9.04 beta

CPP/7zip/Archive/VhdHandler.cpp

@@ -0,0 +1,731 @@
+// VhdHandler.cpp
+
+#include "StdAfx.h"
+
+#include "../../../C/CpuArch.h"
+
+#include "Common/Buffer.h"
+#include "Common/ComTry.h"
+#include "Common/IntToString.h"
+#include "Common/MyString.h"
+
+#include "Windows/PropVariant.h"
+
+#include "../Common/LimitedStreams.h"
+#include "../Common/ProgressUtils.h"
+#include "../Common/RegisterArc.h"
+#include "../Common/StreamUtils.h"
+
+#include "../Compress/CopyCoder.h"
+
+#define Get16(p) GetBe16(p)
+#define Get32(p) GetBe32(p)
+#define Get64(p) GetBe64(p)
+
+#define G32(p, dest) dest = Get32(p);
+#define G64(p, dest) dest = Get64(p);
+
+using namespace NWindows;
+
+namespace NArchive {
+namespace NVhd {
+
+static const UInt32 kUnusedBlock = 0xFFFFFFFF;
+
+static const UInt32 kDiskType_Fixed = 2;
+static const UInt32 kDiskType_Dynamic = 3;
+static const UInt32 kDiskType_Diff = 4;
+
+static const char *kDiskTypes[] =
+{
+  "0",
+  "1",
+  "Fixed",
+  "Dynamic",
+  "Differencing"
+};
+
+struct CFooter
+{
+  // UInt32 Features;
+  // UInt32 FormatVersion;
+  UInt64 DataOffset;
+  UInt32 CTime;
+  UInt32 CreatorApp;
+  UInt32 CreatorVersion;
+  UInt32 CreatorHostOS;
+  // UInt64 OriginalSize;
+  UInt64 CurrentSize;
+  UInt32 DiskGeometry;
+  UInt32 Type;
+  Byte Id[16];
+  Byte SavedState;
+
+  bool IsFixed() const { return Type == kDiskType_Fixed; }
+  bool ThereIsDynamic() const { return Type == kDiskType_Dynamic || Type == kDiskType_Diff; }
+  // bool IsSupported() const { return Type == kDiskType_Fixed || Type == kDiskType_Dynamic || Type == kDiskType_Diff; }
+  UInt32 NumCyls() const { return DiskGeometry >> 16; }
+  UInt32 NumHeads() const { return (DiskGeometry >> 8) & 0xFF; }
+  UInt32 NumSectorsPerTrack() const { return DiskGeometry & 0xFF; }
+  AString GetTypeString() const;
+  bool Parse(const Byte *p);
+};
+
+AString CFooter::GetTypeString() const
+{
+  if (Type < sizeof(kDiskTypes) / sizeof(kDiskTypes[0]))
+    return kDiskTypes[Type];
+  char s[16];
+  ConvertUInt32ToString(Type, s);
+  return s;
+}
+
+static bool CheckBlock(const Byte *p, unsigned size, unsigned checkSumOffset, unsigned zeroOffset)
+{
+  UInt32 sum = 0;
+  unsigned i;
+  for (i = 0; i < checkSumOffset; i++)
+    sum += p[i];
+  for (i = checkSumOffset + 4; i < size; i++)
+    sum += p[i];
+  if (~sum != Get32(p + checkSumOffset))
+    return false;
+  for (i = zeroOffset; i < size; i++)
+    if (p[i] != 0)
+      return false;
+  return true;
+}
+
+bool CFooter::Parse(const Byte *p)
+{
+  if (memcmp(p, "conectix", 8) != 0)
+    return false;
+  // G32(p + 0x08, Features);
+  // G32(p + 0x0C, FormatVersion);
+  G64(p + 0x10, DataOffset);
+  G32(p + 0x18, CTime);
+  G32(p + 0x1C, CreatorApp);
+  G32(p + 0x20, CreatorVersion);
+  G32(p + 0x24, CreatorHostOS);
+  // G64(p + 0x28, OriginalSize);
+  G64(p + 0x30, CurrentSize);
+  G32(p + 0x38, DiskGeometry);
+  G32(p + 0x3C, Type);
+  memcpy(Id, p + 0x44, 16);
+  SavedState = p[0x54];
+  return CheckBlock(p, 512, 0x40, 0x55);
+}
+
+/*
+struct CParentLocatorEntry
+{
+  UInt32 Code;
+  UInt32 DataSpace;
+  UInt32 DataLen;
+  UInt64 DataOffset;
+
+  bool Parse(const Byte *p);
+};
+bool CParentLocatorEntry::Parse(const Byte *p)
+{
+  G32(p + 0x00, Code);
+  G32(p + 0x04, DataSpace);
+  G32(p + 0x08, DataLen);
+  G32(p + 0x10, DataOffset);
+  return (Get32(p + 0x0C) == 0); // Resrved
+}
+*/
+
+struct CDynHeader
+{
+  // UInt64 DataOffset;
+  UInt64 TableOffset;
+  // UInt32 HeaderVersion;
+  UInt32 NumBlocks;
+  int BlockSizeLog;
+  UInt32 ParentTime;
+  Byte ParentId[16];
+  UString ParentName;
+  // CParentLocatorEntry ParentLocators[8];
+
+  bool Parse(const Byte *p);
+  UInt32 NumBitMapSectors() const
+  {
+    UInt32 numSectorsInBlock = (1 << (BlockSizeLog - 9));
+    return (numSectorsInBlock + 512 * 8 - 1) / (512 * 8);
+  }
+};
+
+static int GetLog(UInt32 num)
+{
+  for (int i = 0; i < 31; i++)
+    if (((UInt32)1 << i) == num)
+      return i;
+  return -1;
+}
+
+bool CDynHeader::Parse(const Byte *p)
+{
+  if (memcmp(p, "cxsparse", 8) != 0)
+    return false;
+  // G64(p + 0x08, DataOffset);
+  G64(p + 0x10, TableOffset);
+  // G32(p + 0x18, HeaderVersion);
+  G32(p + 0x1C, NumBlocks);
+  BlockSizeLog = GetLog(Get32(p + 0x20));
+  if (BlockSizeLog < 9 || BlockSizeLog > 30)
+    return false;
+  G32(p + 0x38, ParentTime);
+  if (Get32(p + 0x3C) != 0) // reserved
+    return false;
+  memcpy(ParentId, p + 0x28, 16);
+  {
+    const int kNameLength = 256;
+    wchar_t *s = ParentName.GetBuffer(kNameLength);
+    for (unsigned i = 0; i < kNameLength; i++)
+      s[i] = Get16(p + 0x40 + i * 2);
+    s[kNameLength] = 0;
+    ParentName.ReleaseBuffer();
+  }
+  /*
+  for (int i = 0; i < 8; i++)
+    if (!ParentLocators[i].Parse(p + 0x240 + i * 24))
+      return false;
+  */
+  return CheckBlock(p, 1024, 0x24, 0x240 + 8 * 24);
+}
+
+class CHandler:
+  public IInStream,
+  public IInArchive,
+  public IInArchiveGetStream,
+  public CMyUnknownImp
+{
+  UInt64 _virtPos;
+  UInt64 _phyPos;
+  UInt64 _phyLimit;
+
+  CFooter Footer;
+  CDynHeader Dyn;
+  CRecordVector<UInt32> Bat;
+  CByteBuffer BitMap;
+  UInt32 BitMapTag;
+  UInt32 NumUsedBlocks;
+  CMyComPtr<IInStream> Stream;
+  CMyComPtr<IInStream> ParentStream;
+  CHandler *Parent;
+
+  HRESULT Seek(UInt64 offset);
+  HRESULT InitAndSeek();
+  HRESULT ReadPhy(UInt64 offset, void *data, UInt32 size);
+
+  bool NeedParent() const { return Footer.Type == kDiskType_Diff; }
+  UInt64 GetSize() const { return Footer.CurrentSize; }
+  UInt64 GetPackSize() const
+    { return Footer.ThereIsDynamic() ? ((UInt64)NumUsedBlocks << Dyn.BlockSizeLog) : Footer.CurrentSize; }
+
+  UString GetParentName() const
+  {
+    const CHandler *p = this;
+    UString res;
+    while (p && p->NeedParent())
+    {
+      if (!res.IsEmpty())
+        res += L" -> ";
+      res += p->Dyn.ParentName;
+      p = p->Parent;
+    }
+    return res;
+  }
+
+  bool IsOK() const
+  {
+    const CHandler *p = this;
+    while (p->NeedParent())
+    {
+      p = p->Parent;
+      if (p == 0)
+        return false;
+    }
+    return true;
+  }
+
+  HRESULT Open3();
+  HRESULT Open2(IInStream *stream, CHandler *child, IArchiveOpenCallback *openArchiveCallback, int level);
+
+public:
+  MY_UNKNOWN_IMP3(IInArchive, IInArchiveGetStream, IInStream)
+
+  INTERFACE_IInArchive(;)
+  STDMETHOD(GetStream)(UInt32 index, ISequentialInStream **stream);
+  STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize);
+  STDMETHOD(Seek)(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition);
+};
+
+HRESULT CHandler::Seek(UInt64 offset) { return Stream->Seek(offset, STREAM_SEEK_SET, NULL); }
+
+HRESULT CHandler::InitAndSeek()
+{
+  if (ParentStream)
+  {
+    RINOK(Parent->InitAndSeek());
+  }
+  _virtPos = _phyPos = 0;
+  BitMapTag = kUnusedBlock;
+  BitMap.SetCapacity(Dyn.NumBitMapSectors() << 9);
+  return Seek(0);
+}
+
+HRESULT CHandler::ReadPhy(UInt64 offset, void *data, UInt32 size)
+{
+  if (offset + size > _phyLimit)
+    return S_FALSE;
+  if (offset != _phyPos)
+  {
+    _phyPos = offset;
+    RINOK(Seek(offset));
+  }
+  HRESULT res = ReadStream_FALSE(Stream, data, size);
+  _phyPos += size;
+  return res;
+}
+
+HRESULT CHandler::Open3()
+{
+  RINOK(Stream->Seek(0, STREAM_SEEK_END, &_phyPos));
+  if (_phyPos < 512)
+    return S_FALSE;
+  const UInt32 kDynSize = 1024;
+  Byte buf[kDynSize];
+
+  _phyLimit = _phyPos;
+  RINOK(ReadPhy(_phyLimit - 512, buf, 512));
+  if (!Footer.Parse(buf))
+    return S_FALSE;
+  _phyLimit -= 512;
+
+  if (!Footer.ThereIsDynamic())
+    return S_OK;
+
+  RINOK(ReadPhy(0, buf + 512, 512));
+  if (memcmp(buf, buf + 512, 512) != 0)
+    return S_FALSE;
+
+  RINOK(ReadPhy(Footer.DataOffset, buf, kDynSize));
+  if (!Dyn.Parse(buf))
+    return S_FALSE;
+  
+  if (Dyn.NumBlocks >= (UInt32)1 << 31)
+    return S_FALSE;
+  if (GetSize() != ((UInt64)Dyn.NumBlocks << Dyn.BlockSizeLog))
+    return S_FALSE;
+
+  Bat.Reserve(Dyn.NumBlocks);
+  while ((UInt32)Bat.Size() < Dyn.NumBlocks)
+  {
+    RINOK(ReadPhy(Dyn.TableOffset + (UInt64)Bat.Size() * 4, buf, 512));
+    for (UInt32 j = 0; j < 512; j += 4)
+    {
+      UInt32 v = Get32(buf + j);
+      if (v != kUnusedBlock)
+        NumUsedBlocks++;
+      Bat.Add(v);
+      if ((UInt32)Bat.Size() >= Dyn.NumBlocks)
+        break;
+    }
+  }
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  if (processedSize != NULL)
+    *processedSize = 0;
+  if (_virtPos >= GetSize())
+    return (GetSize() == _virtPos) ? S_OK: E_FAIL;
+  if (size == 0)
+    return S_OK;
+  UInt32 blockIndex = (UInt32)(_virtPos >> Dyn.BlockSizeLog);
+  UInt32 blockSectIndex = Bat[blockIndex];
+  UInt32 blockSize = (UInt32)1 << Dyn.BlockSizeLog;
+  UInt32 offsetInBlock = (UInt32)_virtPos & (blockSize - 1);
+  size = MyMin(blockSize - offsetInBlock, size);
+
+  HRESULT res = S_OK;
+  if (blockSectIndex == kUnusedBlock)
+  {
+    if (ParentStream)
+    {
+      RINOK(ParentStream->Seek(_virtPos, STREAM_SEEK_SET, NULL));
+      res = ParentStream->Read(data, size, &size);
+    }
+    else
+      memset(data, 0, size);
+  }
+  else
+  {
+    UInt64 newPos = (UInt64)blockSectIndex << 9;
+    if (BitMapTag != blockIndex)
+    {
+      RINOK(ReadPhy(newPos, BitMap, (UInt32)BitMap.GetCapacity()));
+      BitMapTag = blockIndex;
+    }
+    RINOK(ReadPhy(newPos + BitMap.GetCapacity() + offsetInBlock, data, size));
+    for (UInt32 cur = 0; cur < size;)
+    {
+      UInt32 rem = MyMin(0x200 - (offsetInBlock & 0x1FF), size - cur);
+      UInt32 bmi = offsetInBlock >> 9;
+      if (((BitMap[bmi >> 3] >> (7 - (bmi & 7))) & 1) == 0)
+      {
+        if (ParentStream)
+        {
+          RINOK(ParentStream->Seek(_virtPos + cur, STREAM_SEEK_SET, NULL));
+          RINOK(ReadStream_FALSE(ParentStream, (Byte *)data + cur, rem));
+        }
+        else
+        {
+          const Byte *p = (const Byte *)data + cur;
+          for (UInt32 i = 0; i < rem; i++)
+            if (p[i] != 0)
+              return S_FALSE;
+        }
+      }
+      offsetInBlock += rem;
+      cur += rem;
+    }
+  }
+  if (processedSize != NULL)
+    *processedSize = size;
+  _virtPos += size;
+  return res;
+}
+
+STDMETHODIMP CHandler::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
+{
+  switch(seekOrigin)
+  {
+    case STREAM_SEEK_SET: _virtPos = offset; break;
+    case STREAM_SEEK_CUR: _virtPos += offset; break;
+    case STREAM_SEEK_END: _virtPos = GetSize() + offset; break;
+    default: return STG_E_INVALIDFUNCTION;
+  }
+  if (newPosition)
+    *newPosition = _virtPos;
+  return S_OK;
+}
+
+enum
+{
+  kpidParent = kpidUserDefined,
+  kpidSavedState
+};
+
+STATPROPSTG kArcProps[] =
+{
+  { NULL, kpidSize, VT_UI8},
+  { NULL, kpidCTime, VT_FILETIME},
+  { NULL, kpidClusterSize, VT_UI8},
+  { NULL, kpidMethod, VT_BSTR},
+  { L"Parent", kpidParent, VT_BSTR},
+  { NULL, kpidCreatorApp, VT_BSTR},
+  { NULL, kpidHostOS, VT_BSTR},
+  { L"Saved State", kpidSavedState, VT_BOOL},
+  { NULL, kpidId, VT_BSTR}
+ };
+
+STATPROPSTG kProps[] =
+{
+  { NULL, kpidSize, VT_UI8},
+  { NULL, kpidPackSize, VT_UI8},
+  { NULL, kpidCTime, VT_FILETIME}
+  
+  /*
+  { NULL, kpidNumCyls, VT_UI4},
+  { NULL, kpidNumHeads, VT_UI4},
+  { NULL, kpidSectorsPerTrack, VT_UI4}
+  */
+};
+
+IMP_IInArchive_Props
+IMP_IInArchive_ArcProps_WITH_NAME
+
+// VHD start time: 2000-01-01
+static const UInt64 kVhdTimeStartValue = (UInt64)3600 * 24 * (399 * 365 + 24 * 4);
+
+static void VhdTimeToFileTime(UInt32 vhdTime, NCOM::CPropVariant &prop)
+{
+  FILETIME ft, utc;
+  UInt64 v = (kVhdTimeStartValue + vhdTime) * 10000000;
+  ft.dwLowDateTime = (DWORD)v;
+  ft.dwHighDateTime = (DWORD)(v >> 32);
+  // specification says that it's UTC time, but Virtual PC 6 writes local time. Why?
+  LocalFileTimeToFileTime(&ft, &utc);
+  prop = utc;
+}
+
+static void StringToAString(char *dest, UInt32 s)
+{
+  for (int i = 24; i >= 0; i -= 8)
+  {
+    Byte b = (Byte)((s >> i) & 0xFF);
+    if (b < 0x20 || b > 0x7F)
+      break;
+    *dest++ = b;
+  }
+  *dest = 0;
+}
+
+static void ConvertByteToHex(unsigned value, char *s)
+{
+  for (int i = 0; i < 2; i++)
+  {
+    unsigned t = value & 0xF;
+    value >>= 4;
+    s[1 - i] = (char)((t < 10) ? ('0' + t) : ('A' + (t - 10)));
+  }
+}
+
+STDMETHODIMP CHandler::GetArchiveProperty(PROPID propID, PROPVARIANT *value)
+{
+  COM_TRY_BEGIN
+  NCOM::CPropVariant prop;
+  switch(propID)
+  {
+    case kpidMainSubfile: prop = (UInt32)0; break;
+    case kpidCTime: VhdTimeToFileTime(Footer.CTime, prop); break;
+    case kpidClusterSize: if (Footer.ThereIsDynamic()) prop = (UInt32)1 << Dyn.BlockSizeLog; break;
+    case kpidMethod:
+    {
+      AString s = Footer.GetTypeString();
+      if (NeedParent())
+      {
+        s += " -> ";
+        const CHandler *p = this;
+        while (p != 0 && p->NeedParent())
+          p = p->Parent;
+        if (p == 0)
+          s += '?';
+        else
+          s += p->Footer.GetTypeString();
+      }
+      prop = s;
+      break;
+    }
+    case kpidCreatorApp:
+    {
+      char s[16];
+      StringToAString(s, Footer.CreatorApp);
+      AString res = s;
+      res.Trim();
+      ConvertUInt32ToString(Footer.CreatorVersion >> 16, s);
+      res += ' ';
+      res += s;
+      res += '.';
+      ConvertUInt32ToString(Footer.CreatorVersion & 0xFFFF, s);
+      res += s;
+      prop = res;
+      break;
+    }
+    case kpidHostOS:
+    {
+      if (Footer.CreatorHostOS == 0x5769326b)
+        prop = "Windows";
+      else
+      {
+        char s[16];
+        StringToAString(s, Footer.CreatorHostOS);
+        prop = s;
+      }
+      break;
+    }
+    case kpidId:
+    {
+      char s[32 + 4];
+      for (int i = 0; i < 16; i++)
+        ConvertByteToHex(Footer.Id[i], s + i * 2);
+      s[32] = 0;
+      prop = s;
+      break;
+    }
+    case kpidSavedState: prop = Footer.SavedState ? true : false; break;
+    case kpidParent: if (NeedParent()) prop = GetParentName(); break;
+  }
+  prop.Detach(value);
+  return S_OK;
+  COM_TRY_END
+}
+
+HRESULT CHandler::Open2(IInStream *stream, CHandler *child, IArchiveOpenCallback *openArchiveCallback, int level)
+{
+  Close();
+  Stream = stream;
+  if (level > 32)
+    return S_FALSE;
+  RINOK(Open3());
+  if (child && memcmp(child->Dyn.ParentId, Footer.Id, 16) != 0)
+    return S_FALSE;
+  if (Footer.Type != kDiskType_Diff)
+    return S_OK;
+  CMyComPtr<IArchiveOpenVolumeCallback> openVolumeCallback;
+  if (openArchiveCallback->QueryInterface(IID_IArchiveOpenVolumeCallback, (void **)&openVolumeCallback) != S_OK)
+    return S_FALSE;
+  CMyComPtr<IInStream> nextStream;
+  HRESULT res = openVolumeCallback->GetStream(Dyn.ParentName, &nextStream);
+  if (res == S_FALSE)
+    return S_OK;
+  RINOK(res);
+
+  Parent = new CHandler;
+  ParentStream = Parent;
+  return Parent->Open2(nextStream, this, openArchiveCallback, level + 1);
+}
+
+STDMETHODIMP CHandler::Open(IInStream *stream,
+    const UInt64 * /* maxCheckStartPosition */,
+    IArchiveOpenCallback * openArchiveCallback)
+{
+  COM_TRY_BEGIN
+  {
+    HRESULT res;
+    try
+    {
+      res = Open2(stream, NULL, openArchiveCallback, 0);
+      if (res == S_OK)
+        return S_OK;
+    }
+    catch(...)
+    {
+      Close();
+      throw;
+    }
+    Close();
+    return res;
+  }
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::Close()
+{
+  Bat.Clear();
+  NumUsedBlocks = 0;
+  Parent = 0;
+  Stream.Release();
+  ParentStream.Release();
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems)
+{
+  *numItems = 1;
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetProperty(UInt32 /* index */, PROPID propID, PROPVARIANT *value)
+{
+  COM_TRY_BEGIN
+  NWindows::NCOM::CPropVariant prop;
+
+  switch(propID)
+  {
+    case kpidSize: prop = GetSize(); break;
+    case kpidPackSize: prop = GetPackSize(); break;
+    case kpidCTime: VhdTimeToFileTime(Footer.CTime, prop); break;
+    /*
+    case kpidNumCyls: prop = Footer.NumCyls(); break;
+    case kpidNumHeads: prop = Footer.NumHeads(); break;
+    case kpidSectorsPerTrack: prop = Footer.NumSectorsPerTrack(); break;
+    */
+  }
+  prop.Detach(value);
+  return S_OK;
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::Extract(const UInt32* indices, UInt32 numItems,
+    Int32 _aTestMode, IArchiveExtractCallback *extractCallback)
+{
+  COM_TRY_BEGIN
+  if (numItems == UInt32(-1))
+    numItems = 1;
+  if (numItems == 0)
+    return S_OK;
+  if (numItems != 1 || indices[0] != 0)
+    return E_INVALIDARG;
+
+  bool testMode = (_aTestMode != 0);
+
+  RINOK(extractCallback->SetTotal(GetSize()));
+  CMyComPtr<ISequentialOutStream> outStream;
+  Int32 askMode = testMode ?
+      NArchive::NExtract::NAskMode::kTest :
+      NArchive::NExtract::NAskMode::kExtract;
+  RINOK(extractCallback->GetStream(0, &outStream, askMode));
+  if (!testMode && !outStream)
+    return S_OK;
+  RINOK(extractCallback->PrepareOperation(askMode));
+
+  NCompress::CCopyCoder *copyCoderSpec = new NCompress::CCopyCoder();
+  CMyComPtr<ICompressCoder> copyCoder = copyCoderSpec;
+
+  CLocalProgress *lps = new CLocalProgress;
+  CMyComPtr<ICompressProgressInfo> progress = lps;
+  lps->Init(extractCallback, false);
+
+  int res = NArchive::NExtract::NOperationResult::kDataError;
+  CMyComPtr<ISequentialInStream> inStream;
+  HRESULT hres = GetStream(0, &inStream);
+  if (hres == S_FALSE)
+    res = NArchive::NExtract::NOperationResult::kUnSupportedMethod;
+  else
+  {
+    RINOK(hres);
+    HRESULT hres = copyCoder->Code(inStream, outStream, NULL, NULL, progress);
+    if (hres == S_OK)
+    {
+      if (copyCoderSpec->TotalSize == GetSize())
+        res = NArchive::NExtract::NOperationResult::kOK;
+    }
+    else
+    {
+      if (hres != S_FALSE)
+      {
+        RINOK(hres);
+      }
+    }
+  }
+  outStream.Release();
+  return extractCallback->SetOperationResult(res);
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::GetStream(UInt32 /* index */, ISequentialInStream **stream)
+{
+  COM_TRY_BEGIN
+  *stream = 0;
+  if (Footer.IsFixed())
+  {
+    CLimitedInStream *streamSpec = new CLimitedInStream;
+    CMyComPtr<ISequentialInStream> streamTemp = streamSpec;
+    streamSpec->SetStream(Stream);
+    streamSpec->InitAndSeek(0, GetSize());
+    RINOK(streamSpec->SeekToStart());
+    *stream = streamTemp.Detach();
+    return S_OK;
+  }
+  if (!Footer.ThereIsDynamic() || !IsOK())
+    return S_FALSE;
+  CMyComPtr<ISequentialInStream> streamTemp = this;
+  RINOK(InitAndSeek());
+  *stream = streamTemp.Detach();
+  return S_OK;
+  COM_TRY_END
+}
+
+static IInArchive *CreateArc() { return new CHandler;  }
+
+static CArcInfo g_ArcInfo =
+  { L"VHD", L"vhd", L".mbr", 0xDC, { 'c', 'o', 'n', 'e', 'c', 't', 'i', 'x', 0, 0 }, 10, false, CreateArc, 0 };
+
+REGISTER_ARC(Vhd)
+
+}}