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229 lines
3.9 KiB
229 lines
3.9 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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eaheader.hxx
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Abstract:
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This class models the header and tables of the EA file.
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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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Luckily all the structures are well aligned.
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--*/
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#if !defined(EA_HEADER_DEFN)
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#define EA_HEADER_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_HEADER );
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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_FILE_HEADER {
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USHORT Signature;
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USHORT FormatType;
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USHORT LogType;
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USHORT Cluster1;
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USHORT NewCValue1;
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USHORT Cluster2;
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USHORT NewCValue2;
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USHORT Cluster3;
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USHORT NewCValue3;
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USHORT Handle;
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USHORT NewHOffset;
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UCHAR Reserved[10];
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};
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DEFINE_TYPE( struct _EA_FILE_HEADER, EA_FILE_HEADER );
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CONST BaseTableSize = 240;
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struct _EA_MAP_TBL {
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USHORT BaseTab[BaseTableSize];
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USHORT OffTab[1];
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};
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DEFINE_TYPE( struct _EA_MAP_TBL, EA_MAP_TBL );
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struct _EA_HEADER_AND_TABLE {
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EA_FILE_HEADER Header;
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EA_MAP_TBL Table;
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};
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DEFINE_TYPE( struct _EA_HEADER_AND_TABLE, EA_HEADER_AND_TABLE );
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CONST USHORT HeaderSignature = 0x4445;
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CONST USHORT CurrentFormatType = 0;
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CONST USHORT CurrentLogType = 0;
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CONST USHORT Bit15 = 0x8000;
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CONST USHORT InvalidHandle = 0xFFFF;
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class EA_HEADER : public CLUSTER_CHAIN {
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public:
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UFAT_EXPORT
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DECLARE_CONSTRUCTOR( EA_HEADER );
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VIRTUAL
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UFAT_EXPORT
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~EA_HEADER(
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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 StartingCluster,
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IN ULONG LengthOfChain DEFAULT 0
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);
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NONVIRTUAL
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PEA_FILE_HEADER
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GetEaFileHeader(
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);
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NONVIRTUAL
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PEA_MAP_TBL
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GetMapTable(
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);
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NONVIRTUAL
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LONG
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QueryOffTabSize(
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) CONST;
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NONVIRTUAL
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UFAT_EXPORT
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USHORT
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QueryEaSetClusterNumber(
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IN USHORT Handle
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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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PEA_HEADER_AND_TABLE _ht;
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LONG _off_tab_size;
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};
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INLINE
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PEA_FILE_HEADER
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EA_HEADER::GetEaFileHeader(
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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 EA file header. Dereferencing
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this pointer will allow the client to examine and modify the
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EA file header. These changes will take effect on disk when the
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client issues a 'Write' command.
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Arguments:
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None.
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Return Value:
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A pointer to the EA file header.
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--*/
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{
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return _ht ? &_ht->Header : NULL;
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}
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INLINE
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PEA_MAP_TBL
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EA_HEADER::GetMapTable(
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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 EA mapping table. Dereferencing
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this pointer will allow the client to examine and modify the
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EA mapping table. These changes will take effect on disk when the
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client issues a 'Write' command.
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Arguments:
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None.
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Return Value:
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A pointer to the EA mapping table.
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--*/
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{
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return _ht ? &_ht->Table : NULL;
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}
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INLINE
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LONG
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EA_HEADER::QueryOffTabSize(
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) CONST
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/*++
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Routine Description:
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Computes the number of entries in the offset table.
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Arguments:
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None.
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Return Value:
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Returns the number of entries in the offset table.
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--*/
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{
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return _off_tab_size;
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}
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#endif // EA_HEADER_DEFN
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