/*
** The Sleuth Kit
**
** Brian Carrier [carrier <at> sleuthkit [dot] org]
** Copyright (c) 2006-2011 Brian Carrier, Basis Technology.  All Rights reserved
** Copyright (c) 2003-2005 Brian Carrier.  All rights reserved
**
** TASK
** Copyright (c) 2002-2003 Brian Carrier, @stake Inc.  All rights reserved
**
** Copyright (c) 1997,1998,1999, International Business Machines
** Corporation and others. All Rights Reserved.
*/

/**
 *\file ext2fs.c
 * Contains the internal TSK ext2/ext3/ext4 file system functions.
 */

/* TCT
 * LICENSE
 *	This software is distributed under the IBM Public License.
 * AUTHOR(S)
 *	Wietse Venema
 *	IBM T.J. Watson Research
 *	P.O. Box 704
 *	Yorktown Heights, NY 10598, USA
 --*/

#include "tsk_fs_i.h"
#include "tsk_ext2fs.h"
#include "tsk/base/crc.h"
#include <stddef.h>
//#define Ext4_DBG 1
//#define EXT4_CHECKSUMS 1


#ifdef Ext4_DBG
static uint8_t
debug_print_buf(unsigned char *buf, int len)
{
    int i = 0;
    for (i = 0; i < len; i++) {
        if (i % 8 == 0)
            printf("%08X:\t", i);
        printf("0x%02X ", buf[i]);
        if ((i + 1) % 8 == 0)
            printf("\n");
    }
    printf("\n");
    return 0;
}
#endif


/** \internal
    test_root - tests to see if a is power of b
    @param a the number being investigated
    @param b the root
    @return 1 if a is a power of b, otherwise 0
*/
static uint8_t
test_root(uint32_t a, uint32_t b)
{
    if (a == 0) {
        return b == 0;
    }
    else if (b == 0) {
        return 0;
    }
    else if (a == 1) {
        // anything to power of 0 is 1
        return 1;
    }
    else if (b == 1) {
        return 0;
    }
 
    // keep on multiplying b by itself 
    uint32_t b2;
    for (b2 = b; b2 < a; b2 *= b) {}
 
    // was it an exact match?
    return b2 == a;
}

/** \internal
 * Test if block group has a super block in it.
 *
 * @return 1 if block group has superblock, otherwise 0
*/
static uint32_t
ext2fs_is_super_bg(uint32_t feature_ro_compat, uint32_t group_block)
{
    // if no sparse feature, then it has super block
    if (!(feature_ro_compat & EXT2FS_FEATURE_RO_COMPAT_SPARSE_SUPER))
        return 1;

    // group 0 always has super block
    if (group_block == 0) 
        return 1;

    // Sparse FS put super blocks in groups that are powers of 3, 5, 7
    if (test_root(group_block, 3) || 
            (test_root(group_block, 5)) ||
            (test_root(group_block, 7))) {
        return 1;
    }

    return 0;
}





/* ext2fs_group_load - load 32-bit or 64-bit block group descriptor into cache
 *
 * Note: This routine assumes &ext2fs->lock is locked by the caller.
 *
 * return 1 on error and 0 on success.  On success one of either ext2fs->grp_buf or ext2fs->ext4_grp_buf will
 * be non-null and contain the valid data. Because Ext4 can have 32-bit group descriptors, check which buffer is 
 * non-null to determine what to read instead of duplicating the logic everywhere.
 *
 * */
static uint8_t
    ext2fs_group_load(EXT2FS_INFO * ext2fs, EXT2_GRPNUM_T grp_num)
{
    TSK_FS_INFO *fs = (TSK_FS_INFO *) ext2fs;
    size_t gd_size = tsk_getu16(fs->endian, ext2fs->fs->s_desc_size);

    /*
    * Sanity check
    */
    if (grp_num >= ext2fs->groups_count) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_ARG);
        tsk_error_set_errstr
            ("ext2fs_group_load: invalid cylinder group number: %"
            PRI_EXT2GRP "", grp_num);
        return 1;
    }
    // already loaded
    else if (ext2fs->grp_num == grp_num) {
        return 0;
    }

    // 64-bit version.  
    if (((fs->ftype == TSK_FS_TYPE_EXT4)) && (EXT2FS_HAS_INCOMPAT_FEATURE(fs, ext2fs->fs,
        EXT2FS_FEATURE_INCOMPAT_64BIT)
        && (tsk_getu16(fs->endian, ext2fs->fs->s_desc_size) >= 64))) {
            TSK_OFF_T offs;
            ssize_t cnt;

            if (gd_size < (int)sizeof(ext4fs_gd))
                gd_size = sizeof(ext4fs_gd);

            if (ext2fs->ext4_grp_buf == NULL) {
                if ((ext2fs->ext4_grp_buf = (ext4fs_gd *) tsk_malloc(gd_size)) == NULL) 
                    return 1;
            }
            offs = ext2fs->groups_offset + grp_num * gd_size;

            cnt = tsk_fs_read(&ext2fs->fs_info, offs, (char *) ext2fs->ext4_grp_buf, gd_size);

#ifdef Ext4_DBG
            debug_print_buf((char *) ext2fs->ext4_grp_buf, gd_size);
#endif
            if (cnt != (ssize_t) gd_size) {
                if (cnt >= 0) {
                    tsk_error_reset();
                    tsk_error_set_errno(TSK_ERR_FS_READ);
                }
                tsk_error_set_errstr2("ext2fs_group_load: Group descriptor %"
                    PRI_EXT2GRP " at %" PRIdOFF, grp_num, offs);
                return 1;
            }

            // sanity checks
            if ((ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_block_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_block_bitmap_lo) > fs->last_block) ||
                (ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_lo) > fs->last_block) ||
                (ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_inode_table_hi,
                ext2fs->ext4_grp_buf->bg_inode_table_lo) > fs->last_block)) {
                    tsk_error_reset();
                    tsk_error_set_errno(TSK_ERR_FS_CORRUPT);
                    tsk_error_set_errstr("extXfs_group_load: Ext4 Group %" PRI_EXT2GRP
                        " descriptor block locations too large at byte offset %"
                        PRIuDADDR, grp_num, offs);
                    return 1;
            }
    }
    else {
        TSK_OFF_T offs;
        ssize_t cnt;
        if (gd_size < (int)sizeof(ext2fs_gd))
            gd_size = sizeof(ext2fs_gd);

        if (ext2fs->grp_buf == NULL) {
            if ((ext2fs->grp_buf = (ext2fs_gd *) tsk_malloc(gd_size)) == NULL) 
                return 1;
        }
        offs = ext2fs->groups_offset + grp_num * gd_size;

        cnt = tsk_fs_read(&ext2fs->fs_info, offs, (char *) ext2fs->grp_buf, gd_size);

        if (cnt != (ssize_t) gd_size) {
            if (cnt >= 0) {
                tsk_error_reset();
                tsk_error_set_errno(TSK_ERR_FS_READ);
            }
            tsk_error_set_errstr2("ext2fs_group_load: Group descriptor %"
                PRI_EXT2GRP " at %" PRIdOFF, grp_num, offs);
            return 1;
        }

        // sanity checks
        if ((tsk_getu32(fs->endian,
            ext2fs->grp_buf->bg_block_bitmap) > fs->last_block) ||
            (tsk_getu32(fs->endian,
            ext2fs->grp_buf->bg_inode_bitmap) > fs->last_block) ||
            (tsk_getu32(fs->endian,
            ext2fs->grp_buf->bg_inode_table) > fs->last_block)) {
                tsk_error_reset();
                tsk_error_set_errno(TSK_ERR_FS_CORRUPT);
                tsk_error_set_errstr("extXfs_group_load: Group %" PRI_EXT2GRP
                    " descriptor block locations too large at byte offset %"
                    PRIuDADDR, grp_num, offs);
                return 1;
        }

        if (tsk_verbose) {
            TSK_FS_INFO *fs = (TSK_FS_INFO *) & ext2fs->fs_info;
            tsk_fprintf(stderr,
                "\tgroup %" PRI_EXT2GRP ": %" PRIu16 "/%" PRIu16
                " free blocks/inodes\n", grp_num, tsk_getu16(fs->endian,
                ext2fs->grp_buf->bg_free_blocks_count),
                tsk_getu16(fs->endian, ext2fs->grp_buf->bg_free_inodes_count));
        }
    }
    ext2fs->grp_num = grp_num;

    return 0;
}

#ifdef EXT4_CHECKSUMS
/**
 * ext4_group_desc_csum - Calculates the checksum of a group descriptor
 * Ported from linux/fs/ext4/super.c
 * @ext4_sb:       pointer to ext2 super block structure
 * @block_group:   group descriptor number
 * @gdp:           pointer to group descriptor to calculate checksum for
 * returns the checksum value
 */
static uint16_t
ext4_group_desc_csum(ext2fs_sb * ext4_sb, uint32_t block_group,
    struct ext4fs_gd *gdp)
{
    cm_t CRC16_CTX;
    CRC16_CTX.cm_width = 16;
    CRC16_CTX.cm_poly = 0x8005L;
    CRC16_CTX.cm_init = 0xFFFFL;
    CRC16_CTX.cm_refin = TRUE;
    CRC16_CTX.cm_refot = TRUE;
    CRC16_CTX.cm_xorot = 0x0000L;
    cm_ini(&CRC16_CTX);
    if (*ext4_sb->s_feature_ro_compat & EXT2FS_FEATURE_RO_COMPAT_GDT_CSUM) {
        int offset = offsetof(struct ext4fs_gd, bg_checksum);
        uint32_t le_group = tsk_getu32(TSK_LIT_ENDIAN, &block_group);
        crc16(&CRC16_CTX, ext4_sb->s_uuid, sizeof(ext4_sb->s_uuid));
        crc16(&CRC16_CTX, (uint8_t *) & le_group, sizeof(le_group));
        crc16(&CRC16_CTX, (uint8_t *) gdp, offset);
        offset += sizeof(gdp->bg_checksum);     /* skip checksum */
        /* for checksum of struct ext4_group_desc do the rest... */
        if ((*ext4_sb->s_feature_incompat &
                EXT2FS_FEATURE_INCOMPAT_64BIT) &&
            offset < *ext4_sb->s_desc_size) {
            crc16(&CRC16_CTX, (uint8_t *) gdp + offset,
                *ext4_sb->s_desc_size - offset);
        }
    }

    return cm_crc(&CRC16_CTX);
}
#endif


/* ext2fs_print_map - print a bitmap */

static void
ext2fs_print_map(uint8_t * map, int len)
{
    int i;

    for (i = 0; i < len; i++) {
        if (i > 0 && i % 10 == 0)
            putc('|', stderr);
        putc(isset(map, i) ? '1' : '.', stderr);
    }
    putc('\n', stderr);
}

#define INODE_TABLE_SIZE(ext2fs) \
    ((tsk_getu32(ext2fs->fs_info.endian, ext2fs->fs->s_inodes_per_group) * ext2fs->inode_size - 1) \
           / ext2fs->fs_info.block_size + 1)

/* ext2fs_bmap_load - look up block bitmap & load into cache
 *
 * Note: This routine assumes &ext2fs->lock is locked by the caller.
 *
 * return 1 on error and 0 on success
 * */
static uint8_t
ext2fs_bmap_load(EXT2FS_INFO * ext2fs, EXT2_GRPNUM_T grp_num)
{
    TSK_FS_INFO *fs = (TSK_FS_INFO *) & ext2fs->fs_info;
    ssize_t cnt;
    TSK_DADDR_T addr;

    /*
     * Look up the group descriptor info.  The load will do the sanity check.
     */
    if (ext2fs_group_load(ext2fs, grp_num)) {
        return 1;
    }

    if (ext2fs->bmap_buf == NULL) {
        if ((ext2fs->bmap_buf =
                (uint8_t *) tsk_malloc(fs->block_size)) == NULL) {
            return 1;
        }
    }
    else if (ext2fs->bmap_grp_num == grp_num) {
        return 0;
    }
    
    if (ext2fs->ext4_grp_buf != NULL) { 
        addr = ext4_getu64(fs->endian,
            ext2fs->ext4_grp_buf->bg_block_bitmap_hi,
            ext2fs->ext4_grp_buf->bg_block_bitmap_lo);
    }
    else {
        addr = (TSK_DADDR_T) tsk_getu32(fs->endian, ext2fs->grp_buf->bg_block_bitmap);
    }

    if (addr > fs->last_block) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_BLK_NUM);
        tsk_error_set_errstr
            ("ext2fs_bmap_load: Block too large for image: %" PRIu64, addr);
        return 1;
    }

    cnt = tsk_fs_read(fs, addr * fs->block_size, 
        (char *) ext2fs->bmap_buf, ext2fs->fs_info.block_size);

    if (cnt != ext2fs->fs_info.block_size) {
        if (cnt >= 0) {
            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_READ);
        }
        tsk_error_set_errstr2("ext2fs_bmap_load: block bitmap %"
            PRI_EXT2GRP " at %" PRIu64, grp_num, addr);
        return 1;
    }

    ext2fs->bmap_grp_num = grp_num;
    if (tsk_verbose > 1)
        ext2fs_print_map(ext2fs->bmap_buf,
            tsk_getu32(fs->endian, ext2fs->fs->s_blocks_per_group));    
    return 0;
}


/* ext2fs_imap_load - look up inode bitmap & load into cache
 *
 * Note: This routine assumes &ext2fs->lock is locked by the caller.
 *
 * return 0 on success and 1 on error
 * */
static uint8_t
    ext2fs_imap_load(EXT2FS_INFO * ext2fs, EXT2_GRPNUM_T grp_num)
{
    TSK_FS_INFO *fs = (TSK_FS_INFO *) & ext2fs->fs_info;
    ssize_t cnt;
    TSK_DADDR_T addr;

    /*
    * Look up the group descriptor info.
    */
    if (ext2fs_group_load(ext2fs, grp_num)) {
        return 1;
    }

    /* Allocate the cache buffer and exit if map is already loaded */
    if (ext2fs->imap_buf == NULL) {
        if ((ext2fs->imap_buf =
            (uint8_t *) tsk_malloc(fs->block_size)) == NULL) {
                return 1;
        }
    }
    else if (ext2fs->imap_grp_num == grp_num) {
        return 0;
    }

    /*
    * Look up the inode allocation bitmap.
    */
    if (ext2fs->ext4_grp_buf != NULL) { 
        addr = ext4_getu64(fs->endian,
            ext2fs->ext4_grp_buf->bg_inode_bitmap_hi,
            ext2fs->ext4_grp_buf->bg_inode_bitmap_lo);
    }
    else {
        addr = (TSK_DADDR_T) tsk_getu32(fs->endian, ext2fs->grp_buf->bg_inode_bitmap);
    }

    if (addr > fs->last_block) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_BLK_NUM);
        tsk_error_set_errstr
            ("ext2fs_imap_load: Block too large for image: %" PRIu64, addr);
        return 1;
    }

    // Ensure the bitmap buffer is initialized.
    memset(ext2fs->imap_buf, 0, fs->block_size);

    cnt = tsk_fs_read(fs, addr * fs->block_size, 
        (char *) ext2fs->imap_buf, ext2fs->fs_info.block_size);

    if (cnt != ext2fs->fs_info.block_size) {
        if (cnt >= 0) {
            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_READ);
        }
        tsk_error_set_errstr2("ext2fs_imap_load: Inode bitmap %"
            PRI_EXT2GRP " at %" PRIu64, grp_num, addr);
        return 1;
    }

    ext2fs->imap_grp_num = grp_num;
    if (tsk_verbose > 1)
        ext2fs_print_map(ext2fs->imap_buf,
        tsk_getu32(fs->endian, ext2fs->fs->s_inodes_per_group));

    return 0;
}

/* ext2fs_dinode_load - look up disk inode & load into ext2fs_inode structure
 * @param ext2fs A ext2fs file system information structure
 * @param dino_inum Metadata address
 * @param dino_buf The buffer to store the block in (must be size of ext2fs->inode_size or larger)
 * @param ea_buf The buffer to hold the extended attribute data
 *
 * return 1 on error and 0 on success
 * */

static uint8_t
ext2fs_dinode_load(EXT2FS_INFO * ext2fs, TSK_INUM_T dino_inum,
    ext2fs_inode * dino_buf, uint8_t ** ea_buf, size_t * ea_buf_len)
{
    EXT2_GRPNUM_T grp_num;
    TSK_OFF_T addr;
    ssize_t cnt;
    TSK_INUM_T rel_inum;
    TSK_FS_INFO *fs = (TSK_FS_INFO *) & ext2fs->fs_info;

    /*
     * Sanity check.
     * Use last_num-1 to account for virtual Orphan directory in last_inum.
     */
    if ((dino_inum < fs->first_inum) || (dino_inum > fs->last_inum - 1)) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_INODE_NUM);
        tsk_error_set_errstr("ext2fs_dinode_load: address: %" PRIuINUM,
            dino_inum);
        return 1;
    }

    if (dino_buf == NULL) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_ARG);
        tsk_error_set_errstr("ext2fs_dinode_load: dino_buf is NULL");
        return 1;
    }

    /*
     * Look up the group descriptor for this inode.
     */
    grp_num = (EXT2_GRPNUM_T) ((dino_inum - fs->first_inum) /
        tsk_getu32(fs->endian, ext2fs->fs->s_inodes_per_group));

    /* lock access to grp_buf */
    tsk_take_lock(&ext2fs->lock);

    if (ext2fs_group_load(ext2fs, grp_num)) {
        tsk_release_lock(&ext2fs->lock);
        return 1;
    }

    /*
     * Look up the inode table block for this inode.
     */
    rel_inum =
        (dino_inum - 1) - tsk_getu32(fs->endian,
        ext2fs->fs->s_inodes_per_group) * grp_num;
    if (ext2fs->ext4_grp_buf != NULL) {
#ifdef Ext4_DBG
        printf("DEBUG: d_inode_load 64bit gd_size=%d\n",
            tsk_getu16(fs->endian, ext2fs->fs->s_desc_size));
#endif
        /* Test for possible overflow */
        if (ext4_getu64(fs->endian, ext2fs->ext4_grp_buf->bg_inode_table_hi, ext2fs->ext4_grp_buf->bg_inode_table_lo) 
                >= LLONG_MAX / fs->block_size) {
            tsk_release_lock(&ext2fs->lock);

            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_READ);
            tsk_error_set_errstr
            ("ext2fs_dinode_load: Overflow when calculating address");
            return 1;
        }

        addr =
            (TSK_OFF_T) ext4_getu64(fs->endian,
            ext2fs->ext4_grp_buf->bg_inode_table_hi,
            ext2fs->ext4_grp_buf->bg_inode_table_lo)
            * (TSK_OFF_T) fs->block_size +
            rel_inum * (TSK_OFF_T) ext2fs->inode_size;
    }
    else {
        addr =
            (TSK_OFF_T) tsk_getu32(fs->endian,
            ext2fs->grp_buf->bg_inode_table) * (TSK_OFF_T) fs->block_size +
            rel_inum * (TSK_OFF_T) ext2fs->inode_size;
    }
    tsk_release_lock(&ext2fs->lock);

    cnt = tsk_fs_read(fs, addr, (char *) dino_buf, ext2fs->inode_size);

    if (cnt != ext2fs->inode_size) {
        if (cnt >= 0) {
            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_READ);
        }
        tsk_error_set_errstr2("ext2fs_dinode_load: Inode %" PRIuINUM
            " from %" PRIdOFF, dino_inum, addr);
        return 1;
    }
//DEBUG    printf("Inode Size: %d, %d, %d, %d\n", sizeof(ext2fs_inode), *ext2fs->fs->s_inode_size, ext2fs->inode_size, *ext2fs->fs->s_want_extra_isize);
//DEBUG    debug_print_buf((char *)dino_buf, ext2fs->inode_size);

    // Check if we have an extended attribute in the inode
    if (ext2fs->inode_size > EXT2_EA_INODE_OFFSET) {
        // The extended attribute data immediatly follows the standard inode data
        *ea_buf = (char*)dino_buf + EXT2_EA_INODE_OFFSET;
        *ea_buf_len = ext2fs->inode_size - EXT2_EA_INODE_OFFSET;
    }
    else {
        *ea_buf = NULL;
    }

    if (tsk_verbose) {
        tsk_fprintf(stderr,
            "%" PRIuINUM " m/l/s=%o/%d/%" PRIu32
            " u/g=%d/%d macd=%" PRIu32 "/%" PRIu32 "/%" PRIu32 "/%" PRIu32
            "\n", dino_inum, tsk_getu16(fs->endian, dino_buf->i_mode),
            tsk_getu16(fs->endian, dino_buf->i_nlink),
            (tsk_getu32(fs->endian,
                    dino_buf->i_size) + (tsk_getu16(fs->endian,
                        dino_buf->i_mode) & EXT2_IN_REG) ? (uint64_t)
                tsk_getu32(fs->endian, dino_buf->i_size_high) << 32 : 0),
            tsk_getu16(fs->endian,
                dino_buf->i_uid) + (tsk_getu16(fs->endian,
                    dino_buf->i_uid_high) << 16), tsk_getu16(fs->endian,
                dino_buf->i_gid) + (tsk_getu16(fs->endian,
                    dino_buf->i_gid_high) << 16), tsk_getu32(fs->endian,
                dino_buf->i_mtime), tsk_getu32(fs->endian,
                dino_buf->i_atime), tsk_getu32(fs->endian,
                dino_buf->i_ctime), tsk_getu32(fs->endian,
                dino_buf->i_dtime));
    }

    return 0;
}

/**
* \internal
* Loads attribute for Ext4 inline storage method.
* @param fs_file File to load attrs
* @param ea_buf  Extended attribute buffer
* @param ea_buf_len Extended attribute buffer length
* @returns 0 on success, 1 otherwise
*/
static uint8_t
ext4_load_attrs_inline(TSK_FS_FILE *fs_file, const uint8_t * ea_buf, size_t ea_buf_len)
{
    TSK_FS_META *fs_meta = fs_file->meta;
    TSK_FS_ATTR *fs_attr;

    // see if we have already loaded the attr
    if ((fs_meta->attr != NULL)
        && (fs_meta->attr_state == TSK_FS_META_ATTR_STUDIED)) {
        return 0;
    }

    if (fs_meta->attr_state == TSK_FS_META_ATTR_ERROR) {
        return 1;
    }

    // First load the data from the extended attr (if present)
    const char *ea_inline_data = NULL;
    uint32_t ea_inline_data_len = 0;
    if ((ea_buf != NULL) && (ea_buf_len > 4 + sizeof(ext2fs_ea_entry))
        && (tsk_getu32(fs_file->fs_info->endian, ea_buf) == EXT2_EA_MAGIC)) {

        // First entry starts after the four byte header
        size_t index = 4;
        ext2fs_ea_entry *ea_entry = (ext2fs_ea_entry*) &(ea_buf[index]);

        // The end of the list of entries is marked by two null bytes
        while ((ea_entry->nlen != 0) || (ea_entry->nidx != 0)) {

            // It looks like the continuation of inline data is stored in system.data.
            // Make sure we have room to read the attr name 'data'.
            if ((ea_entry->nidx == EXT2_EA_IDX_SYSTEM)
                && (ea_entry->nlen == 4)
                && (index + sizeof(ext2fs_ea_entry) + strlen("data") < ea_buf_len)
                && (strncmp(&(ea_entry->name), "data", 4)) == 0) {

                // This is the right attribute. Check that the length and offset are valid.
                // The offset is from the beginning of the entries, i.e., four bytes into the buffer.
                uint16_t offset = tsk_getu16(fs_file->fs_info->endian, ea_entry->val_off);
                uint32_t size = tsk_getu32(fs_file->fs_info->endian, ea_entry->val_size);
                if ((ea_buf_len >= 4) && (offset < ea_buf_len - 4) && (size <= ea_buf_len - 4 - offset)) {
                    ea_inline_data = &(ea_buf[4 + offset]);
                    ea_inline_data_len = size;
                    break;
                }
            }

            // Prepare to load the next entry.
            // The entry size is the size of the struct plus the length of the name, minus one
            // because the struct contains the first character of the name.
            index += sizeof(ext2fs_ea_entry) + ea_entry->nlen - 1;

            // Make sure there's room for the next entry plus the 'data' name we're looking for.
            if (index + sizeof(ext2fs_ea_entry) + strlen("data") > ea_buf_len) {
                break;
            }
            ea_entry = (ext2fs_ea_entry*) &(ea_buf[index]);
        }
    }

    // Check if resident data size exceeds maximum inode size (1024) - ext4 inode resident data offset (156)
    if ((fs_meta->size == 0) || (fs_meta->size > (1024 - 156))) {
        return 1;
    }

    // Combine the two parts of the inline data for the resident attribute. For now, make a
    // buffer for the full file size - this may be different than the length of the data 
    // from the inode if we have sparse data.
    uint8_t *resident_data = (uint8_t*)tsk_malloc(fs_meta->size);
    if (resident_data == NULL) {
        return 1;
    }
    memset(resident_data, 0, fs_meta->size);

    // Copy the data from the inode.
    size_t inode_data_len = (fs_meta->size < EXT2_INLINE_MAX_DATA_LEN) ? fs_meta->size : EXT2_INLINE_MAX_DATA_LEN;
    memcpy(resident_data, fs_meta->content_ptr, inode_data_len);

    // If we need more data and found an extended attribute, append that data
    if ((fs_meta->size > EXT2_INLINE_MAX_DATA_LEN) && (ea_inline_data_len > 0)) {
        // Don't go beyond the size of the file
        size_t ea_data_len = (ea_inline_data_len < (uint64_t)fs_meta->size - inode_data_len) ? ea_inline_data_len : fs_meta->size - inode_data_len;
        memcpy(resident_data + inode_data_len, ea_inline_data, ea_data_len);
    }

    if (fs_meta->attr == NULL) {
        fs_meta->attr = tsk_fs_attrlist_alloc();
    }
    if ((fs_attr =
        tsk_fs_attrlist_getnew(fs_meta->attr,
            TSK_FS_ATTR_RES)) == NULL) {
        free(resident_data);
        return 1;
    }

    // Set the details in the fs_attr structure
    if (tsk_fs_attr_set_str(fs_file, fs_attr, "DATA",
        TSK_FS_ATTR_TYPE_DEFAULT, TSK_FS_ATTR_ID_DEFAULT,
        (void*)resident_data,
        fs_meta->size)) {
        free(resident_data);
        fs_meta->attr_state = TSK_FS_META_ATTR_ERROR;
        return 1;
    }

    free(resident_data);
    fs_meta->attr_state = TSK_FS_META_ATTR_STUDIED;
    return 0;
}

/* ext2fs_dinode_copy - copy cached disk inode into generic inode
 *
 * returns 1 on error and 0 on success
 * */
static uint8_t
ext2fs_dinode_copy(EXT2FS_INFO * ext2fs, TSK_FS_FILE * fs_file,
    TSK_INUM_T inum, const ext2fs_inode * dino_buf, const uint8_t * ea_buf, size_t ea_buf_len)
{
    int i;
    TSK_FS_INFO *fs = (TSK_FS_INFO *) & ext2fs->fs_info;
    TSK_FS_META * fs_meta = fs_file->meta;
    ext2fs_sb *sb = ext2fs->fs;
    EXT2_GRPNUM_T grp_num;
    TSK_INUM_T ibase = 0;

    if (dino_buf == NULL) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_ARG);
        tsk_error_set_errstr("ext2fs_dinode_copy: dino_buf is NULL");
        return 1;
    }

    fs_meta->attr_state = TSK_FS_META_ATTR_EMPTY;
    if (fs_meta->attr) {
        tsk_fs_attrlist_markunused(fs_meta->attr);
    }

    // set the type
    switch (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_FMT) {
    case EXT2_IN_REG:
        fs_meta->type = TSK_FS_META_TYPE_REG;
        break;
    case EXT2_IN_DIR:
        fs_meta->type = TSK_FS_META_TYPE_DIR;
        break;
    case EXT2_IN_SOCK:
        fs_meta->type = TSK_FS_META_TYPE_SOCK;
        break;
    case EXT2_IN_LNK:
        fs_meta->type = TSK_FS_META_TYPE_LNK;
        break;
    case EXT2_IN_BLK:
        fs_meta->type = TSK_FS_META_TYPE_BLK;
        break;
    case EXT2_IN_CHR:
        fs_meta->type = TSK_FS_META_TYPE_CHR;
        break;
    case EXT2_IN_FIFO:
        fs_meta->type = TSK_FS_META_TYPE_FIFO;
        break;
    default:
        fs_meta->type = TSK_FS_META_TYPE_UNDEF;
        break;
    }

    // set the mode
    fs_meta->mode = 0;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_ISUID)
        fs_meta->mode |= TSK_FS_META_MODE_ISUID;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_ISGID)
        fs_meta->mode |= TSK_FS_META_MODE_ISGID;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_ISVTX)
        fs_meta->mode |= TSK_FS_META_MODE_ISVTX;

    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IRUSR)
        fs_meta->mode |= TSK_FS_META_MODE_IRUSR;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IWUSR)
        fs_meta->mode |= TSK_FS_META_MODE_IWUSR;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IXUSR)
        fs_meta->mode |= TSK_FS_META_MODE_IXUSR;

    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IRGRP)
        fs_meta->mode |= TSK_FS_META_MODE_IRGRP;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IWGRP)
        fs_meta->mode |= TSK_FS_META_MODE_IWGRP;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IXGRP)
        fs_meta->mode |= TSK_FS_META_MODE_IXGRP;

    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IROTH)
        fs_meta->mode |= TSK_FS_META_MODE_IROTH;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IWOTH)
        fs_meta->mode |= TSK_FS_META_MODE_IWOTH;
    if (tsk_getu16(fs->endian, dino_buf->i_mode) & EXT2_IN_IXOTH)
        fs_meta->mode |= TSK_FS_META_MODE_IXOTH;

    fs_meta->nlink = tsk_getu16(fs->endian, dino_buf->i_nlink);

    fs_meta->size = tsk_getu32(fs->endian, dino_buf->i_size);

    fs_meta->addr = inum;

    /* the general size value in the inode is only 32-bits,
     * but the i_dir_acl value is used for regular files to
     * hold the upper 32-bits
     *
     * The RO_COMPAT_LARGE_FILE flag in the super block will identify
     * if there are any large files in the file system
     */
    if ((fs_meta->type == TSK_FS_META_TYPE_REG) &&
        (tsk_getu32(fs->endian, sb->s_feature_ro_compat) &
            EXT2FS_FEATURE_RO_COMPAT_LARGE_FILE)) {
        fs_meta->size +=
            ((uint64_t) tsk_getu32(fs->endian,
                dino_buf->i_size_high) << 32);
    }

    fs_meta->uid =
        tsk_getu16(fs->endian, dino_buf->i_uid) + ((TSK_UID_T)tsk_getu16(fs->endian,
            dino_buf->i_uid_high) << 16);
    fs_meta->gid =
        tsk_getu16(fs->endian, dino_buf->i_gid) + ((TSK_GID_T)tsk_getu16(fs->endian,
            dino_buf->i_gid_high) << 16);
    fs_meta->mtime = tsk_getu32(fs->endian, dino_buf->i_mtime);
    fs_meta->atime = tsk_getu32(fs->endian, dino_buf->i_atime);
    fs_meta->ctime = tsk_getu32(fs->endian, dino_buf->i_ctime);
    fs_meta->time2.ext2.dtime = tsk_getu32(fs->endian, dino_buf->i_dtime);
    if (fs->ftype == TSK_FS_TYPE_EXT4) {
        fs_meta->mtime_nano =
            tsk_getu32(fs->endian, dino_buf->i_mtime_extra) >> 2;
        fs_meta->atime_nano =
            tsk_getu32(fs->endian, dino_buf->i_atime_extra) >> 2;
        fs_meta->ctime_nano =
            tsk_getu32(fs->endian, dino_buf->i_ctime_extra) >> 2;
        fs_meta->crtime = tsk_getu32(fs->endian, dino_buf->i_crtime);
        fs_meta->crtime_nano =
            tsk_getu32(fs->endian, dino_buf->i_crtime_extra) >> 2;
    }
    else {
        fs_meta->mtime_nano = fs_meta->atime_nano = fs_meta->ctime_nano = 0;
        fs_meta->crtime = 0;
    }
    fs_meta->time2.ext2.dtime_nano = 0;
    fs_meta->seq = 0;

    if (fs_meta->link) {
        free(fs_meta->link);
        fs_meta->link = NULL;
    }

    if (fs_meta->content_len != EXT2FS_FILE_CONTENT_LEN) {
        if ((fs_meta =
                tsk_fs_meta_realloc(fs_meta,
                    EXT2FS_FILE_CONTENT_LEN)) == NULL) {
            return 1;
        }
    }

    if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_EXTENTS) {
        uint32_t *addr_ptr;
        fs_meta->content_type = TSK_FS_META_CONTENT_TYPE_EXT4_EXTENTS;
        /* NOTE TSK_DADDR_T != uint32_t, so lets make sure we use uint32_t */
        addr_ptr = (uint32_t *) fs_meta->content_ptr;
        for (i = 0; i < EXT2FS_NDADDR + EXT2FS_NIADDR; i++) {
            addr_ptr[i] = tsk_gets32(fs->endian, dino_buf->i_block[i]);
        }
    }
    else if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_INLINE_DATA) {
        uint32_t *addr_ptr;
        fs_meta->content_type = TSK_FS_META_CONTENT_TYPE_EXT4_INLINE;
        addr_ptr = (uint32_t *)fs_meta->content_ptr;
        for (i = 0; i < EXT2FS_NDADDR + EXT2FS_NIADDR; i++) {
            addr_ptr[i] = tsk_gets32(fs->endian, dino_buf->i_block[i]);
        }

        // For inline data we create the default attribute now
        ext4_load_attrs_inline(fs_file, ea_buf, ea_buf_len);
    } 
    else {
        TSK_DADDR_T *addr_ptr;
        addr_ptr = (TSK_DADDR_T *) fs_meta->content_ptr;
        for (i = 0; i < EXT2FS_NDADDR + EXT2FS_NIADDR; i++)
            addr_ptr[i] = tsk_gets32(fs->endian, dino_buf->i_block[i]);

        /* set the link string
         * the size check prevents us from trying to allocate a huge amount of
         * memory for a bad inode value
         */
        if ((fs_meta->type == TSK_FS_META_TYPE_LNK)
            && (fs_meta->size < EXT2FS_MAXPATHLEN) && (fs_meta->size >= 0)) {
            int i;

            if ((fs_meta->link =
                    tsk_malloc((size_t) (fs_meta->size + 1))) == NULL)
                return 1;

            /* it is located directly in the pointers */
            if (fs_meta->size < 4 * (EXT2FS_NDADDR + EXT2FS_NIADDR)) {
                unsigned int j;
                unsigned int count = 0;

                for (i = 0; i < (EXT2FS_NDADDR + EXT2FS_NIADDR) &&
                    count < fs_meta->size; i++) {
                    char *a_ptr = (char *) &dino_buf->i_block[i];
                    for (j = 0; j < 4 && count < fs_meta->size; j++) {
                        fs_meta->link[count++] = a_ptr[j];
                    }
                }
                fs_meta->link[count] = '\0';

                /* clear the content pointer data to avoid the prog from reading them */
                memset(fs_meta->content_ptr, 0, fs_meta->content_len);
            }

            /* it is in blocks */
            else {
                TSK_FS_INFO *fs = (TSK_FS_INFO *) & ext2fs->fs_info;
                char *data_buf = NULL;
                char *a_ptr = fs_meta->link;
                unsigned int total_read = 0;
                TSK_DADDR_T *addr_ptr = fs_meta->content_ptr;;

                if ((data_buf = tsk_malloc(fs->block_size)) == NULL) {
                    return 1;
                }

                /* we only need to do the direct blocks due to the limit
                 * on path length */
                for (i = 0; i < EXT2FS_NDADDR && total_read < fs_meta->size;
                    i++) {
                    ssize_t cnt;

                    cnt = tsk_fs_read_block(fs,
                        addr_ptr[i], data_buf, fs->block_size);

                    if (cnt != fs->block_size) {
                        if (cnt >= 0) {
                            tsk_error_reset();
                            tsk_error_set_errno(TSK_ERR_FS_READ);
                        }
                        tsk_error_set_errstr2
                            ("ext2fs_dinode_copy: symlink destination from %"
                            PRIuDADDR, addr_ptr[i]);
                        free(data_buf);
                        return 1;
                    }

                    int copy_len =
                        (fs_meta->size - total_read <
                        fs->block_size) ? (int) (fs_meta->size -
                        total_read) : (int) (fs->block_size);

                    memcpy(a_ptr, data_buf, copy_len);
                    total_read += copy_len;
                    a_ptr = (char *) ((uintptr_t) a_ptr + copy_len);
                }

                /* terminate the string */
                *a_ptr = '\0';
                free(data_buf);
            }

            /* Clean up name */
            i = 0;
            while (fs_meta->link[i] != '\0') {
                if (TSK_IS_CNTRL(fs_meta->link[i]))
                    fs_meta->link[i] = '^';
                i++;
            }
        }
    }

    /* Fill in the flags value */
    grp_num = (EXT2_GRPNUM_T) ((inum - fs->first_inum) /
        tsk_getu32(fs->endian, ext2fs->fs->s_inodes_per_group));


    tsk_take_lock(&ext2fs->lock);

    if (ext2fs_imap_load(ext2fs, grp_num)) {
        tsk_release_lock(&ext2fs->lock);
        return 1;
    }

    ibase =
        grp_num * tsk_getu32(fs->endian,
        ext2fs->fs->s_inodes_per_group) + fs->first_inum;


    /*
     * Ensure that inum - ibase refers to a valid bit offset in imap_buf.
     */
    if ((ibase > inum) || (inum - ibase) >= (fs->block_size * 8)) {
        tsk_release_lock(&ext2fs->lock);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_WALK_RNG);
        tsk_error_set_errstr("ext2fs_dinode_copy: Invalid offset into imap_buf (inum %" PRIuINUM " - ibase %" PRIuINUM ")",
            inum, ibase);
        return 1;
    }


    /*
     * Apply the allocated/unallocated restriction.
     */
    fs_meta->flags = (isset(ext2fs->imap_buf, inum - ibase) ?
        TSK_FS_META_FLAG_ALLOC : TSK_FS_META_FLAG_UNALLOC);

    tsk_release_lock(&ext2fs->lock);


    /*
     * Apply the used/unused restriction.
     */
    fs_meta->flags |= (fs_meta->ctime ?
        TSK_FS_META_FLAG_USED : TSK_FS_META_FLAG_UNUSED);

    return 0;
}



/* ext2fs_inode_lookup - lookup inode, external interface
 *
 * Returns 1 on error and 0 on success
 *
 */

static uint8_t
ext2fs_inode_lookup(TSK_FS_INFO * fs, TSK_FS_FILE * a_fs_file,
    TSK_INUM_T inum)
{
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) fs;
    ext2fs_inode *dino_buf = NULL;
    uint8_t *ea_buf = NULL;
    size_t ea_buf_len = 0;
    unsigned int size = 0;

    if (a_fs_file == NULL) {
        tsk_error_set_errno(TSK_ERR_FS_ARG);
        tsk_error_set_errstr("ext2fs_inode_lookup: fs_file is NULL");
        return 1;
    }

    if (a_fs_file->meta == NULL) {
        if ((a_fs_file->meta =
                tsk_fs_meta_alloc(EXT2FS_FILE_CONTENT_LEN)) == NULL)
            return 1;
    }
    else {
        tsk_fs_meta_reset(a_fs_file->meta);
    }

    // see if they are looking for the special "orphans" directory
    if (inum == TSK_FS_ORPHANDIR_INUM(fs)) {
        if (tsk_fs_dir_make_orphan_dir_meta(fs, a_fs_file->meta))
            return 1;
        else
            return 0;
    }

    size =
        ext2fs->inode_size >
        sizeof(ext2fs_inode) ? ext2fs->inode_size : sizeof(ext2fs_inode);
    if ((dino_buf = (ext2fs_inode *) tsk_malloc(size)) == NULL) {
        return 1;
    }

    if (ext2fs_dinode_load(ext2fs, inum, dino_buf, &ea_buf, &ea_buf_len)) {
        free(dino_buf);
        return 1;
    }

    if (ext2fs_dinode_copy(ext2fs, a_fs_file, inum, dino_buf, ea_buf, ea_buf_len)) {
        free(dino_buf);
        return 1;
    }

    free(dino_buf);
    return 0;
}



/* ext2fs_inode_walk - inode iterator
 *
 * flags used: TSK_FS_META_FLAG_USED, TSK_FS_META_FLAG_UNUSED,
 *  TSK_FS_META_FLAG_ALLOC, TSK_FS_META_FLAG_UNALLOC, TSK_FS_META_FLAG_ORPHAN
 *
 *  Return 1 on error and 0 on success
*/

uint8_t
ext2fs_inode_walk(TSK_FS_INFO * fs, TSK_INUM_T start_inum,
    TSK_INUM_T end_inum, TSK_FS_META_FLAG_ENUM flags,
    TSK_FS_META_WALK_CB a_action, void *a_ptr)
{
    char *myname = "extXfs_inode_walk";
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) fs;
    TSK_INUM_T inum;
    TSK_INUM_T end_inum_tmp;
    TSK_INUM_T ibase = 0;
    TSK_FS_FILE *fs_file;
    unsigned int myflags;
    ext2fs_inode *dino_buf = NULL;
    uint8_t *ea_buf = NULL;
    size_t ea_buf_len = 0;
    unsigned int size = 0;

    // clean up any error messages that are lying around
    tsk_error_reset();

    /*
     * Sanity checks.
     */
    if (start_inum < fs->first_inum || start_inum > fs->last_inum) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_WALK_RNG);
        tsk_error_set_errstr("%s: start inode: %" PRIuINUM "", myname,
            start_inum);
        return 1;
    }

    if (end_inum < fs->first_inum || end_inum > fs->last_inum
        || end_inum < start_inum) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_WALK_RNG);
        tsk_error_set_errstr("%s: end inode: %" PRIuINUM "", myname,
            end_inum);
        return 1;
    }

    /* If ORPHAN is wanted, then make sure that the flags are correct */
    if (flags & TSK_FS_META_FLAG_ORPHAN) {
        flags |= TSK_FS_META_FLAG_UNALLOC;
        flags &= ~TSK_FS_META_FLAG_ALLOC;
        flags |= TSK_FS_META_FLAG_USED;
        flags &= ~TSK_FS_META_FLAG_UNUSED;
    }
    else {
        if (((flags & TSK_FS_META_FLAG_ALLOC) == 0) &&
            ((flags & TSK_FS_META_FLAG_UNALLOC) == 0)) {
            flags |= (TSK_FS_META_FLAG_ALLOC | TSK_FS_META_FLAG_UNALLOC);
        }

        /* If neither of the USED or UNUSED flags are set, then set them
         * both
         */
        if (((flags & TSK_FS_META_FLAG_USED) == 0) &&
            ((flags & TSK_FS_META_FLAG_UNUSED) == 0)) {
            flags |= (TSK_FS_META_FLAG_USED | TSK_FS_META_FLAG_UNUSED);
        }
    }



    /* If we are looking for orphan files and have not yet filled
     * in the list of unalloc inodes that are pointed to, then fill
     * in the list
     */
    if ((flags & TSK_FS_META_FLAG_ORPHAN)) {
        if (tsk_fs_dir_load_inum_named(fs) != TSK_OK) {
            tsk_error_errstr2_concat
                ("- ext2fs_inode_walk: identifying inodes allocated by file names");
            return 1;
        }

    }

    fs_file = tsk_fs_file_alloc(fs);
    if (fs_file == NULL)
        return 1;

    fs_file->meta = tsk_fs_meta_alloc(EXT2FS_FILE_CONTENT_LEN);
    if (fs_file->meta == NULL) {
        free(fs_file);
        return 1;
    }

    // we need to handle fs->last_inum specially because it is for the
    // virtual ORPHANS directory.  Handle it outside of the loop.
    if (end_inum == TSK_FS_ORPHANDIR_INUM(fs))
        end_inum_tmp = end_inum - 1;
    else
        end_inum_tmp = end_inum;

    /*
     * Iterate.
     */
    size =
        ext2fs->inode_size >
        sizeof(ext2fs_inode) ? ext2fs->inode_size : sizeof(ext2fs_inode);

    dino_buf = (ext2fs_inode *) tsk_malloc(size);
    if (dino_buf == NULL) {
        free(fs_file->meta);
        free(fs_file);
        return 1;
    }

    for (inum = start_inum; inum <= end_inum_tmp; inum++) {
        int retval;
        EXT2_GRPNUM_T grp_num;

        /*
         * Be sure to use the proper group descriptor data. XXX Linux inodes
         * start at 1, as in Fortran.
         */
        grp_num =
            (EXT2_GRPNUM_T) ((inum - 1) / tsk_getu32(fs->endian,
                ext2fs->fs->s_inodes_per_group));

        /* lock access to imap_buf */
        tsk_take_lock(&ext2fs->lock);

        if (ext2fs_imap_load(ext2fs, grp_num)) {
            tsk_release_lock(&ext2fs->lock);
            free(dino_buf);
            tsk_fs_file_close(fs_file);
            return 1;
        }
        ibase =
            grp_num * tsk_getu32(fs->endian,
            ext2fs->fs->s_inodes_per_group) + 1;

        /*
         * Ensure that inum - ibase refers to a valid bit offset in imap_buf.
         */
        if ((ibase > inum) || (inum - ibase) >= (fs->block_size * 8)) {
            tsk_release_lock(&ext2fs->lock);
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_WALK_RNG);
            tsk_error_set_errstr("%s: Invalid offset into imap_buf (inum %" PRIuINUM " - ibase %" PRIuINUM ")",
                myname, inum, ibase);
            return 1;
        }

        /*
         * Apply the allocated/unallocated restriction.
         */
        myflags = (isset(ext2fs->imap_buf, inum - ibase) ?
            TSK_FS_META_FLAG_ALLOC : TSK_FS_META_FLAG_UNALLOC);

        tsk_release_lock(&ext2fs->lock);

        if ((flags & myflags) != myflags)
            continue;

        if (ext2fs_dinode_load(ext2fs, inum, dino_buf, &ea_buf, &ea_buf_len)) {
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 1;
        }


        /*
         * Apply the used/unused restriction.
         */
        myflags |= (tsk_getu32(fs->endian, dino_buf->i_ctime) ?
            TSK_FS_META_FLAG_USED : TSK_FS_META_FLAG_UNUSED);

        if ((flags & myflags) != myflags)
            continue;

        /* If we want only orphans, then check if this
         * inode is in the seen list
         */
        if ((myflags & TSK_FS_META_FLAG_UNALLOC) &&
            (flags & TSK_FS_META_FLAG_ORPHAN) &&
            (tsk_fs_dir_find_inum_named(fs, inum))) {
            continue;
        }


        /*
         * Fill in a file system-independent inode structure and pass control
         * to the application.
         */
        if (ext2fs_dinode_copy(ext2fs, fs_file, inum, dino_buf, ea_buf, ea_buf_len)) {
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 1;
        }

        retval = a_action(fs_file, a_ptr);
        if (retval == TSK_WALK_STOP) {
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 0;
        }
        else if (retval == TSK_WALK_ERROR) {
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 1;
        }
    }

    // handle the virtual orphans folder if they asked for it
    if ((end_inum == TSK_FS_ORPHANDIR_INUM(fs))
        && (flags & TSK_FS_META_FLAG_ALLOC)
        && (flags & TSK_FS_META_FLAG_USED)) {
        int retval;

        if (tsk_fs_dir_make_orphan_dir_meta(fs, fs_file->meta)) {
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 1;
        }
        /* call action */
        retval = a_action(fs_file, a_ptr);
        if (retval == TSK_WALK_STOP) {
            tsk_fs_file_close(fs_file);
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 0;
        }
        else if (retval == TSK_WALK_ERROR) {
            free(dino_buf);
            tsk_fs_file_close(fs_file);

            return 1;
        }
    }

    /*
     * Cleanup.
     */
    free(dino_buf);
    tsk_fs_file_close(fs_file);

    return 0;
}



TSK_FS_BLOCK_FLAG_ENUM
ext2fs_block_getflags(TSK_FS_INFO * a_fs, TSK_DADDR_T a_addr)
{
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) a_fs;
    int flags;
    EXT2_GRPNUM_T grp_num;
    TSK_DADDR_T dbase = 0;      /* first block number in group */
    TSK_DADDR_T dmin = 0;       /* first block after inodes */

    // these blocks are not described in the group descriptors
    // sparse
    if (a_addr == 0)
        return TSK_FS_BLOCK_FLAG_CONT | TSK_FS_BLOCK_FLAG_ALLOC;
    if (a_addr < ext2fs->first_data_block)
        return TSK_FS_BLOCK_FLAG_META | TSK_FS_BLOCK_FLAG_ALLOC;

    grp_num = ext2_dtog_lcl(a_fs, ext2fs->fs, a_addr);

    /* lock access to bmap_buf */
    tsk_take_lock(&ext2fs->lock);

    /* Lookup bitmap if not loaded */
    if (ext2fs_bmap_load(ext2fs, grp_num)) {
        tsk_release_lock(&ext2fs->lock);
        return 0;
    }

    /*
     * Be sure to use the right group descriptor information. XXX There
     * appears to be an off-by-one discrepancy between bitmap offsets and
     * disk block numbers.
     *
     * Addendum: this offset is controlled by the super block's
     * s_first_data_block field.
     */
    dbase = ext2_cgbase_lcl(a_fs, ext2fs->fs, grp_num);
    flags = (isset(ext2fs->bmap_buf, a_addr - dbase) ?
        TSK_FS_BLOCK_FLAG_ALLOC : TSK_FS_BLOCK_FLAG_UNALLOC);
    
    /*
     *  Identify meta blocks
     * (any blocks that can't be allocated for file/directory data).
     *
     * XXX With sparse superblock placement, most block groups have the
     * block and inode bitmaps where one would otherwise find the backup
     * superblock and the backup group descriptor blocks. The inode
     * blocks are in the normal place, though. This leaves little gaps
     * between the bitmaps and the inode table - and ext2fs will use
     * those blocks for file/directory data blocks. So we must properly
     * account for those gaps between meta blocks.
     *
     * Thus, superblocks and group descriptor blocks are sometimes overlaid
     * by bitmap blocks. This means that one can still assume that the
     * locations of superblocks and group descriptor blocks are reserved.
     * They just happen to be reserved for something else :-)
     */

    if (ext2fs->ext4_grp_buf != NULL) {
        dmin = ext4_getu64(a_fs->endian, ext2fs->ext4_grp_buf->bg_inode_table_hi,
                    ext2fs->ext4_grp_buf->bg_inode_table_lo) + + INODE_TABLE_SIZE(ext2fs);

        if ((a_addr >= dbase
                && a_addr < ext4_getu64(a_fs->endian, 
                ext2fs->ext4_grp_buf->bg_block_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_block_bitmap_lo))
            || (a_addr == ext4_getu64(a_fs->endian, 
                ext2fs->ext4_grp_buf->bg_block_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_block_bitmap_lo))
            || (a_addr == ext4_getu64(a_fs->endian, 
                ext2fs->ext4_grp_buf->bg_inode_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_lo))
            || (a_addr >= ext4_getu64(a_fs->endian, 
                ext2fs->ext4_grp_buf->bg_inode_table_hi,
                ext2fs->ext4_grp_buf->bg_inode_table_lo)
                && a_addr < dmin))
            flags |= TSK_FS_BLOCK_FLAG_META;
        else
            flags |= TSK_FS_BLOCK_FLAG_CONT;

    }
    else {
        dmin =
            tsk_getu32(a_fs->endian,
            ext2fs->grp_buf->bg_inode_table) + INODE_TABLE_SIZE(ext2fs);

        if ((a_addr >= dbase
                && a_addr < tsk_getu32(a_fs->endian,
                    ext2fs->grp_buf->bg_block_bitmap))
            || (a_addr == tsk_getu32(a_fs->endian,
                    ext2fs->grp_buf->bg_block_bitmap))
            || (a_addr == tsk_getu32(a_fs->endian,
                    ext2fs->grp_buf->bg_inode_bitmap))
            || (a_addr >= tsk_getu32(a_fs->endian,
                    ext2fs->grp_buf->bg_inode_table)
                && a_addr < dmin))
            flags |= TSK_FS_BLOCK_FLAG_META;
        else
            flags |= TSK_FS_BLOCK_FLAG_CONT;
    }
    
    tsk_release_lock(&ext2fs->lock);
    return (TSK_FS_BLOCK_FLAG_ENUM)flags;
}


/* ext2fs_block_walk - block iterator
 *
 * flags: TSK_FS_BLOCK_FLAG_ALLOC, TSK_FS_BLOCK_FLAG_UNALLOC, TSK_FS_BLOCK_FLAG_CONT,
 *  TSK_FS_BLOCK_FLAG_META
 *
 *  Return 1 on error and 0 on success
*/

uint8_t
ext2fs_block_walk(TSK_FS_INFO * a_fs, TSK_DADDR_T a_start_blk,
    TSK_DADDR_T a_end_blk, TSK_FS_BLOCK_WALK_FLAG_ENUM a_flags,
    TSK_FS_BLOCK_WALK_CB a_action, void *a_ptr)
{
    char *myname = "extXfs_block_walk";
    TSK_FS_BLOCK *fs_block;
    TSK_DADDR_T addr;

    // clean up any error messages that are lying around
    tsk_error_reset();

    /*
     * Sanity checks.
     */
    if (a_start_blk < a_fs->first_block || a_start_blk > a_fs->last_block) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_WALK_RNG);
        tsk_error_set_errstr("%s: start block: %" PRIuDADDR, myname,
            a_start_blk);
        return 1;
    }
    if (a_end_blk < a_fs->first_block || a_end_blk > a_fs->last_block
        || a_end_blk < a_start_blk) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_WALK_RNG);
        tsk_error_set_errstr("%s: end block: %" PRIuDADDR, myname,
            a_end_blk);
        return 1;
    }

    /* Sanity check on a_flags -- make sure at least one ALLOC is set */
    if (((a_flags & TSK_FS_BLOCK_WALK_FLAG_ALLOC) == 0) &&
        ((a_flags & TSK_FS_BLOCK_WALK_FLAG_UNALLOC) == 0)) {
        a_flags |=
            (TSK_FS_BLOCK_WALK_FLAG_ALLOC |
            TSK_FS_BLOCK_WALK_FLAG_UNALLOC);
    }
    if (((a_flags & TSK_FS_BLOCK_WALK_FLAG_META) == 0) &&
        ((a_flags & TSK_FS_BLOCK_WALK_FLAG_CONT) == 0)) {
        a_flags |=
            (TSK_FS_BLOCK_WALK_FLAG_CONT | TSK_FS_BLOCK_WALK_FLAG_META);
    }


    if ((fs_block = tsk_fs_block_alloc(a_fs)) == NULL) {
        return 1;
    }

    /*
     * Iterate. This is not as tricky as it could be, because the free list
     * map covers the entire disk partition, including blocks occupied by
     * group descriptor blocks, bit maps, and other non-data blocks.
     */
    for (addr = a_start_blk; addr <= a_end_blk; addr++) {
        int retval;
        int myflags;

        myflags = ext2fs_block_getflags(a_fs, addr);

        // test if we should call the callback with this one
        if ((myflags & TSK_FS_BLOCK_FLAG_META)
            && (!(a_flags & TSK_FS_BLOCK_WALK_FLAG_META)))
            continue;
        else if ((myflags & TSK_FS_BLOCK_FLAG_CONT)
            && (!(a_flags & TSK_FS_BLOCK_WALK_FLAG_CONT)))
            continue;
        else if ((myflags & TSK_FS_BLOCK_FLAG_ALLOC)
            && (!(a_flags & TSK_FS_BLOCK_WALK_FLAG_ALLOC)))
            continue;
        else if ((myflags & TSK_FS_BLOCK_FLAG_UNALLOC)
            && (!(a_flags & TSK_FS_BLOCK_WALK_FLAG_UNALLOC)))
            continue;

        if (a_flags & TSK_FS_BLOCK_WALK_FLAG_AONLY)
            myflags |= TSK_FS_BLOCK_FLAG_AONLY;

        if (tsk_fs_block_get_flag(a_fs, fs_block, addr, myflags) == NULL) {
            tsk_error_set_errstr2("ext2fs_block_walk: block %" PRIuDADDR,
                addr);
            tsk_fs_block_free(fs_block);
            return 1;
        }

        retval = a_action(fs_block, a_ptr);
        if (retval == TSK_WALK_STOP) {
            break;
        }
        else if (retval == TSK_WALK_ERROR) {
            tsk_fs_block_free(fs_block);
            return 1;
        }
    }

    /*
     * Cleanup.
     */
    tsk_fs_block_free(fs_block);
    return 0;
}

static uint8_t
ext2fs_fscheck(TSK_FS_INFO * fs, FILE * hFile)
{
    tsk_error_reset();
    tsk_error_set_errno(TSK_ERR_FS_UNSUPFUNC);
    tsk_error_set_errstr("fscheck not implemented yet for Ext3");
    return 1;
}

/** \internal
 * Add a single extent -- that is, a single data ran -- to the file data attribute.
 * @return 0 on success, 1 on error.
 */
static TSK_OFF_T
ext2fs_make_data_run_extent(TSK_FS_INFO * fs_info, TSK_FS_ATTR * fs_attr,
    ext2fs_extent * extent)
{
    TSK_FS_ATTR_RUN *data_run;
    data_run = tsk_fs_attr_run_alloc();
    if (data_run == NULL) {
        return 1;
    }

    data_run->offset = tsk_getu32(fs_info->endian, extent->ee_block);

    // Check if the extent is initialized or uninitialized
    if (tsk_getu16(fs_info->endian, extent->ee_len) <= EXT2_MAX_INIT_EXTENT_LENGTH) {
        // Extent is initalized - process normally
        data_run->addr =
            (((uint32_t)tsk_getu16(fs_info->endian,
                extent->ee_start_hi)) << 16) | tsk_getu32(fs_info->endian,
                    extent->ee_start_lo);
        data_run->len = tsk_getu16(fs_info->endian, extent->ee_len);
    }
    else {
        // Extent is uninitialized - make a sparse run
        data_run->len = tsk_getu16(fs_info->endian, extent->ee_len) - EXT2_MAX_INIT_EXTENT_LENGTH;
        data_run->addr = 0;
        data_run->flags = TSK_FS_ATTR_RUN_FLAG_SPARSE;
    }

    // save the run
    if (tsk_fs_attr_add_run(fs_info, fs_attr, data_run)) {
        tsk_fs_attr_run_free(data_run);
        return 1;
    }

    return 0;
}


/** \internal
 * Given a block that contains an extent node (which starts with extent_header),
 * walk it, and add everything encountered to the appropriate attributes.
 * @return 0 on success, 1 on error.
 */
static TSK_OFF_T
ext2fs_make_data_run_extent_index(TSK_FS_INFO * fs_info,
    TSK_FS_ATTR * fs_attr, TSK_FS_ATTR * fs_attr_extent,
    TSK_DADDR_T idx_block)
{
    ext2fs_extent_header *header;
    TSK_FS_ATTR_RUN *data_run;
    uint8_t *buf;
    ssize_t cnt;
    unsigned int i;

    /* first, read the block specified by the parameter */
    int fs_blocksize = fs_info->block_size;
    if ((buf = (uint8_t *) tsk_malloc(fs_blocksize)) == NULL) {
        return 1;
    }

    cnt =
        tsk_fs_read_block(fs_info, idx_block, (char *) buf, fs_blocksize);
    if (cnt != fs_blocksize) {
        if (cnt >= 0) {
            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_READ);
        }
        tsk_error_set_errstr("ext2fs_make_data_run_extent_index: Block %"
            PRIuDADDR, idx_block);
        free(buf);
        return 1;
    }
    header = (ext2fs_extent_header *) buf;

    /* add it to the extent attribute */
    if (tsk_getu16(fs_info->endian, header->eh_magic) != 0xF30A) {
        tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
        tsk_error_set_errstr
            ("ext2fs_make_data_run_extent_index: extent header magic valid incorrect!");
        free(buf);
        return 1;
    }

    data_run = tsk_fs_attr_run_alloc();
    if (data_run == NULL) {
        free(buf);
        return 1;
    }
    data_run->addr = idx_block;
    data_run->len = fs_blocksize;

    if (tsk_fs_attr_add_run(fs_info, fs_attr_extent, data_run)) {
        tsk_fs_attr_run_free(data_run);
        free(buf);
        return 1;
    }

    /* process leaf nodes */
    if (tsk_getu16(fs_info->endian, header->eh_depth) == 0) {
        uint16_t num_entries = tsk_getu16(fs_info->endian, header->eh_entries);

        // Ensure buf is sufficiently large
        // Otherwise extents[i] below can cause an OOB read
        if (((unsigned long)fs_blocksize < sizeof(ext2fs_extent_header)) || (num_entries > (fs_blocksize - sizeof(ext2fs_extent_header)) / sizeof(ext2fs_extent))) {
            free(buf);
            return 1;
        }
        ext2fs_extent *extents = (ext2fs_extent *) (header + 1);
        for (i = 0; i < num_entries; i++) {
            ext2fs_extent extent = extents[i];
            if (ext2fs_make_data_run_extent(fs_info, fs_attr, &extent)) {
                free(buf);
                return 1;
            }
        }
    }
    /* recurse on interior nodes */
    else {
        uint16_t num_entries = tsk_getu16(fs_info->endian, header->eh_entries);

        // Ensure buf is sufficiently large
        // Otherwise indices[i] below can cause an OOB read
        if (((unsigned long)fs_blocksize < sizeof(ext2fs_extent_header)) || (num_entries > (fs_blocksize - sizeof(ext2fs_extent_header)) / sizeof(ext2fs_extent_idx))) {
            free(buf);
            return 1;
        }
        ext2fs_extent_idx *indices = (ext2fs_extent_idx *) (header + 1);
        for (i = 0; i < num_entries; i++) {
            ext2fs_extent_idx *index = &indices[i];
            TSK_DADDR_T child_block =
                (((uint32_t) tsk_getu16(fs_info->endian,
                        index->ei_leaf_hi)) << 16) | tsk_getu32(fs_info->
                endian, index->ei_leaf_lo);
            if (ext2fs_make_data_run_extent_index(fs_info, fs_attr,
                    fs_attr_extent, child_block)) {
                free(buf);
                return 1;
            }
        }
    }

    free(buf);
    return 0;
}

/** \internal
 * Get the number of extent blocks rooted at the given extent_header.
 * The count does not include the extent header passed as a parameter.
 *
 * @return the number of extent blocks, or -1 on error.
 */
static int32_t
ext2fs_extent_tree_index_count(TSK_FS_INFO * fs_info,
    TSK_FS_META * fs_meta, ext2fs_extent_header * header, int recursion_depth)
{
    int fs_blocksize = fs_info->block_size;
    ext2fs_extent_idx *indices;
    int count = 0;
    uint8_t *buf;
    int i;

    // 32 is an arbitrary chosen value.
    if (recursion_depth > 32) {
        tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
        tsk_error_set_errstr
            ("ext2fs_load_attrs: exceeded maximum recursion depth!");
        return -1;
    }
    if (tsk_getu16(fs_info->endian, header->eh_magic) != 0xF30A) {
        tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
        tsk_error_set_errstr
            ("ext2fs_load_attrs: extent header magic valid incorrect!");
        return -1;
    }

    if (tsk_getu16(fs_info->endian, header->eh_depth) == 0) {
        return 0;
    }

    buf = (uint8_t *) tsk_malloc(fs_blocksize);
    if (buf == NULL) {
        return -1;
    }

    indices = (ext2fs_extent_idx *) (header + 1);
    for (i = 0; i < tsk_getu16(fs_info->endian, header->eh_entries); i++) {
        ext2fs_extent_idx *index = &indices[i];
        TSK_DADDR_T block =
            (((uint32_t) tsk_getu16(fs_info->endian,
                    index->ei_leaf_hi)) << 16) | tsk_getu32(fs_info->
            endian, index->ei_leaf_lo);
        ssize_t cnt =
            tsk_fs_read_block(fs_info, block, (char *) buf, fs_blocksize);
        int ret;

        if (cnt != fs_blocksize) {
            if (cnt >= 0) {
                tsk_error_reset();
                tsk_error_set_errno(TSK_ERR_FS_READ);
            }
            tsk_error_set_errstr2("ext2fs_extent_tree_index_count: Block %"
                PRIuDADDR, block);
            free(buf);
            return -1;
        }

        if ((ret =
                ext2fs_extent_tree_index_count(fs_info, fs_meta,
                    (ext2fs_extent_header *) buf, recursion_depth + 1)) < 0) {
            free(buf);
            return -1;
        }
        count += ret;
        count++;
    }

    free(buf);
    return count;
}

/** \internal
* If the file length is longer than what is in the attr runs, add a sparse
* data run to cover the rest of the file.
*
* @return 0 if successful or 1 on error.
*/
static uint8_t
ext2fs_handle_implicit_sparse_data_run(TSK_FS_INFO * fs_info, TSK_FS_ATTR * fs_attr) {
    TSK_FS_FILE *fs_file = fs_attr->fs_file;

    if (fs_file == NULL) {
        return 1;
    }

    TSK_DADDR_T end_of_runs;
    TSK_DADDR_T total_file_blocks = roundup(fs_file->meta->size, fs_info->block_size) / fs_info->block_size;

    if (fs_attr->nrd.run_end) {
        end_of_runs = fs_attr->nrd.run_end->offset + fs_attr->nrd.run_end->len;
    }
    else {
        end_of_runs = 0;
    }

    if (end_of_runs < total_file_blocks) {
        // Make sparse run.
        TSK_FS_ATTR_RUN *data_run;
        data_run = tsk_fs_attr_run_alloc();
        if (data_run == NULL) {
            return 1;
        }
        data_run->offset = end_of_runs;
        data_run->addr = 0;
        data_run->len = total_file_blocks - end_of_runs;
        data_run->flags = TSK_FS_ATTR_RUN_FLAG_SPARSE;

        // Save the run.
        if (tsk_fs_attr_add_run(fs_info, fs_attr, data_run)) {

            return 1;
        }
    }
    return 0;
}

/**
 * \internal
 * Loads attribute for Ext4 Extents-based storage method.
 * @param fs_file File system to analyze
 * @returns 0 on success, 1 otherwise
 */
static uint8_t
ext4_load_attrs_extents(TSK_FS_FILE *fs_file)
{
    TSK_FS_META *fs_meta = fs_file->meta;
    TSK_FS_INFO *fs_info = fs_file->fs_info;
    TSK_OFF_T length = 0;
    TSK_FS_ATTR *fs_attr;
    int i;
    ext2fs_extent *extents = NULL;
    ext2fs_extent_idx *indices = NULL;
    
    ext2fs_extent_header *header = (ext2fs_extent_header *) fs_meta->content_ptr;
    uint16_t num_entries = tsk_getu16(fs_info->endian, header->eh_entries);
    uint16_t depth = tsk_getu16(fs_info->endian, header->eh_depth);
    
    if (tsk_getu16(fs_info->endian, header->eh_magic) != 0xF30A) {
        tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
        tsk_error_set_errstr
        ("ext2fs_load_attrs: extent header magic valid incorrect!");
        return 1;
    }
    
    if ((fs_meta->attr != NULL)
        && (fs_meta->attr_state == TSK_FS_META_ATTR_STUDIED)) {
        return 0;
    }
    else if (fs_meta->attr_state == TSK_FS_META_ATTR_ERROR) {
        return 1;
    }

    if (fs_meta->attr != NULL) {
        tsk_fs_attrlist_markunused(fs_meta->attr);
    }
    else {
        fs_meta->attr = tsk_fs_attrlist_alloc();
    }
    
    if (TSK_FS_TYPE_ISEXT(fs_info->ftype) == 0) {
        tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
        tsk_error_set_errstr
        ("ext2fs_load_attr: Called with non-ExtX file system: %x",
         fs_info->ftype);
        return 1;
    }
    
    length = roundup(fs_meta->size, fs_info->block_size);

    if ((fs_attr =
         tsk_fs_attrlist_getnew(fs_meta->attr,
                                TSK_FS_ATTR_NONRES)) == NULL) {
        return 1;
    }
    
    if (tsk_fs_attr_set_run(fs_file, fs_attr, NULL, NULL,
                            TSK_FS_ATTR_TYPE_DEFAULT, TSK_FS_ATTR_ID_DEFAULT,
                            fs_meta->size, fs_meta->size, length, 0, 0)) {
        return 1;
    }
    
    if (num_entries == 0) {
        if (fs_meta->size == 0) {
            // Empty file
            fs_meta->attr_state = TSK_FS_META_ATTR_STUDIED;
            return 0;
        }

        // The entire file is sparse
        if (ext2fs_handle_implicit_sparse_data_run(fs_info, fs_attr)) {
            return 1;
        }

        fs_meta->attr_state = TSK_FS_META_ATTR_STUDIED;
        return 0;
    }
    
    if (depth == 0) {       /* leaf node */
        // Ensure fs_meta->content_ptr is sufficiently large
        // Otherwise extents[i] below can cause an OOB read
        if ((fs_meta->content_len < sizeof(ext2fs_extent_header)) || (num_entries > (fs_meta->content_len - sizeof(ext2fs_extent_header)) / sizeof(ext2fs_extent))) {
            tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
            tsk_error_set_errstr
            ("ext2fs_load_attr: Inode reports too many extents");
            return 1;
        }
        
        extents = (ext2fs_extent *) (header + 1);
        for (i = 0; i < num_entries; i++) {
            ext2fs_extent extent = extents[i];
            if (ext2fs_make_data_run_extent(fs_info, fs_attr, &extent)) {
                return 1;
            }
        }
    }
    else {                  /* interior node */
        TSK_FS_ATTR *fs_attr_extent;
        int32_t extent_index_size;

        // Ensure fs_meta->content_ptr is sufficiently large
        // Otherwise indices[i] below can cause an OOB read
        if ((fs_meta->content_len < sizeof(ext2fs_extent_header)) || (num_entries > (fs_meta->content_len - sizeof(ext2fs_extent_header)) / sizeof(ext2fs_extent_idx))) {
            tsk_error_set_errno(TSK_ERR_FS_INODE_COR);
            tsk_error_set_errstr
            ("ext2fs_load_attr: Inode reports too many extent indices");
            return 1;
        }

        if ((fs_attr_extent =
             tsk_fs_attrlist_getnew(fs_meta->attr,
                                    TSK_FS_ATTR_NONRES)) == NULL) {
             return 1;
         }
        
        extent_index_size =
        ext2fs_extent_tree_index_count(fs_info, fs_meta, header, 0);
        if (extent_index_size < 0) {
            return 1;
        }
        
        if (tsk_fs_attr_set_run(fs_file, fs_attr_extent, NULL, NULL,
                                TSK_FS_ATTR_TYPE_UNIX_EXTENT, TSK_FS_ATTR_ID_DEFAULT,
                                fs_info->block_size * extent_index_size,
                                fs_info->block_size * extent_index_size,
                                fs_info->block_size * extent_index_size, 0, 0)) {
            return 1;
        }
        
        indices = (ext2fs_extent_idx *) (header + 1);
        for (i = 0; i < num_entries; i++) {
            ext2fs_extent_idx *index = &indices[i];
            TSK_DADDR_T child_block =
            (((uint32_t) tsk_getu16(fs_info->endian,
                                    index->
                                    ei_leaf_hi)) << 16) | tsk_getu32(fs_info->
                                                                     endian, index->ei_leaf_lo);
            if (ext2fs_make_data_run_extent_index(fs_info, fs_attr,
                                                  fs_attr_extent, child_block)) {
                return 1;
            }
        }
    }

    // There may be implicit sparse blocks at the end of the file
    if (ext2fs_handle_implicit_sparse_data_run(fs_info, fs_attr)) {
        return 1;
    }
    
    fs_meta->attr_state = TSK_FS_META_ATTR_STUDIED;
    
    return 0;
}

/** \internal
 * Add the data runs and extents to the file attributes.
 *
 * @param fs_file File system to analyze
 * @returns 0 on success, 1 otherwise
 */
static uint8_t
ext2fs_load_attrs(TSK_FS_FILE * fs_file)
{
    /* EXT4 extents-based storage is dealt with differently than
     * the traditional pointer lists. */
    if (fs_file->meta->content_type == TSK_FS_META_CONTENT_TYPE_EXT4_EXTENTS) {
        return ext4_load_attrs_extents(fs_file);
    }
    else if (fs_file->meta->content_type == TSK_FS_META_CONTENT_TYPE_EXT4_INLINE) {
        // Inline attributes are loaded in dinode_copy
        return 0;
    }
    else {
        return tsk_fs_unix_make_data_run(fs_file);
    }
}


static void
ext4_fsstat_datablock_helper(TSK_FS_INFO * fs, FILE * hFile,
    unsigned int i, TSK_DADDR_T cg_base, int gd_size)
{
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) fs;
    ext2fs_sb *sb = ext2fs->fs;
    unsigned int gpfbg = (1 << sb->s_log_groups_per_flex);
    unsigned int ibpg, gd_blocks;
    unsigned int num_flex_bg, curr_flex_bg;
    uint64_t last_block;
    ext4fs_gd *ext4_gd = ext2fs->ext4_grp_buf;
    uint64_t db_offset = 0;

    if (ext4_gd == NULL) {
        return;
    }

#ifdef Ext4_DBG
    printf("\nDEBUG 64bit:%d, gd_size %d, combined %d\n",
        EXT2FS_HAS_INCOMPAT_FEATURE(fs, sb, EXT2FS_FEATURE_INCOMPAT_64BIT),
        gd_size >= 64,
        EXT2FS_HAS_INCOMPAT_FEATURE(fs, sb, EXT2FS_FEATURE_INCOMPAT_64BIT)
        && gd_size >= 64);
#endif
    /* number of blocks the inodes consume */
    ibpg =
        (tsk_getu32(fs->endian,
            sb->s_inodes_per_group) * ext2fs->inode_size + fs->block_size -
        1) / fs->block_size;
    /* number of blocks group descriptors consume */
    gd_blocks =
        (unsigned int)((gd_size * ext2fs->groups_count + fs->block_size -
        1) / fs->block_size);
    num_flex_bg = (unsigned int)(ext2fs->groups_count / gpfbg);
    if (ext2fs->groups_count % gpfbg)
        num_flex_bg++;
    curr_flex_bg = i / gpfbg;

    last_block =
        cg_base + tsk_getu32(fs->endian, sb->s_blocks_per_group) - 1;
    if (last_block > fs->last_block) {
        last_block = fs->last_block;
    }

//DEBUG printf("ibpg %d  cur_flex: %d, flex_bgs: %d : %d, %d",ibpg, i/gpfbg, num_flex_bg, ext2fs->groups_count/gpfbg, ext2fs->groups_count%gpfbg);

#ifdef Ext4_DBG
    printf("\nDEBUG: Flex BG PROCESSING cg_base: %" PRIuDADDR
        ", gpfbg: %d, ibpg: %d \n", cg_base, gpfbg, ibpg);
#endif
    /*If this is the 1st bg in a flex bg then it contains the bitmaps and inode tables */
    if (i % gpfbg == 0) {
        if (curr_flex_bg == (num_flex_bg - 1)) {
            unsigned int num_groups = 0;
            unsigned int left_over = 0;

            num_groups = (unsigned int)
                (fs->last_block / tsk_getu32(fs->endian,
                sb->s_blocks_per_group));
            if (num_groups % tsk_getu32(fs->endian,
                    sb->s_blocks_per_group))
                num_groups++;
            left_over = (num_groups % gpfbg);
            
            tsk_fprintf(hFile, "    Uninit Data Bitmaps: ");
            tsk_fprintf(hFile, "%" PRIu64 " - %" PRIu64 "\n",
                ext4_getu64(fs->endian, ext4_gd->bg_block_bitmap_hi,
                    ext2fs->ext4_grp_buf->bg_block_bitmap_lo)
                + (left_over), ext4_getu64(fs->endian,
                    ext4_gd->bg_block_bitmap_hi,
                    ext2fs->ext4_grp_buf->bg_block_bitmap_lo)
                + gpfbg - 1);
            tsk_fprintf(hFile, "    Uninit Inode Bitmaps: ");
            tsk_fprintf(hFile, "%" PRIu64 " - %" PRIu64 "\n",
                ext4_getu64(fs->endian, ext4_gd->bg_inode_bitmap_hi,
                    ext2fs->ext4_grp_buf->bg_inode_bitmap_lo)
                + (left_over), ext4_getu64(fs->endian,
                    ext4_gd->bg_inode_bitmap_hi,
                    ext2fs->ext4_grp_buf->bg_inode_bitmap_lo)
                + gpfbg - 1);
            tsk_fprintf(hFile, "    Uninit Inode Table: ");
            tsk_fprintf(hFile, "%" PRIu64 " - %" PRIu64 "\n",
                ext4_getu64(fs->endian, ext4_gd->bg_inode_table_hi,
                    ext2fs->ext4_grp_buf->bg_inode_table_lo)
                + ((left_over) * ibpg), ext4_getu64(fs->endian,
                    ext4_gd->bg_inode_table_hi,
                    ext2fs->ext4_grp_buf->bg_inode_table_lo)
                + (gpfbg * ibpg) - 1);
            
        }
        tsk_fprintf(hFile, "    Data Blocks: ");
        db_offset = 0;
        if (ext2fs_is_super_bg(tsk_getu32(fs->endian,
                    sb->s_feature_ro_compat), i)) {
            db_offset = cg_base + (gpfbg * 2)   //To account for the bitmaps
                + (ibpg * gpfbg)        //Combined inode tables
                + tsk_getu16(fs->endian, ext2fs->fs->pad_or_gdt.s_reserved_gdt_blocks) + gd_blocks      //group descriptors
                + 1;            //superblock
        }
        else {
            db_offset = cg_base + (gpfbg * 2)   //To account for the bitmaps
                + (ibpg * gpfbg);       //Combined inode tables
        }
        tsk_fprintf(hFile, "%" PRIuDADDR " - %" PRIuDADDR "\n",
            db_offset, last_block);
    }
    else {
        tsk_fprintf(hFile, "    Data Blocks: ");
        db_offset = 0;
        if (ext2fs_is_super_bg(tsk_getu32(fs->endian,
                    sb->s_feature_ro_compat), i)) {
            db_offset = cg_base + tsk_getu16(fs->endian, ext2fs->fs->pad_or_gdt.s_reserved_gdt_blocks) + gd_blocks      //group descriptors
                + 1;            //superblock
        }
        else {
            db_offset = cg_base;
        }
        tsk_fprintf(hFile, "%" PRIuDADDR " - %" PRIuDADDR "\n",
            db_offset, last_block);
    }

}

/**
 * Print details about the file system to a file handle.
 *
 * @param fs File system to print details on
 * @param hFile File handle to print text to
 *
 * @returns 1 on error and 0 on success
 */
static uint8_t
ext2fs_fsstat(TSK_FS_INFO * fs, FILE * hFile)
{
    unsigned int i;
//    unsigned int gpfbg;
//    unsigned int gd_blocks;
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) fs;
    ext2fs_sb *sb = ext2fs->fs;
    int ibpg;
    int gd_size;
    time_t tmptime;
    char timeBuf[128];
    const char *tmptypename;


    // clean up any error messages that are lying around
    tsk_error_reset();

    tsk_fprintf(hFile, "FILE SYSTEM INFORMATION\n");
    tsk_fprintf(hFile, "--------------------------------------------\n");

    switch (fs->ftype) {
    case TSK_FS_TYPE_EXT3:
        tmptypename = "Ext3";
        gd_size = sizeof(ext2fs_gd);
        break;
    case TSK_FS_TYPE_EXT4:
        tmptypename = "Ext4";
        if (EXT2FS_HAS_INCOMPAT_FEATURE(fs, sb,
                EXT2FS_FEATURE_INCOMPAT_64BIT))
            gd_size = sizeof(ext4fs_gd);
        else
            gd_size = sizeof(ext2fs_gd);
        break;
    default:
        tmptypename = "Ext2";
        gd_size = sizeof(ext2fs_gd);
    }
    tsk_fprintf(hFile, "File System Type: %s\n", tmptypename);
    tsk_fprintf(hFile, "Volume Name: %s\n", sb->s_volume_name);
    tsk_fprintf(hFile, "Volume ID: %" PRIx64 "%" PRIx64 "\n",
        tsk_getu64(fs->endian, &sb->s_uuid[8]), tsk_getu64(fs->endian,
            &sb->s_uuid[0]));

    tmptime = tsk_getu32(fs->endian, sb->s_wtime);
    tsk_fprintf(hFile, "\nLast Written at: %s\n",
        (tmptime > 0) ? tsk_fs_time_to_str(tmptime, timeBuf) : "empty");
    tmptime = tsk_getu32(fs->endian, sb->s_lastcheck);
    tsk_fprintf(hFile, "Last Checked at: %s\n",
        (tmptime > 0) ? tsk_fs_time_to_str(tmptime, timeBuf) : "empty");

    tmptime = tsk_getu32(fs->endian, sb->s_mtime);
    tsk_fprintf(hFile, "\nLast Mounted at: %s\n",
        (tmptime > 0) ? tsk_fs_time_to_str(tmptime, timeBuf) : "empty");

    /* State of the file system */
    if (tsk_getu16(fs->endian, sb->s_state) & EXT2FS_STATE_VALID)
        tsk_fprintf(hFile, "Unmounted properly\n");
    else
        tsk_fprintf(hFile, "Unmounted Improperly\n");

    if (sb->s_last_mounted[0] != '\0')
        tsk_fprintf(hFile, "Last mounted on: %s\n", sb->s_last_mounted);

    tsk_fprintf(hFile, "\nSource OS: ");
    switch (tsk_getu32(fs->endian, sb->s_creator_os)) {
    case EXT2FS_OS_LINUX:
        tsk_fprintf(hFile, "Linux\n");
        break;
    case EXT2FS_OS_HURD:
        tsk_fprintf(hFile, "HURD\n");
        break;
    case EXT2FS_OS_MASIX:
        tsk_fprintf(hFile, "MASIX\n");
        break;
    case EXT2FS_OS_FREEBSD:
        tsk_fprintf(hFile, "FreeBSD\n");
        break;
    case EXT2FS_OS_LITES:
        tsk_fprintf(hFile, "LITES\n");
        break;
    default:
        tsk_fprintf(hFile, "%" PRIx32 "\n", tsk_getu32(fs->endian,
                sb->s_creator_os));
        break;
    }

    if (tsk_getu32(fs->endian, sb->s_rev_level) == EXT2FS_REV_ORIG)
        tsk_fprintf(hFile, "Static Structure\n");
    else
        tsk_fprintf(hFile, "Dynamic Structure\n");


    /* add features */
    if (tsk_getu32(fs->endian, sb->s_feature_compat)) {
        tsk_fprintf(hFile, "Compat Features: ");

        if (tsk_getu32(fs->endian, sb->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_DIR_PREALLOC)
            tsk_fprintf(hFile, "Dir Prealloc, ");
        if (tsk_getu32(fs->endian, sb->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_IMAGIC_INODES)
            tsk_fprintf(hFile, "iMagic inodes, ");
        if (tsk_getu32(fs->endian, sb->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_HAS_JOURNAL)
            tsk_fprintf(hFile, "Journal, ");
        if (tsk_getu32(fs->endian, sb->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_EXT_ATTR)
            tsk_fprintf(hFile, "Ext Attributes, ");
        if (tsk_getu32(fs->endian, sb->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_RESIZE_INO)
            tsk_fprintf(hFile, "Resize Inode, ");
        if (tsk_getu32(fs->endian, sb->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_DIR_INDEX)
            tsk_fprintf(hFile, "Dir Index");

        tsk_fprintf(hFile, "\n");
    }

    if (tsk_getu32(fs->endian, sb->s_feature_incompat)) {
        tsk_fprintf(hFile, "InCompat Features: ");

        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_COMPRESSION)
            tsk_fprintf(hFile, "Compression, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_FILETYPE)
            tsk_fprintf(hFile, "Filetype, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_RECOVER)
            tsk_fprintf(hFile, "Needs Recovery, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_JOURNAL_DEV)
            tsk_fprintf(hFile, "Journal Dev");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_META_BG)
            tsk_fprintf(hFile, "Meta Block Groups, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_EXTENTS)
            tsk_fprintf(hFile, "Extents, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_64BIT)
            tsk_fprintf(hFile, "64bit, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_MMP)
            tsk_fprintf(hFile, "Multiple Mount Protection, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_FLEX_BG)
            tsk_fprintf(hFile, "Flexible Block Groups, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_EA_INODE)
            tsk_fprintf(hFile, "Extended Attributes, ");
        if (tsk_getu32(fs->endian, sb->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_DIRDATA)
            tsk_fprintf(hFile, "Directory Entry Data");

        tsk_fprintf(hFile, "\n");
    }

    if (tsk_getu32(fs->endian, sb->s_feature_ro_compat)) {
        tsk_fprintf(hFile, "Read Only Compat Features: ");

        if (tsk_getu32(fs->endian, sb->s_feature_ro_compat) &
            EXT2FS_FEATURE_RO_COMPAT_SPARSE_SUPER)
            tsk_fprintf(hFile, "Sparse Super, ");
        if (tsk_getu32(fs->endian, sb->s_feature_ro_compat) &
            EXT2FS_FEATURE_RO_COMPAT_LARGE_FILE)
            tsk_fprintf(hFile, "Large File, ");
        if (EXT2FS_HAS_RO_COMPAT_FEATURE(fs, sb,
                EXT2FS_FEATURE_RO_COMPAT_HUGE_FILE))
            tsk_fprintf(hFile, "Huge File, ");
        if (tsk_getu32(fs->endian, sb->s_feature_ro_compat) &
            EXT2FS_FEATURE_RO_COMPAT_BTREE_DIR)
            tsk_fprintf(hFile, "Btree Dir, ");
        if (tsk_getu32(fs->endian, sb->s_feature_ro_compat) &
            EXT2FS_FEATURE_RO_COMPAT_EXTRA_ISIZE)
            tsk_fprintf(hFile, "Extra Inode Size");

        tsk_fprintf(hFile, "\n");
    }

    /* Print journal information */
    if (tsk_getu32(fs->endian, sb->s_feature_compat) &
        EXT2FS_FEATURE_COMPAT_HAS_JOURNAL) {

        tsk_fprintf(hFile, "\nJournal ID: %" PRIx64 "%" PRIx64 "\n",
            tsk_getu64(fs->endian, &sb->s_journal_uuid[8]),
            tsk_getu64(fs->endian, &sb->s_journal_uuid[0]));

        if (tsk_getu32(fs->endian, sb->s_journal_inum) != 0)
            tsk_fprintf(hFile, "Journal Inode: %" PRIu32 "\n",
                tsk_getu32(fs->endian, sb->s_journal_inum));

        if (tsk_getu32(fs->endian, sb->s_journal_dev) != 0)
            tsk_fprintf(hFile, "Journal Device: %" PRIu32 "\n",
                tsk_getu32(fs->endian, sb->s_journal_dev));


    }

    tsk_fprintf(hFile, "\nMETADATA INFORMATION\n");
    tsk_fprintf(hFile, "--------------------------------------------\n");

    tsk_fprintf(hFile, "Inode Range: %" PRIuINUM " - %" PRIuINUM "\n",
        fs->first_inum, fs->last_inum);
    tsk_fprintf(hFile, "Root Directory: %" PRIuINUM "\n", fs->root_inum);

    tsk_fprintf(hFile, "Free Inodes: %" PRIu32 "\n",
        tsk_getu32(fs->endian, sb->s_free_inode_count));
    /*
       Only print size of inode for Ext4
       This determines if you will get nanosecs and crtime
     */
    if (!strcmp(tmptypename, "Ext4")) {
        tsk_fprintf(hFile, "Inode Size: %" PRIu16 "\n",
            tsk_getu16(fs->endian, sb->s_inode_size));
    }


    if (tsk_getu32(fs->endian, sb->s_last_orphan)) {
        uint32_t or_in;
        tsk_fprintf(hFile, "Orphan Inodes: ");
        or_in = tsk_getu32(fs->endian, sb->s_last_orphan);

        while (or_in) {
            TSK_FS_FILE *fs_file;

            if ((or_in > fs->last_inum) || (or_in < fs->first_inum))
                break;

            tsk_fprintf(hFile, "%" PRIu32 ", ", or_in);

            if ((fs_file = tsk_fs_file_alloc(fs)) == NULL) {
                /* Ignore this error */
                tsk_error_reset();
                break;
            }

            /* Get the next one */
            if (ext2fs_inode_lookup(fs, fs_file, or_in)) {
                /* Ignore this error */
                tsk_error_reset();
                break;
            }

            or_in = (uint32_t) fs_file->meta->time2.ext2.dtime;
            tsk_fs_file_close(fs_file);
        }
        tsk_fprintf(hFile, "\n");
    }

    tsk_fprintf(hFile, "\nCONTENT INFORMATION\n");
    tsk_fprintf(hFile, "--------------------------------------------\n");

    if (fs->ftype == TSK_FS_TYPE_EXT4) {
        tsk_fprintf(hFile, "Block Groups Per Flex Group: %" PRIu32 "\n",
            (1 << sb->s_log_groups_per_flex));
//        gpfbg = (1 << sb->s_log_groups_per_flex);
    }

    tsk_fprintf(hFile, "Block Range: %" PRIuDADDR " - %" PRIuDADDR "\n",
        fs->first_block, fs->last_block);

    if (fs->last_block != fs->last_block_act)
        tsk_fprintf(hFile,
            "Total Range in Image: %" PRIuDADDR " - %" PRIuDADDR "\n",
            fs->first_block, fs->last_block_act);

    tsk_fprintf(hFile, "Block Size: %u\n", fs->block_size);

    if (tsk_getu32(fs->endian, sb->s_first_data_block))
        tsk_fprintf(hFile,
            "Reserved Blocks Before Block Groups: %" PRIu32 "\n",
            tsk_getu32(fs->endian, sb->s_first_data_block));

    tsk_fprintf(hFile, "Free Blocks: %" PRIu32 "\n",
        tsk_getu32(fs->endian, sb->s_free_blocks_count));

    tsk_fprintf(hFile, "\nBLOCK GROUP INFORMATION\n");
    tsk_fprintf(hFile, "--------------------------------------------\n");

    tsk_fprintf(hFile, "Number of Block Groups: %" PRI_EXT2GRP "\n",
        ext2fs->groups_count);

    tsk_fprintf(hFile, "Inodes per group: %" PRIu32 "\n",
        tsk_getu32(fs->endian, sb->s_inodes_per_group));
    tsk_fprintf(hFile, "Blocks per group: %" PRIu32 "\n",
        tsk_getu32(fs->endian, sb->s_blocks_per_group));


    /* number of blocks the inodes consume */
    ibpg =
        (tsk_getu32(fs->endian,
            sb->s_inodes_per_group) * ext2fs->inode_size + fs->block_size -
        1) / fs->block_size;
    /* number of blocks group descriptors consume */
//    gd_blocks =
//        (unsigned int)((gd_size * ext2fs->groups_count + fs->block_size -
//        1) / fs->block_size);

#ifdef Ext4_DBG
    tsk_fprintf(hFile, "\n\tDEBUG: Group Descriptor Size: %d\n", gd_size);      //DEBUG
    tsk_fprintf(hFile, "\n\tDEBUG: Group Descriptor Size: %d\n", *sb->s_desc_size);     //DEBUG
    debug_print_buf((unsigned char *) &sb->pad_or_gdt, 16);
    printf("\n\tDEBUG: gdt_growth: %d\n", tsk_getu16(fs->endian,
        sb->pad_or_gdt.s_reserved_gdt_blocks));
#endif

    for (i = 0; i < ext2fs->groups_count; i++) {
        TSK_DADDR_T cg_base;
        TSK_INUM_T inum;

        /* lock access to grp_buf */
        tsk_take_lock(&ext2fs->lock);

        if (ext2fs_group_load(ext2fs, i)) {
            tsk_release_lock(&ext2fs->lock);
            return 1;
        }
        tsk_fprintf(hFile, "\nGroup: %d:\n", i);
        if (ext2fs->ext4_grp_buf != NULL) {
            tsk_fprintf(hFile, "  Block Group Flags: [");
            if (EXT4BG_HAS_FLAG(fs, ext2fs->ext4_grp_buf,
                EXT4_BG_INODE_UNINIT))
                tsk_fprintf(hFile, "INODE_UNINIT, ");
            if (EXT4BG_HAS_FLAG(fs, ext2fs->ext4_grp_buf,
                EXT4_BG_BLOCK_UNINIT))
                tsk_fprintf(hFile, "BLOCK_UNINIT, ");
            if (EXT4BG_HAS_FLAG(fs, ext2fs->ext4_grp_buf,
                EXT4_BG_INODE_ZEROED))
                tsk_fprintf(hFile, "INODE_ZEROED, ");
            tsk_fprintf(hFile, "\b\b]\n");
        }
        inum =
            fs->first_inum + tsk_gets32(fs->endian,
            sb->s_inodes_per_group) * i;
        tsk_fprintf(hFile, "  Inode Range: %" PRIuINUM " - ", inum);

        if ((inum + tsk_gets32(fs->endian, sb->s_inodes_per_group) - 1) <
            fs->last_inum)
            tsk_fprintf(hFile, "%" PRIuINUM "\n",
            inum + tsk_gets32(fs->endian, sb->s_inodes_per_group) - 1);
        else
            tsk_fprintf(hFile, "%" PRIuINUM "\n", fs->last_inum);

        if (tsk_getu32(fs->endian,
            ext2fs->fs->
            s_feature_incompat) & EXT2FS_FEATURE_INCOMPAT_64BIT) {
                cg_base = ext4_cgbase_lcl(fs, sb, i);
#ifdef Ext4_DBG
                printf("DEBUG64: ext2_cgbase_lcl %" PRIuDADDR "\n", cg_base);
                printf("DEBUG64: fs->s_first_data_block %" PRIuDADDR "\n",
                    tsk_getu32(fs->endian, sb->s_first_data_block));
                printf("DEBUG64: blocks_per_group %" PRIuDADDR "\n",
                    tsk_getu32(fs->endian, sb->s_blocks_per_group));
                printf("DEBUG64: i %" PRIuDADDR " %" PRIuDADDR " %" PRIuDADDR
                    "\n", i, tsk_getu32(fs->endian, sb->s_blocks_per_group),
                    (uint64_t) i * (uint64_t) tsk_getu32(fs->endian,
                    sb->s_blocks_per_group));
                //printf("DEBUG: calculated %"PRIuDADDR"\n", )
#endif
                tsk_fprintf(hFile,
                    "  Block Range: %" PRIuDADDR " - %" PRIuDADDR "\n",
                    cg_base, ((ext4_cgbase_lcl(fs, sb,
                    i + 1) - 1) <
                    fs->last_block) ? (ext4_cgbase_lcl(fs, sb,
                    i + 1) - 1) : fs->last_block);
        }
        else {
            cg_base = ext2_cgbase_lcl(fs, sb, i);
#ifdef Ext4_DBG
            debug_print_buf(sb, 100);
            printf("DEBUG32: ext2_cgbase_lcl %" PRIuDADDR "\n", cg_base);
            printf("DEBUG32: fs->s_first_data_block %" PRIu32 "\n",
                tsk_getu32(fs->endian, sb->s_first_data_block));
            printf("DEBUG32: blocks_per_group %" PRIu32 "\n",
                tsk_getu32(fs->endian, sb->s_blocks_per_group));
            printf("DEBUG32: i: %" PRIu32 " blocks per group: %" PRIu32
                " i*blocks_per_group: %" PRIu32 "\n",
                i, tsk_getu32(fs->endian, sb->s_blocks_per_group),
                (uint64_t) i * (uint64_t) tsk_getu32(fs->endian,
                sb->s_blocks_per_group));
            //printf("DEBUG: calculated %"PRIuDADDR"\n", )
#endif
            tsk_fprintf(hFile,
                "  Block Range: %" PRIuDADDR " - %" PRIuDADDR "\n",
                cg_base, ((ext2_cgbase_lcl(fs, sb,
                i + 1) - 1) <
                fs->last_block) ? (ext2_cgbase_lcl(fs, sb,
                i + 1) - 1) : fs->last_block);
        }



        tsk_fprintf(hFile, "  Layout:\n");

        /* only print the super block data if we are not in a sparse
        * group
        */
#ifdef Ext4_DBG
        printf("DEBUG: ext2fs_super: %d\n",
            ext2fs_is_super_bg(tsk_getu32(fs->endian,
            sb->s_feature_ro_compat), i));
#endif
        /*        if (((tsk_getu32(fs->endian, ext2fs->fs->s_feature_ro_compat) &
        EXT2FS_FEATURE_RO_COMPAT_SPARSE_SUPER) &&
        (cg_base != tsk_getu32(fs->endian,
        ext2fs->grp_buf->bg_block_bitmap)))
        || ((tsk_getu32(fs->endian,
        ext2fs->fs->s_feature_ro_compat) &
        EXT2FS_FEATURE_RO_COMPAT_SPARSE_SUPER) == 0)) {
        */
        if (ext2fs_is_super_bg(tsk_getu32(fs->endian,
            sb->s_feature_ro_compat), i)) {
                TSK_OFF_T boff;

                /* the super block is the first 1024 bytes */
                tsk_fprintf(hFile,
                    "    Super Block: %" PRIuDADDR " - %" PRIuDADDR "\n",
                    cg_base,
                    cg_base +
                    ((sizeof(ext2fs_sb) + fs->block_size -
                    1) / fs->block_size) - 1);

                boff = roundup(sizeof(ext2fs_sb), fs->block_size);

                /* Group Descriptors */
                tsk_fprintf(hFile,
                    "    Group Descriptor Table: %" PRIuDADDR " - ",
                    (cg_base + (boff + fs->block_size - 1) / fs->block_size));

                //            printf("DEBUG: Groups Count: %u * gd_size: %u = %u\n", ext2fs->groups_count, gd_size, ext2fs->groups_count * gd_size);
                boff += (ext2fs->groups_count * gd_size);
                tsk_fprintf(hFile, "%" PRIuDADDR "\n",
                    ((cg_base +
                    (boff + fs->block_size - 1) / fs->block_size) -
                    1));
                if (fs->ftype == TSK_FS_TYPE_EXT4) {
                    tsk_fprintf(hFile,
                        "    Group Descriptor Growth Blocks: %" PRIuDADDR
                        " - ",
                        cg_base + (boff + fs->block_size -
                        1) / fs->block_size);
                    boff +=
                        tsk_getu16(fs->endian,
                        ext2fs->fs->pad_or_gdt.s_reserved_gdt_blocks) *
                        fs->block_size;
                    tsk_fprintf(hFile, "%" PRIuDADDR "\n",
                        ((cg_base + (boff + fs->block_size -
                        1) / fs->block_size) - 1));
                }
        }


        if (ext2fs->ext4_grp_buf != NULL) {
            /* The block bitmap is a full block */
            tsk_fprintf(hFile,
                "    Data bitmap: %" PRIu64 " - %" PRIu64 "\n",
                ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_block_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_block_bitmap_lo),
                ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_block_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_block_bitmap_lo));


            /* The inode bitmap is a full block */
            tsk_fprintf(hFile,
                "    Inode bitmap: %" PRIu64 " - %" PRIu64 "\n",
                ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_lo),
                ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_hi,
                ext2fs->ext4_grp_buf->bg_inode_bitmap_lo));


            tsk_fprintf(hFile,
                "    Inode Table: %" PRIu64 " - %" PRIu64 "\n",
                ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_inode_table_hi,
                ext2fs->ext4_grp_buf->bg_inode_table_lo),
                ext4_getu64(fs->endian,
                ext2fs->ext4_grp_buf->bg_inode_table_hi,
                ext2fs->ext4_grp_buf->bg_inode_table_lo)
                + ibpg - 1);

            ext4_fsstat_datablock_helper(fs, hFile, i, cg_base, gd_size);
        }
        else {
            /* The block bitmap is a full block */
            tsk_fprintf(hFile,
                "    Data bitmap: %" PRIu32 " - %" PRIu32 "\n",
                tsk_getu32(fs->endian, ext2fs->grp_buf->bg_block_bitmap),
                tsk_getu32(fs->endian, ext2fs->grp_buf->bg_block_bitmap));


            /* The inode bitmap is a full block */
            tsk_fprintf(hFile,
                "    Inode bitmap: %" PRIu32 " - %" PRIu32 "\n",
                tsk_getu32(fs->endian, ext2fs->grp_buf->bg_inode_bitmap),
                tsk_getu32(fs->endian, ext2fs->grp_buf->bg_inode_bitmap));


            tsk_fprintf(hFile,
                "    Inode Table: %" PRIu32 " - %" PRIu32 "\n",
                tsk_getu32(fs->endian, ext2fs->grp_buf->bg_inode_table),
                tsk_getu32(fs->endian,
                ext2fs->grp_buf->bg_inode_table) + ibpg - 1);
        
            tsk_fprintf(hFile, "    Data Blocks: ");
            // BC: Commented out from Ext4 commit because it produced
            // bad data on Ext2 test image.
            //if (ext2fs_is_super_bg(tsk_getu32(fs->endian,
            //            sb->s_feature_ro_compat), i)) {
            if ((tsk_getu32(fs->endian, ext2fs->fs->s_feature_ro_compat) &
                EXT2FS_FEATURE_RO_COMPAT_SPARSE_SUPER) &&
                (cg_base == tsk_getu32(fs->endian,
                ext2fs->grp_buf->bg_block_bitmap))) {

                    /* it goes from the end of the inode bitmap to before the
                    * table
                    *
                    * This hard coded aspect does not scale ...
                    */

                    tsk_fprintf(hFile, "%" PRIu32 " - %" PRIu32 ", ",
                        tsk_getu32(fs->endian,
                        ext2fs->grp_buf->bg_inode_bitmap) + 1,
                        tsk_getu32(fs->endian,
                        ext2fs->grp_buf->bg_inode_table) - 1);
            }

            tsk_fprintf(hFile, "%" PRIu32 " - %" PRIu32 "\n",
                (uint64_t) tsk_getu32(fs->endian,
                ext2fs->grp_buf->bg_inode_table) + ibpg,
                ((ext2_cgbase_lcl(fs, sb, i + 1) - 1) <
                fs->last_block) ? (ext2_cgbase_lcl(fs, sb,
                i + 1) - 1) : fs->last_block);
        }

        /* Print the free info */

        /* The last group may not have a full number of blocks */
        if (i != (ext2fs->groups_count - 1)) {
            uint64_t tmpInt;

            if (ext2fs->ext4_grp_buf != NULL) 
                // @@@ Should be 32-bit
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->ext4_grp_buf->bg_free_inodes_count_lo);
            else
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->grp_buf->bg_free_inodes_count);
            
            tsk_fprintf(hFile,
                "  Free Inodes: %" PRIu32 " (%" PRIu32 "%%)\n",
                tmpInt, (100 * tmpInt) /  
                tsk_getu32(fs->endian, sb->s_inodes_per_group));


            if (ext2fs->ext4_grp_buf != NULL) 
                // @@@ Should be 32-bit
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->ext4_grp_buf->bg_free_blocks_count_lo);
            else
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->grp_buf->bg_free_blocks_count);

            tsk_fprintf(hFile,
                "  Free Blocks: %" PRIu32 " (%" PRIu32 "%%)\n",
                tmpInt,
                (100 * tmpInt) / 
                tsk_getu32(fs->endian, sb->s_blocks_per_group));
        }
        else {
            TSK_INUM_T inum_left;
            TSK_DADDR_T blk_left;
            uint64_t tmpInt;

            inum_left =
                (fs->last_inum % tsk_gets32(fs->endian,
                sb->s_inodes_per_group)) - 1;

            if (inum_left == 0)
                inum_left = tsk_getu32(fs->endian, sb->s_inodes_per_group);

            if (ext2fs->ext4_grp_buf != NULL) 
                // @@@ Should be 32-bit
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->ext4_grp_buf->bg_free_inodes_count_lo);
            else
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->grp_buf->bg_free_inodes_count);
            
            tsk_fprintf(hFile, "  Free Inodes: %" PRIu32 " (%d%%)\n",
                tmpInt, 100 * tmpInt / inum_left); 

            /* Now blocks */
            blk_left =
                fs->block_count % tsk_getu32(fs->endian,
                sb->s_blocks_per_group);
            if (blk_left == 0)
                blk_left = tsk_getu32(fs->endian, sb->s_blocks_per_group);

            if (ext2fs->ext4_grp_buf != NULL) 
                // @@@ Should be 32-bit
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->ext4_grp_buf->bg_free_blocks_count_lo);
            else
                tmpInt = tsk_getu16(fs->endian,
                    ext2fs->grp_buf->bg_free_blocks_count);

            tsk_fprintf(hFile, "  Free Blocks: %" PRIu32 " (%d%%)\n",
                tmpInt, 100 * tmpInt / blk_left);
        }


        if (ext2fs->ext4_grp_buf != NULL) {
            // @@@@ Sould be 32-bit
            tsk_fprintf(hFile, "  Total Directories: %" PRIu16 "\n",
                tsk_getu16(fs->endian, ext2fs->ext4_grp_buf->bg_used_dirs_count_lo));

            tsk_fprintf(hFile, "  Stored Checksum: 0x%04" PRIX16 "\n",
                tsk_getu16(fs->endian, ext2fs->ext4_grp_buf->bg_checksum));
#ifdef EXT4_CHECKSUMS
            //Need Non-GPL CRC16
            tsk_fprintf(hFile, "  Calculated Checksum: 0x%04" PRIX16 "\n",
                ext4_group_desc_csum(ext2fs->fs, i, ext2fs->ext4_grp_buf));
#endif
        }
        else {
            tsk_fprintf(hFile, "  Total Directories: %" PRIu16 "\n",
               tsk_getu16(fs->endian, ext2fs->grp_buf->bg_used_dirs_count));
        }

        tsk_release_lock(&ext2fs->lock);
    }

    return 0;
}


/************************* istat *******************************/

static void
ext2fs_make_acl_str(char *str, int len, uint16_t perm)
{
    int i = 0;

    if (perm & EXT2_PACL_PERM_READ) {
        snprintf(&str[i], len - 1, "Read");
        i += 4;
    }
    if (perm & EXT2_PACL_PERM_WRITE) {
        if (i) {
            snprintf(&str[i], len - i - 1, ", ");
            i += 2;
        }
        snprintf(&str[i], len - i - 1, "Write");
        i += 5;
    }
    if (perm & EXT2_PACL_PERM_EXEC) {
        if (i) {
            snprintf(&str[i], len - i - 1, ", ");
            i += 2;
        }
        snprintf(&str[i], len - i - 1, "Execute");
        i += 7;
    }
}


typedef struct {
    FILE *hFile;
    int idx;
} EXT2FS_PRINT_ADDR;


/* Callback for istat to print the block addresses */
static TSK_WALK_RET_ENUM
print_addr_act(TSK_FS_FILE * fs_file, TSK_OFF_T a_off, TSK_DADDR_T addr,
    char *buf, size_t size, TSK_FS_BLOCK_FLAG_ENUM flags, void *a_ptr)
{
    TSK_FS_INFO *fs = fs_file->fs_info;
    EXT2FS_PRINT_ADDR *print = (EXT2FS_PRINT_ADDR *) a_ptr;

    if (flags & TSK_FS_BLOCK_FLAG_CONT) {
        int i, s;
        /* cycle through the blocks if they exist */
        for (i = 0, s = (int) size; s > 0; s -= fs->block_size, i++) {

            /* sparse file */
            if (addr)
                tsk_fprintf(print->hFile, "%" PRIuDADDR " ", addr + i);
            else
                tsk_fprintf(print->hFile, "0 ");

            if (++(print->idx) == 8) {
                tsk_fprintf(print->hFile, "\n");
                print->idx = 0;
            }
        }
    }

    return TSK_WALK_CONT;
}


/**
 * Print details on a specific file to a file handle.
 *
 * @param fs File system file is located in
 * @param hFile File handle to print text to
 * @param inum Address of file in file system
 * @param numblock The number of blocks in file to force print (can go beyond file size)
 * @param sec_skew Clock skew in seconds to also print times in
 *
 * @returns 1 on error and 0 on success
 */
static uint8_t
ext2fs_istat(TSK_FS_INFO * fs, TSK_FS_ISTAT_FLAG_ENUM istat_flags, FILE * hFile, TSK_INUM_T inum,
    TSK_DADDR_T numblock, int32_t sec_skew)
{
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) fs;
    TSK_FS_META *fs_meta;
    TSK_FS_FILE *fs_file;
    char ls[12];
    EXT2FS_PRINT_ADDR print;
    const TSK_FS_ATTR *fs_attr_indir;
    ext2fs_inode *dino_buf = NULL;
    uint8_t *ea_buf = NULL;
    size_t ea_buf_len = 0;
    char timeBuf[128];
    unsigned int size;
    unsigned int large_inodes;

    // clean up any error messages that are lying around
    tsk_error_reset();
    if (ext2fs->inode_size > 128) {
        large_inodes = 1;
    }
    else {
        large_inodes = 0;
    }

    size =
        ext2fs->inode_size >
        sizeof(ext2fs_inode) ? ext2fs->inode_size : sizeof(ext2fs_inode);
    if ((dino_buf = (ext2fs_inode *) tsk_malloc(size)) == NULL) {
        return 1;
    }

    if (ext2fs_dinode_load(ext2fs, inum, dino_buf, &ea_buf, &ea_buf_len)) {
        free(dino_buf);
        return 1;
    }

    if ((fs_file = tsk_fs_file_open_meta(fs, NULL, inum)) == NULL) {
        free(dino_buf);
        return 1;
    }
    fs_meta = fs_file->meta;

    tsk_fprintf(hFile, "inode: %" PRIuINUM "\n", inum);
    tsk_fprintf(hFile, "%sAllocated\n",
        (fs_meta->flags & TSK_FS_META_FLAG_ALLOC) ? "" : "Not ");

    tsk_fprintf(hFile, "Group: %" PRIuGID "\n", ext2fs->grp_num);

    // Note that if this is a "virtual file", then ext2fs->dino_buf may not be set.
    tsk_fprintf(hFile, "Generation Id: %" PRIu32 "\n",
        tsk_getu32(fs->endian, dino_buf->i_generation));

    if (fs_meta->link)
        tsk_fprintf(hFile, "symbolic link to: %s\n", fs_meta->link);

    tsk_fprintf(hFile, "uid / gid: %" PRIuUID " / %" PRIuGID "\n",
        fs_meta->uid, fs_meta->gid);

    tsk_fs_meta_make_ls(fs_meta, ls, sizeof(ls));
    tsk_fprintf(hFile, "mode: %s\n", ls);

    /* Print the device ids */
    if ((fs_meta->type == TSK_FS_META_TYPE_BLK)
        || (fs_meta->type == TSK_FS_META_TYPE_CHR)) {
        tsk_fprintf(hFile,
            "Device Major: %" PRIu8 "   Minor: %" PRIu8 "\n",
            dino_buf->i_block[0][1], dino_buf->i_block[0][0]);
    }

    if (tsk_getu32(fs->endian, dino_buf->i_flags)) {
        tsk_fprintf(hFile, "Flags: ");
        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_SECDEL)
            tsk_fprintf(hFile, "Secure Delete, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_UNRM)
            tsk_fprintf(hFile, "Undelete, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_COMP)
            tsk_fprintf(hFile, "Compressed, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_SYNC)
            tsk_fprintf(hFile, "Sync Updates, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_IMM)
            tsk_fprintf(hFile, "Immutable, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_APPEND)
            tsk_fprintf(hFile, "Append Only, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_NODUMP)
            tsk_fprintf(hFile, "Do Not Dump, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_NOA)
            tsk_fprintf(hFile, "No A-Time, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_DIRTY)
            tsk_fprintf(hFile, "Dirty Compressed File, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_COMPRBLK)
            tsk_fprintf(hFile, "Compressed Clusters, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_NOCOMPR)
            tsk_fprintf(hFile, "Do Not Compress, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_ECOMPR)
            tsk_fprintf(hFile, "Compression Error, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_INDEX)
            tsk_fprintf(hFile, "Hash Indexed Directory, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_IMAGIC)
            tsk_fprintf(hFile, "AFS Magic Directory, ");

        if (tsk_getu32(fs->endian,
                dino_buf->i_flags) & EXT2_IN_JOURNAL_DATA)
            tsk_fprintf(hFile, "Journal Data, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_NOTAIL)
            tsk_fprintf(hFile, "Do Not Merge Tail, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_DIRSYNC)
            tsk_fprintf(hFile, "Directory  Sync, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_TOPDIR)
            tsk_fprintf(hFile, "Top Directory, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_HUGE_FILE)
            tsk_fprintf(hFile, "Huge File, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_EXTENTS)
            tsk_fprintf(hFile, "Extents, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_EA_INODE)
            tsk_fprintf(hFile, "Large Extended Attribute, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_IN_EOFBLOCKS)
            tsk_fprintf(hFile, "Blocks Allocated Beyond EOF, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_SNAPFILE)
            tsk_fprintf(hFile, "Snapshot, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_SNAPFILE_DELETED)
            tsk_fprintf(hFile, "Deleted Snapshot, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_SNAPFILE_SHRUNK)
            tsk_fprintf(hFile, "Shrunk Snapshot, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_INLINE_DATA)
            tsk_fprintf(hFile, "Inline Data, ");

        if (tsk_getu32(fs->endian, dino_buf->i_flags) & EXT2_PROJINHERIT)
            tsk_fprintf(hFile, "Inherited project ID, ");


        tsk_fprintf(hFile, "\n");
    }

    tsk_fprintf(hFile, "size: %" PRIdOFF "\n", fs_meta->size);
    tsk_fprintf(hFile, "num of links: %d\n", fs_meta->nlink);

    /* Ext attribute are stored in a block with a header and a list
     * of entries that are aligned to 4-byte boundaries.  The attr
     * value is stored at the end of the block.  There are 4 null bytes
     * in between the headers and values
     */
    if (tsk_getu32(fs->endian, dino_buf->i_file_acl) != 0) {
        char *buf;
        ext2fs_ea_header *ea_head;
        ext2fs_ea_entry *ea_entry;
        ssize_t cnt;

        if ((buf = tsk_malloc(fs->block_size)) == NULL) {
            tsk_fs_file_close(fs_file);
            free(dino_buf);
            return 1;
        }

        tsk_fprintf(hFile,
            "\nExtended Attributes  (Block: %" PRIu32 ")\n",
            tsk_getu32(fs->endian, dino_buf->i_file_acl));

        /* Is the value too big? */
        if (tsk_getu32(fs->endian, dino_buf->i_file_acl) > fs->last_block) {
            tsk_fprintf(hFile,
                "Extended Attributes block is larger than file system\n");
            goto egress_ea;
        }

        cnt = tsk_fs_read(fs,
            (TSK_DADDR_T) tsk_getu32(fs->endian,
                dino_buf->i_file_acl) * fs->block_size,
            buf, fs->block_size);

        if (cnt != fs->block_size) {
            if (cnt >= 0) {
                tsk_error_reset();
                tsk_error_set_errno(TSK_ERR_FS_READ);
            }
            tsk_error_set_errstr2("ext2fs_istat: ACL block %" PRIu32,
                tsk_getu32(fs->endian, dino_buf->i_file_acl));
            tsk_fs_file_close(fs_file);
            free(buf);
            free(dino_buf);
            return 1;
        }


        /* Check the header */
        ea_head = (ext2fs_ea_header *) buf;
        if (tsk_getu32(fs->endian, ea_head->magic) != EXT2_EA_MAGIC) {
            tsk_fprintf(hFile,
                "Incorrect extended attribute header: %" PRIx32 "\n",
                tsk_getu32(fs->endian, ea_head->magic));
        }


        /* Cycle through each entry - at the top of the block */
        for (ea_entry = (ext2fs_ea_entry *) & ea_head->entry;
            ((uintptr_t) ea_entry <
                ((uintptr_t) buf + fs->block_size -
                    sizeof(ext2fs_ea_entry)));
            ea_entry =
            (ext2fs_ea_entry *) ((uintptr_t) ea_entry +
                EXT2_EA_LEN(ea_entry->nlen))) {

            char name[256];

            /* Stop if the first four bytes are NULL */
            if ((ea_entry->nlen == 0) && (ea_entry->nidx == 0) &&
                (tsk_getu16(fs->endian, ea_entry->val_off) == 0))
                break;

            /* The Linux src does not allow this */
            if (tsk_getu32(fs->endian, ea_entry->val_blk) != 0) {
                tsk_fprintf(hFile,
                    "Attribute has non-zero value block - skipping\n");
                continue;
            }


            /* Is the value location and size valid? */
            //if ((tsk_getu32(fs->endian,
            if ((tsk_getu16(fs->endian,
                        ea_entry->val_off) > fs->block_size)
                || ((tsk_getu16(fs->endian,
                            ea_entry->val_off) + tsk_getu32(fs->endian,
                            ea_entry->val_size)) > fs->block_size)) {
                continue;
            }


            /* Copy the name into a buffer - not NULL term */
            strncpy(name, (char *) &ea_entry->name, ea_entry->nlen);
            name[ea_entry->nlen] = '\0';


            /* User assigned attributes - setfattr / getfattr */
            if ((ea_entry->nidx == EXT2_EA_IDX_USER) ||
                (ea_entry->nidx == EXT2_EA_IDX_TRUSTED) ||
                (ea_entry->nidx == EXT2_EA_IDX_SECURITY)) {
                char val[256];

                strncpy(val,
                    &buf[tsk_getu16(fs->endian, ea_entry->val_off)],
                    tsk_getu32(fs->endian,
                        ea_entry->val_size) >
                    256 ? 256 : tsk_getu32(fs->endian,
                        ea_entry->val_size));

                val[tsk_getu32(fs->endian, ea_entry->val_size) > 255 ?
                    255 : tsk_getu32(fs->endian, ea_entry->val_size)] =
                    '\0';

                if (ea_entry->nidx == EXT2_EA_IDX_USER)
                    tsk_fprintf(hFile, "user.%s=%s\n", name, val);
                else if (ea_entry->nidx == EXT2_EA_IDX_TRUSTED)
                    tsk_fprintf(hFile, "trust.%s=%s\n", name, val);
                else if (ea_entry->nidx == EXT2_EA_IDX_SECURITY)
                    tsk_fprintf(hFile, "security.%s=%s\n", name, val);

            }


            /* POSIX ACL - setfacl / getfacl stuff */
            else if ((ea_entry->nidx == EXT2_EA_IDX_POSIX_ACL_ACCESS)
                || (ea_entry->nidx == EXT2_EA_IDX_POSIX_ACL_DEFAULT)) {

                ext2fs_pos_acl_entry_lo *acl_lo;
                ext2fs_pos_acl_head *acl_head;

                if (ea_entry->nidx == EXT2_EA_IDX_POSIX_ACL_ACCESS)
                    tsk_fprintf(hFile,
                        "POSIX Access Control List Entries:\n");
                else if (ea_entry->nidx == EXT2_EA_IDX_POSIX_ACL_DEFAULT)
                    tsk_fprintf(hFile,
                        "POSIX Default Access Control List Entries:\n");

                /* examine the header */
                acl_head =
                    (ext2fs_pos_acl_head *) &
                    buf[tsk_getu16(fs->endian, ea_entry->val_off)];

                if (tsk_getu32(fs->endian, acl_head->ver) != 1) {
                    tsk_fprintf(hFile,
                        "Invalid ACL Header Version: %" PRIu32 "\n",
                        tsk_getu32(fs->endian, acl_head->ver));
                    continue;
                }

                /* The first entry starts after the header */
                acl_lo =
                    (ext2fs_pos_acl_entry_lo *) ((uintptr_t) acl_head +
                    sizeof(ext2fs_pos_acl_head));


                /* Cycle through the values */
                while ((uintptr_t) acl_lo <
                    ((uintptr_t) buf +
                        tsk_getu16(fs->endian,
                            ea_entry->val_off) + tsk_getu32(fs->endian,
                            ea_entry->val_size))) {

                    char perm[64];
                    int len;

                    /* Make a string from the permissions */
                    ext2fs_make_acl_str(perm, 64,
                        tsk_getu16(fs->endian, acl_lo->perm));

                    switch (tsk_getu16(fs->endian, acl_lo->tag)) {
                    case EXT2_PACL_TAG_USERO:
                        tsk_fprintf(hFile, "  uid: %" PRIuUID ": %s\n",
                            fs_meta->uid, perm);
                        len = sizeof(ext2fs_pos_acl_entry_sh);
                        break;

                    case EXT2_PACL_TAG_GRPO:
                        tsk_fprintf(hFile, "  gid: %" PRIuGID ": %s\n",
                            fs_meta->gid, perm);
                        len = sizeof(ext2fs_pos_acl_entry_sh);
                        break;
                    case EXT2_PACL_TAG_OTHER:
                        tsk_fprintf(hFile, "  other: %s\n", perm);
                        len = sizeof(ext2fs_pos_acl_entry_sh);
                        break;
                    case EXT2_PACL_TAG_MASK:
                        tsk_fprintf(hFile, "  mask: %s\n", perm);
                        len = sizeof(ext2fs_pos_acl_entry_sh);
                        break;


                    case EXT2_PACL_TAG_GRP:
                        tsk_fprintf(hFile, "  gid: %" PRIu32 ": %s\n",
                            tsk_getu32(fs->endian, acl_lo->id), perm);
                        len = sizeof(ext2fs_pos_acl_entry_lo);
                        break;

                    case EXT2_PACL_TAG_USER:
                        tsk_fprintf(hFile, "  uid: %" PRIu32 ": %s\n",
                            tsk_getu32(fs->endian, acl_lo->id), perm);

                        len = sizeof(ext2fs_pos_acl_entry_lo);
                        break;

                    default:
                        tsk_fprintf(hFile, "Unknown ACL tag: %d\n",
                            tsk_getu16(fs->endian, acl_lo->tag));
                        len = sizeof(ext2fs_pos_acl_entry_sh);
                        break;
                    }
                    acl_lo =
                        (ext2fs_pos_acl_entry_lo *) ((uintptr_t) acl_lo
                        + len);
                }
            }
            else {
                tsk_fprintf(hFile,
                    "Unsupported Extended Attr Type: %d\n",
                    ea_entry->nidx);
            }
        }
      egress_ea:

        free(buf);
    }

    if (sec_skew != 0) {
        tsk_fprintf(hFile, "\nAdjusted Inode Times:\n");
        if (fs_meta->mtime)
            fs_meta->mtime -= sec_skew;
        if (fs_meta->atime)
            fs_meta->atime -= sec_skew;
        if (fs_meta->ctime)
            fs_meta->ctime -= sec_skew;


        if (fs->ftype == TSK_FS_TYPE_EXT4 && large_inodes) {
            tsk_fprintf(hFile, "Accessed:\t%s\n",
                tsk_fs_time_to_str_subsecs(fs_meta->atime,
                    fs_meta->atime_nano, timeBuf));
            tsk_fprintf(hFile, "File Modified:\t%s\n",
                tsk_fs_time_to_str_subsecs(fs_meta->mtime,
                    fs_meta->mtime_nano, timeBuf));
            tsk_fprintf(hFile, "Inode Modified:\t%s\n",
                tsk_fs_time_to_str_subsecs(fs_meta->ctime,
                    fs_meta->ctime_nano, timeBuf));
        }
        else {
            tsk_fprintf(hFile, "Accessed:\t%s\n",
                tsk_fs_time_to_str(fs_meta->atime, timeBuf));
            tsk_fprintf(hFile, "File Modified:\t%s\n",
                tsk_fs_time_to_str(fs_meta->mtime, timeBuf));
            tsk_fprintf(hFile, "Inode Modified:\t%s\n",
                tsk_fs_time_to_str(fs_meta->ctime, timeBuf));
        }

        if (fs->ftype == TSK_FS_TYPE_EXT4 && large_inodes) {
            fs_meta->crtime -= sec_skew;
            tsk_fprintf(hFile, "File Created:\t%s\n",
                tsk_fs_time_to_str(fs_meta->crtime, timeBuf));
            fs_meta->crtime += sec_skew;

        }

        if (fs_meta->time2.ext2.dtime) {
            fs_meta->time2.ext2.dtime -= sec_skew;
            tsk_fprintf(hFile, "Deleted:\t%s",
                tsk_fs_time_to_str(fs_meta->time2.ext2.dtime, timeBuf));
            fs_meta->time2.ext2.dtime += sec_skew;
        }

        if (fs_meta->mtime)
            fs_meta->mtime += sec_skew;
        if (fs_meta->atime)
            fs_meta->atime += sec_skew;
        if (fs_meta->ctime)
            fs_meta->ctime += sec_skew;

        tsk_fprintf(hFile, "\nOriginal Inode Times:\n");
    }
    else {
        tsk_fprintf(hFile, "\nInode Times:\n");
    }

    if (fs->ftype == TSK_FS_TYPE_EXT4 && large_inodes) {
        tsk_fprintf(hFile, "Accessed:\t%s\n",
            tsk_fs_time_to_str_subsecs(fs_meta->atime, fs_meta->atime_nano,
                timeBuf));
        tsk_fprintf(hFile, "File Modified:\t%s\n",
            tsk_fs_time_to_str_subsecs(fs_meta->mtime, fs_meta->mtime_nano,
                timeBuf));
        tsk_fprintf(hFile, "Inode Modified:\t%s\n",
            tsk_fs_time_to_str_subsecs(fs_meta->ctime, fs_meta->ctime_nano,
                timeBuf));
    }
    else {
        tsk_fprintf(hFile, "Accessed:\t%s\n",
            tsk_fs_time_to_str(fs_meta->atime, timeBuf));
        tsk_fprintf(hFile, "File Modified:\t%s\n",
            tsk_fs_time_to_str(fs_meta->mtime, timeBuf));
        tsk_fprintf(hFile, "Inode Modified:\t%s\n",
            tsk_fs_time_to_str(fs_meta->ctime, timeBuf));
    }



    if (fs->ftype == TSK_FS_TYPE_EXT4 && large_inodes) {
        tsk_fprintf(hFile, "File Created:\t%s\n",
            tsk_fs_time_to_str_subsecs(fs_meta->crtime,
                fs_meta->crtime_nano, timeBuf));
    }
    if (fs_meta->time2.ext2.dtime)
        tsk_fprintf(hFile, "Deleted:\t%s\n",
            tsk_fs_time_to_str(fs_meta->time2.ext2.dtime, timeBuf));

    if (numblock > 0)
        fs_meta->size = numblock * fs->block_size;

    if (fs_meta->content_type != TSK_FS_META_CONTENT_TYPE_EXT4_INLINE) {
        tsk_fprintf(hFile, "\nDirect Blocks:\n");

        if (istat_flags & TSK_FS_ISTAT_RUNLIST) {
            const TSK_FS_ATTR *fs_attr_default =
                tsk_fs_file_attr_get_type(fs_file,
                    TSK_FS_ATTR_TYPE_DEFAULT, 0, 0);
            if (fs_attr_default && (fs_attr_default->flags & TSK_FS_ATTR_NONRES)) {
                if (tsk_fs_attr_print(fs_attr_default, hFile)) {
                    tsk_fprintf(hFile, "\nError creating run lists\n");
                    tsk_error_print(hFile);
                    tsk_error_reset();
                }
            }
        }
        else {
            print.idx = 0;
            print.hFile = hFile;

            if (tsk_fs_file_walk(fs_file, TSK_FS_FILE_WALK_FLAG_AONLY,
                print_addr_act, (void *)&print)) {
                tsk_fprintf(hFile, "\nError reading file:  ");
                tsk_error_print(hFile);
                tsk_error_reset();
            }
            else if (print.idx != 0) {
                tsk_fprintf(hFile, "\n");
            }
        }

        if (fs_meta->content_type == TSK_FS_META_CONTENT_TYPE_EXT4_EXTENTS) {
            const TSK_FS_ATTR *fs_attr_extent =
                tsk_fs_file_attr_get_type(fs_file,
                    TSK_FS_ATTR_TYPE_UNIX_EXTENT, 0, 0);
            if (fs_attr_extent) {
                tsk_fprintf(hFile, "\nExtent Blocks:\n");

                if (istat_flags & TSK_FS_ISTAT_RUNLIST) {
                    if (tsk_fs_attr_print(fs_attr_extent, hFile)) {
                        tsk_fprintf(hFile, "\nError creating run lists\n");
                        tsk_error_print(hFile);
                        tsk_error_reset();
                    }
                }
                else {
                    print.idx = 0;

                    if (tsk_fs_attr_walk(fs_attr_extent,
                        TSK_FS_FILE_WALK_FLAG_AONLY, print_addr_act,
                        (void *)&print)) {
                        tsk_fprintf(hFile,
                            "\nError reading indirect attribute:  ");
                        tsk_error_print(hFile);
                        tsk_error_reset();
                    }
                    else if (print.idx != 0) {
                        tsk_fprintf(hFile, "\n");
                    }
                }
            }
        }
        else {
            fs_attr_indir = tsk_fs_file_attr_get_type(fs_file,
                TSK_FS_ATTR_TYPE_UNIX_INDIR, 0, 0);
            if (fs_attr_indir) {
                tsk_fprintf(hFile, "\nIndirect Blocks:\n");
                if (istat_flags & TSK_FS_ISTAT_RUNLIST) {
                    tsk_fs_attr_print(fs_attr_indir, hFile);
                }
                else {
                    print.idx = 0;

                    if (tsk_fs_attr_walk(fs_attr_indir,
                        TSK_FS_FILE_WALK_FLAG_AONLY, print_addr_act,
                        (void *)&print)) {
                        tsk_fprintf(hFile,
                            "\nError reading indirect attribute:  ");
                        tsk_error_print(hFile);
                        tsk_error_reset();
                    }
                    else if (print.idx != 0) {
                        tsk_fprintf(hFile, "\n");
                    }
                }
            }
        }
    }

    tsk_fs_file_close(fs_file);
    free(dino_buf);
    return 0;
}


/* ext2fs_close - close an ext2fs file system */

static void
ext2fs_close(TSK_FS_INFO * fs)
{
    EXT2FS_INFO *ext2fs = (EXT2FS_INFO *) fs;

    fs->tag = 0;
    free(ext2fs->fs);
    free(ext2fs->grp_buf);
    free(ext2fs->ext4_grp_buf);
    free(ext2fs->bmap_buf);
    free(ext2fs->imap_buf);

    tsk_deinit_lock(&ext2fs->lock);

    tsk_fs_free(fs);
}

/**
 * \internal
 * Open part of a disk image as a Ext2/3 file system.
 *
 * @param img_info Disk image to analyze
 * @param offset Byte offset where file system starts
 * @param ftype Specific type of file system
 * @param test NOT USED
 * @returns NULL on error or if data is not an Ext2/3 file system
 */
TSK_FS_INFO *
ext2fs_open(TSK_IMG_INFO * img_info, TSK_OFF_T offset,
    TSK_FS_TYPE_ENUM ftype, uint8_t test)
{
    EXT2FS_INFO *ext2fs;
    unsigned int len;
    TSK_FS_INFO *fs;
    ssize_t cnt;

    // clean up any error messages that are lying around
    tsk_error_reset();

    if (TSK_FS_TYPE_ISEXT(ftype) == 0) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_ARG);
        tsk_error_set_errstr("Invalid FS Type in ext2fs_open");
        return NULL;
    }

    if (img_info->sector_size == 0) {
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_ARG);
        tsk_error_set_errstr("ext2fs_open: sector size is 0");
        return NULL;
    }

    if ((ext2fs = (EXT2FS_INFO *) tsk_fs_malloc(sizeof(*ext2fs))) == NULL)
        return NULL;

    fs = &(ext2fs->fs_info);

    fs->ftype = ftype;
    fs->flags = 0;
    fs->img_info = img_info;
    fs->offset = offset;
    fs->tag = TSK_FS_INFO_TAG;

    /*
     * Read the superblock.
     */
    len = sizeof(ext2fs_sb);
    if ((ext2fs->fs = (ext2fs_sb *) tsk_malloc(len)) == NULL) {
        fs->tag = 0;
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        return NULL;
    }

    cnt = tsk_fs_read(fs, EXT2FS_SBOFF, (char *) ext2fs->fs, len);
    if (cnt != len) {
        if (cnt >= 0) {
            tsk_error_reset();
            tsk_error_set_errno(TSK_ERR_FS_READ);
        }
        tsk_error_set_errstr2("ext2fs_open: superblock");
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        return NULL;
    }

    /*
     * Verify we are looking at an EXTxFS image
     */
    if (tsk_fs_guessu16(fs, ext2fs->fs->s_magic, EXT2FS_FS_MAGIC)) {
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_MAGIC);
        tsk_error_set_errstr("not an EXTxFS file system (magic)");
        if (tsk_verbose)
            fprintf(stderr, "ext2fs_open: invalid magic\n");
        return NULL;
    }

    if (tsk_verbose) {
        if (tsk_getu32(fs->endian, ext2fs->fs->s_feature_ro_compat) &
            EXT2FS_FEATURE_RO_COMPAT_SPARSE_SUPER)
            tsk_fprintf(stderr, "File system has sparse super blocks\n");

        tsk_fprintf(stderr, "First data block is %" PRIu32 "\n",
            tsk_getu32(fs->endian, ext2fs->fs->s_first_data_block));
    }

    /* If autodetect was given, look for the journal */
    if (ftype == TSK_FS_TYPE_EXT_DETECT) {
        if (tsk_getu32(fs->endian, ext2fs->fs->s_feature_incompat) &
            EXT2FS_FEATURE_INCOMPAT_EXTENTS) {
            fs->ftype = TSK_FS_TYPE_EXT4;
            fs->flags |= TSK_FS_INFO_FLAG_HAVE_NANOSEC;
        }
        else if (tsk_getu32(fs->endian, ext2fs->fs->s_feature_compat) &
            EXT2FS_FEATURE_COMPAT_HAS_JOURNAL)
            fs->ftype = TSK_FS_TYPE_EXT3;
        else
            fs->ftype = TSK_FS_TYPE_EXT2;
    }
    fs->duname = "Fragment";


    /* we need to figure out if dentries are v1 or v2 */
    if (tsk_getu32(fs->endian, ext2fs->fs->s_feature_incompat) &
        EXT2FS_FEATURE_INCOMPAT_FILETYPE)
        ext2fs->deentry_type = EXT2_DE_V2;
    else
        ext2fs->deentry_type = EXT2_DE_V1;


    /*
     * Calculate the meta data info
     */
    fs->inum_count = tsk_getu32(fs->endian, ext2fs->fs->s_inodes_count) + 1;    // we are adding 1 in this calc to account for Orphans directory
    fs->last_inum = fs->inum_count;
    fs->first_inum = EXT2FS_FIRSTINO;
    fs->root_inum = EXT2FS_ROOTINO;

    if (fs->inum_count < 10) {
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_MAGIC);
        tsk_error_set_errstr("Not an EXTxFS file system (inum count)");
        if (tsk_verbose)
            fprintf(stderr, "ext2fs_open: two few inodes\n");
        return NULL;
    }


    /* Set the size of the inode, but default to our data structure
     * size if it is larger */
    ext2fs->inode_size = tsk_getu16(fs->endian, ext2fs->fs->s_inode_size);
    if (ext2fs->inode_size < sizeof(ext2fs_inode)) {
        if (tsk_verbose)
            tsk_fprintf(stderr, "SB inode size is small");
    }


    /*
     * Calculate the block info
     */
    fs->dev_bsize = img_info->sector_size;
    if (tsk_getu32(fs->endian,
            ext2fs->fs->
            s_feature_incompat) & EXT2FS_FEATURE_INCOMPAT_64BIT) {
//        printf("DEBUG fs_open: 64bit file system\n");
        fs->block_count =
            ext4_getu64(fs->endian, ext2fs->fs->s_blocks_count_hi,
            ext2fs->fs->s_blocks_count);
    }
    else {
        fs->block_count =
            tsk_getu32(fs->endian, ext2fs->fs->s_blocks_count);
    }
    fs->first_block = 0;
    fs->last_block_act = fs->last_block = fs->block_count - 1;
    ext2fs->first_data_block =
        tsk_getu32(fs->endian, ext2fs->fs->s_first_data_block);

    if (tsk_getu32(fs->endian, ext2fs->fs->s_log_block_size) !=
        tsk_getu32(fs->endian, ext2fs->fs->s_log_frag_size)) {
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_UNSUPFUNC);
        tsk_error_set_errstr
            ("This file system has fragments that are a different size than blocks, which is not currently supported\nContact brian with details of the system that created this image");
        if (tsk_verbose)
            fprintf(stderr,
                "ext2fs_open: fragment size not equal to block size\n");
        return NULL;
    }

    if (tsk_getu32(fs->endian, ext2fs->fs->s_log_block_size) >= sizeof(uint32_t) * 8) {
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_CORRUPT);
        tsk_error_set_errstr("Block size too large");
        if (tsk_verbose)
            fprintf(stderr,
                "ext2fs_open: block size too large\n");
        return NULL;
    }

    fs->block_size =
        EXT2FS_MIN_BLOCK_SIZE << tsk_getu32(fs->endian,
        ext2fs->fs->s_log_block_size);

    // sanity check
    if ((fs->block_size == 0) || (fs->block_size % 512)) {
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_MAGIC);
        tsk_error_set_errstr("Not an EXTxFS file system (block size)");
        if (tsk_verbose)
            fprintf(stderr, "ext2fs_open: invalid block size\n");
        return NULL;
    }

    // determine the last block we have in this image
    if ((TSK_DADDR_T) ((img_info->size - offset) / fs->block_size) <
        fs->block_count)
        fs->last_block_act =
            (img_info->size - offset) / fs->block_size - 1;


    /* The group descriptors are located in the block following the
     * super block */
    ext2fs->groups_offset =
        roundup((EXT2FS_SBOFF + sizeof(ext2fs_sb)), fs->block_size);

    // sanity check to avoid divide by zero issues
    if (tsk_getu32(fs->endian, ext2fs->fs->s_blocks_per_group) == 0) {
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_MAGIC);
        tsk_error_set_errstr("Not an EXTxFS file system (blocks per group)");
        if (tsk_verbose)
            fprintf(stderr, "ext2fs_open: blocks per group is 0\n");
        return NULL;
    }
    if (tsk_getu32(fs->endian, ext2fs->fs->s_inodes_per_group) == 0) {
        fs->tag = 0;
        free(ext2fs->fs);
        tsk_fs_free((TSK_FS_INFO *)ext2fs);
        tsk_error_reset();
        tsk_error_set_errno(TSK_ERR_FS_MAGIC);
        tsk_error_set_errstr("Not an EXTxFS file system (inodes per group)");
        if (tsk_verbose)
            fprintf(stderr, "ext2fs_open: inodes per group is 0\n");
        return NULL;
    }

    if (tsk_getu32(fs->endian,
            ext2fs->fs->
            s_feature_incompat) & EXT2FS_FEATURE_INCOMPAT_64BIT) {
        ext2fs->groups_count =
            (EXT2_GRPNUM_T) ((ext4_getu64(fs->endian,
                    ext2fs->fs->s_blocks_count_hi,
                    ext2fs->fs->s_blocks_count)
                - ext2fs->first_data_block + tsk_getu32(fs->endian,
                    ext2fs->fs->s_blocks_per_group) - 1)
            / tsk_getu32(fs->endian, ext2fs->fs->s_blocks_per_group));
    }
    else {
        ext2fs->groups_count =
            (EXT2_GRPNUM_T) ((tsk_getu32(fs->endian,
                    ext2fs->fs->s_blocks_count) -
                ext2fs->first_data_block + tsk_getu32(fs->endian,
                    ext2fs->fs->s_blocks_per_group) -
                1) / tsk_getu32(fs->endian,
                ext2fs->fs->s_blocks_per_group));
    }

    /* Volume ID */
    for (fs->fs_id_used = 0; fs->fs_id_used < 16; fs->fs_id_used++) {
        fs->fs_id[fs->fs_id_used] = ext2fs->fs->s_uuid[fs->fs_id_used];
    }

    /* Set the generic function pointers */
    fs->inode_walk = ext2fs_inode_walk;
    fs->block_walk = ext2fs_block_walk;
    fs->block_getflags = ext2fs_block_getflags;

    fs->get_default_attr_type = tsk_fs_unix_get_default_attr_type;
    //fs->load_attrs = tsk_fs_unix_make_data_run;
    fs->load_attrs = ext2fs_load_attrs;

    fs->file_add_meta = ext2fs_inode_lookup;
    fs->dir_open_meta = ext2fs_dir_open_meta;
    fs->fsstat = ext2fs_fsstat;
    fs->fscheck = ext2fs_fscheck;
    fs->istat = ext2fs_istat;
    fs->name_cmp = tsk_fs_unix_name_cmp;
    fs->close = ext2fs_close;


    /* Journal */
    fs->journ_inum = tsk_getu32(fs->endian, ext2fs->fs->s_journal_inum);
    fs->jblk_walk = ext2fs_jblk_walk;
    fs->jentry_walk = ext2fs_jentry_walk;
    fs->jopen = ext2fs_jopen;

    /* initialize the caches */
    /* inode map */
    ext2fs->imap_buf = NULL;
    ext2fs->imap_grp_num = 0xffffffff;

    /* block map */
    ext2fs->bmap_buf = NULL;
    ext2fs->bmap_grp_num = 0xffffffff;

    /* group descriptor */
    ext2fs->grp_buf = NULL;
    ext2fs->grp_num = 0xffffffff;


    /*
     * Print some stats.
     */
    if (tsk_verbose)
        tsk_fprintf(stderr,
            "inodes %" PRIu32 " root ino %" PRIuINUM " blocks %" PRIu32
            " blocks/group %" PRIu32 "\n", tsk_getu32(fs->endian,
                ext2fs->fs->s_inodes_count),
            fs->root_inum, tsk_getu32(fs->endian,
                ext2fs->fs->s_blocks_count), tsk_getu32(fs->endian,
                ext2fs->fs->s_blocks_per_group));

    tsk_init_lock(&ext2fs->lock);

    return fs;
}