4.44 beta

2025-12-06 23:14:54 -06:00 · 2007-01-20 00:00:00 +00:00
parent 804edc5756
commit d9666cf046
1331 changed files with 10535 additions and 13791 deletions
--- a/CPP/7zip/Archive/Cab/CabHandler.cpp
+++ b/CPP/7zip/Archive/Cab/CabHandler.cpp
@@ -0,0 +1,812 @@
+// CabHandler.cpp
+
+#include "StdAfx.h"
+
+#include "Common/StringConvert.h"
+#include "Common/Defs.h"
+#include "Common/Alloc.h"
+#include "Common/UTFConvert.h"
+#include "Common/ComTry.h"
+#include "Common/IntToString.h"
+
+#include "Windows/PropVariant.h"
+#include "Windows/Time.h"
+
+#include "CabHandler.h"
+#include "CabBlockInStream.h"
+
+#include "../../Compress/Copy/CopyCoder.h"
+#include "../../Compress/Deflate/DeflateDecoder.h"
+#include "../../Compress/Lzx/LzxDecoder.h"
+#include "../../Compress/Quantum/QuantumDecoder.h"
+
+#include "../Common/ItemNameUtils.h"
+
+using namespace NWindows;
+
+namespace NArchive {
+namespace NCab {
+
+// #define _CAB_DETAILS
+
+#ifdef _CAB_DETAILS
+enum 
+{
+  kpidBlockReal = kpidUserDefined,
+  kpidOffset,
+  kpidVolume,
+};
+#endif
+
+STATPROPSTG kProperties[] = 
+{
+  { NULL, kpidPath, VT_BSTR},
+  // { NULL, kpidIsFolder, VT_BOOL},
+  { NULL, kpidSize, VT_UI8},
+  { NULL, kpidLastWriteTime, VT_FILETIME},
+  { NULL, kpidAttributes, VT_UI4},
+  { NULL, kpidMethod, VT_BSTR},
+  { NULL, kpidBlock, VT_I4}
+  #ifdef _CAB_DETAILS
+  ,
+  { L"BlockReal", kpidBlockReal, VT_UI4},
+  { L"Offset", kpidOffset, VT_UI4},
+  { L"Volume", kpidVolume, VT_UI4}
+  #endif
+};
+
+static const int kNumProperties = sizeof(kProperties) / sizeof(kProperties[0]);
+
+static const wchar_t *kMethods[] = 
+{
+  L"None",
+  L"MSZip",
+  L"Quantum",
+  L"LZX"
+};
+
+static const int kNumMethods = sizeof(kMethods) / sizeof(kMethods[0]);
+static const wchar_t *kUnknownMethod = L"Unknown";
+
+STDMETHODIMP CHandler::GetArchiveProperty(PROPID /* propID */, PROPVARIANT *value)
+{
+  value->vt = VT_EMPTY;
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetNumberOfProperties(UInt32 *numProperties)
+{
+  *numProperties = sizeof(kProperties) / sizeof(kProperties[0]);
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetPropertyInfo(UInt32 index,     
+      BSTR *name, PROPID *propID, VARTYPE *varType)
+{
+  if(index >= sizeof(kProperties) / sizeof(kProperties[0]))
+    return E_INVALIDARG;
+  const STATPROPSTG &srcItem = kProperties[index];
+  *propID = srcItem.propid;
+  *varType = srcItem.vt;
+  if (srcItem.lpwstrName == 0)
+    *name = 0;
+  else
+    *name = ::SysAllocString(srcItem.lpwstrName);
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetNumberOfArchiveProperties(UInt32 *numProperties)
+{
+  *numProperties = 0;
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetArchivePropertyInfo(UInt32 /* index */,     
+      BSTR * /* name */, PROPID * /* propID */, VARTYPE * /* varType */)
+{
+  return E_INVALIDARG;
+}
+
+STDMETHODIMP CHandler::GetProperty(UInt32 index, PROPID propID,  PROPVARIANT *value)
+{
+  COM_TRY_BEGIN
+  NWindows::NCOM::CPropVariant propVariant;
+  
+  const CMvItem &mvItem = m_Database.Items[index];
+  const CDatabaseEx &db = m_Database.Volumes[mvItem.VolumeIndex];
+  int itemIndex = mvItem.ItemIndex;
+  const CItem &item = db.Items[itemIndex];
+  switch(propID)
+  {
+    case kpidPath:
+    {
+      UString unicodeName;
+      if (item.IsNameUTF())
+        ConvertUTF8ToUnicode(item.Name, unicodeName);
+      else
+        unicodeName = MultiByteToUnicodeString(item.Name, CP_ACP);
+      propVariant = (const wchar_t *)NItemName::WinNameToOSName(unicodeName);
+      break;
+    }
+    case kpidIsFolder:
+      propVariant = item.IsDirectory();
+      break;
+    case kpidSize:
+      propVariant = item.Size;
+      break;
+    case kpidLastWriteTime:
+    {
+      FILETIME localFileTime, utcFileTime;
+      if (NTime::DosTimeToFileTime(item.Time, localFileTime))
+      {
+        if (!LocalFileTimeToFileTime(&localFileTime, &utcFileTime))
+          utcFileTime.dwHighDateTime = utcFileTime.dwLowDateTime = 0;
+      }
+      else
+        utcFileTime.dwHighDateTime = utcFileTime.dwLowDateTime = 0;
+      propVariant = utcFileTime;
+      break;
+    }
+    case kpidAttributes:
+      propVariant = item.GetWinAttributes();
+      break;
+
+    case kpidMethod:
+    {
+      UInt32 realFolderIndex = item.GetFolderIndex(db.Folders.Size());
+      const CFolder &folder = db.Folders[realFolderIndex];
+      int methodIndex = folder.GetCompressionMethod();
+      UString method = (methodIndex < kNumMethods) ? kMethods[methodIndex] : kUnknownMethod;
+      if (methodIndex == NHeader::NCompressionMethodMajor::kLZX || 
+        methodIndex == NHeader::NCompressionMethodMajor::kQuantum)
+      {
+        method += L":";
+        wchar_t temp[32];
+        ConvertUInt64ToString(folder.CompressionTypeMinor, temp);
+        method += temp;
+      }
+      propVariant = method;
+      break;
+    }
+    case kpidBlock:
+      propVariant = (Int32)m_Database.GetFolderIndex(&mvItem);
+      break;
+    
+    #ifdef _CAB_DETAILS
+    
+    case kpidBlockReal:
+      propVariant = UInt32(item.FolderIndex);
+      break;
+    case kpidOffset:
+      propVariant = (UInt32)item.Offset;
+      break;
+    case kpidVolume:
+      propVariant = (UInt32)mvItem.VolumeIndex;
+      break;
+    
+    #endif
+  }
+  propVariant.Detach(value);
+  return S_OK;
+  COM_TRY_END
+}
+
+/*
+class CPropgressImp: public CProgressVirt
+{
+  CMyComPtr<IArchiveOpenCallback> m_OpenArchiveCallback;
+public:
+  STDMETHOD(SetTotal)(const UInt64 *numFiles);
+  STDMETHOD(SetCompleted)(const UInt64 *numFiles);
+  void Init(IArchiveOpenCallback *openArchiveCallback)
+    { m_OpenArchiveCallback = openArchiveCallback; }
+};
+
+STDMETHODIMP CPropgressImp::SetTotal(const UInt64 *numFiles)
+{
+  if (m_OpenArchiveCallback)
+    return m_OpenArchiveCallback->SetCompleted(numFiles, NULL);
+  return S_OK;
+}
+
+STDMETHODIMP CPropgressImp::SetCompleted(const UInt64 *numFiles)
+{
+  if (m_OpenArchiveCallback)
+    return m_OpenArchiveCallback->SetCompleted(numFiles, NULL);
+  return S_OK;
+}
+*/
+
+STDMETHODIMP CHandler::Open(IInStream *inStream, 
+    const UInt64 *maxCheckStartPosition,
+    IArchiveOpenCallback *openArchiveCallback)
+{
+  COM_TRY_BEGIN
+  Close();
+  HRESULT res = S_FALSE;
+  CInArchive archive;
+  CMyComPtr<IArchiveOpenVolumeCallback> openVolumeCallback;
+  {
+    CMyComPtr<IArchiveOpenCallback> openArchiveCallbackWrap = openArchiveCallback;
+    openArchiveCallbackWrap.QueryInterface(IID_IArchiveOpenVolumeCallback, &openVolumeCallback);
+  }
+
+  CMyComPtr<IInStream> nextStream = inStream;
+  bool prevChecked = false;
+  UInt64 numItems = 0;
+  try
+  {
+    while(nextStream != 0)
+    {
+      CDatabaseEx db;
+      db.Stream = nextStream;
+      res = archive.Open(maxCheckStartPosition, db);
+      if (res == S_OK)
+      {
+        if (!m_Database.Volumes.IsEmpty())
+        {
+          const CDatabaseEx &dbPrev = m_Database.Volumes[prevChecked ? m_Database.Volumes.Size() - 1 : 0];
+          if (dbPrev.ArchiveInfo.SetID != db.ArchiveInfo.SetID ||
+              dbPrev.ArchiveInfo.CabinetNumber + (prevChecked ? 1: - 1) != 
+              db.ArchiveInfo.CabinetNumber)
+            res = S_FALSE;
+        }
+      }
+      if (res == S_OK)
+        m_Database.Volumes.Insert(prevChecked ? m_Database.Volumes.Size() : 0, db);
+      else if (res != S_FALSE)
+        return res;
+      else 
+      {
+        if (m_Database.Volumes.IsEmpty())
+          return S_FALSE;
+        if (prevChecked)
+          break;
+        prevChecked = true;
+      }
+
+      numItems += db.Items.Size();
+      RINOK(openArchiveCallback->SetCompleted(&numItems, NULL));
+        
+      nextStream = 0;
+      for (;;)
+      {
+        const COtherArchive *otherArchive = 0;
+        if (!prevChecked)
+        {
+          const CInArchiveInfo &ai = m_Database.Volumes.Front().ArchiveInfo;
+          if (ai.IsTherePrev())
+            otherArchive = &ai.PreviousArchive;
+          else
+            prevChecked = true;
+        }
+        if (otherArchive == 0)
+        {
+          const CInArchiveInfo &ai = m_Database.Volumes.Back().ArchiveInfo;
+          if (ai.IsThereNext())
+            otherArchive = &ai.NextArchive;
+        }
+        if (!otherArchive)
+          break;
+        const UString fullName = MultiByteToUnicodeString(otherArchive->FileName, CP_ACP);
+        HRESULT result = openVolumeCallback->GetStream(fullName, &nextStream);
+        if (result == S_OK)
+          break;
+        if (result != S_FALSE)
+          return result;
+        if (prevChecked)
+          break;
+        prevChecked = true;
+      }
+    }
+    if (res == S_OK)
+    {
+      m_Database.FillSortAndShrink();
+      if (!m_Database.Check())
+        res = S_FALSE;
+    }
+  }
+  catch(...)
+  {
+    res = S_FALSE;
+  }
+  if (res != S_OK)
+  {
+    Close();
+    return res;
+  }
+  COM_TRY_END
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::Close()
+{
+  m_Database.Clear();
+  return S_OK;
+}
+
+class CCabFolderOutStream: 
+  public ISequentialOutStream,
+  public CMyUnknownImp
+{
+public:
+  MY_UNKNOWN_IMP
+
+  STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize);
+private:
+  const CMvDatabaseEx *m_Database;
+  const CRecordVector<bool> *m_ExtractStatuses;
+  int m_StartIndex;
+  int m_CurrentIndex;
+  CMyComPtr<IArchiveExtractCallback> m_ExtractCallback;
+  bool m_TestMode;
+
+  CMyComPtr<ISequentialOutStream> m_RealOutStream;
+
+  bool m_IsOk;
+  bool m_FileIsOpen;
+  UInt64 m_RemainFileSize;
+  UInt64 m_FolderSize;
+  UInt64 m_PosInFolder;
+
+  HRESULT OpenFile();
+  HRESULT Write2(const void *data, UInt32 size, UInt32 *processedSize, bool isOK);
+public:
+  HRESULT WriteEmptyFiles();
+
+  void Init(
+      const CMvDatabaseEx *database,
+      const CRecordVector<bool> *extractStatuses, 
+      int startIndex, 
+      UInt64 folderSize,
+      IArchiveExtractCallback *extractCallback,
+      bool testMode);
+  HRESULT FlushCorrupted();
+  HRESULT Unsupported();
+
+  UInt64 GetRemain() const { return m_FolderSize - m_PosInFolder; }
+  UInt64 GetPosInFolder() const { return m_PosInFolder; }
+};
+
+void CCabFolderOutStream::Init(
+    const CMvDatabaseEx *database,
+    const CRecordVector<bool> *extractStatuses, 
+    int startIndex, 
+    UInt64 folderSize,
+    IArchiveExtractCallback *extractCallback,
+    bool testMode)
+{
+  m_Database = database;
+  m_ExtractStatuses = extractStatuses;
+  m_StartIndex = startIndex;
+  m_FolderSize = folderSize;
+
+  m_ExtractCallback = extractCallback;
+  m_TestMode = testMode;
+
+  m_CurrentIndex = 0;
+  m_PosInFolder = 0;
+  m_FileIsOpen = false;
+  m_IsOk = true;
+}
+
+HRESULT CCabFolderOutStream::OpenFile()
+{
+  Int32 askMode = (*m_ExtractStatuses)[m_CurrentIndex] ? (m_TestMode ? 
+      NExtract::NAskMode::kTest :
+      NExtract::NAskMode::kExtract) :
+      NExtract::NAskMode::kSkip;
+  RINOK(m_ExtractCallback->GetStream(m_StartIndex + m_CurrentIndex, &m_RealOutStream, askMode));
+  if (!m_RealOutStream && !m_TestMode)
+    askMode = NArchive::NExtract::NAskMode::kSkip;
+  return m_ExtractCallback->PrepareOperation(askMode);
+}
+
+HRESULT CCabFolderOutStream::WriteEmptyFiles()
+{
+  if (m_FileIsOpen)
+    return S_OK;
+  for(;m_CurrentIndex < m_ExtractStatuses->Size(); m_CurrentIndex++)
+  {
+    const CMvItem &mvItem = m_Database->Items[m_StartIndex + m_CurrentIndex];
+    const CItem &item = m_Database->Volumes[mvItem.VolumeIndex].Items[mvItem.ItemIndex];
+    UInt64 fileSize = item.Size;
+    if (fileSize != 0)
+      return S_OK;
+    HRESULT result = OpenFile();
+    m_RealOutStream.Release();
+    RINOK(result);
+    RINOK(m_ExtractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kOK));
+  }
+  return S_OK;
+}
+
+// This is Write function
+HRESULT CCabFolderOutStream::Write2(const void *data, UInt32 size, UInt32 *processedSize, bool isOK)
+{
+  UInt32 realProcessed = 0;
+  if (processedSize != NULL)
+   *processedSize = 0;
+  while(size != 0)
+  {
+    if (m_FileIsOpen)
+    {
+      UInt32 numBytesToWrite = (UInt32)MyMin(m_RemainFileSize, (UInt64)(size));
+      HRESULT res = S_OK;
+      if (numBytesToWrite > 0)
+      {
+        if (!isOK)
+          m_IsOk = false;
+        if (m_RealOutStream)
+        {
+          UInt32 processedSizeLocal = 0;
+          res = m_RealOutStream->Write((const Byte *)data, numBytesToWrite, &processedSizeLocal);
+          numBytesToWrite = processedSizeLocal;
+        }
+      }
+      realProcessed += numBytesToWrite;
+      if (processedSize != NULL)
+        *processedSize = realProcessed;
+      data = (const void *)((const Byte *)data + numBytesToWrite);
+      size -= numBytesToWrite;
+      m_RemainFileSize -= numBytesToWrite;
+      m_PosInFolder += numBytesToWrite;
+      if (res != S_OK)
+        return res;
+      if (m_RemainFileSize == 0)
+      {
+        m_RealOutStream.Release();
+        RINOK(m_ExtractCallback->SetOperationResult(
+          m_IsOk ? 
+            NArchive::NExtract::NOperationResult::kOK:
+            NArchive::NExtract::NOperationResult::kDataError));
+        m_FileIsOpen = false;
+      }
+      if (realProcessed > 0)
+        break; // with this break this function works as Write-Part
+    }
+    else
+    {
+      if (m_CurrentIndex >= m_ExtractStatuses->Size())
+        return E_FAIL;
+
+      const CMvItem &mvItem = m_Database->Items[m_StartIndex + m_CurrentIndex];
+      const CItem &item = m_Database->Volumes[mvItem.VolumeIndex].Items[mvItem.ItemIndex];
+
+      m_RemainFileSize = item.Size;
+
+      UInt32 fileOffset = item.Offset;
+      if (fileOffset < m_PosInFolder)
+        return E_FAIL;
+      if (fileOffset > m_PosInFolder)
+      {
+        UInt32 numBytesToWrite = (UInt32)MyMin((UInt64)fileOffset - m_PosInFolder, UInt64(size));
+        realProcessed += numBytesToWrite;
+        if (processedSize != NULL)
+          *processedSize = realProcessed;
+        data = (const void *)((const Byte *)data + numBytesToWrite);
+        size -= numBytesToWrite;
+        m_PosInFolder += numBytesToWrite;
+      }
+      if (fileOffset == m_PosInFolder)
+      {
+        RINOK(OpenFile());
+        m_FileIsOpen = true;
+        m_CurrentIndex++;
+        m_IsOk = true;
+      }
+    }
+  }
+  return WriteEmptyFiles();
+}
+
+STDMETHODIMP CCabFolderOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
+{
+  return Write2(data, size, processedSize, true);
+}
+
+HRESULT CCabFolderOutStream::FlushCorrupted()
+{
+  const UInt32 kBufferSize = (1 << 10);
+  Byte buffer[kBufferSize];
+  for (int i = 0; i < kBufferSize; i++)
+    buffer[i] = 0;
+  for (;;)
+  {
+    UInt64 remain = GetRemain();
+    if (remain == 0)
+      return S_OK;
+    UInt32 size = (UInt32)MyMin(remain, (UInt64)kBufferSize);
+    UInt32 processedSizeLocal = 0;
+    RINOK(Write2(buffer, size, &processedSizeLocal, false));
+  }
+}
+
+HRESULT CCabFolderOutStream::Unsupported()
+{
+  while(m_CurrentIndex < m_ExtractStatuses->Size())
+  {
+    HRESULT result = OpenFile();
+    if (result != S_FALSE && result != S_OK)
+      return result;
+    m_RealOutStream.Release();
+    RINOK(m_ExtractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kUnSupportedMethod));
+    m_CurrentIndex++;
+  }
+  return S_OK;
+}
+
+
+STDMETHODIMP CHandler::Extract(const UInt32* indices, UInt32 numItems,
+    Int32 _aTestMode, IArchiveExtractCallback *extractCallback)
+{
+  COM_TRY_BEGIN
+  bool allFilesMode = (numItems == (UInt32)(-1));
+  if (allFilesMode)
+    numItems = m_Database.Items.Size();
+  if(numItems == 0)
+    return S_OK;
+  bool testMode = (_aTestMode != 0);
+  UInt64 totalUnPacked = 0;
+
+  UInt32 i;
+  int lastFolder = -2;
+  UInt64 lastFolderSize = 0;
+  for(i = 0; i < numItems; i++)
+  {
+    int index = allFilesMode ? i : indices[i];
+    const CMvItem &mvItem = m_Database.Items[index];
+    const CItem &item = m_Database.Volumes[mvItem.VolumeIndex].Items[mvItem.ItemIndex];
+    if (item.IsDirectory())
+      continue;
+    int folderIndex = m_Database.GetFolderIndex(&mvItem);
+    if (folderIndex != lastFolder)
+      totalUnPacked += lastFolderSize;
+    lastFolder = folderIndex;
+    lastFolderSize = item.GetEndOffset();
+  }
+  totalUnPacked += lastFolderSize;
+
+  extractCallback->SetTotal(totalUnPacked);
+
+  totalUnPacked = 0;
+
+  NCompress::CCopyCoder *copyCoderSpec = NULL;
+  CMyComPtr<ICompressCoder> copyCoder;
+
+  NCompress::NDeflate::NDecoder::CCOMCoder *deflateDecoderSpec = NULL;
+  CMyComPtr<ICompressCoder> deflateDecoder;
+
+  NCompress::NLzx::CDecoder *lzxDecoderSpec = NULL;
+  CMyComPtr<ICompressCoder> lzxDecoder;
+
+  NCompress::NQuantum::CDecoder *quantumDecoderSpec = NULL;
+  CMyComPtr<ICompressCoder> quantumDecoder;
+
+  CCabBlockInStream *cabBlockInStreamSpec = new CCabBlockInStream();
+  CMyComPtr<ISequentialInStream> cabBlockInStream = cabBlockInStreamSpec;
+  if (!cabBlockInStreamSpec->Create())
+    return E_OUTOFMEMORY;
+
+  CRecordVector<bool> extractStatuses;
+  for(i = 0; i < numItems;)
+  {
+    int index = allFilesMode ? i : indices[i];
+
+    const CMvItem &mvItem = m_Database.Items[index];
+    const CDatabaseEx &db = m_Database.Volumes[mvItem.VolumeIndex];
+    int itemIndex = mvItem.ItemIndex;
+    const CItem &item = db.Items[itemIndex];
+
+    i++;
+    if (item.IsDirectory())
+    {
+      Int32 askMode= testMode ? 
+          NArchive::NExtract::NAskMode::kTest :
+          NArchive::NExtract::NAskMode::kExtract;
+      CMyComPtr<ISequentialOutStream> realOutStream;
+      RINOK(extractCallback->GetStream(index, &realOutStream, askMode));
+      RINOK(extractCallback->PrepareOperation(askMode));
+      realOutStream.Release();
+      RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kOK));
+      continue;
+    }
+    int folderIndex = m_Database.GetFolderIndex(&mvItem);
+    if (folderIndex < 0)
+    {
+      // If we need previous archive
+      Int32 askMode= testMode ? 
+          NArchive::NExtract::NAskMode::kTest :
+          NArchive::NExtract::NAskMode::kExtract;
+      CMyComPtr<ISequentialOutStream> realOutStream;
+      RINOK(extractCallback->GetStream(index, &realOutStream, askMode));
+      RINOK(extractCallback->PrepareOperation(askMode));
+      realOutStream.Release();
+      RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kDataError));
+      continue;
+    }
+    int startIndex2 = m_Database.FolderStartFileIndex[folderIndex];
+    int startIndex = startIndex2;
+    extractStatuses.Clear();
+    for (; startIndex < index; startIndex++)
+      extractStatuses.Add(false);
+    extractStatuses.Add(true);
+    startIndex++;
+    UInt64 curUnpack = item.GetEndOffset();
+    for(;i < numItems; i++)
+    {
+      int indexNext = allFilesMode ? i : indices[i];
+      const CMvItem &mvItem = m_Database.Items[indexNext];
+      const CItem &item = m_Database.Volumes[mvItem.VolumeIndex].Items[mvItem.ItemIndex];
+      if (item.IsDirectory())
+        continue;
+      int newFolderIndex = m_Database.GetFolderIndex(&mvItem);
+
+      if (newFolderIndex != folderIndex)
+        break;
+      for (; startIndex < indexNext; startIndex++)
+        extractStatuses.Add(false);
+      extractStatuses.Add(true);
+      startIndex++;
+      curUnpack = item.GetEndOffset();
+    }
+
+    RINOK(extractCallback->SetCompleted(&totalUnPacked));
+    
+    CCabFolderOutStream *cabFolderOutStream = new CCabFolderOutStream;
+    CMyComPtr<ISequentialOutStream> outStream(cabFolderOutStream);
+
+    const CFolder &folder = db.Folders[item.GetFolderIndex(db.Folders.Size())];
+
+    cabFolderOutStream->Init(&m_Database, &extractStatuses, startIndex2, 
+        curUnpack, extractCallback, testMode);
+
+    cabBlockInStreamSpec->MsZip = false;
+    switch(folder.GetCompressionMethod())
+    {
+      case NHeader::NCompressionMethodMajor::kNone:
+        if(copyCoderSpec == NULL)
+        {
+          copyCoderSpec = new NCompress::CCopyCoder;
+          copyCoder = copyCoderSpec;
+        }
+        break;
+      case NHeader::NCompressionMethodMajor::kMSZip:
+        if(deflateDecoderSpec == NULL)
+        {
+          deflateDecoderSpec = new NCompress::NDeflate::NDecoder::CCOMCoder;
+          deflateDecoder = deflateDecoderSpec;
+        }
+        cabBlockInStreamSpec->MsZip = true;
+        break;
+      case NHeader::NCompressionMethodMajor::kLZX:
+        if(lzxDecoderSpec == NULL)
+        {
+          lzxDecoderSpec = new NCompress::NLzx::CDecoder;
+          lzxDecoder = lzxDecoderSpec;
+        }
+        RINOK(lzxDecoderSpec->SetParams(folder.CompressionTypeMinor));
+        break;
+      case NHeader::NCompressionMethodMajor::kQuantum:
+        if(quantumDecoderSpec == NULL)
+        {
+          quantumDecoderSpec = new NCompress::NQuantum::CDecoder;
+          quantumDecoder = quantumDecoderSpec;
+        }
+        quantumDecoderSpec->SetParams(folder.CompressionTypeMinor);
+        break;
+      default:
+      {
+        RINOK(cabFolderOutStream->Unsupported());
+        totalUnPacked += curUnpack;
+        continue;
+      }
+    }
+
+    cabBlockInStreamSpec->InitForNewFolder();
+
+    HRESULT res = S_OK;
+
+    {
+      int volIndex = mvItem.VolumeIndex;
+      int locFolderIndex = item.GetFolderIndex(db.Folders.Size());
+      bool keepHistory = false;
+      bool keepInputBuffer = false;
+      for (UInt32 f = 0; cabFolderOutStream->GetRemain() != 0;)
+      {
+        if (volIndex >= m_Database.Volumes.Size())
+        {
+          res = S_FALSE;
+          break;
+        }
+
+        const CDatabaseEx &db = m_Database.Volumes[volIndex];
+        const CFolder &folder = db.Folders[locFolderIndex];
+        if (f == 0)
+        {
+          cabBlockInStreamSpec->SetStream(db.Stream);
+          cabBlockInStreamSpec->ReservedSize = db.ArchiveInfo.GetDataBlockReserveSize();
+          RINOK(db.Stream->Seek(db.StartPosition + folder.DataStart, STREAM_SEEK_SET, NULL));
+        }
+        if (f == folder.NumDataBlocks)
+        {
+          volIndex++;
+          locFolderIndex = 0;
+          f = 0;
+          continue;
+        }
+        f++;
+
+        cabBlockInStreamSpec->DataError = false;
+        
+        if (!keepInputBuffer)
+          cabBlockInStreamSpec->InitForNewBlock();
+
+        UInt32 packSize, unpackSize;
+        res = cabBlockInStreamSpec->PreRead(packSize, unpackSize);
+        if (res == S_FALSE)
+          break;
+        RINOK(res);
+        keepInputBuffer = (unpackSize == 0);
+        if (keepInputBuffer)
+          continue;
+
+
+        UInt64 totalUnPacked2 = totalUnPacked + cabFolderOutStream->GetPosInFolder();
+        RINOK(extractCallback->SetCompleted(&totalUnPacked2));
+        UInt64 unpackRemain = cabFolderOutStream->GetRemain();
+
+        const UInt32 kBlockSizeMax = (1 << 15);
+        if (unpackRemain > kBlockSizeMax)
+          unpackRemain = kBlockSizeMax;
+        if (unpackRemain > unpackSize)
+          unpackRemain  = unpackSize;
+   
+        switch(folder.GetCompressionMethod())
+        {
+          case NHeader::NCompressionMethodMajor::kNone:
+            res = copyCoder->Code(cabBlockInStream, outStream, NULL, &unpackRemain, NULL);
+            break;
+          case NHeader::NCompressionMethodMajor::kMSZip:
+            deflateDecoderSpec->SetKeepHistory(keepHistory);
+            res = deflateDecoder->Code(cabBlockInStream, outStream, NULL, &unpackRemain, NULL);
+            break;
+          case NHeader::NCompressionMethodMajor::kLZX:
+            lzxDecoderSpec->SetKeepHistory(keepHistory, cabBlockInStreamSpec->GetAlign());
+            res = lzxDecoder->Code(cabBlockInStream, outStream, NULL, &unpackRemain, NULL);
+            break;
+          case NHeader::NCompressionMethodMajor::kQuantum:
+            quantumDecoderSpec->SetKeepHistory(keepHistory);
+            res = quantumDecoder->Code(cabBlockInStream, outStream, NULL, &unpackRemain, NULL);
+          break;
+        }
+        if (res != S_OK)
+        {
+          if (res != S_FALSE)
+            RINOK(res);
+          break;
+        }
+        keepHistory = true;
+      }
+      if (res == S_OK)
+      {
+        RINOK(cabFolderOutStream->WriteEmptyFiles());
+      }
+    }
+    if (res != S_OK || cabFolderOutStream->GetRemain() != 0)
+    {
+      RINOK(cabFolderOutStream->FlushCorrupted());
+    }
+    totalUnPacked += curUnpack;
+  }
+  return S_OK;
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems)
+{
+  *numItems = m_Database.Items.Size();
+  return S_OK;
+}
+
+}}