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| | </div></div> | | </div></div> |
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| − | '''Microsoft virtual PC dynaic disk header''' | + | '''Microsoft virtual PC dynamic disk header''' |
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| | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;"> | | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;"> |
Revision as of 00:15, 8 March 2017
Return to Unit Reference
Description
Ultibo Virtual Disk interface unit
To be documented
Constants
[Expand]
Virtual disk specific constants VIRTUAL_*
VIRTUAL_DEVICE_DESCRIPTION = 'Virtual Disk Device';
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VIRTUAL_CONTROLLER_DESCRIPTION = 'Virtual Disk Controller';
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[Expand]
Virtual flag contants virtualFlag*
virtualFlagNone = $00000000;
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virtualFlagFixed = $00000001;
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virtualFlagDynamic = $00000002;
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virtualFlagBase = $00000004;
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virtualFlagDelta = $00000008;
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virtualFlagDevice = $00000010;
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virtualFlagSplit = $00000020;
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[Expand]
VMware constants vmware*
vmwareFileExtension = '.vmdk';
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vmwareFileMask = '*.vmdk';
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vmwareNoParentCID = $FFFFFFFF;
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not($00000000)
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vmwareSparseMagicNumber = $564d444b;
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'VMDK'
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vmwareEsxSparseMagicNumber = $44574f43;
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'COWD'
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vmwareEsxSparseMaxParentLength = 1024;
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COWDISK_MAX_PARENT_FILELEN
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vmwareEsxSparseMaxNameLength = 60;
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COWDISK_MAX_NAME_LEN
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vmwareEsxSparseMaxDescriptionLength = 512;
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COWDISK_MAX_DESC_LEN
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vmwareSectorSize = 512;
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[Expand]
VMware disk type constants vmware*DiskType
vmwareMaxDiskType = 0;
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vmwareDiskTypeNone = 0;
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[Expand]
VMware descriptor tag constants vmwareTag*
vmwareTagDisk = 'Disk DescriptorFile';
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vmwareTagVersion = 'version';
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vmwareTagCID = 'CID';
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vmwareTagParentCID = 'parentCID';
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vmwareTagCreateType = 'createType';
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vmwareTagExtent = 'Extent Description';
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vmwareTagDatabase = 'The Disk Data Base';
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vmwareTagDDB = 'DDB';
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vmwareTagAdapter = 'ddb.adapterType';
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vmwareTagSectors = 'ddb.geometry.sectors';
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vmwareTagHeads = 'ddb.geometry.heads';
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vmwareTagCylinders = 'ddb.geometry.cylinders';
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vmwareTagParentHint = 'parentFileNameHint';
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[Expand]
VMware create type constants vmwareCreateType_*
vmwareMaxCreateType = 11;
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vmwareCreateType_monolithicSparse = 0;
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vmwareCreateType_vmfsSparse = 1;
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vmwareCreateType_monolithicFlat = 2;
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vmwareCreateType_vmfs = 3;
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vmwareCreateType_twoGbMaxExtentSparse = 4;
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vmwareCreateType_twoGbMaxExtentFlat = 5;
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vmwareCreateType_fullDevice = 6;
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vmwareCreateType_vmfsRaw = 7;
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vmwareCreateType_partitionedDevice = 8;
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vmwareCreateType_vmfsRawDeviceMap = 9;
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vmwareCreateType_vmfsPassthroughRawDeviceMap = 10;
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vmwareCreateType_streamOptimized = 11;
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[Expand]
VMware access type constants vmwareAccessType_*
vmwareMaxAccessType = 2;
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vmwareAccessType_RW = 0;
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vmwareAccessType_RDONLY = 1;
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vmwareAccessType_NOACCESS = 2;
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[Expand]
VMware extent type constants vmwareExtentType_*
vmwareMaxExtentType = 6;
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vmwareExtentType_FLAT = 0;
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vmwareExtentType_SPARSE = 1;
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vmwareExtentType_ZERO = 2;
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vmwareExtentType_VMFS = 3;
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vmwareExtentType_VMFSSPARSE = 4;
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vmwareExtentType_VMFSRDM = 5;
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vmwareExtentType_VMFSRAW = 6;
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[Expand]
VMware disk flag constants vmwareFlag*
vmwareFlagValidTest = $00000001;
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bit 0: valid new line detection test
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vmwareFlagRedundantGrain = $00000002;
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bit 1: redundant grain table will be used
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vmwareFlagGrainCompressed = $00010000;
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bit 16: the grains are compressed. The type of compression is described by compressAlgorithm
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vmwareFlagLBAMarkers = $00020000;
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bit 17: there are markers in the virtual disk to identify every block of metadata or data and the markers for the virtual machine data contain a LBA
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[Expand]
VMware compression type constants vmwareCompression*
vmwareCompressionNone = 0;
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vmwareCompressionDeflate = 1;
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The deflate algorithm is described in RFC 1951
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[Expand]
VPC constants vpc*
vpcFileExtension = '.vhd';
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vpcUndoExtension = '.vud';
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vpcFileMask = '*.vhd';
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vpcUndoMask = '*.vud';
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vpcSplitMask = '*.v??';
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.v01, v02 etc up to 64
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vpcFooterCookie = 'conectix';
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vpcDynamicCookie = 'cxsparse';
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vpcMaxDiskExtents = 64;
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Maximum number of 4GB split files in a disk image
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vpcExtentMaxSize = 4294967296;
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Maximum size of s split file (4GB)
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vpcUnixTimeOffset = 946684800;
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Offset from 1/1/1970 to 1/1/2000
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vpcFooterVersion = $00010000;
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vpcDynamicVersion = $00010000;
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vpcSectorSize = 512;
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vpcUnallocatedBlock = $FFFFFFFF;
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vpcFixedDiskTableOffset = $FFFFFFFFFFFFFFFF;
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vpcDynamicDiskDataOffset = $FFFFFFFFFFFFFFFF;
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vpcMaxBlockGroup = $FF;
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vpcBlockGroupMask = $FF;
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vpcBlockGroupOffset = $100;
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[Expand]
VPC disk type constants vpcDiskType*
vpcMaxDiskType = 6;
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vpcDiskTypeNone = 0;
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vpcDiskTypeReserved1 = 1;
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vpcDiskTypeFixed = 2;
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vpcDiskTypeDynamic = 3;
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vpcDiskTypeDifferencing = 4;
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vpcDiskTypeReserved2 = 5;
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vpcDiskTypeReserved3 = 6;
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[Expand]
VPC feature constants vpcFeature*
vpcFeatureNone = $00000000;
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vpcFeatureTemporary = $00000001;
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vpcFeatureReserved = $00000002;
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This bit must always be set to 1
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[Expand]
VPC creator host OS constants vpcCreator*
vpcCreatorWindows = $5769326B;
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Wi2k
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vpcCreatorMacintosh = $4D616320;
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Mac
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[Expand]
VPC platform code constants vpcPlatform*
vpcPlatformNone = $00000000;
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vpcPlatformWi2r = $57693272;
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Wi2r deprecated
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vpcPlatformWi2k = $5769326B;
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Wi2k deprecated
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vpcPlatformW2ru = $57327275;
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W2ru Unicode pathname (UTF-16) on Windows relative to the differencing disk pathname
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vpcPlatformW2ku = $57326B75;
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W2ku Absolute Unicode (UTF-16) pathname on Windows
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vpcPlatformMac = $4D616320;
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Mac OS alias stored as a blob
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vpcPlatformMacX = $4D616358;
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MacX A file URL with UTF-8 encoding conforming to RFC 2396
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[Expand]
VPC bitmap mask constants vpcBitmapMask*
vpcBitmapMaskBits = 32;
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LongWord Bitmap Masks
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vpcBitmapMaskNone = $00000000;
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LongWord (Used for fast counting of free blocks)
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vpcBitmapMaskAll = $FFFFFFFF;
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LongWord (Used for fast counting of used blocks)
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vpcBitmapMasks:array[0..31] of LongWord = (
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$00000001,$00000002,$00000004,$00000008,$00000010,$00000020,$00000040,$00000080,
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$00000100,$00000200,$00000400,$00000800,$00001000,$00002000,$00004000,$00008000,
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$00010000,$00020000,$00040000,$00080000,$00100000,$00200000,$00400000,$00800000,
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$01000000,$02000000,$04000000,$08000000,$10000000,$20000000,$40000000,$80000000);
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vpcBitmapMasks:array[0..31] of LongWord = (
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Ordered to allow for big endian bitmap
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$00000080,$00000040,$00000020,$00000010,$00000008,$00000004,$00000002,$00000001,
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$00008000,$00004000,$00002000,$00001000,$00000800,$00000400,$00000200,$00000100,
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$00800000,$00400000,$00200000,$00100000,$00080000,$00040000,$00020000,$00010000,
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$80000000,$40000000,$20000000,$10000000,$08000000,$04000000,$02000000,$01000000);
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[Expand]
VirtualBox constants vbox*
vboxFileExtension = '.vdi';
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vboxDiskBanner = '<<< Sun xVM VirtualBox Disk Image >>>';
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Plus a LF character in some images (#10)
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vboxDiskVersion = $00010001;
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vboxDiskSignature = $BEDA107F;
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vboxFileMask = '*.vdi';
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vboxPathMask = '*.*';
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vboxDeltaPath = '..\Machines\';
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vboxParentPath = '..\..\..\VDI\';
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vboxNewParentPath = '..\..\..\HardDisks\';
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vboxSnapshotPath = '\Snapshots\';
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vboxUnallocatedBlock = $FFFFFFFF;
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[Expand]
VirtualBox disk type constants vboxDiskType*
vboxMaxDiskType = 4;
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vboxDiskTypeNone = 0;
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vboxDiskTypeDynamic = 1;
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vboxDiskTypeStatic = 2;
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vboxDiskTypeUnknown = 3;
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vboxDiskTypeDifferencing = 4;
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[Expand]
VirtualBox disk flag constants vboxDiskFlags*
vboxDiskFlagsNone = $00000000;
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Type definitions
ESX sparse extent header
[Expand]
PEsxSparseExtentHeader = ^TEsxSparseExtentHeader;
TEsxSparseExtentHeader = packed record
| Note: Always 2048 bytes (Only used for Delta disks, not Dynamic)
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magicNumber:LongWord;
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0x44574f43 / 'COWD'
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version:LongWord;
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The value of this entry should be 1
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flags:LongWord;
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set to 3
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numSectors:LongWord;
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total number of sectors on the base disk
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grainSize:LongWord;
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one sector by default. Can vary from one sector to 1MB
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gdOffset:LongWord;
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starts at the fourth sector, because the COWDisk_Header structure takes four sectors
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numGDEntries:LongWord;
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is CEILING(numSectors, gtCoverage)
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freeSector:LongWord;
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the next free data sector. This needs to be less than the length of the delta link. It is initially set to gdOffset + numGDSectors
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case Integer of
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0: (cylinders:LongWord;
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root
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heads:LongWord;
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sectors:LongWord;
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generation:LongWord;
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cont
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name:array[0..vmwareEsxSparseMaxNameLength - 1] of Char;
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description:array[0..vmwareEsxSparseMaxDescriptionLength - 1] of Char;
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savedGeneration:LongWord;
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used to detect the unclean shutdown of the delta link. It is initially set to 0
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reserved:array[0..7] of Char;
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uncleanShutdown:LongWord;
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used to trigger the metadata consistency check in case there is an abnormal termination of the program
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padding:array[0..395] of Char);
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1: (parentFileName:array[0..vmwareEsxSparseMaxParentLength - 1] of Char;
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child
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parentGeneration:LongWord;
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generationx:LongWord;
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cont
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namex:array[0..vmwareEsxSparseMaxNameLength - 1] of Char;
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descriptionx:array[0..vmwareEsxSparseMaxDescriptionLength - 1] of Char;
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savedGenerationx:LongWord;
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used to detect the unclean shutdown of the delta link. It is initially set to 0
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reservedx:array[0..7] of Char;
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uncleanShutdownx:LongWord;
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used to trigger the metadata consistency check in case there is an abnormal termination of the program
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paddingx:array[0..395] of Char);
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remaining fields are not used. They are present to maintain compatibility with legacy virtual disk formats
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VMware sparse extent header
[Expand]
PVmwareSparseExtentHeader = ^TVmwareSparseExtentHeader;
TVmwareSparseExtentHeader = packed record
| Note: Always 512 bytes (Used for both Dynamic and Delta disks)
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magicNumber:LongWord;
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0x564d444b / 'VMDK'
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version:LongWord;
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The value of this entry should be 1
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flags:LongWord;
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See above
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capacity:Int64;
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the capacity of this extent in sectors (should be a multiple of the grain size)
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grainSize:Int64;
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size of a grain in sectors (must be a power of 2 and must be greater than 8 (4KB))
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descriptorOffset:Int64;
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offset of the embedded descriptor in the extent (expressed in sectors)
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descriptorSize:Int64;
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valid only if descriptorOffset is non-zero (expressed in sectors)
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numGTEsPerGT:LongWord;
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the number of entries in a grain table (for VMware virtual disks is 512)
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rgdOffset:Int64;
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redundant level 0 of metadata (expressed in sectors)
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gdOffset:Int64;
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level 0 of metadata (expressed in sectors)
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overHead:Int64;
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number of sectors occupied by the metadata
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uncleanShutdown:ByteBool;
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set to FALSE when VMware software closes an extent. Four entries are used to detect when an extent file has been corrupted by transferring it using FTP in text mode. The entries should be initialized with the following values
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singleEndLineChar:Char;
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'\n'
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nonEndLineChar:Char;
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' '
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doubleEndLineChar1:Char;
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'\r'
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doubleEndLineChar2:Char;
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'\n'
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compressAlgorithm:Word;
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See above
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pad:array[0..432] of Byte;
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Microsoft virtual PC dish geometry
[Expand]
PVpcDiskGeometry = ^TVpcDiskGeometry;
TVpcDiskGeometry = packed record
| Note: Always 4 bytes
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Cylinders:Word;
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Cylinders
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Heads:Byte;
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Heads
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Sectors:Byte;
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Sectors per track
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Microsoft virtual PC parent locator
[Expand]
PVpcParentLocator = ^TVpcParentLocator;
TVpcParentLocator = packed record
| Note: Always 24 bytes
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PlatformCode:LongWord;
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describes which platform-specific format is used for the file locator (see above)
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PlatformDataSpace:LongWord;
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the number of 512-byte sectors needed to store the parent hard disk locator
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PlatformDataLength:LongWord;
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length of the parent hard disk locator in bytes
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Reserved:LongWord;
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Reserved, must be zero
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PlatformDataOffset:Int64;
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offset in bytes where the platform specific file locator data is stored
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Microsoft virtual PC hard disk footer
[Expand]
PVpcHardDiskFooter = ^TVpcHardDiskFooter;
TVpcHardDiskFooter = packed record
| Note: Always 512 bytes (At end of file on Fixed disks, at start and end on Dynamic and Differencing disks)
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Cookie:array[0..7] of Char;
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conectix
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Features:LongWord;
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Version:LongWord;
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0x00010000
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DataOffset:Int64;
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Offset to Dynamic Disk Header, Must be 0xFFFFFFFF for Fixed Disks
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TimeStamp:LongWord;
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seconds since January 1, 2000 12:00:00 AM in UTC/GMT (Unix Time minus 30 years)
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CreatorApplication:array[0..3] of Char;
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Microsoft Virtual PC = "vpc " / Microsoft Virtual Server = "vs "
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CreatorVersion:LongWord;
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Virtual Server 2004 = 0x00010000 / Virtual PC 2004 = 0x00050000
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CreatorHostOS:LongWord;
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Windows 0x5769326B (Wi2k) / Macintosh 0x4D616320 (Mac )
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OriginalSize:Int64;
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Size in Bytes of the VHD at Creation
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CurrentSize:Int64;
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Current Size in Bytes of the VHD
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DiskGeometry:TVpcDiskGeometry;
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See above
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DiskType:LongWord;
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See above
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Checksum:LongWord;
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1s compliment checksum of the footer
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UniqueId:TGUID;
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SavedState:ByteBool;
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Set to 1 if disk is in a saved state
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Reserved:array[0..426] of Byte;
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Reserved, must be zero
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Microsoft virtual PC dynamic disk header
[Expand]
PVpcDynamicDiskHeader = ^TVpcDynamicDiskHeader;
TVpcDynamicDiskHeader = packed record
| Note: Always 1024 bytes (Used for both Dynamic and Differencing disks)
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Cookie:array[0..7] of Char;
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cxsparse
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DataOffset:Int64;
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currently unused by existing formats and should be set to 0xFFFFFFFF
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TableOffset:Int64;
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absolute byte offset of the Block Allocation Table (BAT)
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HeaderVersion:LongWord;
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must be initialized to 0x00010000
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MaxTableEntries:LongWord;
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maximum entries present in the BAT. equal to the number of blocks in the disk (disk size divided by the blocksize)
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BlockSize:LongWord;
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The default value is 0x00200000 (indicating a block size of 2 MB)
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Checksum:LongWord;
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1s compliment checksum of the header
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ParentUniqueId:TGUID;
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only used for differencing hard disks
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ParentTimeStamp:LongWord;
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number of seconds since January 1, 2000 12:00:00 AM in UTC/GMT
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Reserved1:LongWord;
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Must be zero
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ParentUnicodeName:array[0..255] of WideChar;
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parent hard disk filename (Unicode /UTF16 string)
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ParentLocator1:TVpcParentLocator;
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These entries store an absolute byte offset in the file where the parent locator for a differencing hard disk is stored
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ParentLocator2:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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ParentLocator3:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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ParentLocator4:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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ParentLocator5:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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ParentLocator6:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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ParentLocator7:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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ParentLocator8:TVpcParentLocator;
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These fields are used only for differencing disks and should be set to zero for dynamic disks
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Reserved2:array[0..255] of Byte;
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Reserved, must be zero
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VirtualBox disk header
[Expand]
PVboxDiskHeader = ^TVboxDiskHeader;
TVboxDiskHeader = packed record
| Note: Always 512 bytes (At start of file for both Fixed and Dynamic disks)
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Banner:array[0..63] of Char;
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<<< Sun xVM VirtualBox Disk Image >>>
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Signature:LongWord;
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7F 10 DA BE
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Version:LongWord;
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1.1
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HeaderSize:LongWord;
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0x190
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DiskType:LongWord;
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see above
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DiskFlags:LongWord;
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see above
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Description:array[0..255] of Char;
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Unused
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BlocksOffset:LongWord;
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DataOffset:LongWord;
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Cylinders:LongWord;
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Heads:LongWord;
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Sectors:LongWord;
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SectorSize:LongWord;
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Reserved1:LongWord;
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Must be zero
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DiskSize:Int64;
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Bytes
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BlockSize:LongWord;
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BlockExtra:LongWord;
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TotalBlocks:LongWord;
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AllocatedBlocks:LongWord;
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UUID:TGUID;
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SnapshotUUID:TGUID;
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LinkUUID:TGUID;
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ParentUUID:TGUID;
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Unknown1:LongWord;
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Unknown2:LongWord;
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Reserved2:LongWord;
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Must be 0x3F
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Reserved3:LongWord;
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Must be 0x200
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Unused:array[0..9] of LongWord;
|
|
Class definitions
To be documented
Public variables
None defined
Function declarations
Initialization functions
[Expand]
procedure VirtualInit;
Description: To be documented
[Expand]
procedure VirtualQuit;
Description: To be documented
Virtual disk helper functions
[Expand]
function VirtualDataToPointer(const AData; ASize:Integer; ASwap:Boolean):Pointer;
Description: Creates a pointer and copies data from a buffer
| Note
|
Allows byte order swapping on copy
|
[Expand]
function VirtualPointerToData(APointer:Pointer; var AData; ASize:Integer; ASwap:Boolean):Boolean;
Description: Copies data to a buffer from supplied pointer
| Note
|
Allows byte order swapping on copy
|
[Expand]
function VirtualDataToString(const AData; ASize:Integer; AUnicode:Boolean):String;
Description: Converts the supplied data to a string
| Note
|
Accounts for unicode and byte ordering
|
[Expand]
function VirtualStringToData(const AString:String; var AData; ASize:Integer ;AUnicode:Boolean):Boolean;
Description: Converts the supplied string to data
| Note
|
Accounts for unicode and byte ordering
|
Return to Unit Reference
