unsigned char *nulls;

	a = (struct archive_write )malloc(sizeof(a));
	if (a == NULL)
	return (NULL);
	memset(a, 0, sizeof(*a));
	a->archive.magic = ARCHIVE_WRITE_MAGIC;
	a->archive.state = ARCHIVE_STATE_NEW;
	a->archive.vtable = archive_write_vtable();
	/*
	* The value 10240 here matches the traditional tar default,
	* but is otherwise arbitrary.
	* TODO: Set the default block size from the format selected.
	*/
	a->bytes_per_block = 10240;
	a->bytes_in_last_block = -1; /* Default */

	/* Initialize a block of nulls for padding purposes. */
	a->null_length = 1024;
	nulls = (unsigned char *)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->archive);
	return (&a->archive);
	}

	/*
	* Set write options for the format. Returns 0 if successful.
	*/
	int
	archive_write_set_format_options(struct archive _a, const char s)
	{
	struct archive_write a = (struct archive_write )_a;
	char key[64], val[64];
	int len, r, ret = ARCHIVE_OK;

	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_NEW, "archive_write_set_format_options");
	archive_clear_error(&a->archive);

	if (s == NULL \|\| *s == '\0')
	return (ARCHIVE_OK);
	if (a->format_options == NULL)
	/* This format does not support option. */
	return (ARCHIVE_OK);

	while ((len = __archive_parse_options(s, a->format_name,
	sizeof(key), key, sizeof(val), val)) > 0) {
	if (val[0] == '\0')
	r = a->format_options(a, key, NULL);
	else
	r = a->format_options(a, key, val);
	if (r == ARCHIVE_FATAL)
	return (r);
	if (r < ARCHIVE_OK) { /* This key was not handled. */
	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
	"Unsupported option ``%s''", key);
	ret = ARCHIVE_WARN;
	}
	s += len;
	}
	if (len < 0) {
	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
	"Malformed options string.");
	return (ARCHIVE_WARN);
	}
	return (ret);
	}

	/*
	* Set write options for the compressor. Returns 0 if successful.
	*/
	int
	archive_write_set_compressor_options(struct archive _a, const char s)
	{
	struct archive_write a = (struct archive_write )_a;
	char key[64], val[64];
	int len, r;
	int ret = ARCHIVE_OK;

	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_NEW, "archive_write_set_compressor_options");
	archive_clear_error(&a->archive);

	if (s == NULL \|\| *s == '\0')
	return (ARCHIVE_OK);
	if (a->compressor.options == NULL) {
	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
	"Unsupported option ``%s''", s);
	/* This compressor does not support option. */
	return (ARCHIVE_WARN);
	}

	while ((len = __archive_parse_options(s, a->archive.compression_name,
	sizeof(key), key, sizeof(val), val)) > 0) {
	if (val[0] == '\0')
	r = a->compressor.options(a, key, NULL);
	else
	r = a->compressor.options(a, key, val);
	if (r == ARCHIVE_FATAL)
	return (r);
	if (r < ARCHIVE_OK) {
	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
	"Unsupported option ``%s''", key);
	ret = ARCHIVE_WARN;
	}
	s += len;
	}
	if (len < 0) {
	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
	"Illegal format options.");
	return (ARCHIVE_WARN);
	}
	return (ret);
	}

	/*
	* Set write options for the format and the compressor. Returns 0 if successful.
	*/
	int
	archive_write_set_options(struct archive _a, const char s)
	{
	int r1, r2;

	r1 = archive_write_set_format_options(_a, s);
	if (r1 < ARCHIVE_WARN)
	return (r1);
	r2 = archive_write_set_compressor_options(_a, s);
	if (r2 < ARCHIVE_WARN)
	return (r2);
	if (r1 == ARCHIVE_WARN && r2 == ARCHIVE_WARN)
	return (ARCHIVE_WARN);
	return (ARCHIVE_OK);
	}

	/*
	* Set the block size. Returns 0 if successful.
	*/
	int
	archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
	{
	struct archive_write a = (struct archive_write )_a;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");
	a->bytes_per_block = bytes_per_block;
	return (ARCHIVE_OK);
	}

	/*
	* Get the current block size. -1 if it has never been set.
	*/
	int
	archive_write_get_bytes_per_block(struct archive *_a)
	{
	struct archive_write a = (struct archive_write )_a;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
	return (a->bytes_per_block);
	}

	/*
	* Set the size for the last block.
	* Returns 0 if successful.
	*/
	int
	archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
	{
	struct archive_write a = (struct archive_write )_a;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
	a->bytes_in_last_block = bytes;
	return (ARCHIVE_OK);
	}

	/*
	* Return the value set above. -1 indicates it has not been set.
	*/
	int
	archive_write_get_bytes_in_last_block(struct archive *_a)
	{
	struct archive_write a = (struct archive_write )_a;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
	return (a->bytes_in_last_block);
	}


	/*
	* dev/ino of a file to be rejected. Used to prevent adding
	* an archive to itself recursively.
	*/
	int
	archive_write_set_skip_file(struct archive *_a, dev_t d, ino_t i)
	{
	struct archive_write a = (struct archive_write )_a;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
	a->skip_file_dev = d;
	a->skip_file_ino = i;
	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)
	{
	struct archive_write a = (struct archive_write )_a;
	int ret;

	ret = ARCHIVE_OK;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_NEW, "archive_write_open");
	archive_clear_error(&a->archive);
	a->archive.state = ARCHIVE_STATE_HEADER;
	a->client_data = client_data;
	a->client_writer = writer;
	a->client_opener = opener;
	a->client_closer = closer;
	ret = (a->compressor.init)(a);
	if (a->format_init && ret == ARCHIVE_OK)
	ret = (a->format_init)(a);
	return (ret);
	}


	/*
	* Close out the archive.
	*
	* 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.
	*/
	static int
	_archive_write_close(struct archive *_a)
	{
	struct archive_write a = (struct archive_write )_a;
	int r = ARCHIVE_OK, r1 = ARCHIVE_OK;

	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_ANY, "archive_write_close");

	/* Finish the last entry. */
	if (a->archive.state & ARCHIVE_STATE_DATA)
	r = ((a->format_finish_entry)(a));

	/* Finish off the archive. */
	if (a->format_finish != NULL) {
	r1 = (a->format_finish)(a);
	if (r1 < r)
	r = r1;
	}

	/* Release format resources. */
	if (a->format_destroy != NULL) {
	r1 = (a->format_destroy)(a);
	if (r1 < r)
	r = r1;
	}

	/* Finish the compression and close the stream. */
	if (a->compressor.finish != NULL) {
	r1 = (a->compressor.finish)(a);
	if (r1 < r)
	r = r1;
	}

	/* Close out the client stream. */
	if (a->client_closer != NULL) {
	r1 = (a->client_closer)(&a->archive, a->client_data);
	if (r1 < r)
	r = r1;
	}

	a->archive.state = ARCHIVE_STATE_CLOSED;
	return (r);
	}

	/*
	* Destroy the archive structure.
	*/
	static int
	_archive_write_finish(struct archive *_a)
	{
	struct archive_write a = (struct archive_write )_a;
	int r = ARCHIVE_OK;

	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_ANY, "archive_write_finish");
	if (a->archive.state != ARCHIVE_STATE_CLOSED)
	r = archive_write_close(&a->archive);

	/* Release various dynamic buffers. */
	free((void )(uintptr_t)(const void )a->nulls);
	archive_string_free(&a->archive.error_string);
	a->archive.magic = 0;
	free(a);
	return (r);
	}

	/*
	* Write the appropriate header.
	*/
	static int
	_archive_write_header(struct archive _a, struct archive_entry entry)
	{
	struct archive_write a = (struct archive_write )_a;
	int ret, r2;

	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_DATA \| ARCHIVE_STATE_HEADER, "archive_write_header");
	archive_clear_error(&a->archive);

	/* In particular, "retry" and "fatal" get returned immediately. */
	ret = archive_write_finish_entry(&a->archive);
	if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
	return (ret);

	if (a->skip_file_dev != 0 &&
	archive_entry_dev(entry) == a->skip_file_dev &&
	a->skip_file_ino != 0 &&
	archive_entry_ino(entry) == a->skip_file_ino) {
	archive_set_error(&a->archive, 0,
	"Can't add archive to itself");
	return (ARCHIVE_FAILED);
	}

	/* Format and write header. */
	r2 = ((a->format_write_header)(a, entry));
	if (r2 < ret)
	ret = r2;

	a->archive.state = ARCHIVE_STATE_DATA;
	return (ret);
	}

	static int
	_archive_write_finish_entry(struct archive *_a)
	{
	struct archive_write a = (struct archive_write )_a;
	int ret = ARCHIVE_OK;

	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_HEADER \| ARCHIVE_STATE_DATA,
	"archive_write_finish_entry");
	if (a->archive.state & ARCHIVE_STATE_DATA)
	ret = (a->format_finish_entry)(a);
	a->archive.state = ARCHIVE_STATE_HEADER;
	return (ret);
	}

	/*
	* Note that the compressor is responsible for blocking.
	*/
	static ssize_t
	_archive_write_data(struct archive _a, const void buff, size_t s)
	{
	struct archive_write a = (struct archive_write )_a;
	__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_DATA, "archive_write_data");
	archive_clear_error(&a->archive);
	return ((a->format_write_data)(a, buff, s));
	}