//---------------------------------------------------------------------------------------------------
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;
}
//---------------------------------------------------------------------------------------------------
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;
}