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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* dir.h - This file is part of libsquashfs
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef SQFS_DIR_H
#define SQFS_DIR_H
#include "sqfs/predef.h"
/**
* @file dir.h
*
* @brief Contains on-disk data structures for the directory table and
* declarations for the @ref sqfs_dir_writer_t.
*/
#define SQFS_MAX_DIR_ENT 256
/**
* @struct sqfs_dir_header_t
*
* @brief On-disk data structure of a directory header
*
* See @ref sqfs_dir_writer_t for an overview on how SquashFS stores
* directories on disk.
*/
struct sqfs_dir_header_t {
/**
* @brief The number of @ref sqfs_dir_entry_t entries that are
* following.
*
* This value is stored off by one and the total count must not
* exceed 256.
*/
uint32_t count;
/**
* @brief The location of the meta data block containing the inodes for
* the entries that follow, relative to the start of the inode
* table.
*/
uint32_t start_block;
/**
* @brief The inode number of the first entry.
*/
uint32_t inode_number;
};
/**
* @struct sqfs_dir_entry_t
*
* @brief On-disk data structure of a directory entry. Many of these
* follow a single @ref sqfs_dir_header_t.
*
* See @ref sqfs_dir_writer_t for an overview on how SquashFS stores
* directories on disk.
*/
struct sqfs_dir_entry_t {
/**
* @brief An offset into the uncompressed meta data block containing
* the coresponding inode.
*/
uint16_t offset;
/**
* @brief Signed difference of the inode number from the one
* in the @ref sqfs_dir_header_t.
*/
int16_t inode_diff;
/**
* @brief The @ref E_SQFS_INODE_TYPE value for the inode that this
* entry represents.
*/
uint16_t type;
/**
* @brief The size of the entry name
*
* This value is stored off-by-one.
*/
uint16_t size;
/**
* @brief The name of the directory entry (no trailing null-byte).
*/
uint8_t name[];
};
/**
* @struct sqfs_dir_index_t
*
* @brief On-disk data structure of a directory index. A series of those
* can follow an @ref sqfs_inode_dir_ext_t.
*
* See @ref sqfs_dir_writer_t for an overview on how SquashFS stores
* directories on disk.
*/
struct sqfs_dir_index_t {
/**
* @brief Linear byte offset into the decompressed directory listing.
*/
uint32_t index;
/**
* @brief Location of the meta data block, relative to the directory
* table start.
*/
uint32_t start_block;
/**
* @brief Size of the name of the first entry after the header.
*
* This value is stored off-by-one.
*/
uint32_t size;
/**
* @brief Name of the name of the first entry after the header.
*
* No trailing null-byte.
*/
uint8_t name[];
};
#endif /* SQFS_DIR_H */
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