/*-

 * 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_read_support_format_empty.c 191524 2009-04-26 18:24:14Z kientzle $");

#include "archive.h"

#include "archive_entry.h"

#include "archive_private.h"

#include "archive_read_private.h"

static int	archive_read_format_empty_bid(struct archive_read *, int);

static int	archive_read_format_empty_read_data(struct archive_read *,

		    const void **, size_t *, int64_t *);

static int	archive_read_format_empty_read_header(struct archive_read *,

		    struct archive_entry *);

int

archive_read_support_format_empty(struct archive *_a)

{

	struct archive_read *a = (struct archive_read *)_a;

	int r;

	archive_check_magic(_a, ARCHIVE_READ_MAGIC,

	    ARCHIVE_STATE_NEW, "archive_read_support_format_empty");

	r = __archive_read_register_format(a,

	    NULL,

	    NULL,

	    archive_read_format_empty_bid,

	    NULL,

	    archive_read_format_empty_read_header,

	    archive_read_format_empty_read_data,

	    NULL,

	    NULL,

	    NULL,

	    NULL,

	    NULL);

	return (r);

}

static int

archive_read_format_empty_bid(struct archive_read *a, int best_bid)

{

	if (best_bid < 1 && __archive_read_ahead(a, 1, NULL) == NULL)

		return (1);

	return (-1);

}

static int

archive_read_format_empty_read_header(struct archive_read *a,

    struct archive_entry *entry)

{

	(void)a; /* UNUSED */

	(void)entry; /* UNUSED */

	a->archive.archive_format = ARCHIVE_FORMAT_EMPTY;

	a->archive.archive_format_name = "Empty file";

	return (ARCHIVE_EOF);

}

static int

archive_read_format_empty_read_data(struct archive_read *a,

    const void **buff, size_t *size, int64_t *offset)

{

	(void)a; /* UNUSED */

	(void)buff; /* UNUSED */

	(void)size; /* UNUSED */

	(void)offset; /* UNUSED */

	return (ARCHIVE_EOF);

}