|
Server : Apache/2.2.2 (Fedora) System : Linux App1.pathumtani.go.th 2.6.20-1.2320.fc5smp #1 SMP Tue Jun 12 19:40:16 EDT 2007 i686 User : apache ( 48) PHP Version : 5.2.9 Disable Function : NONE Directory : /proc/self/root/usr/include/linux/ |
Upload File : |
/* * 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