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/*++
Copyright (c) 1989-2000 Microsoft Corporation
Module Name:
Lfn.h
Abstract:
This module defines the on-disk structure of long file names on FAT.
--*/
#ifndef _LFN_
#define _LFN_
//
// This strucure defines the on disk format on long file name dirents.
//
typedef struct _PACKED_LFN_DIRENT {
UCHAR Ordinal; // offset = 0
UCHAR Name1[10]; // offset = 1 (Really 5 chars, but not WCHAR aligned)
UCHAR Attributes; // offset = 11
UCHAR Type; // offset = 12
UCHAR Checksum; // offset = 13
WCHAR Name2[6]; // offset = 14
USHORT MustBeZero; // offset = 26
WCHAR Name3[2]; // offset = 28
} PACKED_LFN_DIRENT; // sizeof = 32
typedef PACKED_LFN_DIRENT *PPACKED_LFN_DIRENT;
#define FAT_LAST_LONG_ENTRY 0x40 // Ordinal field
#define FAT_LONG_NAME_COMP 0x0 // Type field
//
// A packed lfn dirent is already quadword aligned so simply declare a
// lfn dirent as a packed lfn dirent.
//
typedef PACKED_LFN_DIRENT LFN_DIRENT;
typedef LFN_DIRENT *PLFN_DIRENT;
//
// This is the largest size buffer we would ever need to read an Lfn
//
#define MAX_LFN_CHARACTERS 260
#define MAX_LFN_DIRENTS 20
#define FAT_LFN_DIRENTS_NEEDED(NAME) (((NAME)->Length/sizeof(WCHAR) + 12)/13)
#endif // _LFN_
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