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243 lines
4.0 KiB
243 lines
4.0 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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easet.hxx
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Abstract:
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This class models an EA set.
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Author:
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Norbert P. Kusters (norbertk) 28-Nov-90
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Notes:
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There are minor alignment problems here.
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--*/
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#if !defined(EA_SET_DEFN)
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#define EA_SET_DEFN
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#include "cluster.hxx"
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#if defined ( _AUTOCHECK_ )
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#define UFAT_EXPORT
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#elif defined ( _UFAT_MEMBER_ )
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#define UFAT_EXPORT __declspec(dllexport)
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#else
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#define UFAT_EXPORT __declspec(dllimport)
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#endif
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//
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// Forward references
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//
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DECLARE_CLASS( EA_SET );
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DECLARE_CLASS( FAT );
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DECLARE_CLASS( FAT_SA );
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DECLARE_CLASS( LOG_IO_DP_DRIVE );
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DECLARE_CLASS( MEM );
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struct _EA_HDR {
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USHORT Signature;
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USHORT OwnHandle;
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ULONG NeedCount;
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UCHAR OwnerFileName[14];
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ULONG Reserved;
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LONG TotalSize;
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};
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DEFINE_TYPE( struct _EA_HDR, EA_HDR );
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struct _PACKED_EA_HDR {
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USHORT Signature;
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USHORT OwnHandle;
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ULONG NeedCount;
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UCHAR OwnerFileName[14];
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UCHAR Reserved[4];
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UCHAR TotalSize[4];
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};
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DEFINE_TYPE( struct _PACKED_EA_HDR, PACKED_EA_HDR );
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const SizeOfEaHdr = 30; // sizeof returns 32.
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struct _EA {
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UCHAR Flag;
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UCHAR NameSize;
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UCHAR ValueSize[2]; // Was USHORT.
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CHAR Name[1];
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};
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DEFINE_TYPE( struct _EA, EA );
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CONST USHORT EaSetSignature = 0x4145;
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CONST UCHAR NeedFlag = 0x80;
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class EA_SET : public CLUSTER_CHAIN {
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public:
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UFAT_EXPORT
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DECLARE_CONSTRUCTOR( EA_SET );
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VIRTUAL
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UFAT_EXPORT
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~EA_SET(
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);
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NONVIRTUAL
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UFAT_EXPORT
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BOOLEAN
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Initialize(
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IN OUT PMEM Mem,
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IN OUT PLOG_IO_DP_DRIVE Drive,
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IN PFAT_SA FatSuperArea,
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IN PCFAT Fat,
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IN ULONG ClusterNumber,
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IN ULONG LengthOfChain DEFAULT 0
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);
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NONVIRTUAL
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UFAT_EXPORT
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BOOLEAN
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Read(
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);
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NONVIRTUAL
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BOOLEAN
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Write(
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);
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NONVIRTUAL
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PEA_HDR
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GetEaSetHeader(
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);
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NONVIRTUAL
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UFAT_EXPORT
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PEA
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GetEa(
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IN ULONG Index,
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OUT PLONG EaSize DEFAULT NULL,
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OUT PBOOLEAN PossiblyMore DEFAULT NULL
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);
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NONVIRTUAL
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BOOLEAN
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VerifySignature(
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) CONST;
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private:
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NONVIRTUAL
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VOID
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Construct(
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);
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NONVIRTUAL
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VOID
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Destroy(
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);
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NONVIRTUAL
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BOOLEAN
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PackEaHeader(
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);
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NONVIRTUAL
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BOOLEAN
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UnPackEaHeader(
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);
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EA_HDR _eahdr;
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LONG _size;
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BOOLEAN _size_imposed;
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PEA _current_ea;
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ULONG _current_index;
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};
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INLINE
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BOOLEAN
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EA_SET::Write(
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)
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/*++
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Routine Description:
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This routine packs the ea header and then writes the cluster chain to disk.
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Arguments:
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None.
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Return Value:
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FALSE - Failure.
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TRUE - Success.
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--*/
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{
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return PackEaHeader() && CLUSTER_CHAIN::Write();
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}
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INLINE
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PEA_HDR
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EA_SET::GetEaSetHeader(
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)
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/*++
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Routine Description:
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This routine returns a pointer to the unpacked ea set header.
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Arguments:
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None.
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Return Value:
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A pointer to the unpacked ea set header.
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--*/
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{
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return &_eahdr;
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}
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INLINE
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BOOLEAN
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EA_SET::VerifySignature(
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) CONST
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/*++
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Routine Description:
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This routine verifies the signature on the EA set.
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Arguments:
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None.
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Return Value:
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FALSE - The signature is invalid.
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TRUE - The signature is valid.
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--*/
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{
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return _eahdr.Signature == EaSetSignature;
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}
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#endif // EA_SET_DEFN
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