TVirtualDiskVpcExtent

`constructor Create(AImage:TVirtualDiskImage; ADelta,AParent:TVirtualDiskExtent);`
`destructor Destroy; override;`
private
`FHeader:PVpcHardDiskFooter;`
`FFooter:PVpcHardDiskFooter;`
`FSparse:PVpcDynamicDiskHeader;`

`FHeaderOffset:Int64;`	Absolute byte offset of Header in file
`FHeaderSize:LongWord;`	Size of Header in image

`FFooterOffset:Int64;`	Absolute byte offset of Footer in file
`FFooterSize:LongWord;`	Size of Footer in image

`FSparseOffset:Int64;`	Absolute byte offset of Dynamic Header in file
`FSparseSize:LongWord;`	Size of Dynamic Header in image
protected
`FTable:TVirtualDiskVpcTable;`	VirtualPC images contain only one Table per Extent
`FGroups:TFileSysList;`	Block bitmap Groups
`FGroupLocal:TMutexHandle;`	Local Lock shared by all Block bitmap Groups
public
`property Header:PVpcHardDiskFooter read FHeader;`
`property Footer:PVpcHardDiskFooter read FFooter;`
`property Sparse:PVpcDynamicDiskHeader read FSparse;`
`property Table:TVirtualDiskVpcTable read FTable;`
`property Groups:TFileSysList read FGroups;`

`property HeaderOffset:Int64 read FHeaderOffset write FHeaderOffset;`
`property HeaderSize:LongWord read FHeaderSize write FHeaderSize;`

`property FooterOffset:Int64 read FFooterOffset write FFooterOffset;`
`property FooterSize:LongWord read FFooterSize write FFooterSize;`

`property SparseOffset:Int64 read FSparseOffset write FSparseOffset;`
`property SparseSize:LongWord read FSparseSize write FSparseSize;`

`function HasFooter:Boolean;`

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