ntfsendian.h

一个linux下NTFS文件格式源代码

/*
 *  ntfsendian.h
 *
 *  Copyright (C) 1998, 1999 Martin von L鰓is
 *  Copyright (C) 1998 Joseph Malicki
 *  Copyright (C) 1999 Werner Seiler
 */

#ifdef __linux__
/* This defines __cpu_to_le16 on Linux 2.1 and higher. */
#include <asm/byteorder.h>
#endif

#ifdef __cpu_to_le16
#define CPU_TO_LE16(a) __cpu_to_le16(a)
#define CPU_TO_LE32(a) __cpu_to_le32(a)
#define CPU_TO_LE64(a) __cpu_to_le64(a)

#define LE16_TO_CPU(a) __cpu_to_le16(a)
#define LE32_TO_CPU(a) __cpu_to_le32(a)
#define LE64_TO_CPU(a) __cpu_to_le64(a)

#else

#ifdef __LITTLE_ENDIAN

#define CPU_TO_LE16(a) (a)
#define CPU_TO_LE32(a) (a)
#define CPU_TO_LE64(a) (a)
#define LE16_TO_CPU(a) (a)
#define LE32_TO_CPU(a) (a)
#define LE64_TO_CPU(a) (a)

#else

/* Routines for big-endian machines */
#ifdef __BIG_ENDIAN

/* We hope its big-endian, not PDP-endian :) */
#define CPU_TO_LE16(a) ((((a)&0xFF) << 8)|((a) >> 8))
#define CPU_TO_LE32(a) ((((a) & 0xFF) << 24) | (((a) & 0xFF00) << 8) | \
			(((a) & 0xFF0000) >> 8) | ((a) >> 24))
#define CPU_TO_LE64(a) ((CPU_TO_LE32(a)<<32)|CPU_TO_LE32((a)>>32)

#define LE16_TO_CPU(a) CPU_TO_LE16(a)
#define LE32_TO_CPU(a) CPU_TO_LE32(a)
#define LE64_TO_CPU(a) CPU_TO_LE64(a)

#else

#error Please define Endianness - __BIG_ENDIAN or __LITTLE_ENDIAN or add OS-specific macros

#endif /* __BIG_ENDIAN */
#endif /* __LITTLE_ENDIAN */
#endif /* __cpu_to_le16 */

#define NTFS_GETU8(p)      (*(ntfs_u8*)(p))
#define NTFS_GETU16(p)     ((ntfs_u16)LE16_TO_CPU(*(ntfs_u16*)(p)))
#define NTFS_GETU24(p)     ((ntfs_u32)NTFS_GETU16(p) | ((ntfs_u32)NTFS_GETU8(((char*)(p))+2)<<16))
#define NTFS_GETU32(p)     ((ntfs_u32)LE32_TO_CPU(*(ntfs_u32*)(p)))
#define NTFS_GETU40(p)     ((ntfs_u64)NTFS_GETU32(p)|(((ntfs_u64)NTFS_GETU8(((char*)(p))+4))<<32))
#define NTFS_GETU48(p)     ((ntfs_u64)NTFS_GETU32(p)|(((ntfs_u64)NTFS_GETU16(((char*)(p))+4))<<32))
#define NTFS_GETU56(p)     ((ntfs_u64)NTFS_GETU32(p)|(((ntfs_u64)NTFS_GETU24(((char*)(p))+4))<<32))
#define NTFS_GETU64(p)     ((ntfs_u64)LE64_TO_CPU(*(ntfs_u64*)(p)))
 
 /* Macros writing unsigned integers */
#define NTFS_PUTU8(p,v)      ((*(ntfs_u8*)(p))=(v))
#define NTFS_PUTU16(p,v)     ((*(ntfs_u16*)(p))=CPU_TO_LE16(v))
#define NTFS_PUTU24(p,v)     NTFS_PUTU16(p,(v) & 0xFFFF);\
                             NTFS_PUTU8(((char*)(p))+2,(v)>>16)
#define NTFS_PUTU32(p,v)     ((*(ntfs_u32*)(p))=CPU_TO_LE32(v))
#define NTFS_PUTU64(p,v)     ((*(ntfs_u64*)(p))=CPU_TO_LE64(v))
 
 /* Macros reading signed integers */
#define NTFS_GETS8(p)        ((*(ntfs_s8*)(p)))
#define NTFS_GETS16(p)       ((ntfs_s16)LE16_TO_CPU(*(short*)(p)))
#define NTFS_GETS24(p)       (NTFS_GETU24(p) < 0x800000 ? (int)NTFS_GETU24(p) : (int)(NTFS_GETU24(p) - 0x1000000))
#define NTFS_GETS32(p)       ((ntfs_s32)LE32_TO_CPU(*(int*)(p)))
#define NTFS_GETS40(p)       (((ntfs_s64)NTFS_GETU32(p)) | (((ntfs_s64)NTFS_GETS8(((char*)(p))+4)) << 32))
#define NTFS_GETS48(p)       (((ntfs_s64)NTFS_GETU32(p)) | (((ntfs_s64)NTFS_GETS16(((char*)(p))+4)) << 32))
#define NTFS_GETS56(p)       (((ntfs_s64)NTFS_GETU32(p)) | (((ntfs_s64)NTFS_GETS24(((char*)(p))+4)) << 32))
#define NTFS_GETS64(p)	     ((ntfs_s64)NTFS_GETU64(p))
 
#define NTFS_PUTS8(p,v)      NTFS_PUTU8(p,v)
#define NTFS_PUTS16(p,v)     NTFS_PUTU16(p,v)
#define NTFS_PUTS24(p,v)     NTFS_PUTU24(p,v)
#define NTFS_PUTS32(p,v)     NTFS_PUTU32(p,v)