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/*
* linux/include/linux/hfs_sysdep.h
*
* Copyright (C) 1996-1997 Paul H. Hargrove
* This file may be distributed under the terms of the GNU General Public License.
*
* This file contains constants, types and inline
* functions for various system dependent things.
*
* "XXX" in a comment is a note to myself to consider changing something.
*
* In function preconditions the term "valid" applied to a pointer to
* a structure means that the pointer is non-NULL and the structure it
* points to has all fields initialized to consistent values.
*/
#ifndef _HFS_SYSDEP_H
#define _HFS_SYSDEP_H
#include <linux/types.h>
#include <linux/fs.h>
#include <endian.h>
#include <byteswap.h>
#include <asm/unaligned.h>
#undef offsetof
#define offsetof(TYPE, MEMB) ((size_t) &((TYPE *)0)->MEMB)
/* Typedefs for integer types by size and signedness */
typedef __u8 hfs_u8;
typedef __u16 hfs_u16;
typedef __u32 hfs_u32;
typedef __s8 hfs_s8;
typedef __s16 hfs_s16;
typedef __s32 hfs_s32;
/* Typedefs for unaligned integer types */
typedef unsigned char hfs_byte_t;
typedef unsigned char hfs_word_t[2];
typedef unsigned char hfs_lword_t[4];
/*
* HFS structures have fields aligned to 16-bit boundaries.
* So, 16-bit get/put are easy while 32-bit get/put need
* some care on architectures like the DEC Alpha.
*
* In what follows:
* ns = 16-bit integer in network byte-order w/ 16-bit alignment
* hs = 16-bit integer in host byte-order w/ 16-bit alignment
* nl = 32-bit integer in network byte-order w/ unknown alignment
* hl = 32-bit integer in host byte-order w/ unknown alignment
* anl = 32-bit integer in network byte-order w/ 32-bit alignment
* ahl = 32-bit integer in host byte-order w/ 32-bit alignment
* Example: hfs_get_hl() gets an unaligned 32-bit integer converting
* it to host byte-order.
*/
#define hfs_get_hs(addr) ntohs(*((hfs_u16 *)(addr)))
#define hfs_get_ns(addr) (*((hfs_u16 *)(addr)))
#define hfs_get_hl(addr) ntohl(get_unaligned((hfs_u32 *)(addr)))
#define hfs_get_nl(addr) get_unaligned((hfs_u32 *)(addr))
#define hfs_get_ahl(addr) ntohl(*((hfs_u32 *)(addr)))
#define hfs_get_anl(addr) (*((hfs_u32 *)(addr)))
#define hfs_put_hs(val, addr) ((void)(*((hfs_u16 *)(addr)) = ntohs(val)))
#define hfs_put_ns(val, addr) ((void)(*((hfs_u16 *)(addr)) = (val)))
#define hfs_put_hl(val, addr) put_unaligned(htonl(val), (hfs_u32 *)(addr))
#define hfs_put_nl(val, addr) put_unaligned((val), (hfs_u32 *)(addr))
#define hfs_put_ahl(val, addr) ((void)(*((hfs_u32 *)(addr)) = ntohl(val)))
#define hfs_put_anl(val, addr) ((void)(*((hfs_u32 *)(addr)) = (val)))
#endif
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