mirror of https://github.com/vitalif/e2fsprogs
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
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* dirblock.c --- directory block routines.
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*
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* Copyright (C) 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
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void *buf)
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{
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errcode_t retval;
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char *p, *end;
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struct ext2_dir_entry *dirent;
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retval = io_channel_read_blk(fs->io, block, 1, buf);
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if (retval)
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return retval;
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if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
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EXT2_FLAG_SWAP_BYTES_READ)) == 0)
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return 0;
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p = buf;
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end = (char *) buf + fs->blocksize;
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while (p < end) {
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dirent = (struct ext2_dir_entry *) p;
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dirent->inode = ext2fs_swab32(dirent->inode);
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dirent->rec_len = ext2fs_swab16(dirent->rec_len);
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dirent->name_len = ext2fs_swab16(dirent->name_len);
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p += (dirent->rec_len < 8) ? 8 : dirent->rec_len;
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}
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return 0;
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}
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errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
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void *inbuf)
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{
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errcode_t retval;
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char *p, *end, *write_buf;
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char *buf = 0;
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struct ext2_dir_entry *dirent;
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if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
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write_buf = buf = malloc(fs->blocksize);
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if (!buf)
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return ENOMEM;
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memcpy(buf, inbuf, fs->blocksize);
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p = buf;
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end = buf + fs->blocksize;
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while (p < end) {
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dirent = (struct ext2_dir_entry *) p;
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p += (dirent->rec_len < 8) ? 8 : dirent->rec_len;
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dirent->inode = ext2fs_swab32(dirent->inode);
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dirent->rec_len = ext2fs_swab16(dirent->rec_len);
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dirent->name_len = ext2fs_swab16(dirent->name_len);
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}
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} else
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write_buf = inbuf;
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retval = io_channel_write_blk(fs->io, block, 1, write_buf);
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if (buf)
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free(buf);
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return retval;
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}
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