| /* |
| * dirblock.c --- directory block routines. |
| * |
| * Copyright (C) 1995, 1996 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| |
| #include <linux/ext2_fs.h> |
| |
| #include "ext2fs.h" |
| |
| errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block, |
| void *buf) |
| { |
| errcode_t retval; |
| char *p, *end; |
| struct ext2_dir_entry *dirent; |
| |
| retval = io_channel_read_blk(fs->io, block, 1, buf); |
| if (retval) |
| return retval; |
| if ((fs->flags & (EXT2_FLAG_SWAP_BYTES| |
| EXT2_FLAG_SWAP_BYTES_READ)) == 0) |
| return 0; |
| p = buf; |
| end = (char *) buf + fs->blocksize; |
| while (p < end) { |
| 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); |
| p += (dirent->rec_len < 8) ? 8 : dirent->rec_len; |
| } |
| return 0; |
| } |
| |
| errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block, |
| void *inbuf) |
| { |
| errcode_t retval; |
| char *p, *end, *write_buf; |
| char *buf = 0; |
| struct ext2_dir_entry *dirent; |
| |
| if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || |
| (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) { |
| write_buf = buf = malloc(fs->blocksize); |
| if (!buf) |
| return EXT2_NO_MEMORY; |
| memcpy(buf, inbuf, fs->blocksize); |
| p = buf; |
| end = buf + fs->blocksize; |
| while (p < end) { |
| dirent = (struct ext2_dir_entry *) p; |
| p += (dirent->rec_len < 8) ? 8 : dirent->rec_len; |
| dirent->inode = ext2fs_swab32(dirent->inode); |
| dirent->rec_len = ext2fs_swab16(dirent->rec_len); |
| dirent->name_len = ext2fs_swab16(dirent->name_len); |
| } |
| } else |
| write_buf = inbuf; |
| retval = io_channel_write_blk(fs->io, block, 1, write_buf); |
| if (buf) |
| free(buf); |
| return retval; |
| } |
| |
| |