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longpanda
264
SQUASHFS/squashfs-tools-4.4/squashfs-tools/unsquashfs.h
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264
SQUASHFS/squashfs-tools-4.4/squashfs-tools/unsquashfs.h
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#ifndef UNSQUASHFS_H
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#define UNSQUASHFS_H
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/*
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* Unsquash a squashfs filesystem. This is a highly compressed read only
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* filesystem.
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*
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* Copyright (c) 2009, 2010, 2013, 2014, 2019
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* Phillip Lougher <phillip@squashfs.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* unsquashfs.h
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*/
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#define TRUE 1
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#define FALSE 0
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <utime.h>
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#include <pwd.h>
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#include <grp.h>
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#include <time.h>
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#include <regex.h>
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#include <signal.h>
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#include <pthread.h>
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#include <math.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#ifndef linux
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#define __BYTE_ORDER BYTE_ORDER
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#define __BIG_ENDIAN BIG_ENDIAN
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#define __LITTLE_ENDIAN LITTLE_ENDIAN
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#else
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#include <endian.h>
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#endif
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#include "squashfs_fs.h"
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#include "error.h"
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#define CALCULATE_HASH(start) (start & 0xffff)
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/*
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* Unified superblock containing fields for all superblocks
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*/
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struct super_block {
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struct squashfs_super_block s;
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/* fields only used by squashfs 3 and earlier layouts */
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unsigned int no_uids;
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unsigned int no_guids;
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long long uid_start;
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long long guid_start;
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};
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struct hash_table_entry {
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long long start;
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long long bytes;
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struct hash_table_entry *next;
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};
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struct inode {
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int blocks;
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char *block_ptr;
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long long data;
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int fragment;
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int frag_bytes;
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gid_t gid;
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int inode_number;
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int mode;
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int offset;
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long long start;
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char *symlink;
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time_t time;
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int type;
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uid_t uid;
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char sparse;
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unsigned int xattr;
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};
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typedef struct squashfs_operations {
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struct dir *(*opendir)(unsigned int block_start,
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unsigned int offset, struct inode **i);
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void (*read_fragment)(unsigned int fragment, long long *start_block,
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int *size);
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void (*read_block_list)(unsigned int *block_list, char *block_ptr,
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int blocks);
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struct inode *(*read_inode)(unsigned int start_block,
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unsigned int offset);
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} squashfs_operations;
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struct test {
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int mask;
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int value;
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int position;
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char mode;
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};
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/* Cache status struct. Caches are used to keep
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track of memory buffers passed between different threads */
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struct cache {
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int max_buffers;
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int count;
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int used;
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int buffer_size;
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int wait_free;
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int wait_pending;
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pthread_mutex_t mutex;
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pthread_cond_t wait_for_free;
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pthread_cond_t wait_for_pending;
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struct cache_entry *free_list;
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struct cache_entry *hash_table[65536];
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};
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/* struct describing a cache entry passed between threads */
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struct cache_entry {
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struct cache *cache;
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long long block;
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int size;
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int used;
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int error;
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int pending;
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struct cache_entry *hash_next;
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struct cache_entry *hash_prev;
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struct cache_entry *free_next;
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struct cache_entry *free_prev;
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char *data;
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};
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/* struct describing queues used to pass data between threads */
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struct queue {
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int size;
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int readp;
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int writep;
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pthread_mutex_t mutex;
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pthread_cond_t empty;
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pthread_cond_t full;
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void **data;
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};
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/* default size of fragment buffer in Mbytes */
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#define FRAGMENT_BUFFER_DEFAULT 256
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/* default size of data buffer in Mbytes */
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#define DATA_BUFFER_DEFAULT 256
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#define DIR_ENT_SIZE 16
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struct dir_ent {
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char name[SQUASHFS_NAME_LEN + 1];
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unsigned int start_block;
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unsigned int offset;
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unsigned int type;
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};
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struct dir {
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int dir_count;
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int cur_entry;
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unsigned int mode;
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uid_t uid;
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gid_t guid;
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unsigned int mtime;
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unsigned int xattr;
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struct dir_ent *dirs;
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};
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struct file_entry {
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int offset;
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int size;
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struct cache_entry *buffer;
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};
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struct squashfs_file {
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int fd;
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int blocks;
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long long file_size;
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int mode;
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uid_t uid;
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gid_t gid;
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time_t time;
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char *pathname;
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char sparse;
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unsigned int xattr;
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};
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struct path_entry {
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char *name;
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regex_t *preg;
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struct pathname *paths;
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};
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struct pathname {
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int names;
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struct path_entry *name;
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};
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struct pathnames {
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int count;
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struct pathname *path[0];
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};
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#define PATHS_ALLOC_SIZE 10
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/* globals */
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extern struct super_block sBlk;
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extern int swap;
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extern struct hash_table_entry *inode_table_hash[65536],
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*directory_table_hash[65536];
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extern pthread_mutex_t screen_mutex;
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extern int progress_enabled;
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extern int inode_number;
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extern int lookup_type[];
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extern int fd;
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extern int no_xattrs;
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extern struct queue *to_reader, *to_inflate, *to_writer;
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extern struct cache *fragment_cache, *data_cache;
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/* unsquashfs.c */
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extern void *read_inode_table(long long, long long);
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extern void *read_directory_table(long long, long long);
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extern long long lookup_entry(struct hash_table_entry **, long long);
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extern int read_fs_bytes(int fd, long long, int, void *);
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extern int read_block(int, long long, long long *, int, void *);
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extern void enable_progress_bar();
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extern void disable_progress_bar();
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extern void dump_queue(struct queue *);
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extern void dump_cache(struct cache *);
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/* unsquash-1.c */
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extern squashfs_operations *read_filesystem_tables_1();
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/* unsquash-2.c */
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extern squashfs_operations *read_filesystem_tables_2();
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/* unsquash-3.c */
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extern squashfs_operations *read_filesystem_tables_3();
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/* unsquash-4.c */
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extern squashfs_operations *read_filesystem_tables_4();
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/* unsquash-123.c */
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extern int read_ids(int, long long, long long, unsigned int **);
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/* unsquash-34.c */
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extern long long *alloc_index_table(int);
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#endif
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