///////////////////////////////////////////////////////////////////////////////
// FindRoomForData
///////////////////////////////////////////////////////////////////////////////
int cBlockRecordFile::FindRoomForData(int32 dataSize) //throw (eArchive)
{
ASSERT((dataSize > 0) && (dataSize <= cBlockRecordArray::MAX_DATA_SIZE));
ASSERT(mbOpen);
#ifdef _BLOCKFILE_DEBUG
AssertValid();
#endif
cDebug d("cBlockRecordFile::FindRoomForData");
// first, try the last added to block...
//
d.TraceDetail("Looking for room for %d bytes; first trying mLastAddedTo (%d)\n", dataSize, mLastAddedTo);
if (mLastAddedTo >= 0)
{
util_InitBlockArray(mvBlocks[mLastAddedTo]);
if (mvBlocks[mLastAddedTo].GetAvailableSpace() >= dataSize)
{
d.TraceDetail("---Found room in block %d\n", mLastAddedTo);
return mLastAddedTo;
}
}
//
// ok, I guess we will have to iterate through all the blocks...
//
BlockArray::iterator it;
int cnt = 0;
for (it = mvBlocks.begin(); it != mvBlocks.end(); ++it, ++cnt)
{
util_InitBlockArray(*it);
if (it->GetAvailableSpace() >= dataSize)
{
d.TraceDetail("---Found room in block %d\n", cnt);
return cnt;
}
}
//
// if we got here, then we need to add a new block
//
d.TraceDetail("---We need to add new block(%d)\n", cnt);
mBlockFile.CreateBlock();
ASSERT((mBlockFile.GetNumBlocks() == (mvBlocks.size() + 1)) && (mvBlocks.size() == cnt));
mvBlocks.push_back(cBlockRecordArray(&mBlockFile, cnt));
mvBlocks.back().InitNewBlock();
ASSERT(mvBlocks.back().GetAvailableSpace() >= dataSize);
return cnt;
}
///////////////////////////////////////////////////////////////////////////////
// OpenImpl
///////////////////////////////////////////////////////////////////////////////
void cBlockRecordFile::OpenImpl( bool bTruncate ) //throw (eArchive)
{
ASSERT( ! mbOpen );
//
// create the vector of block record arrays...avoid initializing them all
// right now so that we don't page the whole file into memory
//
mvBlocks.clear();
for( int i=0; i < mBlockFile.GetNumBlocks(); i++ )
{
mvBlocks.push_back( cBlockRecordArray( &mBlockFile, i ) );
//
// if we are creating a new file, initialize the block for first usage...
//
if( bTruncate )
{
mvBlocks.back().InitNewBlock();
}
}
//
// use the integrity of the first block as a q&d check for file integrity...
//
ASSERT( mvBlocks.size() > 0 );
if(! mvBlocks.begin()->Initialized() )
{
mvBlocks.begin()->InitForExistingBlock();
}
if( ! mvBlocks.begin()->IsClassValid() )
{
TSTRING str = _T("Bad file format for the Block Record File");
throw eArchiveFormat( str );
}
// set the last item added to to zero (TODO -- is this the right thing to do or
// should I store it in the archive?
//
mLastAddedTo = 0;
mbOpen = true;
}
