private int CalculateDataBlockNodeSize()
{
using var memStream = new MemoryStream();
var dataBlock = new DataBlockNode(0, 0, 1);
ZeroFormatterSerializer.Serialize(memStream, dataBlock);
return(metaInfDataStorage.DataBlockSize - (int)memStream.Length + 1);
}
public void SaveDataBlock(DataBlockNode block, int offset)
{
_fileStream.Seek(offset, SeekOrigin.Begin);
//using var memStream = new MemoryStream();
block = new DataBlockNode(block);
ZeroFormatterSerializer.Serialize(_fileStream, block);
//memStream.CopyTo(fs);
_fileStream.Flush(true);
writeCount++;
}
public DataBlockNode(DataBlockNode from)
{
if (from is null)
{
throw new ArgumentNullException(nameof(from));
}
CountRealRecords = from.CountRealRecords;
CountNotDeletedRecords = from.CountNotDeletedRecords;
NextBlock = from.NextBlock;
PrevBlock = from.PrevBlock;
Data = from.Data;
}
public void CreateAndAddDataBlock()
{
var metaInf = metaInfDataStorage;
DataBlockNode newBlock;
if (metaInf.HeadDataBlockList != 0)
{
var prevBlock = LoadDataBlock(metaInf.HeadDataBlockList);
newBlock = new DataBlockNode(0, metaInf.HeadDataBlockList, CalculateDataBlockNodeSize());
metaInf.HeadDataBlockList = (int)_fileStream.Seek(-GetCalculateMetaInfDataStorageSize(), SeekOrigin.End);
prevBlock.PrevBlock = metaInf.HeadDataBlockList;
SaveDataBlock(prevBlock, newBlock.NextBlock);
}
else
{
newBlock = new DataBlockNode(0, 0, CalculateDataBlockNodeSize());
metaInf.HeadDataBlockList = (int)_fileStream.Seek(-GetCalculateMetaInfDataStorageSize(), SeekOrigin.End);
}
SaveDataBlock(newBlock, metaInf.HeadDataBlockList);
CreateMetaInfInEnd(metaInf);
}
public void DeleteBlock(DataBlockNode block)
{
var nextBlock = LoadDataBlock(block.NextBlock);
var prevBlock = LoadDataBlock(block.PrevBlock);
var curBlockOff = prevBlock == null ? metaInfDataStorage.HeadDataBlockList : prevBlock.NextBlock;
if (nextBlock != null)
{
nextBlock.PrevBlock = block.PrevBlock;
SaveDataBlock(nextBlock, block.NextBlock);
}
if (prevBlock != null)
{
prevBlock.NextBlock = block.NextBlock;
SaveDataBlock(prevBlock, block.PrevBlock);
}
else
{
metaInfDataStorage.HeadDataBlockList = block.NextBlock;
}
if (metaInfDataStorage.HeadFreeBlockList == 0)
{
metaInfDataStorage.HeadFreeBlockList = curBlockOff;
block = new DataBlockNode(0, 0, CalculateDataBlockNodeSize());
}
else
{
var prevDelBlock = LoadDataBlock(metaInfDataStorage.HeadFreeBlockList);
block = new DataBlockNode(0, metaInfDataStorage.HeadFreeBlockList, CalculateDataBlockNodeSize());
metaInfDataStorage.HeadFreeBlockList = curBlockOff;
prevDelBlock.PrevBlock = metaInfDataStorage.HeadFreeBlockList;
SaveDataBlock(prevDelBlock, block.NextBlock);
}
SaveDataBlock(block, metaInfDataStorage.HeadFreeBlockList);
SaveMetaInfStorage(metaInfDataStorage);
}
public RecordsInDataBlockNodeEnumarator(DataBlockNode dataBlock, int recordSize)
{
_dataBlock = dataBlock;
_recordSize = recordSize;
Reset();
}