/*-

 * 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_open_memory.c,v 1.3 2007/01/09 08:05:56 kientzle Exp $");

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include "archive.h"

struct write_memory_data {

	size_t	used;

	size_t  size;

	size_t * client_size;

	unsigned char * buff;

};

static int	memory_write_close(struct archive *, void *);

static int	memory_write_open(struct archive *, void *);

static ssize_t	memory_write(struct archive *, void *, const void *buff, size_t);

/*

 * Client provides a pointer to a block of memory to receive

 * the data.  The 'size' param both tells us the size of the

 * client buffer and lets us tell the client the final size.

 */

int

archive_write_open_memory(struct archive *a, void *buff, size_t buffSize, size_t *used)

{

	struct write_memory_data *mine;

	mine = (struct write_memory_data *)calloc(1, sizeof(*mine));

	if (mine == NULL) {

		archive_set_error(a, ENOMEM, "No memory");

		return (ARCHIVE_FATAL);

	}

	mine->buff = buff;

	mine->size = buffSize;

	mine->client_size = used;

	return (archive_write_open(a, mine,

		    memory_write_open, memory_write, memory_write_close));

}

static int

memory_write_open(struct archive *a, void *client_data)

{

	struct write_memory_data *mine;

	mine = client_data;

	mine->used = 0;

	if (mine->client_size != NULL)

		*mine->client_size = mine->used;

	/* Disable padding if it hasn't been set explicitly. */

	if (-1 == archive_write_get_bytes_in_last_block(a))

		archive_write_set_bytes_in_last_block(a, 1);

	return (ARCHIVE_OK);

}

/*

 * Copy the data into the client buffer.

 * Note that we update mine->client_size on every write.

 * In particular, this means the client can follow exactly

 * how much has been written into their buffer at any time.

 */

static ssize_t

memory_write(struct archive *a, void *client_data, const void *buff, size_t length)

{

	struct write_memory_data *mine;

	mine = client_data;

	if (mine->used + length > mine->size) {

		archive_set_error(a, ENOMEM, "Buffer exhausted");

		return (ARCHIVE_FATAL);

	}

	memcpy(mine->buff + mine->used, buff, length);

	mine->used += length;

	if (mine->client_size != NULL)

		*mine->client_size = mine->used;

	return (length);

}

static int

memory_write_close(struct archive *a, void *client_data)

{

	struct write_memory_data *mine;

	(void)a; /* UNUSED */

	mine = client_data;

	free(mine);

	return (ARCHIVE_OK);

}