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Commit | Line | Data |
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50e1e10f TT |
1 | /* |
2 | * dirblock.c --- directory block routines. | |
efc6f628 | 3 | * |
21c84b71 TT |
4 | * Copyright (C) 1995, 1996 Theodore Ts'o. |
5 | * | |
6 | * %Begin-Header% | |
7 | * This file may be redistributed under the terms of the GNU Public | |
8 | * License. | |
9 | * %End-Header% | |
50e1e10f TT |
10 | */ |
11 | ||
12 | #include <stdio.h> | |
4cbe8af4 | 13 | #if HAVE_UNISTD_H |
50e1e10f | 14 | #include <unistd.h> |
4cbe8af4 | 15 | #endif |
21c84b71 | 16 | #include <string.h> |
50e1e10f | 17 | #include <time.h> |
50e1e10f | 18 | |
b5abe6fa | 19 | #include "ext2_fs.h" |
50e1e10f TT |
20 | #include "ext2fs.h" |
21 | ||
f9190c8a | 22 | errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block, |
54434927 | 23 | void *buf, int flags EXT2FS_ATTR((unused))) |
50e1e10f TT |
24 | { |
25 | errcode_t retval; | |
26 | char *p, *end; | |
27 | struct ext2_dir_entry *dirent; | |
126a291c | 28 | unsigned int name_len, rec_len; |
efc6f628 | 29 | |
50e1e10f TT |
30 | |
31 | retval = io_channel_read_blk(fs->io, block, 1, buf); | |
32 | if (retval) | |
33 | return retval; | |
126a291c | 34 | |
b5abe6fa | 35 | p = (char *) buf; |
50e1e10f | 36 | end = (char *) buf + fs->blocksize; |
e446d718 | 37 | while (p < end-8) { |
bfcd9a11 | 38 | dirent = (struct ext2_dir_entry *) p; |
126a291c TT |
39 | #ifdef WORDS_BIGENDIAN |
40 | dirent->inode = ext2fs_swab32(dirent->inode); | |
41 | dirent->rec_len = ext2fs_swab16(dirent->rec_len); | |
42 | dirent->name_len = ext2fs_swab16(dirent->name_len); | |
f9190c8a TT |
43 | #endif |
44 | name_len = dirent->name_len; | |
45 | #ifdef WORDS_BIGENDIAN | |
46 | if (flags & EXT2_DIRBLOCK_V2_STRUCT) | |
47 | dirent->name_len = ext2fs_swab16(dirent->name_len); | |
5df55d7f | 48 | #endif |
5dd77dbe TT |
49 | rec_len = (dirent->rec_len || fs->blocksize < 65536) ? |
50 | dirent->rec_len : 65536; | |
1cca4d60 TT |
51 | if ((rec_len < 8) || (rec_len % 4)) { |
52 | rec_len = 8; | |
53 | retval = EXT2_ET_DIR_CORRUPTED; | |
5dd77dbe | 54 | } else if (((name_len & 0xFF) + 8) > rec_len) |
1cca4d60 TT |
55 | retval = EXT2_ET_DIR_CORRUPTED; |
56 | p += rec_len; | |
50e1e10f | 57 | } |
1cca4d60 | 58 | return retval; |
50e1e10f TT |
59 | } |
60 | ||
f9190c8a TT |
61 | errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block, |
62 | void *buf) | |
50e1e10f | 63 | { |
f9190c8a TT |
64 | return ext2fs_read_dir_block2(fs, block, buf, 0); |
65 | } | |
66 | ||
67 | ||
68 | errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block, | |
54434927 | 69 | void *inbuf, int flags EXT2FS_ATTR((unused))) |
f9190c8a | 70 | { |
126a291c | 71 | #ifdef WORDS_BIGENDIAN |
50e1e10f | 72 | errcode_t retval; |
f9190c8a | 73 | char *p, *end; |
50e1e10f | 74 | char *buf = 0; |
5dd77dbe | 75 | int rec_len; |
50e1e10f TT |
76 | struct ext2_dir_entry *dirent; |
77 | ||
c4e3d3f3 | 78 | retval = ext2fs_get_mem(fs->blocksize, &buf); |
f9190c8a TT |
79 | if (retval) |
80 | return retval; | |
81 | memcpy(buf, inbuf, fs->blocksize); | |
82 | p = buf; | |
83 | end = buf + fs->blocksize; | |
84 | while (p < end) { | |
85 | dirent = (struct ext2_dir_entry *) p; | |
5dd77dbe TT |
86 | rec_len = (dirent->rec_len || fs->blocksize < 65536) ? |
87 | dirent->rec_len : 65536; | |
88 | if ((rec_len < 8) || | |
89 | (rec_len % 4)) { | |
c4e3d3f3 | 90 | ext2fs_free_mem(&buf); |
f9190c8a TT |
91 | return (EXT2_ET_DIR_CORRUPTED); |
92 | } | |
5dd77dbe | 93 | p += rec_len; |
126a291c TT |
94 | dirent->inode = ext2fs_swab32(dirent->inode); |
95 | dirent->rec_len = ext2fs_swab16(dirent->rec_len); | |
96 | dirent->name_len = ext2fs_swab16(dirent->name_len); | |
97 | ||
f9190c8a TT |
98 | if (flags & EXT2_DIRBLOCK_V2_STRUCT) |
99 | dirent->name_len = ext2fs_swab16(dirent->name_len); | |
f9190c8a TT |
100 | } |
101 | retval = io_channel_write_blk(fs->io, block, 1, buf); | |
c4e3d3f3 | 102 | ext2fs_free_mem(&buf); |
50e1e10f | 103 | return retval; |
f9190c8a TT |
104 | #else |
105 | return io_channel_write_blk(fs->io, block, 1, (char *) inbuf); | |
106 | #endif | |
50e1e10f TT |
107 | } |
108 | ||
109 | ||
f9190c8a TT |
110 | errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block, |
111 | void *inbuf) | |
112 | { | |
113 | return ext2fs_write_dir_block2(fs, block, inbuf, 0); | |
114 | } | |
115 |