Difference between revisions of "TVirtualDiskVpcImage"

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Latest revision as of 05:56, 1 June 2018

Return to Unit VirtualDisk


Description

To be documented

Class definitions


TVirtualDiskVpcImage = class(TVirtualDiskImage)

constructor Create(ADriver:TFileSysDriver; AController:TDiskController; const AName:String; AImageNo:Integer);  
destructor Destroy; override;  
private
function GetAttributes:LongWord;  
 
function ChecksumFooter(AFooter:PVpcHardDiskFooter):LongWord;  
function ChecksumSparse(ASparse:PVpcDynamicDiskHeader):LongWord;  
 
function RoundToSector(AValue:LongWord;ASectorSize:Word):LongWord;  
protected
function GetReady:Boolean; override;  
 
function GetCylinders:LongWord; override;  
function GetHeads:LongWord; override;  
function GetSectors:LongWord; override;  
 
function GetSectorSize:Word; override;  
function GetSectorCount:Int64; override;  
 
function ReadExtent(AExtent:TVirtualDiskExtent; ASector:LongWord; ACount:Word; var ABuffer):Word; override;  
function WriteExtent(AExtent:TVirtualDiskExtent; ASector:LongWord; ACount:Word; const ABuffer):Word; override;  
 
function LoadExtents:Boolean; override;  
 
function CheckExtent(ADelta,AParent:TVirtualDiskExtent; const AFilename:String):Boolean; override;  
function LoadExtent(ADelta,AParent:TVirtualDiskExtent; const AFilename:String):TVirtualDiskExtent; override;  
 
function AddExtent(AParent:TVirtualDiskExtent; const AFilename:String):TVirtualDiskExtent; override;  
 
function SetExtent(AExtent:TVirtualDiskExtent):Boolean; override;  
function GetExtent(const ASector:Int64; AWrite,ALock:Boolean):TVirtualDiskExtent; override;  
 
function LoadTables:Boolean; override;  
 
function LoadTable(AExtent:TVirtualDiskExtent; ATableNo:LongWord):TVirtualDiskTable; override;  
 
function AddTable(AExtent:TVirtualDiskExtent):TVirtualDiskTable; override;  
 
function SetTable(ATable:TVirtualDiskTable):Boolean; override;  
 
function LoadBlocks(ATable:TVirtualDiskTable):Boolean; override;  
 
function LoadBlock(ATable:TVirtualDiskTable; ABlockNo:LongWord):TVirtualDiskBlock; override;  
 
function AddBlock(ATable:TVirtualDiskTable):TVirtualDiskBlock; override;  
 
function SetBlock(ABlock:TVirtualDiskBlock):Boolean; override;  
function GetBlock(ATable:TVirtualDiskTable; const ASector:Int64; AWrite:Boolean):TVirtualDiskBlock; override;  
 
function TestBlock(ABlock:TVirtualDiskBlock; const ASector:Int64; ACount:LongWord; AUsed:Boolean):LongWord;  
function MarkBlock(ABlock:TVirtualDiskBlock; const ASector:Int64; ACount:LongWord; AUsed:Boolean):Boolean;  
 
function TestBitmap(ABuffer:Pointer; ASize,AStart,ACount:LongWord; AUsed:Boolean):LongWord;  
function MarkBitmap(ABuffer:Pointer; ASize,AStart,ACount:LongWord; AUsed:Boolean):Boolean;  
 
function LocateDelta(AExtent:TVirtualDiskExtent):String; override;  
function LocateParent(AExtent:TVirtualDiskExtent):String; override;  
function LocateSibling(AExtent:TVirtualDiskExtent):String; override;  
public
function ImageInit:Boolean; override;  
 
function Read(ASector:LongWord; ACount:Word; var ABuffer):Boolean; override;  
function Write(ASector:LongWord; ACount:Word; const ABuffer):Boolean; override;  
function Allocated(ASector:LongWord; ACount:Word):Word; override;  
 
function CreateImage(AMediaType:TMediaType; AFloppyType:TFloppyType; AAttributes:LongWord; ASectorSize:Word; const ASectorCount:Int64; ACylinders,AHeads,ASectors:LongWord; APartitionId:Byte):Integer; override;  
function OpenImage(AMediaType:TMediaType; AFloppyType:TFloppyType; AAttributes:LongWord; ASectorSize:Word; const ASectorCount:Int64; ACylinders,AHeads,ASectors:LongWord; APartitionId:Byte):Integer; override;  
function CloseImage:Boolean; override;  
function ResizeImage(const ASectorCount:Int64):Boolean; override;  
 
function CreateSnapshot:Boolean; override;  
function DeleteSnapshot:Boolean; override;  
function MergeSnapshot:Boolean; override;  


Function declarations


constructor TVirtualDiskVpcImage.Create(ADriver:TFileSysDriver; AController:TDiskController; const AName:String; AImageNo:Integer);
Description: To be documented
Note None documented 


destructor TVirtualDiskVpcImage.Destroy;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetAttributes:LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.ChecksumFooter(AFooter:PVpcHardDiskFooter):LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.ChecksumSparse(ASparse:PVpcDynamicDiskHeader):LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.RoundToSector(AValue:LongWord; ASectorSize:Word):LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetReady:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetCylinders:LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetHeads:LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetSectors:LongWord;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetSectorSize:Word;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.GetSectorCount:Int64;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.ReadExtent(AExtent:TVirtualDiskExtent; ASector:LongWord; ACount:Word; var ABuffer):Word;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.WriteExtent(AExtent:TVirtualDiskExtent; ASector:LongWord; ACount:Word; const ABuffer):Word;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.LoadExtents:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.CheckExtent(ADelta,AParent:TVirtualDiskExtent; const AFilename:String):Boolean;
Description: Check that the passed file is a valid VirtualPC extent
Note If delta is provided, check that passed file is the parent of the delta.

If parent is provided, check that passed file is the delta of the parent.
Caller must hold the delta and parent locks 


function TVirtualDiskVpcImage.LoadExtent(ADelta,AParent:TVirtualDiskExtent; const AFilename:String):TVirtualDiskExtent;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.AddExtent(AParent:TVirtualDiskExtent; const AFilename:String):TVirtualDiskExtent;
Description: To be documented
Note Caller must hold the parent lock 


function TVirtualDiskVpcImage.SetExtent(AExtent:TVirtualDiskExtent):Boolean;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.GetExtent(const ASector:Int64; AWrite,ALock:Boolean):TVirtualDiskExtent;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.LoadTables:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.LoadTable(AExtent:TVirtualDiskExtent; ATableNo:LongWord):TVirtualDiskTable;
Description: To be documented
Note Caller must hold the extent tables writer lock 


function TVirtualDiskVpcImage.AddTable(AExtent:TVirtualDiskExtent):TVirtualDiskTable;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.SetTable(ATable:TVirtualDiskTable):Boolean;
Description: To be documented
Note Caller must hold the table extent lock 


function TVirtualDiskVpcImage.LoadBlocks(ATable:TVirtualDiskTable):Boolean;
Description: To be documented
Note Caller must hold the extent tables writer lock 


function TVirtualDiskVpcImage.LoadBlock(ATable:TVirtualDiskTable; ABlockNo:LongWord):TVirtualDiskBlock;
Description: To be documented
Note Caller must hold the extent tables writer lock 


function TVirtualDiskVpcImage.AddBlock(ATable:TVirtualDiskTable):TVirtualDiskBlock;
Description: To be documented
Note Caller must hold the table extent lock 


function TVirtualDiskVpcImage.SetBlock(ABlock:TVirtualDiskBlock):Boolean;
Description: To be documented
Note Caller must hold the block table extent lock 


function TVirtualDiskVpcImage.GetBlock(ATable:TVirtualDiskTable; const ASector:Int64; AWrite:Boolean):TVirtualDiskBlock;
Description: To be documented
Write The Write parameter is ignored for Block lookups
Note Caller must hold the table extent lock 


function TVirtualDiskVpcImage.TestBlock(ABlock:TVirtualDiskBlock; const ASector:Int64; ACount:LongWord; AUsed:Boolean):LongWord;
Description: Test Count sectors from Sector in the Block bitmap for Free or Used
Sector Sector is the sector number in the block to start from

Sector must be greater than or equal to block start sector

Note Caller must hold the block table extent lock 


function TVirtualDiskVpcImage.MarkBlock(ABlock:TVirtualDiskBlock; const ASector:Int64; ACount:LongWord; AUsed:Boolean):Boolean;
Description: Mark Count sectors from Sector in the Block bitmap as Free or Used
Sector Sector is the sector number in the block to start from

Sector must be greater than or equal to block start sector

Note Caller must hold the block table extent lock 


function TVirtualDiskVpcImage.TestBitmap(ABuffer:Pointer; ASize,AStart,ACount:LongWord; AUsed:Boolean):LongWord;
Description: Test Count bits from Start in the Block bitmap for Free or Used
Size Size is the total number of bits in the bitmap
Start Start is the bit number in the bitmap to start from
Count Count is the number of bits in the bitmap to be tested
Note Should only be called by TestBlock

Bitmaps use 32 bit blocks in big endian order 


function TVirtualDiskVpcImage.MarkBitmap(ABuffer:Pointer; ASize,AStart,ACount:LongWord; AUsed:Boolean):Boolean;
Description: Mark Count bits from Start in the Block bitmap as Free or Used
Size Size is the total number of bits in the bitmap
Start Start is the bit number in the bitmap to start from
Count Count is the number of bits in the bitmap to be marked
Note Should only be called by MarkBlock

Bitmaps use 32 bit blocks in big endian order 


function TVirtualDiskVpcImage.LocateDelta(AExtent:TVirtualDiskExtent):String;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.LocateParent(AExtent:TVirtualDiskExtent):String;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.LocateSibling(AExtent:TVirtualDiskExtent):String;
Description: To be documented
Note Caller must hold the extent lock 


function TVirtualDiskVpcImage.ImageInit:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.Read(ASector:LongWord; ACount:Word; var ABuffer):Boolean;
Description: To be documented
Note Caller must hold the image lock 


function TVirtualDiskVpcImage.Write(ASector:LongWord; ACount:Word; const ABuffer):Boolean;
Description: To be documented
Note Caller must hold the image lock 


function TVirtualDiskVpcImage.Allocated(ASector:LongWord; ACount:Word):Word;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.CreateImage(AMediaType:TMediaType; AFloppyType:TFloppyType; AAttributes:LongWord; ASectorSize:Word; const ASectorCount:Int64; ACylinders,AHeads,ASectors:LongWord; APartitionId:Byte):Integer;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.OpenImage(AMediaType:TMediaType; AFloppyType:TFloppyType; AAttributes:LongWord; ASectorSize:Word; const ASectorCount:Int64; ACylinders,AHeads,ASectors:LongWord; APartitionId:Byte):Integer;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.CloseImage:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.ResizeImage(const ASectorCount:Int64):Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.CreateSnapshot:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.DeleteSnapshot:Boolean;
Description: To be documented
Note None documented 


function TVirtualDiskVpcImage.MergeSnapshot:Boolean;
Description: To be documented
Note None documented


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