/// <summary>
/// Files and containers initialisation
/// </summary>
private void Init(int bFactor, int overflowBFactor, string mainFileDiskLetter, string overflowFileDiskLetter)
{
UtilityOperations.GetDiskFreeSpace(mainFileDiskLetter, out var SectorsPerCluster, out var BytesPerSector, out _, out _);
var ClusterSize = SectorsPerCluster * BytesPerSector;
_BFactor = bFactor == -1 ? (ClusterSize - 8) / _emptyClass.GetSize() : bFactor;
_OverflowBFactor = overflowBFactor == -1 ? (ClusterSize - 8) / _emptyClass.GetSize() : overflowBFactor;
_blocksInformations = new List <BlockInfo>((int)Math.Pow(2, _hashDepth));
var block = new Block <T>(_BFactor, _emptyClass.GetEmptyClass());
var overflowBlock = new Block <T>(_OverflowBFactor, _emptyClass.GetEmptyClass());
_fileManager = new FileManager(_filePath, block.GetSize());
_overflowManager = new OverflowFileManager <T>("overflow." + _filePath, overflowBlock.GetSize(), _emptyClass, _OverflowBFactor);
var address = _fileManager.GetFreeAddress();
_blocksInformations.Add(new BlockInfo {
Address = address, Depth = 1, Records = 0
});
WriteBlock(address, block);
address = _fileManager.GetFreeAddress();
_blocksInformations.Add(new BlockInfo {
Address = address, Depth = 1, Records = 0
});
WriteBlock(address, block);
}
public bool TryLoad()
{
try {
var stream = new FileStream("config." + _filePath, FileMode.Open);
var buffer = new byte[sizeof(int)];
// citanie suboru
stream.Read(buffer);
_BFactor = BitConverter.ToInt32(buffer);
var block = new Block <T>(_BFactor, _emptyClass.GetEmptyClass());
_fileManager = new FileManager(_filePath, block.GetSize(), false);
stream.Read(buffer);
_OverflowBFactor = BitConverter.ToInt32(buffer);
var overflowBlock = new Block <T>(_OverflowBFactor, _emptyClass.GetEmptyClass());
_overflowManager = new OverflowFileManager <T>("overflow." + _filePath, overflowBlock.GetSize(), _emptyClass, _OverflowBFactor, false);
stream.Read(buffer);
_hashDepth = BitConverter.ToInt32(buffer);
_blocksInformations = new List <BlockInfo>((int)Math.Pow(2, _hashDepth));
stream.Read(buffer);
var blocksInfoCount = BitConverter.ToInt32(buffer);
if (blocksInfoCount > 0)
{
stream.Read(buffer);
var distinctCount = BitConverter.ToInt32(buffer);
BlockInfo blockInfo;
for (int i = 0; i < distinctCount; i++)
{
// zistom kolko opakovani
stream.Read(buffer);
var repetition = BitConverter.ToInt32(buffer);
// ziskam blockInfo
blockInfo = new BlockInfo();
buffer = new byte[blockInfo.GetSize()];
stream.Read(buffer);
blockInfo.FromByteArray(buffer);
// vlozim info potrebny pocet krat
while (repetition-- > 0)
{
_blocksInformations.Add(blockInfo);
}
buffer = new byte[sizeof(int)];
}
}
stream.Read(buffer);
var fileManagerAddresses = BitConverter.ToInt32(buffer);
if (fileManagerAddresses > 0)
{
buffer = new byte[sizeof(int) * fileManagerAddresses];
_fileManager.FromByteArray(buffer);
}
var overflowManagerSize = stream.Length - stream.Position;
buffer = new byte[overflowManagerSize];
stream.Read(buffer);
_overflowManager.FromByteArray(buffer);
stream.Close();
return(true);
} catch (FileNotFoundException ex) {
Console.WriteLine("File " + ex.FileName + " does not exist.");
return(false);
}
}
