| 1 | /*
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| 2 | * Copyright (c) 2011 Frantisek Princ
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libext4
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | #ifndef LIBEXT4_LIBEXT4_DIRECTORY_H_
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| 34 | #define LIBEXT4_LIBEXT4_DIRECTORY_H_
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| 35 |
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| 36 | #include "libext4_filesystem.h"
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| 37 | #include "libext4_inode.h"
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| 38 |
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| 39 | #define EXT4_DIRECTORY_FILENAME_LEN 255
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| 40 |
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| 41 | /**
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| 42 | * Linked list directory entry structure
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| 43 | */
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| 44 | typedef struct ext4_directory_entry_ll {
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| 45 | uint32_t inode; // Inode for the entry
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| 46 | uint16_t entry_length; // Distance to the next directory entry
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| 47 | uint8_t name_length; // Lower 8 bits of name length
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| 48 | union {
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| 49 | uint8_t name_length_high; // Higher 8 bits of name length
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| 50 | uint8_t inode_type; // Type of referenced inode (in rev >= 0.5)
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| 51 | } __attribute__ ((packed));
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| 52 | uint8_t name[EXT4_DIRECTORY_FILENAME_LEN]; // Entry name
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| 53 | } __attribute__ ((packed)) ext4_directory_entry_ll_t;
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| 54 |
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| 55 | typedef struct ext4_directory_iterator {
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| 56 | ext4_filesystem_t *fs;
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| 57 | ext4_inode_ref_t *inode_ref;
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| 58 | block_t *current_block;
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| 59 | aoff64_t current_offset;
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| 60 | ext4_directory_entry_ll_t *current;
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| 61 | } ext4_directory_iterator_t;
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| 62 |
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| 63 |
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| 64 | /* Structures for indexed directory */
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| 65 |
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| 66 | typedef struct ext4_directory_dx_dot_entry {
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| 67 | uint32_t inode;
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| 68 | uint16_t entry_length;
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| 69 | uint8_t name_length;
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| 70 | uint8_t inode_type;
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| 71 | uint8_t name[4];
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| 72 | } ext4_directory_dx_dot_entry_t;
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| 73 |
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| 74 | typedef struct ext4_directory_dx_root_info {
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| 75 | uint32_t reserved_zero;
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| 76 | uint8_t hash_version;
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| 77 | uint8_t info_length;
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| 78 | uint8_t indirect_levels;
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| 79 | uint8_t unused_flags;
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| 80 | } ext4_directory_dx_root_info_t;
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| 81 |
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| 82 | typedef struct ext4_directory_dx_entry {
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| 83 | uint32_t hash;
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| 84 | uint32_t block;
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| 85 | } ext4_directory_dx_entry_t;
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| 86 |
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| 87 | typedef struct ext4_directory_dx_root {
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| 88 | ext4_directory_dx_dot_entry_t dots[2];
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| 89 | // TODO insert root info items instead of special datatype
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| 90 | ext4_directory_dx_root_info_t info;
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| 91 | ext4_directory_dx_entry_t *entries;
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| 92 | } ext4_directory_dx_root_t;
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| 93 |
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| 94 |
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| 95 | #define EXT4_DIRECTORY_HTREE_EOF 0x7fffffff
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| 96 |
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| 97 |
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| 98 | extern uint32_t ext4_directory_entry_ll_get_inode(ext4_directory_entry_ll_t *);
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| 99 | extern uint16_t ext4_directory_entry_ll_get_entry_length(
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| 100 | ext4_directory_entry_ll_t *);
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| 101 | extern uint16_t ext4_directory_entry_ll_get_name_length(
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| 102 | ext4_superblock_t *, ext4_directory_entry_ll_t *);
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| 103 |
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| 104 | extern int ext4_directory_iterator_init(ext4_directory_iterator_t *,
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| 105 | ext4_filesystem_t *, ext4_inode_ref_t *, aoff64_t);
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| 106 | extern int ext4_directory_iterator_next(ext4_directory_iterator_t *);
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| 107 | extern int ext4_directory_iterator_seek(ext4_directory_iterator_t *, aoff64_t pos);
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| 108 | extern int ext4_directory_iterator_fini(ext4_directory_iterator_t *);
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| 109 |
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| 110 | #endif
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| 111 |
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| 112 | /**
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| 113 | * @}
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| 114 | */
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