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/*
* Copyright (c) 2012 Dave Vasilevsky <dave@vasilevsky.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SQFS_COMMON_H
#define SQFS_COMMON_H
#include "config.h"
#include <stdbool.h>
#include <stdint.h>
#include <sys/types.h>
#ifdef _WIN32
# include <win32.h>
# include <intrin.h>
# define atomic_inc_relaxed(ptr) \
_InterlockedIncrement(ptr)
# define atomic_dec_acqrel(ptr) \
_InterlockedDecrement(ptr)
#else
typedef mode_t sqfs_mode_t;
typedef uid_t sqfs_id_t;
typedef off_t sqfs_off_t;
typedef int sqfs_fd_t;
# define atomic_inc_relaxed(ptr) \
__atomic_add_fetch(&block->refcount, 1, __ATOMIC_RELAXED)
# define atomic_dec_acqrel(ptr) \
__atomic_sub_fetch(&block->refcount, 1, __ATOMIC_ACQ_REL)
#endif
typedef enum {
SQFS_OK,
SQFS_ERR,
SQFS_BADFORMAT, /* unsupported file format */
SQFS_BADVERSION, /* unsupported squashfs version */
SQFS_BADCOMP, /* unsupported compression method */
SQFS_UNSUP /* unsupported feature */
} sqfs_err;
#define SQFS_INODE_ID_BYTES 6
typedef uint64_t sqfs_inode_id;
typedef uint32_t sqfs_inode_num;
typedef struct sqfs sqfs;
typedef struct sqfs_inode sqfs_inode;
typedef struct {
size_t size;
void *data;
long refcount;
} sqfs_block;
typedef struct {
sqfs_off_t block;
size_t offset;
} sqfs_md_cursor;
/* Increment the refcount on the block. */
static inline void sqfs_block_ref(sqfs_block *block) {
atomic_inc_relaxed(&block->refcount);
}
/* decrement the refcount on the block, return non-zero if we held the last
* reference.
*/
static inline int sqfs_block_deref(sqfs_block *block) {
return atomic_dec_acqrel(&block->refcount) == 0;
}
#endif
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