2 * dirblock.c --- directory block routines.
4 * Copyright (C) 1995, 1996 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
22 errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block,
23 void *buf, int flags EXT2FS_ATTR((unused)))
27 struct ext2_dir_entry *dirent;
28 unsigned int name_len, rec_len;
33 retval = io_channel_read_blk(fs->io, block, 1, buf);
37 do_swap = (fs->flags & (EXT2_FLAG_SWAP_BYTES|
38 EXT2_FLAG_SWAP_BYTES_READ)) != 0;
41 end = (char *) buf + fs->blocksize;
43 dirent = (struct ext2_dir_entry *) p;
46 dirent->inode = ext2fs_swab32(dirent->inode);
47 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
48 dirent->name_len = ext2fs_swab16(dirent->name_len);
51 name_len = dirent->name_len;
52 #ifdef WORDS_BIGENDIAN
53 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
54 dirent->name_len = ext2fs_swab16(dirent->name_len);
56 rec_len = dirent->rec_len;
57 if ((rec_len < 8) || (rec_len % 4)) {
59 retval = EXT2_ET_DIR_CORRUPTED;
61 if (((name_len & 0xFF) + 8) > dirent->rec_len)
62 retval = EXT2_ET_DIR_CORRUPTED;
68 errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
71 return ext2fs_read_dir_block2(fs, block, buf, 0);
75 errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
76 void *inbuf, int flags EXT2FS_ATTR((unused)))
83 struct ext2_dir_entry *dirent;
85 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
86 (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
89 #ifndef WORDS_BIGENDIAN
91 return io_channel_write_blk(fs->io, block, 1, (char *) inbuf);
94 retval = ext2fs_get_mem(fs->blocksize, &buf);
97 memcpy(buf, inbuf, fs->blocksize);
99 end = buf + fs->blocksize;
101 dirent = (struct ext2_dir_entry *) p;
102 if ((dirent->rec_len < 8) ||
103 (dirent->rec_len % 4)) {
104 ext2fs_free_mem(&buf);
105 return (EXT2_ET_DIR_CORRUPTED);
107 p += dirent->rec_len;
109 dirent->inode = ext2fs_swab32(dirent->inode);
110 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
111 dirent->name_len = ext2fs_swab16(dirent->name_len);
113 #ifdef WORDS_BIGENDIAN
114 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
115 dirent->name_len = ext2fs_swab16(dirent->name_len);
118 retval = io_channel_write_blk(fs->io, block, 1, buf);
119 ext2fs_free_mem(&buf);
122 return io_channel_write_blk(fs->io, block, 1, (char *) inbuf);
127 errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
130 return ext2fs_write_dir_block2(fs, block, inbuf, 0);