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4419 trochtova 1
/*
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 * Copyright (c) 2008 Jakub Jermar
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 * Copyright (c) 2008 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup fs
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 * @{
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 */
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/**
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 * @file    tmpfs_dump.c
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 * @brief   Support for loading TMPFS file system dump.
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 */
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#include "tmpfs.h"
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#include "../../vfs/vfs.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <as.h>
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#include <libblock.h>
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#include <byteorder.h>
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#define TMPFS_BLOCK_SIZE    1024
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struct rdentry {
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    uint8_t type;
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    uint32_t len;
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} __attribute__((packed));
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static bool
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tmpfs_restore_recursion(int dev, off_t *bufpos, size_t *buflen, off_t *pos,
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    tmpfs_dentry_t *parent)
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{
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    struct rdentry entry;
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    libfs_ops_t *ops = &tmpfs_libfs_ops;
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    int rc;
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    do {
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        char *fname;
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        tmpfs_dentry_t *node;
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        uint32_t size;
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        if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
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            TMPFS_BLOCK_SIZE) != EOK)
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            return false;
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        entry.len = uint32_t_le2host(entry.len);
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        switch (entry.type) {
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        case TMPFS_NONE:
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            break;
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        case TMPFS_FILE:
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            fname = malloc(entry.len + 1);
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            if (fname == NULL)
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                return false;
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            node = (tmpfs_dentry_t *) ops->create(dev, L_FILE);
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            if (node == NULL) {
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                free(fname);
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                return false;
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            }
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            if (block_read(dev, bufpos, buflen, pos, fname,
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                entry.len, TMPFS_BLOCK_SIZE) != EOK) {
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                ops->destroy((void *) node);
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                free(fname);
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                return false;
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            }
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            fname[entry.len] = 0;
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            rc = ops->link((void *) parent, (void *) node, fname);
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            if (rc != EOK) {
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                ops->destroy((void *) node);
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                free(fname);
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                return false;
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            }
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            free(fname);
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            if (block_read(dev, bufpos, buflen, pos, &size,
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                sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
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                return false;
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            size = uint32_t_le2host(size);
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            node->data = malloc(size);
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            if (node->data == NULL)
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                return false;
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            node->size = size;
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            if (block_read(dev, bufpos, buflen, pos, node->data,
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                size, TMPFS_BLOCK_SIZE) != EOK)
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                return false;
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            break;
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        case TMPFS_DIRECTORY:
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            fname = malloc(entry.len + 1);
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            if (fname == NULL)
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                return false;
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            node = (tmpfs_dentry_t *) ops->create(dev, L_DIRECTORY);
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            if (node == NULL) {
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                free(fname);
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                return false;
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            }
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            if (block_read(dev, bufpos, buflen, pos, fname,
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                entry.len, TMPFS_BLOCK_SIZE) != EOK) {
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                ops->destroy((void *) node);
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                free(fname);
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                return false;
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            }
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            fname[entry.len] = 0;
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            rc = ops->link((void *) parent, (void *) node, fname);
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            if (rc != EOK) {
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                ops->destroy((void *) node);
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                free(fname);
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                return false;
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            }
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            free(fname);
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            if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
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                node))
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                return false;
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            break;
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        default:
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            return false;
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        }
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    } while (entry.type != TMPFS_NONE);
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    return true;
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}
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bool tmpfs_restore(dev_handle_t dev)
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{
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    libfs_ops_t *ops = &tmpfs_libfs_ops;
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    int rc;
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    rc = block_init(dev, TMPFS_BLOCK_SIZE);
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    if (rc != EOK)
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        return false;
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    off_t bufpos = 0;
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    size_t buflen = 0;
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    off_t pos = 0;
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    char tag[6];
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    if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
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        TMPFS_BLOCK_SIZE) != EOK)
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        goto error;
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    tag[5] = 0;
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    if (str_cmp(tag, "TMPFS") != 0)
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        goto error;
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    if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
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        ops->root_get(dev)))
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        goto error;
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    block_fini(dev);
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    return true;
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error:
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    block_fini(dev);
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    return false;
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}
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/**
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 * @}
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 */