C++ (Cpp) DataStore::GetBlock Examples

Example #1

File: DataStore.cpp Project: anareboucas/nanook

//---------------------------------------------------------------------------------------------------
Ptr<DataStore> DataStore::Open(LPCTSTR Filename)
{
  DataStore* pStore = new DataStore();

  pStore->m_pFile = MemoryMappedFile::Open(Filename, FileMode::OPEN);
  pStore->m_pView = pStore->m_pFile->CreateView();

  pStore->m_pHeader = (STOREHEADER*)pStore->m_pView->GetBasePointer();

  if (pStore->m_pHeader->DataStoreVersion != DATASTOREVERSION)
    throw DataStoreException(pStore, "The DataStore version number is unknown");

  pStore->m_pBlockAllocationIndex0 = (BLOCKADDRESS*)pStore->GetBlock(pStore->m_pHeader->BlockAllocationIndex0);
  pStore->m_pBlockBitmaps = new DWORD*[pStore->m_pHeader->BlockSize / sizeof(BLOCKADDRESS)];
  
  for (SIZE_T i=0; i<pStore->m_pHeader->BlockSize / sizeof(BLOCKADDRESS); i++)
  {
    if (pStore->m_pBlockAllocationIndex0[i] != 0)
      pStore->m_pBlockBitmaps[i] = (DWORD*)pStore->GetBlock(pStore->m_pBlockAllocationIndex0[i]);
    else
      pStore->m_pBlockBitmaps[i] = 0;
  }

  return pStore;
}

Example #2

File: DataStore.cpp Project: anareboucas/nanook

//---------------------------------------------------------------------------------------------------
Ptr<DataStore> DataStore::Create(LPCTSTR Filename, BLOCKADDRESS BlockSize)
{
  DataStore* pStore = new DataStore();

  if (BlockSize < sizeof(STOREHEADER))
    throw DataStoreException(pStore, "The BlockSize must be at least as large as the size of the header");

  pStore->m_pFile = MemoryMappedFile::Open(Filename, FileMode::CREATE);
  pStore->m_pFile->Resize(10 * BlockSize);
  pStore->m_pView = pStore->m_pFile->CreateView();

  pStore->m_pHeader = (STOREHEADER*)pStore->m_pView->GetBasePointer();
  ZeroMemory(pStore->m_pHeader, sizeof(STOREHEADER));

  pStore->m_pHeader->DataStoreVersion = DATASTOREVERSION;
  pStore->m_pHeader->BlockAllocationIndex0 = 1;
  pStore->m_pHeader->BlockCount = 10;
  pStore->m_pHeader->BlockSize = BlockSize;
  pStore->m_pHeader->FreeBlockCount = 6;
  //pStore->m_pHeader->MetaDataTable.BlockCount = 0;
  //pStore->m_pHeader->MetaDataTable.BlockDirectory = 0;

  pStore->m_pBlockAllocationIndex0 = (BLOCKADDRESS*)pStore->GetBlock(1);
  pStore->m_pBlockBitmaps = new DWORD*[BlockSize / sizeof(BLOCKADDRESS)];
  ZeroMemory(pStore->m_pBlockBitmaps, sizeof(DWORD*) * BlockSize / sizeof(BLOCKADDRESS));

  pStore->m_pBlockAllocationIndex0[0] = 2;
  pStore->m_pBlockBitmaps[0] = (DWORD*)pStore->GetBlock(2);
  pStore->m_pBlockAllocationIndex0[1] = 3;
  pStore->m_pBlockBitmaps[1] = (DWORD*)pStore->GetBlock(3);

  pStore->m_pBlockBitmaps[0][0] = 0xf;

  return pStore;
}