/* vi: set sw=4 ts=4: */
/*
 * 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 Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <time.h>

#include "ext2_fs.h"
#include "ext2fs.h"
#include "ext2_ext_attr.h"

#if BB_BIG_ENDIAN
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_frag_size = ext2fs_swab32(sb->s_log_frag_size);
        sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
        sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_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_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
        sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
        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);
        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);
        for (i=0; i < 4; i++)
                sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
        for (i=0; i < 17; i++)
                sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
}

void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
{
        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);
}

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;
        int n;

        if (to_header != from_header)
                memcpy(to_header, from_header, bufsize);

        from_entry = (struct ext2_ext_attr_entry *)from_header;
        to_entry   = (struct ext2_ext_attr_entry *)to_header;

        if (has_header) {
                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);
                for (n=0; n<4; n++)
                        to_header->h_reserved[n] =
                                ext2fs_swab32(from_header->h_reserved[n]);
                from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
                to_entry   = (struct ext2_ext_attr_entry *)(to_header+1);
        }

        while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
                to_entry->e_value_offs  =
                        ext2fs_swab16(from_entry->e_value_offs);
                to_entry->e_value_block =
                        ext2fs_swab32(from_entry->e_value_block);
                to_entry->e_value_size  =
                        ext2fs_swab32(from_entry->e_value_size);
                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;
        int islnk = 0;
        __u32 *eaf, *eat;

        if (hostorder && LINUX_S_ISLNK(f->i_mode))
                islnk = 1;
        t->i_mode = ext2fs_swab16(f->i_mode);
        if (!hostorder && LINUX_S_ISLNK(t->i_mode))
                islnk = 1;
        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_blocks = ext2fs_swab32(f->i_blocks);
        t->i_flags = ext2fs_swab32(f->i_flags);
        t->i_file_acl = ext2fs_swab32(f->i_file_acl);
        t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
        if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) {
                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_reserved1 =
                        ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
                t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
                t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
                t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
                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_reserved2 =
                        ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
                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;
        case EXT2_OS_MASIX:
                t->osd1.masix1.m_i_reserved1 =
                        ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
                t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
                t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
                t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
                t->osd2.masix2.m_i_reserved2[0] =
                        ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
                t->osd2.masix2.m_i_reserved2[1] =
                        ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
                break;
        }

        if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
                return; /* no i_extra_isize field */

        t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
        if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) -
                                sizeof(struct ext2_inode)) {
                /* this is error case: i_extra_size is too large */
                return;
        }

        i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32);
        if (bufsize < (int) i)
                return; /* no space for EA magic */

        eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
                                        f->i_extra_isize);

        if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
                return; /* it seems no magic here */

        eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
                                        f->i_extra_isize);
        *eat = ext2fs_swab32(*eaf);

        /* convert EA(s) */
        ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
                             bufsize - sizeof(struct ext2_inode) -
                             t->i_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));
}

#endif