/// <summary>
/// Open data/map file object with accessibility test before action
/// </summary>
/// <param name="DigestMode"></param>
/// <param name="DataRead"></param>
/// <param name="DataFile"></param>
/// <param name="MapFile"></param>
/// <returns></returns>
public bool Open(bool DigestMode, bool DataRead, string DataFile, string MapFile)
{
MapDummy.Clear();
OpenError = "";
ParamDigestMode = DigestMode;
ParamDataRead = DataRead;
ParamDataFile = DataFile;
ParamMapFile = MapFile;
SegmentSizeL = 0;
SegmentSize = 0;
SegmentCount = 0;
DigestFileSize = 0;
DigestSegmentSize = 0;
try
{
if (DataFile != null)
{
IsDummyFile = DataFile.StartsWith(DummyFileSign, StringComparison.InvariantCulture);
if (IsDummyFile)
{
RandomSequence_ = RandomSequence.CreateRS(DataFile.Substring(1), MailSegment.RandomCacheStep);
if (RandomSequence_ == null)
{
throw new Exception(RandomSequence.ErrorMsg);
}
DummyFileSize = RandomSequence.DummyFileSize;
}
else
{
FileStream Temp = DataOpen();
if (ParamDigestMode)
{
if (ParamDataRead)
{
if (Temp.Length < 32)
{
if (ParamDataRead)
{
Temp.Close();
OpenError = "Incorrect digest file";
return(false);
}
else
{
for (int i = 0; i < DigestSize; i++)
{
Temp.WriteByte((byte)'_');
}
Temp.Seek(0, SeekOrigin.Begin);
}
}
else
{
byte[] Buf1 = new byte[16];
byte[] Buf2 = new byte[16];
Temp.Seek(0, SeekOrigin.Begin);
Temp.Read(Buf1, 0, 16);
Temp.Read(Buf2, 0, 16);
Temp.Seek(0, SeekOrigin.Begin);
try
{
DigestFileSize = long.Parse(MailSegment.BinToStr(Buf1), NumberStyles.HexNumber);
DigestSegmentSize = int.Parse(MailSegment.BinToStr(Buf2), NumberStyles.HexNumber);
}
catch
{
Temp.Close();
OpenError = "Incorrect digest file";
return(false);
}
}
}
}
Temp.Close();
}
}
}
catch (Exception e)
{
OpenError = e.Message;
return(false);
}
try
{
if (MapFile != null)
{
FileStream Temp = MapOpen();
Temp.Close();
}
}
catch (Exception e)
{
OpenError = e.Message;
return(false);
}
return(true);
}
public static RandomSequence CreateRS(string Params, int RandomCacheStep)
{
string[] DummyFileParamsS = Params.Split(',');
int[] DummyFileParamsI = new int[DummyFileParamsS.Length - 1];
for (int i = 0; i < (DummyFileParamsS.Length - 1); i++)
{
try
{
if ((i == 0) || (DummyFileParamsI[0] != 2))
{
DummyFileParamsI[i] = int.Parse(DummyFileParamsS[i + 1]);
}
else
{
DummyFileParamsI[i] = 0;
string StrHex = "";
for (int ii = 0; ii < DummyFileParamsS[i + 1].Length; ii++)
{
string C = DummyFileParamsS[i + 1][ii].ToString().ToUpperInvariant();
if ("0123456789ABCDEF".Contains(C))
{
StrHex = StrHex + C;
}
else
{
ErrorMsg = "Dummy file definition error - the sequence " + DummyFileParamsS[i + 1] + " contains invalid characters";
return(null);
}
}
if ((StrHex.Length % 2) == 1)
{
DummyFileParamsS[i + 1] = "0" + StrHex;
ErrorMsg = "Dummy file definition error - length of the sequence " + DummyFileParamsS[i + 1] + " must be multiply of 2";
return(null);
}
DummyFileParamsS[i + 1] = StrHex;
}
}
catch
{
ErrorMsg = "Dummy file definition error - cannot convert " + DummyFileParamsS[i] + " to integer";
return(null);
}
}
try
{
RandomSequence.DummyFileSize = long.Parse(DummyFileParamsS[0]);
}
catch
{
ErrorMsg = "Dummy file size error - cannot convert " + DummyFileParamsS[0] + " to integer";
return(null);
}
RandomSequence _ = null;
if (DummyFileParamsI[0] == 0)
{
if (DummyFileParamsI.Length != 6)
{
ErrorMsg = "Linear congruential generator requires exactly five parameters";
return(null);
}
_ = new RandomSequenceLCG(RandomCacheStep);
ErrorMsg = ((RandomSequenceLCG)_).Init(DummyFileParamsI[1], DummyFileParamsI[2], DummyFileParamsI[3], DummyFileParamsI[4], DummyFileParamsI[5]);
}
if (DummyFileParamsI[0] == 1)
{
if (DummyFileParamsI.Length < 6)
{
ErrorMsg = "Fibonacci generator requires at least five parameters";
return(null);
}
_ = new RandomSequenceFib(RandomCacheStep);
int[] DummyFileParamsVec = new int[DummyFileParamsI.Length - 5];
for (int i = 0; i < DummyFileParamsVec.Length; i++)
{
DummyFileParamsVec[i] = DummyFileParamsI[i + 5];
}
ErrorMsg = ((RandomSequenceFib)_).Init(DummyFileParamsI[1], DummyFileParamsI[2], DummyFileParamsI[3], DummyFileParamsI[4], DummyFileParamsVec);
}
if (DummyFileParamsI[0] == 2)
{
if (DummyFileParamsI.Length != 3)
{
ErrorMsg = "Digest generator requires exactly two parameters";
return(null);
}
_ = new RandomSequenceDigest(RandomCacheStep);
ErrorMsg = ((RandomSequenceDigest)_).Init(DummyFileParamsI[1], DummyFileParamsS[2], DummyFileParamsS[3]);
}
if (DummyFileParamsI[0] == 3)
{
if ((DummyFileParamsI.Length != 1) && (DummyFileParamsI.Length != 2))
{
ErrorMsg = ".NET internal generator requires no parameters or exactly one parameter";
return(null);
}
_ = new RandomSequenceDotNet(RandomCacheStep);
if (DummyFileParamsI.Length == 1)
{
ErrorMsg = ((RandomSequenceDotNet)_).Init(0, true);
}
if (DummyFileParamsI.Length == 2)
{
ErrorMsg = ((RandomSequenceDotNet)_).Init(DummyFileParamsI[1], false);
}
}
if (_ == null)
{
ErrorMsg = "Supported generator types: 0, 1, 2, 3";
return(null);
}
if (ErrorMsg != "")
{
return(null);
}
return(_);
}
