/*

** The Sleuth Kit

**

** Brian Carrier [carrier <at> sleuthkit [dot] org]

** Copyright (c) 2006-2011 Brian Carrier, Basis Technology.  All Rights reserved

** Copyright (c) 2004-2005 Brian Carrier.  All rights reserved

**

**

** This software is distributed under the Common Public License 1.0

**

*/

#include "tsk_fs_i.h"

/**

 *\file rawfs.c

 * Contains internal "raw" specific file system functions.  The raw file system is used to process

 * an arbitrary chunk of data as 512-byte sectors that have no other structure.

 * This means that you can use the data-level tools, but that is it.  Because raw and swapfs

 * are very similar implementations, they share many of the tsk_fs_nofs_XXX functions, such as

 * tsk_fs_nofs_close();

 */

/** \internal

 * Open part of a disk image as a raw file system -- which basically means that it has no file system structure.

 * The data is considered to be in 512-byte sectors.

 *

 * @param img_info Disk image to analyze

 * @param offset Byte offset where "file system" starts

 * @returns NULL on error

 */

TSK_FS_INFO *

rawfs_open(TSK_IMG_INFO * img_info, TSK_OFF_T offset)

{

    TSK_OFF_T len;

    TSK_FS_INFO *fs;

    // clean up any error messages that are lying around

    tsk_error_reset();

    if (img_info->sector_size == 0) {

        tsk_error_reset();

        tsk_error_set_errno(TSK_ERR_FS_ARG);

        tsk_error_set_errstr("rawfs_open: sector size is 0");

        return NULL;

    }

    fs = (TSK_FS_INFO *) tsk_fs_malloc(sizeof(TSK_FS_INFO));

    if (fs == NULL)

        return NULL;

    /* All we need to set are the block sizes and max block size etc. */

    fs->img_info = img_info;

    fs->offset = offset;

    fs->ftype = TSK_FS_TYPE_RAW;

    fs->duname = "Sector";

    fs->flags = 0;

    fs->tag = TSK_FS_INFO_TAG;

    fs->inum_count = 0;

    fs->root_inum = 0;

    fs->first_inum = 0;

    fs->last_inum = 0;

    len = img_info->size;

    fs->block_size = 512;

    fs->block_count = len / fs->block_size;

    if (len % fs->block_size)

        fs->block_count++;

    fs->first_block = 0;

    fs->last_block = fs->last_block_act = fs->block_count - 1;

    fs->dev_bsize = img_info->sector_size;

    /* Pointer to functions */

    fs->close = tsk_fs_nofs_close;

    fs->fsstat = tsk_fs_nofs_fsstat;

    fs->block_walk = tsk_fs_nofs_block_walk;

    fs->block_getflags = tsk_fs_nofs_block_getflags;

    fs->inode_walk = tsk_fs_nofs_inode_walk;

    fs->file_add_meta = tsk_fs_nofs_file_add_meta;

    fs->istat = tsk_fs_nofs_istat;

    fs->get_default_attr_type = tsk_fs_nofs_get_default_attr_type;

    fs->load_attrs = tsk_fs_nofs_make_data_run;

    fs->dir_open_meta = tsk_fs_nofs_dir_open_meta;

    fs->name_cmp = tsk_fs_nofs_name_cmp;

    fs->jblk_walk = tsk_fs_nofs_jblk_walk;

    fs->jentry_walk = tsk_fs_nofs_jentry_walk;

    fs->jopen = tsk_fs_nofs_jopen;

    fs->journ_inum = 0;

    return fs;

}