TVirtualDiskExtent

Return to Unit VirtualDisk

Note: Represents an Extent (usually a file) forming part of a virtual disk

`constructor Create(AImage:TVirtualDiskImage; ADelta,AParent:TVirtualDiskExtent);`
`destructor Destroy; override;`
private
`FLock:TMutexHandle;`
protected
`FImage:TVirtualDiskImage;`
`FDelta:TVirtualDiskExtent;`
`FParent:TVirtualDiskExtent;`

`FFlags:LongWord;`

`FFilename:String;`	Filename of the file backing this Extent
`FHandle:THandle;`	DiskDriver Handle to the file of this Extent

`FDataOffset:Int64;`	Absolute byte offset of Data in file (Where Applicable)
`FBlockSize:LongWord;`	Size of each data block in file

`FStartSector:Int64;`	First Sector contained by this Extent
`FSectorCount:Int64;`	Number of Sectors contained by this Extent

`FBlockShiftCount:LongWord;`	Sector to Block Shift Count

`function GetFilename:String;`
`procedure SetFilename(const AFilename:String);`

`function GetBlockShiftCount:LongWord; virtual;`
public
`property Image:TVirtualDiskImage read FImage;`
`property Delta:TVirtualDiskExtent read FDelta write FDelta;`
`property Parent:TVirtualDiskExtent read FParent write FParent;`

`property Flags:LongWord read FFlags write FFlags;`

`property Filename:String read GetFilename write SetFilename;`
`property Handle:THandle read FHandle write FHandle;`

`property DataOffset:Int64 read FDataOffset write FDataOffset;`
`property BlockSize:LongWord read FBlockSize write FBlockSize;`

`property StartSector:Int64 read FStartSector write FStartSector;`
`property SectorCount:Int64 read FSectorCount write FSectorCount;`

`property BlockShiftCount:LongWord read FBlockShiftCount write FBlockShiftCount;`

`function AcquireLock:Boolean;`
`function ReleaseLock:Boolean;`

`function IsFixed:Boolean; virtual;`
`function IsDynamic:Boolean; virtual;`

`function IsBase:Boolean; virtual;`
`function IsDelta:Boolean; virtual;`

`function IsDevice:Boolean; virtual;`

`function HasDelta:Boolean; virtual;`