diff options
Diffstat (limited to 'lib/ext2fs/swapfs.c')
| -rw-r--r-- | lib/ext2fs/swapfs.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c new file mode 100644 index 0000000..fe764b9 --- /dev/null +++ b/lib/ext2fs/swapfs.c @@ -0,0 +1,491 @@ +/* + * swapfs.c --- swap ext2 filesystem data structures + * + * Copyright (C) 1995, 1996, 2002 Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Library + * General Public License, version 2. + * %End-Header% + */ + +#include "config.h" +#include <stdio.h> +#if HAVE_UNISTD_H +#include <unistd.h> +#endif +#include <string.h> +#include <time.h> + +#include "ext2_fs.h" +#include "ext2fs.h" +#include "ext2fsP.h" +#include <ext2fs/ext2_ext_attr.h> + +void ext2fs_swap_super(struct ext2_super_block * sb) +{ + int i; + + sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); + sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); + sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); + sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); + sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); + sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); + sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); + sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size); + sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); + sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group); + sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); + sb->s_mtime = ext2fs_swab32(sb->s_mtime); + sb->s_wtime = ext2fs_swab32(sb->s_wtime); + sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); + sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); + sb->s_magic = ext2fs_swab16(sb->s_magic); + sb->s_state = ext2fs_swab16(sb->s_state); + sb->s_errors = ext2fs_swab16(sb->s_errors); + sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); + sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); + sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); + sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); + sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); + sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); + sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); + sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); + sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); + sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); + sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); + sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); + sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); + /* sb->s_uuid is __u8 and does not need swabbing */ + /* sb->s_volume_name is char and does not need swabbing */ + /* sb->s_last_mounted is char and does not need swabbing */ + sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); + /* sb->s_prealloc_blocks is __u8 and does not need swabbing */ + /* sb->s_prealloc_dir_blocks is __u8 and does not need swabbing */ + sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); + /* sb->s_journal_uuid is __u8 and does not need swabbing */ + sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); + sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); + sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); + for (i = 0; i < 4; i++) + sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); + /* sb->s_def_hash_version is __u8 and does not need swabbing */ + /* sb->s_jnl_backup_type is __u8 and does not need swabbing */ + sb->s_desc_size = ext2fs_swab16(sb->s_desc_size); + sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); + sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); + sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); + /* if journal backup is for a valid extent-based journal... */ + if (ext2fs_extent_header_verify(sb->s_jnl_blocks, + sizeof(sb->s_jnl_blocks)) == 0) { + /* ... swap only the journal i_size and i_size_high, + * and the extent data is not swapped on read */ + i = 15; + } else { + /* direct/indirect journal: swap it all */ + i = 0; + } + for (; i < 17; i++) + sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); + sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi); + sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi); + sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi); + sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize); + sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize); + sb->s_flags = ext2fs_swab32(sb->s_flags); + sb->s_raid_stride = ext2fs_swab16(sb->s_raid_stride); + sb->s_mmp_update_interval = ext2fs_swab16(sb->s_mmp_update_interval); + sb->s_mmp_block = ext2fs_swab64(sb->s_mmp_block); + sb->s_raid_stripe_width = ext2fs_swab32(sb->s_raid_stripe_width); + /* sb->s_log_groups_per_flex is __u8 and does not need swabbing */ + /* sb->s_checksum_type is __u8 and does not need swabbing */ + /* sb->s_encryption_level is __u8 and does not need swabbing */ + /* sb->s_reserved_pad is __u8 and does not need swabbing */ + sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written); + sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum); + sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id); + sb->s_snapshot_r_blocks_count = + ext2fs_swab64(sb->s_snapshot_r_blocks_count); + sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list); + sb->s_error_count = ext2fs_swab32(sb->s_error_count); + sb->s_first_error_time = ext2fs_swab32(sb->s_first_error_time); + sb->s_first_error_ino = ext2fs_swab32(sb->s_first_error_ino); + sb->s_first_error_block = ext2fs_swab64(sb->s_first_error_block); + /* sb->s_first_error_func is __u8 and does not need swabbing */ + sb->s_last_error_time = ext2fs_swab32(sb->s_last_error_time); + sb->s_last_error_ino = ext2fs_swab32(sb->s_last_error_ino); + sb->s_last_error_block = ext2fs_swab64(sb->s_last_error_block); + /* sb->s_last_error_func is __u8 and does not need swabbing */ + /* sb->s_mount_opts is __u8 and does not need swabbing */ + sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum); + sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum); + sb->s_overhead_clusters = ext2fs_swab32(sb->s_overhead_clusters); + sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]); + sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]); + /* sb->s_encrypt_algos is __u8 and does not need swabbing */ + /* sb->s_encrypt_pw_salt is __u8 and does not need swabbing */ + sb->s_lpf_ino = ext2fs_swab32(sb->s_lpf_ino); + sb->s_prj_quota_inum = ext2fs_swab32(sb->s_prj_quota_inum); + sb->s_checksum_seed = ext2fs_swab32(sb->s_checksum_seed); + /* s_*_time_hi are __u8 and does not need swabbing */ + sb->s_encoding = ext2fs_swab16(sb->s_encoding); + sb->s_encoding_flags = ext2fs_swab16(sb->s_encoding_flags); + sb->s_orphan_file_inum = ext2fs_swab32(sb->s_orphan_file_inum); + /* catch when new fields are used from s_reserved */ + EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 94 * sizeof(__le32)); + sb->s_checksum = ext2fs_swab32(sb->s_checksum); +} + +void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp) +{ + struct ext4_group_desc *gdp4 = (struct ext4_group_desc *)gdp; + + /* Do the 32-bit parts first */ + gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); + gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); + gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); + gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); + gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); + gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); + gdp->bg_flags = ext2fs_swab16(gdp->bg_flags); + gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo); + gdp->bg_block_bitmap_csum_lo = + ext2fs_swab16(gdp->bg_block_bitmap_csum_lo); + gdp->bg_inode_bitmap_csum_lo = + ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo); + gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused); + gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum); + /* If we're 32-bit, we're done */ + if (fs == NULL || EXT2_DESC_SIZE(fs->super) < EXT2_MIN_DESC_SIZE_64BIT) + return; + + /* Swap the 64-bit parts */ + gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi); + gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi); + gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi); + gdp4->bg_free_blocks_count_hi = + ext2fs_swab16(gdp4->bg_free_blocks_count_hi); + gdp4->bg_free_inodes_count_hi = + ext2fs_swab16(gdp4->bg_free_inodes_count_hi); + gdp4->bg_used_dirs_count_hi = + ext2fs_swab16(gdp4->bg_used_dirs_count_hi); + gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi); + gdp4->bg_exclude_bitmap_hi = ext2fs_swab16(gdp4->bg_exclude_bitmap_hi); + gdp4->bg_block_bitmap_csum_hi = + ext2fs_swab16(gdp4->bg_block_bitmap_csum_hi); + gdp4->bg_inode_bitmap_csum_hi = + ext2fs_swab16(gdp4->bg_inode_bitmap_csum_hi); + EXT2FS_BUILD_BUG_ON(sizeof(gdp4->bg_reserved) != sizeof(__u32)); +} + +void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) +{ + ext2fs_swap_group_desc2(0, gdp); +} + + +void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header, + struct ext2_ext_attr_header *from_header) +{ + int n; + + to_header->h_magic = ext2fs_swab32(from_header->h_magic); + to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); + to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); + to_header->h_hash = ext2fs_swab32(from_header->h_hash); + to_header->h_checksum = ext2fs_swab32(from_header->h_checksum); + for (n = 0; n < 3; n++) + to_header->h_reserved[n] = + ext2fs_swab32(from_header->h_reserved[n]); +} + +void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry, + struct ext2_ext_attr_entry *from_entry) +{ + to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs); + to_entry->e_value_inum = ext2fs_swab32(from_entry->e_value_inum); + to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size); + to_entry->e_hash = ext2fs_swab32(from_entry->e_hash); +} + +void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header) +{ + struct ext2_ext_attr_header *from_header = + (struct ext2_ext_attr_header *)from; + struct ext2_ext_attr_header *to_header = + (struct ext2_ext_attr_header *)to; + struct ext2_ext_attr_entry *from_entry, *to_entry; + char *from_end = (char *)from_header + bufsize; + + if (to_header != from_header) + memcpy(to_header, from_header, bufsize); + + if (has_header) { + ext2fs_swap_ext_attr_header(to_header, from_header); + + from_entry = (struct ext2_ext_attr_entry *)(from_header+1); + to_entry = (struct ext2_ext_attr_entry *)(to_header+1); + } else { + from_entry = (struct ext2_ext_attr_entry *)from_header; + to_entry = (struct ext2_ext_attr_entry *)to_header; + } + + while ((char *)from_entry < from_end && + (char *)EXT2_EXT_ATTR_NEXT(from_entry) <= from_end && + *(__u32 *)from_entry) { + ext2fs_swap_ext_attr_entry(to_entry, from_entry); + from_entry = EXT2_EXT_ATTR_NEXT(from_entry); + to_entry = EXT2_EXT_ATTR_NEXT(to_entry); + } +} + +void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, + struct ext2_inode_large *f, int hostorder, + int bufsize) +{ + unsigned i, extra_isize, attr_magic; + int has_extents = 0, has_inline_data = 0, islnk = 0, fast_symlink = 0; + unsigned int inode_size; + __u32 *eaf, *eat; + + /* + * Note that t and f may point to the same address. That's why + * if (hostorder) condition is executed before swab calls and + * if (!hostorder) afterwards. + */ + if (hostorder) { + islnk = LINUX_S_ISLNK(f->i_mode); + fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(f)); + has_extents = (f->i_flags & EXT4_EXTENTS_FL) != 0; + has_inline_data = (f->i_flags & EXT4_INLINE_DATA_FL) != 0; + } + + t->i_mode = ext2fs_swab16(f->i_mode); + t->i_uid = ext2fs_swab16(f->i_uid); + t->i_size = ext2fs_swab32(f->i_size); + t->i_atime = ext2fs_swab32(f->i_atime); + t->i_ctime = ext2fs_swab32(f->i_ctime); + t->i_mtime = ext2fs_swab32(f->i_mtime); + t->i_dtime = ext2fs_swab32(f->i_dtime); + t->i_gid = ext2fs_swab16(f->i_gid); + t->i_links_count = ext2fs_swab16(f->i_links_count); + t->i_file_acl = ext2fs_swab32(f->i_file_acl); + t->i_blocks = ext2fs_swab32(f->i_blocks); + t->i_flags = ext2fs_swab32(f->i_flags); + t->i_size_high = ext2fs_swab32(f->i_size_high); + + if (!hostorder) { + islnk = LINUX_S_ISLNK(t->i_mode); + fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(t)); + has_extents = (t->i_flags & EXT4_EXTENTS_FL) != 0; + has_inline_data = (t->i_flags & EXT4_INLINE_DATA_FL) != 0; + } + + /* + * Extent data and inline data are swapped on access, not here + */ + if (!has_extents && !has_inline_data && (!islnk || !fast_symlink)) { + for (i = 0; i < EXT2_N_BLOCKS; i++) + t->i_block[i] = ext2fs_swab32(f->i_block[i]); + } else if (t != f) { + for (i = 0; i < EXT2_N_BLOCKS; i++) + t->i_block[i] = f->i_block[i]; + } + t->i_generation = ext2fs_swab32(f->i_generation); + t->i_faddr = ext2fs_swab32(f->i_faddr); + + switch (fs->super->s_creator_os) { + case EXT2_OS_LINUX: + t->osd1.linux1.l_i_version = + ext2fs_swab32(f->osd1.linux1.l_i_version); + t->osd2.linux2.l_i_blocks_hi = + ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi); + t->osd2.linux2.l_i_file_acl_high = + ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high); + t->osd2.linux2.l_i_uid_high = + ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); + t->osd2.linux2.l_i_gid_high = + ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); + t->osd2.linux2.l_i_checksum_lo = + ext2fs_swab16(f->osd2.linux2.l_i_checksum_lo); + break; + case EXT2_OS_HURD: + t->osd1.hurd1.h_i_translator = + ext2fs_swab32 (f->osd1.hurd1.h_i_translator); + t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; + t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; + t->osd2.hurd2.h_i_mode_high = + ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); + t->osd2.hurd2.h_i_uid_high = + ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); + t->osd2.hurd2.h_i_gid_high = + ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); + t->osd2.hurd2.h_i_author = + ext2fs_swab32 (f->osd2.hurd2.h_i_author); + break; + default: + break; + } + + if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) + return; /* no i_extra_isize field */ + + if (hostorder) + extra_isize = f->i_extra_isize; + t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); + if (!hostorder) + extra_isize = t->i_extra_isize; + if (extra_isize > EXT2_INODE_SIZE(fs->super) - + sizeof(struct ext2_inode)) { + /* this is error case: i_extra_size is too large */ + return; + } + if (extra_isize & 3) + return; /* Illegal inode extra_isize */ + + inode_size = EXT2_GOOD_OLD_INODE_SIZE + extra_isize; + if (inode_includes(inode_size, i_checksum_hi)) + t->i_checksum_hi = ext2fs_swab16(f->i_checksum_hi); + if (inode_includes(inode_size, i_ctime_extra)) + t->i_ctime_extra = ext2fs_swab32(f->i_ctime_extra); + if (inode_includes(inode_size, i_mtime_extra)) + t->i_mtime_extra = ext2fs_swab32(f->i_mtime_extra); + if (inode_includes(inode_size, i_atime_extra)) + t->i_atime_extra = ext2fs_swab32(f->i_atime_extra); + if (inode_includes(inode_size, i_crtime)) + t->i_crtime = ext2fs_swab32(f->i_crtime); + if (inode_includes(inode_size, i_crtime_extra)) + t->i_crtime_extra = ext2fs_swab32(f->i_crtime_extra); + if (inode_includes(inode_size, i_version_hi)) + t->i_version_hi = ext2fs_swab32(f->i_version_hi); + if (inode_includes(inode_size, i_projid)) + t->i_projid = ext2fs_swab32(f->i_projid); + /* catch new static fields added after i_projid */ + EXT2FS_BUILD_BUG_ON(sizeof(struct ext2_inode_large) != 160); + + i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32); + if (bufsize < (int) i) + return; /* no space for EA magic */ + + eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + + extra_isize); + + attr_magic = *eaf; + if (!hostorder) + attr_magic = ext2fs_swab32(attr_magic); + + if (attr_magic != EXT2_EXT_ATTR_MAGIC) + return; /* it seems no magic here */ + + eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + + extra_isize); + *eat = ext2fs_swab32(*eaf); + + /* convert EA(s) */ + ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), + bufsize - sizeof(struct ext2_inode) - + extra_isize - sizeof(__u32), 0); + +} + +void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t, + struct ext2_inode *f, int hostorder) +{ + ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t, + (struct ext2_inode_large *) f, hostorder, + sizeof(struct ext2_inode)); +} + +void ext2fs_swap_mmp(struct mmp_struct *mmp) +{ + mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic); + mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq); + mmp->mmp_time = ext2fs_swab64(mmp->mmp_time); + mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval); + mmp->mmp_checksum = ext2fs_swab32(mmp->mmp_checksum); +} + +errcode_t ext2fs_dirent_swab_in(ext2_filsys fs, char *buf, int flags) +{ + return ext2fs_dirent_swab_in2(fs, buf, fs->blocksize, flags); +} + +errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf, + size_t size, int flags) +{ + errcode_t retval; + char *p, *end; + struct ext2_dir_entry *dirent; + unsigned int name_len, rec_len, left; + + p = (char *) buf; + end = (char *) buf + size; + left = size; + while (p < end-8) { + dirent = (struct ext2_dir_entry *) p; + dirent->inode = ext2fs_swab32(dirent->inode); + dirent->rec_len = ext2fs_swab16(dirent->rec_len); + dirent->name_len = ext2fs_swab16(dirent->name_len); + name_len = dirent->name_len; + if (flags & EXT2_DIRBLOCK_V2_STRUCT) + dirent->name_len = ext2fs_swab16(dirent->name_len); + retval = ext2fs_get_rec_len(fs, dirent, &rec_len); + if (retval) + return retval; + if ((rec_len < 8) || (rec_len % 4)) { + rec_len = 8; + if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT)) + return EXT2_ET_DIR_CORRUPTED; + } else if (((name_len & 0xFF) + 8) > rec_len) + if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT)) + return EXT2_ET_DIR_CORRUPTED; + if (rec_len > left) + if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT)) + return EXT2_ET_DIR_CORRUPTED; + left -= rec_len; + p += rec_len; + } + + return 0; +} + +errcode_t ext2fs_dirent_swab_out(ext2_filsys fs, char *buf, int flags) +{ + return ext2fs_dirent_swab_out2(fs, buf, fs->blocksize, flags); +} + +errcode_t ext2fs_dirent_swab_out2(ext2_filsys fs, char *buf, + size_t size, int flags) +{ + errcode_t retval; + char *p, *end; + unsigned int rec_len; + struct ext2_dir_entry *dirent; + + p = buf; + end = buf + size; + while (p < end) { + dirent = (struct ext2_dir_entry *) p; + retval = ext2fs_get_rec_len(fs, dirent, &rec_len); + if (retval) + return retval; + if ((rec_len < 8) || + (rec_len % 4)) { + ext2fs_free_mem(&buf); + return EXT2_ET_DIR_CORRUPTED; + } + p += rec_len; + dirent->inode = ext2fs_swab32(dirent->inode); + dirent->rec_len = ext2fs_swab16(dirent->rec_len); + dirent->name_len = ext2fs_swab16(dirent->name_len); + if (rec_len > size) + return EXT2_ET_DIR_CORRUPTED; + size -= rec_len; + + if (flags & EXT2_DIRBLOCK_V2_STRUCT) + dirent->name_len = ext2fs_swab16(dirent->name_len); + } + + return 0; +} |