rarhandler.cpp

7-Zip 是一款号称有着现今最高压缩比的压缩软件

        if (openArchiveCallback != NULL && _items.Size() % 100 == 0)
        {
          UInt64 numFiles = _items.Size();
          UInt64 numBytes = curBytes + item.Position;
          RINOK(openArchiveCallback->SetCompleted(&numFiles, &numBytes));
        }
      }
      curBytes += endPos;
      _archives.Add(archive);
    }
  }
  return S_OK;
}

STDMETHODIMP CHandler::Open(IInStream *stream,
    const UInt64 *maxCheckStartPosition,
    IArchiveOpenCallback *openArchiveCallback)
{
  COM_TRY_BEGIN
  Close();
  try
  {
    HRESULT res = Open2(stream, maxCheckStartPosition, openArchiveCallback);
    if (res != S_OK)
      Close();
    return res;
  }
  catch(const CInArchiveException &) { Close(); return S_FALSE; }
  catch(...) { Close(); throw; }
  COM_TRY_END
}

STDMETHODIMP CHandler::Close()
{
  COM_TRY_BEGIN
  _refItems.Clear();
  _items.Clear();
  _archives.Clear();
  return S_OK;
  COM_TRY_END
}

struct CMethodItem
{
  Byte RarUnPackVersion;
  CMyComPtr<ICompressCoder> Coder;
};


STDMETHODIMP CHandler::Extract(const UInt32* indices, UInt32 numItems,
    Int32 _aTestMode, IArchiveExtractCallback *_anExtractCallback)
{
  COM_TRY_BEGIN
  CMyComPtr<ICryptoGetTextPassword> getTextPassword;
  bool testMode = (_aTestMode != 0);
  CMyComPtr<IArchiveExtractCallback> extractCallback = _anExtractCallback;
  UInt64 censoredTotalUnPacked = 0,
        // censoredTotalPacked = 0,
        importantTotalUnPacked = 0;
        // importantTotalPacked = 0;
  bool allFilesMode = (numItems == UInt32(-1));
  if (allFilesMode)
    numItems = _refItems.Size();
  if(numItems == 0)
    return S_OK;
  int lastIndex = 0;
  CRecordVector<int> importantIndexes;
  CRecordVector<bool> extractStatuses;

  for(UInt32 t = 0; t < numItems; t++)
  {
    int index = allFilesMode ? t : indices[t];
    const CRefItem &refItem = _refItems[index];
    const CItemEx &item = _items[refItem.ItemIndex];
    censoredTotalUnPacked += item.Size;
    // censoredTotalPacked += item.PackSize;
    int j;
    for(j = lastIndex; j <= index; j++)
      // if(!_items[_refItems[j].ItemIndex].IsSolid())
      if(!IsSolid(j))
        lastIndex = j;
    for(j = lastIndex; j <= index; j++)
    {
      const CRefItem &refItem = _refItems[j];
      const CItemEx &item = _items[refItem.ItemIndex];

      // const CItemEx &item = _items[j];

      importantTotalUnPacked += item.Size;
      // importantTotalPacked += item.PackSize;
      importantIndexes.Add(j);
      extractStatuses.Add(j == index);
    }
    lastIndex = index + 1;
  }

  extractCallback->SetTotal(importantTotalUnPacked);
  UInt64 currentImportantTotalUnPacked = 0;
  UInt64 currentImportantTotalPacked = 0;
  UInt64 currentUnPackSize, currentPackSize;

  CObjectVector<CMethodItem> methodItems;

  NCompress::CCopyCoder *copyCoderSpec = new NCompress::CCopyCoder;
  CMyComPtr<ICompressCoder> copyCoder = copyCoderSpec;

  CFilterCoder *filterStreamSpec = new CFilterCoder;
  CMyComPtr<ISequentialInStream> filterStream = filterStreamSpec;

  NCrypto::NRar20::CDecoder *rar20CryptoDecoderSpec = NULL;
  CMyComPtr<ICompressFilter> rar20CryptoDecoder;
  NCrypto::NRar29::CDecoder *rar29CryptoDecoderSpec = NULL;
  CMyComPtr<ICompressFilter> rar29CryptoDecoder;

  CFolderInStream *folderInStreamSpec = NULL;
  CMyComPtr<ISequentialInStream> folderInStream;

  CLocalProgress *lps = new CLocalProgress;
  CMyComPtr<ICompressProgressInfo> progress = lps;
  lps->Init(extractCallback, false);

  bool solidStart = true;
  for(int i = 0; i < importantIndexes.Size(); i++,
      currentImportantTotalUnPacked += currentUnPackSize,
      currentImportantTotalPacked += currentPackSize)
  {
    lps->InSize = currentImportantTotalPacked;
    lps->OutSize = currentImportantTotalUnPacked;
    RINOK(lps->SetCur());
    CMyComPtr<ISequentialOutStream> realOutStream;

    Int32 askMode;
    if(extractStatuses[i])
      askMode = testMode ?
          NArchive::NExtract::NAskMode::kTest :
          NArchive::NExtract::NAskMode::kExtract;
    else
      askMode = NArchive::NExtract::NAskMode::kSkip;

    UInt32 index = importantIndexes[i];

    const CRefItem &refItem = _refItems[index];
    const CItemEx &item = _items[refItem.ItemIndex];

    currentUnPackSize = item.Size;

    currentPackSize = GetPackSize(index);

    if(item.IgnoreItem())
      continue;

    RINOK(extractCallback->GetStream(index, &realOutStream, askMode));

    if (!IsSolid(index))
      solidStart = true;
    if(item.IsDir())
    {
      RINOK(extractCallback->PrepareOperation(askMode));
      RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kOK));
      continue;
    }

    bool mustBeProcessedAnywhere = false;
    if(i < importantIndexes.Size() - 1)
    {
      // const CRefItem &nextRefItem = _refItems[importantIndexes[i + 1]];
      // const CItemEx &nextItemInfo = _items[nextRefItem.ItemIndex];
      // mustBeProcessedAnywhere = nextItemInfo.IsSolid();
      mustBeProcessedAnywhere = IsSolid(importantIndexes[i + 1]);
    }
    
    if (!mustBeProcessedAnywhere && !testMode && !realOutStream)
      continue;
    
    if (!realOutStream && !testMode)
      askMode = NArchive::NExtract::NAskMode::kSkip;

    RINOK(extractCallback->PrepareOperation(askMode));

    COutStreamWithCRC *outStreamSpec = new COutStreamWithCRC;
    CMyComPtr<ISequentialOutStream> outStream(outStreamSpec);
    outStreamSpec->SetStream(realOutStream);
    outStreamSpec->Init();
    realOutStream.Release();
    
    /*
    for (int partIndex = 0; partIndex < 1; partIndex++)
    {
    CMyComPtr<ISequentialInStream> inStream;

    // item redefinition
    const CItemEx &item = _items[refItem.ItemIndex + partIndex];

    NArchive::NRar::CInArchive &archive = _archives[refItem.VolumeIndex + partIndex];

    inStream.Attach(archive.CreateLimitedStream(item.GetDataPosition(),
      item.PackSize));
    */
    if (!folderInStream)
    {
      folderInStreamSpec = new CFolderInStream;
      folderInStream = folderInStreamSpec;
    }

    folderInStreamSpec->Init(&_archives, &_items, refItem);

    UInt64 packSize = currentPackSize;

    // packedPos += item.PackSize;
    // unpackedPos += 0;
    
    CMyComPtr<ISequentialInStream> inStream;
    if (item.IsEncrypted())
    {
      CMyComPtr<ICryptoSetPassword> cryptoSetPassword;
      if (item.UnPackVersion >= 29)
      {
        if (!rar29CryptoDecoder)
        {
          rar29CryptoDecoderSpec = new NCrypto::NRar29::CDecoder;
          rar29CryptoDecoder = rar29CryptoDecoderSpec;
          // RINOK(rar29CryptoDecoder.CoCreateInstance(CLSID_CCryptoRar29Decoder));
        }
        rar29CryptoDecoderSpec->SetRar350Mode(item.UnPackVersion < 36);
        CMyComPtr<ICompressSetDecoderProperties2> cryptoProperties;
        RINOK(rar29CryptoDecoder.QueryInterface(IID_ICompressSetDecoderProperties2,
            &cryptoProperties));
        RINOK(cryptoProperties->SetDecoderProperties2(item.Salt, item.HasSalt() ? sizeof(item.Salt) : 0));
        filterStreamSpec->Filter = rar29CryptoDecoder;
      }
      else if (item.UnPackVersion >= 20)
      {
        if (!rar20CryptoDecoder)
        {
          rar20CryptoDecoderSpec = new NCrypto::NRar20::CDecoder;
          rar20CryptoDecoder = rar20CryptoDecoderSpec;
          // RINOK(rar20CryptoDecoder.CoCreateInstance(CLSID_CCryptoRar20Decoder));
        }
        filterStreamSpec->Filter = rar20CryptoDecoder;
      }
      else
      {
        outStream.Release();
        RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kUnSupportedMethod));
        continue;
      }
      RINOK(filterStreamSpec->Filter.QueryInterface(IID_ICryptoSetPassword,
          &cryptoSetPassword));

      if (!getTextPassword)
        extractCallback.QueryInterface(IID_ICryptoGetTextPassword,
          &getTextPassword);
      if (getTextPassword)
      {
        CMyComBSTR password;
        RINOK(getTextPassword->CryptoGetTextPassword(&password));
        if (item.UnPackVersion >= 29)
        {
          CByteBuffer buffer;
          UString unicodePassword(password);
          const UInt32 sizeInBytes = unicodePassword.Length() * 2;
          buffer.SetCapacity(sizeInBytes);
          for (int i = 0; i < unicodePassword.Length(); i++)
          {
            wchar_t c = unicodePassword[i];
            ((Byte *)buffer)[i * 2] = (Byte)c;
            ((Byte *)buffer)[i * 2 + 1] = (Byte)(c >> 8);
          }
          RINOK(cryptoSetPassword->CryptoSetPassword(
            (const Byte *)buffer, sizeInBytes));
        }
        else
        {
          AString oemPassword = UnicodeStringToMultiByte(
            (const wchar_t *)password, CP_OEMCP);
          RINOK(cryptoSetPassword->CryptoSetPassword(
            (const Byte *)(const char *)oemPassword, oemPassword.Length()));
        }
      }
      else
      {
        RINOK(cryptoSetPassword->CryptoSetPassword(0, 0));
      }
      filterStreamSpec->SetInStream(folderInStream);
      inStream = filterStream;
    }
    else
    {
      inStream = folderInStream;
    }
    CMyComPtr<ICompressCoder> commonCoder;
    switch(item.Method)
    {
      case '0':
      {
        commonCoder = copyCoder;
        break;
      }
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      {
        /*
        if (item.UnPackVersion >= 29)
        {
          outStream.Release();
          RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kUnSupportedMethod));
          continue;
        }
        */
        int m;
        for (m = 0; m < methodItems.Size(); m++)
          if (methodItems[m].RarUnPackVersion == item.UnPackVersion)
            break;
        if (m == methodItems.Size())
        {
          CMethodItem mi;
          mi.RarUnPackVersion = item.UnPackVersion;

          mi.Coder.Release();
          if (item.UnPackVersion <= 30)
          {
            UInt32 methodID = 0x040300;
            if (item.UnPackVersion < 20)
              methodID += 1;
            else if (item.UnPackVersion < 29)
              methodID += 2;
            else
              methodID += 3;
            RINOK(CreateCoder(EXTERNAL_CODECS_VARS methodID, mi.Coder, false));
          }
         
          if (mi.Coder == 0)
          {
            outStream.Release();
            RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kUnSupportedMethod));
            continue;
          }

          m = methodItems.Add(mi);
        }
        CMyComPtr<ICompressCoder> decoder = methodItems[m].Coder;

        CMyComPtr<ICompressSetDecoderProperties2> compressSetDecoderProperties;
        RINOK(decoder.QueryInterface(IID_ICompressSetDecoderProperties2,
            &compressSetDecoderProperties));
        
        Byte isSolid = (Byte)((IsSolid(index) || item.IsSplitBefore()) ? 1: 0);
        if (solidStart)
        {
          isSolid = false;
          solidStart = false;
        }


        RINOK(compressSetDecoderProperties->SetDecoderProperties2(&isSolid, 1));
          
        commonCoder = decoder;
        break;
      }
      default:
        outStream.Release();
        RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kUnSupportedMethod));
        continue;
    }
    HRESULT result = commonCoder->Code(inStream, outStream, &packSize, &item.Size, progress);
    if (item.IsEncrypted())
      filterStreamSpec->ReleaseInStream();
    if (result == S_FALSE)
    {
      outStream.Release();
      RINOK(extractCallback->SetOperationResult(NArchive::NExtract::NOperationResult::kDataError));
      continue;
    }
    if (result != S_OK)
      return result;

    /*
    if (refItem.NumItems == 1 &&
        !item.IsSplitBefore() && !item.IsSplitAfter())
    */
    {
      const CItemEx &lastItem = _items[refItem.ItemIndex + refItem.NumItems - 1];
      bool crcOK = outStreamSpec->GetCRC() == lastItem.FileCRC;
      outStream.Release();
      RINOK(extractCallback->SetOperationResult(crcOK ? NArchive::NExtract::NOperationResult::kOK:
          NArchive::NExtract::NOperationResult::kCRCError));
    }
    /*
    else
    {
      bool crcOK = true;
      for (int partIndex = 0; partIndex < refItem.NumItems; partIndex++)
      {
        const CItemEx &item = _items[refItem.ItemIndex + partIndex];
        if (item.FileCRC != folderInStreamSpec->CRCs[partIndex])
        {
          crcOK = false;
          break;
        }
      }
      RINOK(extractCallback->SetOperationResult(crcOK ? NArchive::NExtract::NOperationResult::kOK:
          NArchive::NExtract::NOperationResult::kCRCError));
    }
    */
  }
  return S_OK;
  COM_TRY_END
}

IMPL_ISetCompressCodecsInfo

}}