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/*

 * Copyright (c) 2008 Jakub Jermar 

 * Copyright (c) 2008 Martin Decky 

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.

 */

/** @addtogroup fs

 * @{

 */ 

/**

 * @file	tmpfs_dump.c

 * @brief	Support for loading TMPFS file system dump.

 */

#include "tmpfs.h"

#include "../../vfs/vfs.h"

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <as.h>

#include <libblock.h>

#include <byteorder.h>

#define TMPFS_BLOCK_SIZE	1024

struct rdentry {

	uint8_t type;

	uint32_t len;

} __attribute__((packed));

static bool

tmpfs_restore_recursion(int dev, off_t *bufpos, size_t *buflen, off_t *pos,

    tmpfs_dentry_t *parent)

{

	struct rdentry entry;

	libfs_ops_t *ops = &tmpfs_libfs_ops;

	int rc;

	do {

		char *fname;

		tmpfs_dentry_t *node;

		uint32_t size;

		if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),

		    TMPFS_BLOCK_SIZE) != EOK)

			return false;

		entry.len = uint32_t_le2host(entry.len);

		switch (entry.type) {

		case TMPFS_NONE:

			break;

		case TMPFS_FILE:

			fname = malloc(entry.len + 1);

			if (fname == NULL)

				return false;

			node = (tmpfs_dentry_t *) ops->create(dev, L_FILE);

			if (node == NULL) {

				free(fname);

				return false;

			}

			if (block_read(dev, bufpos, buflen, pos, fname,

			    entry.len, TMPFS_BLOCK_SIZE) != EOK) {

				ops->destroy((void *) node);

				free(fname);

				return false;

			}

			fname[entry.len] = 0;

			rc = ops->link((void *) parent, (void *) node, fname);

			if (rc != EOK) {

				ops->destroy((void *) node);

				free(fname);

				return false;

			}

			free(fname);

			if (block_read(dev, bufpos, buflen, pos, &size,

			    sizeof(size), TMPFS_BLOCK_SIZE) != EOK)

				return false;

			size = uint32_t_le2host(size);

			node->data = malloc(size);

			if (node->data == NULL)

				return false;

			node->size = size;

			if (block_read(dev, bufpos, buflen, pos, node->data,

			    size, TMPFS_BLOCK_SIZE) != EOK)

				return false;

			break;

		case TMPFS_DIRECTORY:

			fname = malloc(entry.len + 1);

			if (fname == NULL)

				return false;

			node = (tmpfs_dentry_t *) ops->create(dev, L_DIRECTORY);

			if (node == NULL) {

				free(fname);

				return false;

			}

			if (block_read(dev, bufpos, buflen, pos, fname,

			    entry.len, TMPFS_BLOCK_SIZE) != EOK) {

				ops->destroy((void *) node);

				free(fname);

				return false;

			}

			fname[entry.len] = 0;

			rc = ops->link((void *) parent, (void *) node, fname);

			if (rc != EOK) {

				ops->destroy((void *) node);

				free(fname);

				return false;

			}

			free(fname);

			if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,

			    node))

				return false;

			break;

		default:

			return false;

		}

	} while (entry.type != TMPFS_NONE);

	return true;

}

bool tmpfs_restore(dev_handle_t dev)

{

	libfs_ops_t *ops = &tmpfs_libfs_ops;

	int rc;

	rc = block_init(dev, TMPFS_BLOCK_SIZE);

	if (rc != EOK)

		return false; 

	off_t bufpos = 0;

	size_t buflen = 0;

	off_t pos = 0;

	char tag[6];

	if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,

	    TMPFS_BLOCK_SIZE) != EOK)

		goto error;

	tag[5] = 0;

	if (str_cmp(tag, "TMPFS") != 0)

		goto error;

	if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,

	    ops->root_get(dev)))

		goto error;

	block_fini(dev);

	return true;

error:

	block_fini(dev);

	return false;

}

/**

 * @}

 */