/// <exception cref="System.IO.IOException"></exception>
/// <exception cref="System.IO.InvalidDataException"></exception>
/// <exception cref="System.NotImplementedException"></exception>
/// <exception cref="System.UnauthorizedAccessException"></exception>
public VirtualHardDisk(string virtualHardDiskPath) : base(virtualHardDiskPath)
{
// We can't read the VHD footer using this.ReadSector() because it's out of the disk boundaries
m_file = new RawDiskImage(virtualHardDiskPath, BytesPerDiskSector);
byte[] buffer = m_file.ReadSector(m_file.Size / BytesPerDiskSector - 1);
m_vhdFooter = new VHDFooter(buffer);
if (!m_vhdFooter.IsValid)
{
// check to see if a header is present (dynamic VHD) and use it instead
buffer = m_file.ReadSector(0);
m_vhdFooter = new VHDFooter(buffer);
if (!m_vhdFooter.IsValid)
{
throw new InvalidDataException("Invalid VHD footer");
}
}
if (m_vhdFooter.DiskType == VirtualHardDiskType.Fixed)
{
}
else if (m_vhdFooter.DiskType == VirtualHardDiskType.Dynamic)
{
buffer = m_file.ReadSectors(1, 2);
m_dynamicHeader = new DynamicDiskHeader(buffer);
m_blockAllocationTable = BlockAllocationTable.ReadBlockAllocationTable(virtualHardDiskPath, m_dynamicHeader);
}
else
{
throw new NotImplementedException("Differencing VHD is not supported");
}
SetGeometry();
}
/// <param name="diskSize">In bytes</param>
/// <exception cref="System.IO.IOException"></exception>
/// <exception cref="System.UnauthorizedAccessException"></exception>
public static VirtualHardDisk CreateDynamicDisk(string path, long diskSize)
{
const int BlockSizeInBytes = 4096 * BytesPerDiskSector;
if (diskSize % BlockSizeInBytes > 0)
{
// All blocks within a given image must be the same size
throw new ArgumentException("Dynamic VHD disk size must be a multiple of 2MiB");
}
VHDFooter footer = new VHDFooter();
footer.OriginalSize = (ulong)diskSize;
footer.CurrentSize = (ulong)diskSize;
footer.SetCurrentTimeStamp();
footer.SetDiskGeometry((ulong)diskSize / BytesPerDiskSector);
footer.DiskType = VirtualHardDiskType.Dynamic;
DynamicDiskHeader header = new DynamicDiskHeader();
header.TableOffset = VHDFooter.Length + DynamicDiskHeader.Length;
header.BlockSize = BlockSizeInBytes;
header.MaxTableEntries = (uint)Math.Ceiling((double)diskSize / BlockSizeInBytes);
BlockAllocationTable blockAllocationTable = new BlockAllocationTable(header.MaxTableEntries);
byte[] footerBytes = footer.GetBytes();
byte[] headerBytes = header.GetBytes();
byte[] blockAllocationTableBytes = blockAllocationTable.GetBytes();
int fileSize = VHDFooter.Length + DynamicDiskHeader.Length + blockAllocationTableBytes.Length + VHDFooter.Length;
RawDiskImage diskImage = RawDiskImage.Create(path, fileSize, BytesPerDiskSector);
diskImage.WriteSectors(0, footerBytes);
diskImage.WriteSectors(1, headerBytes);
diskImage.WriteSectors(3, blockAllocationTableBytes);
diskImage.WriteSectors(fileSize / BytesPerDiskSector - 1, footerBytes);
return(new VirtualHardDisk(path));
}
public bool Open(IFilter imageFilter)
{
Stream imageStream = imageFilter.GetDataForkStream();
byte[] header = new byte[512];
byte[] footer;
imageStream.Seek(0, SeekOrigin.Begin);
imageStream.Read(header, 0, 512);
if (imageStream.Length % 2 == 0)
{
footer = new byte[512];
imageStream.Seek(-512, SeekOrigin.End);
imageStream.Read(footer, 0, 512);
}
else
{
footer = new byte[511];
imageStream.Seek(-511, SeekOrigin.End);
imageStream.Read(footer, 0, 511);
}
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
uint headerChecksum = BigEndianBitConverter.ToUInt32(header, 0x40);
uint footerChecksum = BigEndianBitConverter.ToUInt32(footer, 0x40);
ulong headerCookie = BigEndianBitConverter.ToUInt64(header, 0);
ulong footerCookie = BigEndianBitConverter.ToUInt64(footer, 0);
header[0x40] = 0;
header[0x41] = 0;
header[0x42] = 0;
header[0x43] = 0;
footer[0x40] = 0;
footer[0x41] = 0;
footer[0x42] = 0;
footer[0x43] = 0;
uint headerCalculatedChecksum = VhdChecksum(header);
uint footerCalculatedChecksum = VhdChecksum(footer);
DicConsole.DebugWriteLine("VirtualPC plugin", "Header checksum = 0x{0:X8}, calculated = 0x{1:X8}",
headerChecksum, headerCalculatedChecksum);
DicConsole.DebugWriteLine("VirtualPC plugin", "Header checksum = 0x{0:X8}, calculated = 0x{1:X8}",
footerChecksum, footerCalculatedChecksum);
byte[] usableHeader;
uint usableChecksum;
if (headerCookie == IMAGE_COOKIE && headerChecksum == headerCalculatedChecksum)
{
usableHeader = header;
usableChecksum = headerChecksum;
}
else if (footerCookie == IMAGE_COOKIE && footerChecksum == footerCalculatedChecksum)
{
usableHeader = footer;
usableChecksum = footerChecksum;
}
else
{
throw new
ImageNotSupportedException("(VirtualPC plugin): Both header and footer are corrupt, image cannot be opened.");
}
thisFooter = new HardDiskFooter
{
Cookie = BigEndianBitConverter.ToUInt64(usableHeader, 0x00),
Features = BigEndianBitConverter.ToUInt32(usableHeader, 0x08),
Version = BigEndianBitConverter.ToUInt32(usableHeader, 0x0C),
Offset = BigEndianBitConverter.ToUInt64(usableHeader, 0x10),
Timestamp = BigEndianBitConverter.ToUInt32(usableHeader, 0x18),
CreatorApplication = BigEndianBitConverter.ToUInt32(usableHeader, 0x1C),
CreatorVersion = BigEndianBitConverter.ToUInt32(usableHeader, 0x20),
CreatorHostOs = BigEndianBitConverter.ToUInt32(usableHeader, 0x24),
OriginalSize = BigEndianBitConverter.ToUInt64(usableHeader, 0x28),
CurrentSize = BigEndianBitConverter.ToUInt64(usableHeader, 0x30),
DiskGeometry = BigEndianBitConverter.ToUInt32(usableHeader, 0x38),
DiskType = BigEndianBitConverter.ToUInt32(usableHeader, 0x3C),
Checksum = usableChecksum,
UniqueId = BigEndianBitConverter.ToGuid(usableHeader, 0x44),
SavedState = usableHeader[0x54],
Reserved = new byte[usableHeader.Length - 0x55]
};
Array.Copy(usableHeader, 0x55, thisFooter.Reserved, 0, usableHeader.Length - 0x55);
thisDateTime = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc);
thisDateTime = thisDateTime.AddSeconds(thisFooter.Timestamp);
Sha1Context sha1Ctx = new Sha1Context();
sha1Ctx.Update(thisFooter.Reserved);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.cookie = 0x{0:X8}", thisFooter.Cookie);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.features = 0x{0:X8}", thisFooter.Features);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.version = 0x{0:X8}", thisFooter.Version);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.offset = {0}", thisFooter.Offset);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.timestamp = 0x{0:X8} ({1})", thisFooter.Timestamp,
thisDateTime);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.creatorApplication = 0x{0:X8} (\"{1}\")",
thisFooter.CreatorApplication,
Encoding.ASCII.GetString(BigEndianBitConverter.GetBytes(thisFooter
.CreatorApplication)));
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.creatorVersion = 0x{0:X8}",
thisFooter.CreatorVersion);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.creatorHostOS = 0x{0:X8} (\"{1}\")",
thisFooter.CreatorHostOs,
Encoding.ASCII.GetString(BigEndianBitConverter
.GetBytes(thisFooter.CreatorHostOs)));
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.originalSize = {0}", thisFooter.OriginalSize);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.currentSize = {0}", thisFooter.CurrentSize);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.diskGeometry = 0x{0:X8} (C/H/S: {1}/{2}/{3})",
thisFooter.DiskGeometry, (thisFooter.DiskGeometry & 0xFFFF0000) >> 16,
(thisFooter.DiskGeometry & 0xFF00) >> 8,
thisFooter.DiskGeometry & 0xFF);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.diskType = 0x{0:X8}", thisFooter.DiskType);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.checksum = 0x{0:X8}", thisFooter.Checksum);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.uniqueId = {0}", thisFooter.UniqueId);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.savedState = 0x{0:X2}", thisFooter.SavedState);
DicConsole.DebugWriteLine("VirtualPC plugin", "footer.reserved's SHA1 = 0x{0}", sha1Ctx.End());
if (thisFooter.Version == VERSION1)
{
imageInfo.Version = "1.0";
}
else
{
throw new
ImageNotSupportedException($"(VirtualPC plugin): Unknown image type {thisFooter.DiskType} found. Please submit a bug with an example image.");
}
switch (thisFooter.CreatorApplication)
{
case CREATOR_QEMU:
{
imageInfo.Application = "QEMU";
// QEMU always set same version
imageInfo.ApplicationVersion = "Unknown";
break;
}
case CREATOR_VIRTUAL_BOX:
{
imageInfo.ApplicationVersion =
$"{(thisFooter.CreatorVersion & 0xFFFF0000) >> 16}.{thisFooter.CreatorVersion & 0x0000FFFF:D2}";
switch (thisFooter.CreatorHostOs)
{
case CREATOR_MACINTOSH:
case CREATOR_MACINTOSH_OLD:
imageInfo.Application = "VirtualBox for Mac";
break;
case CREATOR_WINDOWS:
// VirtualBox uses Windows creator for any other OS
imageInfo.Application = "VirtualBox";
break;
default:
imageInfo.Application =
$"VirtualBox for unknown OS \"{Encoding.ASCII.GetString(BigEndianBitConverter.GetBytes(thisFooter.CreatorHostOs))}\"";
break;
}
break;
}
case CREATOR_VIRTUAL_SERVER:
{
imageInfo.Application = "Microsoft Virtual Server";
switch (thisFooter.CreatorVersion)
{
case VERSION_VIRTUAL_SERVER2004:
imageInfo.ApplicationVersion = "2004";
break;
default:
imageInfo.ApplicationVersion = $"Unknown version 0x{thisFooter.CreatorVersion:X8}";
break;
}
break;
}
case CREATOR_VIRTUAL_PC:
{
switch (thisFooter.CreatorHostOs)
{
case CREATOR_MACINTOSH:
case CREATOR_MACINTOSH_OLD:
switch (thisFooter.CreatorVersion)
{
case VERSION_VIRTUAL_PC_MAC:
imageInfo.Application = "Connectix Virtual PC";
imageInfo.ApplicationVersion = "5, 6 or 7";
break;
default:
imageInfo.ApplicationVersion = $"Unknown version 0x{thisFooter.CreatorVersion:X8}";
break;
}
break;
case CREATOR_WINDOWS:
switch (thisFooter.CreatorVersion)
{
case VERSION_VIRTUAL_PC_MAC:
imageInfo.Application = "Connectix Virtual PC";
imageInfo.ApplicationVersion = "5, 6 or 7";
break;
case VERSION_VIRTUAL_PC2004:
imageInfo.Application = "Microsoft Virtual PC";
imageInfo.ApplicationVersion = "2004";
break;
case VERSION_VIRTUAL_PC2007:
imageInfo.Application = "Microsoft Virtual PC";
imageInfo.ApplicationVersion = "2007";
break;
default:
imageInfo.ApplicationVersion = $"Unknown version 0x{thisFooter.CreatorVersion:X8}";
break;
}
break;
default:
imageInfo.Application =
$"Virtual PC for unknown OS \"{Encoding.ASCII.GetString(BigEndianBitConverter.GetBytes(thisFooter.CreatorHostOs))}\"";
imageInfo.ApplicationVersion = $"Unknown version 0x{thisFooter.CreatorVersion:X8}";
break;
}
break;
}
case CREATOR_DISCIMAGECHEF:
{
imageInfo.Application = "DiscImageChef";
imageInfo.ApplicationVersion =
$"{(thisFooter.CreatorVersion & 0xFF000000) >> 24}.{(thisFooter.CreatorVersion & 0xFF0000) >> 16}.{(thisFooter.CreatorVersion & 0xFF00) >> 8}.{thisFooter.CreatorVersion & 0xFF}";
}
break;
default:
{
imageInfo.Application =
$"Unknown application \"{Encoding.ASCII.GetString(BigEndianBitConverter.GetBytes(thisFooter.CreatorHostOs))}\"";
imageInfo.ApplicationVersion = $"Unknown version 0x{thisFooter.CreatorVersion:X8}";
break;
}
}
thisFilter = imageFilter;
imageInfo.ImageSize = thisFooter.CurrentSize;
imageInfo.Sectors = thisFooter.CurrentSize / 512;
imageInfo.SectorSize = 512;
imageInfo.CreationTime = imageFilter.GetCreationTime();
imageInfo.LastModificationTime = thisDateTime;
imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.GetFilename());
imageInfo.Cylinders = (thisFooter.DiskGeometry & 0xFFFF0000) >> 16;
imageInfo.Heads = (thisFooter.DiskGeometry & 0xFF00) >> 8;
imageInfo.SectorsPerTrack = thisFooter.DiskGeometry & 0xFF;
if (thisFooter.DiskType == TYPE_DYNAMIC || thisFooter.DiskType == TYPE_DIFFERENCING)
{
imageStream.Seek((long)thisFooter.Offset, SeekOrigin.Begin);
byte[] dynamicBytes = new byte[1024];
imageStream.Read(dynamicBytes, 0, 1024);
uint dynamicChecksum = BigEndianBitConverter.ToUInt32(dynamicBytes, 0x24);
dynamicBytes[0x24] = 0;
dynamicBytes[0x25] = 0;
dynamicBytes[0x26] = 0;
dynamicBytes[0x27] = 0;
uint dynamicChecksumCalculated = VhdChecksum(dynamicBytes);
DicConsole.DebugWriteLine("VirtualPC plugin",
"Dynamic header checksum = 0x{0:X8}, calculated = 0x{1:X8}", dynamicChecksum,
dynamicChecksumCalculated);
if (dynamicChecksum != dynamicChecksumCalculated)
{
throw new
ImageNotSupportedException("(VirtualPC plugin): Both header and footer are corrupt, image cannot be opened.");
}
thisDynamic =
new DynamicDiskHeader {
LocatorEntries = new ParentLocatorEntry[8], Reserved2 = new byte[256]
};
for (int i = 0; i < 8; i++)
{
thisDynamic.LocatorEntries[i] = new ParentLocatorEntry();
}
thisDynamic.Cookie = BigEndianBitConverter.ToUInt64(dynamicBytes, 0x00);
thisDynamic.DataOffset = BigEndianBitConverter.ToUInt64(dynamicBytes, 0x08);
thisDynamic.TableOffset = BigEndianBitConverter.ToUInt64(dynamicBytes, 0x10);
thisDynamic.HeaderVersion = BigEndianBitConverter.ToUInt32(dynamicBytes, 0x18);
thisDynamic.MaxTableEntries = BigEndianBitConverter.ToUInt32(dynamicBytes, 0x1C);
thisDynamic.BlockSize = BigEndianBitConverter.ToUInt32(dynamicBytes, 0x20);
thisDynamic.Checksum = dynamicChecksum;
thisDynamic.ParentId = BigEndianBitConverter.ToGuid(dynamicBytes, 0x28);
thisDynamic.ParentTimestamp = BigEndianBitConverter.ToUInt32(dynamicBytes, 0x38);
thisDynamic.Reserved = BigEndianBitConverter.ToUInt32(dynamicBytes, 0x3C);
thisDynamic.ParentName = Encoding.BigEndianUnicode.GetString(dynamicBytes, 0x40, 512);
for (int i = 0; i < 8; i++)
{
thisDynamic.LocatorEntries[i].PlatformCode =
BigEndianBitConverter.ToUInt32(dynamicBytes, 0x240 + 0x00 + 24 * i);
thisDynamic.LocatorEntries[i].PlatformDataSpace =
BigEndianBitConverter.ToUInt32(dynamicBytes, 0x240 + 0x04 + 24 * i);
thisDynamic.LocatorEntries[i].PlatformDataLength =
BigEndianBitConverter.ToUInt32(dynamicBytes, 0x240 + 0x08 + 24 * i);
thisDynamic.LocatorEntries[i].Reserved =
BigEndianBitConverter.ToUInt32(dynamicBytes, 0x240 + 0x0C + 24 * i);
thisDynamic.LocatorEntries[i].PlatformDataOffset =
BigEndianBitConverter.ToUInt64(dynamicBytes, 0x240 + 0x10 + 24 * i);
}
Array.Copy(dynamicBytes, 0x300, thisDynamic.Reserved2, 0, 256);
parentDateTime = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc);
parentDateTime = parentDateTime.AddSeconds(thisDynamic.ParentTimestamp);
sha1Ctx = new Sha1Context();
sha1Ctx.Update(thisDynamic.Reserved2);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.cookie = 0x{0:X8}", thisDynamic.Cookie);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.dataOffset = {0}", thisDynamic.DataOffset);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.tableOffset = {0}", thisDynamic.TableOffset);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.headerVersion = 0x{0:X8}",
thisDynamic.HeaderVersion);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.maxTableEntries = {0}",
thisDynamic.MaxTableEntries);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.blockSize = {0}", thisDynamic.BlockSize);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.checksum = 0x{0:X8}", thisDynamic.Checksum);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.parentID = {0}", thisDynamic.ParentId);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.parentTimestamp = 0x{0:X8} ({1})",
thisDynamic.ParentTimestamp, parentDateTime);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.reserved = 0x{0:X8}", thisDynamic.Reserved);
for (int i = 0; i < 8; i++)
{
DicConsole.DebugWriteLine("VirtualPC plugin",
"dynamic.locatorEntries[{0}].platformCode = 0x{1:X8} (\"{2}\")", i,
thisDynamic.LocatorEntries[i].PlatformCode,
Encoding.ASCII.GetString(BigEndianBitConverter.GetBytes(thisDynamic
.LocatorEntries[i]
.PlatformCode)));
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.locatorEntries[{0}].platformDataSpace = {1}",
i, thisDynamic.LocatorEntries[i].PlatformDataSpace);
DicConsole.DebugWriteLine("VirtualPC plugin",
"dynamic.locatorEntries[{0}].platformDataLength = {1}", i,
thisDynamic.LocatorEntries[i].PlatformDataLength);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.locatorEntries[{0}].reserved = 0x{1:X8}", i,
thisDynamic.LocatorEntries[i].Reserved);
DicConsole.DebugWriteLine("VirtualPC plugin",
"dynamic.locatorEntries[{0}].platformDataOffset = {1}", i,
thisDynamic.LocatorEntries[i].PlatformDataOffset);
}
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.parentName = \"{0}\"",
thisDynamic.ParentName);
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.reserved2's SHA1 = 0x{0}", sha1Ctx.End());
if (thisDynamic.HeaderVersion != VERSION1)
{
throw new
ImageNotSupportedException($"(VirtualPC plugin): Unknown image type {thisFooter.DiskType} found. Please submit a bug with an example image.");
}
DateTime startTime = DateTime.UtcNow;
blockAllocationTable = new uint[thisDynamic.MaxTableEntries];
// Safe and slow code. It takes 76,572 ms to fill a 30720 entries BAT
/*
* byte[] bat = new byte[thisDynamic.maxTableEntries * 4];
* imageStream.Seek((long)thisDynamic.tableOffset, SeekOrigin.Begin);
* imageStream.Read(bat, 0, (int)(thisDynamic.maxTableEntries * 4));
* for (int i = 0; i < thisDynamic.maxTableEntries; i++)
* blockAllocationTable[i] = BigEndianBitConverter.ToUInt32(bat, 4 * i);
*
* DateTime endTime = DateTime.UtcNow;
* DicConsole.DebugWriteLine("VirtualPC plugin", "Filling the BAT took {0} seconds", (endTime-startTime).TotalSeconds);
*/
// How many sectors uses the BAT
uint batSectorCount = (uint)Math.Ceiling((double)thisDynamic.MaxTableEntries * 4 / 512);
byte[] batSectorBytes = new byte[512];
// Unsafe and fast code. It takes 4 ms to fill a 30720 entries BAT
for (int i = 0; i < batSectorCount; i++)
{
imageStream.Seek((long)thisDynamic.TableOffset + i * 512, SeekOrigin.Begin);
imageStream.Read(batSectorBytes, 0, 512);
// This does the big-endian trick but reverses the order of elements also
Array.Reverse(batSectorBytes);
GCHandle handle = GCHandle.Alloc(batSectorBytes, GCHandleType.Pinned);
BatSector batSector =
(BatSector)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(BatSector));
handle.Free();
// This restores the order of elements
Array.Reverse(batSector.blockPointer);
if (blockAllocationTable.Length >= i * 512 / 4 + 512 / 4)
{
Array.Copy(batSector.blockPointer, 0, blockAllocationTable, i * 512 / 4, 512 / 4);
}
else
{
Array.Copy(batSector.blockPointer, 0, blockAllocationTable, i * 512 / 4,
blockAllocationTable.Length - i * 512 / 4);
}
}
DateTime endTime = DateTime.UtcNow;
DicConsole.DebugWriteLine("VirtualPC plugin", "Filling the BAT took {0} seconds",
(endTime - startTime).TotalSeconds);
// Too noisy
/*
* for (int i = 0; i < thisDynamic.maxTableEntries; i++)
* DicConsole.DebugWriteLine("VirtualPC plugin", "blockAllocationTable[{0}] = {1}", i, blockAllocationTable[i]);
*/
// Get the roundest number of sectors needed to store the block bitmap
bitmapSize = (uint)Math.Ceiling((double)thisDynamic.BlockSize / 512
// 1 bit per sector on the bitmap
/ 8
// and aligned to 512 byte boundary
/ 512);
DicConsole.DebugWriteLine("VirtualPC plugin", "Bitmap is {0} sectors", bitmapSize);
}
imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
switch (thisFooter.DiskType)
{
case TYPE_FIXED:
case TYPE_DYNAMIC:
{
// Nothing to do here, really.
return(true);
}
case TYPE_DIFFERENCING:
{
locatorEntriesData = new byte[8][];
for (int i = 0; i < 8; i++)
{
if (thisDynamic.LocatorEntries[i].PlatformCode != 0x00000000)
{
locatorEntriesData[i] = new byte[thisDynamic.LocatorEntries[i].PlatformDataLength];
imageStream.Seek((long)thisDynamic.LocatorEntries[i].PlatformDataOffset, SeekOrigin.Begin);
imageStream.Read(locatorEntriesData[i], 0,
(int)thisDynamic.LocatorEntries[i].PlatformDataLength);
switch (thisDynamic.LocatorEntries[i].PlatformCode)
{
case PLATFORM_CODE_WINDOWS_ABSOLUTE:
case PLATFORM_CODE_WINDOWS_RELATIVE:
DicConsole.DebugWriteLine("VirtualPC plugin",
"dynamic.locatorEntries[{0}] = \"{1}\"", i,
Encoding.ASCII.GetString(locatorEntriesData[i]));
break;
case PLATFORM_CODE_WINDOWS_ABSOLUTE_U:
case PLATFORM_CODE_WINDOWS_RELATIVE_U:
DicConsole.DebugWriteLine("VirtualPC plugin",
"dynamic.locatorEntries[{0}] = \"{1}\"", i,
Encoding.BigEndianUnicode
.GetString(locatorEntriesData[i]));
break;
case PLATFORM_CODE_MACINTOSH_URI:
DicConsole.DebugWriteLine("VirtualPC plugin",
"dynamic.locatorEntries[{0}] = \"{1}\"", i,
Encoding.UTF8.GetString(locatorEntriesData[i]));
break;
default:
DicConsole.DebugWriteLine("VirtualPC plugin", "dynamic.locatorEntries[{0}] =", i);
PrintHex.PrintHexArray(locatorEntriesData[i], 64);
break;
}
}
}
int currentLocator = 0;
bool locatorFound = false;
string parentPath = null;
while (!locatorFound && currentLocator < 8)
{
switch (thisDynamic.LocatorEntries[currentLocator].PlatformCode)
{
case PLATFORM_CODE_WINDOWS_ABSOLUTE:
case PLATFORM_CODE_WINDOWS_RELATIVE:
parentPath = Encoding.ASCII.GetString(locatorEntriesData[currentLocator]);
break;
case PLATFORM_CODE_WINDOWS_ABSOLUTE_U:
case PLATFORM_CODE_WINDOWS_RELATIVE_U:
parentPath = Encoding.BigEndianUnicode.GetString(locatorEntriesData[currentLocator]);
break;
case PLATFORM_CODE_MACINTOSH_URI:
parentPath =
Uri.UnescapeDataString(Encoding.UTF8.GetString(locatorEntriesData[currentLocator]));
if (parentPath.StartsWith("file://localhost", StringComparison.InvariantCulture))
{
parentPath = parentPath.Remove(0, 16);
}
else
{
DicConsole.DebugWriteLine("VirtualPC plugin",
"Unsupported protocol classified found in URI parent path: \"{0}\"",
parentPath);
parentPath = null;
}
break;
}
if (parentPath != null)
{
DicConsole.DebugWriteLine("VirtualPC plugin", "Possible parent path: \"{0}\"", parentPath);
IFilter parentFilter =
new FiltersList().GetFilter(Path.Combine(imageFilter.GetParentFolder(), parentPath));
if (parentFilter != null)
{
locatorFound = true;
}
if (!locatorFound)
{
parentPath = null;
}
}
currentLocator++;
}
if (!locatorFound)
{
throw new
FileNotFoundException("(VirtualPC plugin): Cannot find parent file for differencing disk image");
}
{
parentImage = new Vhd();
IFilter parentFilter =
new FiltersList().GetFilter(Path.Combine(imageFilter.GetParentFolder(), parentPath));
if (parentFilter == null)
{
throw new ImageNotSupportedException("(VirtualPC plugin): Cannot find parent image filter");
}
/* PluginBase plugins = new PluginBase();
* plugins.RegisterAllPlugins();
* if (!plugins.ImagePluginsList.TryGetValue(Name.ToLower(), out parentImage))
* throw new SystemException("(VirtualPC plugin): Unable to open myself");*/
if (!parentImage.Identify(parentFilter))
{
throw new
ImageNotSupportedException("(VirtualPC plugin): Parent image is not a Virtual PC disk image");
}
if (!parentImage.Open(parentFilter))
{
throw new ImageNotSupportedException("(VirtualPC plugin): Cannot open parent disk image");
}
// While specification says that parent and child disk images should contain UUID relationship
// in reality it seems that old differencing disk images stored a parent UUID that, nonetheless
// the parent never stored itself. So the only real way to know that images are related is
// because the parent IS found and SAME SIZE. Ugly...
// More funny even, tested parent images show an empty host OS, and child images a correct one.
if (parentImage.Info.Sectors != imageInfo.Sectors)
{
throw new
ImageNotSupportedException("(VirtualPC plugin): Parent image is of different size");
}
}
return(true);
}
case TYPE_DEPRECATED1:
case TYPE_DEPRECATED2:
case TYPE_DEPRECATED3:
{
throw new
ImageNotSupportedException("(VirtualPC plugin): Deprecated image type found. Please submit a bug with an example image.");
}
default:
{
throw new
ImageNotSupportedException($"(VirtualPC plugin): Unknown image type {thisFooter.DiskType} found. Please submit a bug with an example image.");
}
}
}
