/// <summary>
/// Opens the historian archive file.
/// </summary>
/// <param name="fileName">File name of historian archive to open.</param>
public void Open(string fileName)
{
m_fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read, 8192, FileOptions.SequentialScan);
int footerPosition = (int)m_fileStream.Length - 32;
m_fileStream.Position = footerPosition;
using (BinaryReader reader = new BinaryReader(m_fileStream, Encoding.Default, true))
{
m_startTime = TimeTag.Convert(reader.ReadDouble());
m_endTime = TimeTag.Convert(reader.ReadDouble());
m_pointsReceived = reader.ReadInt32();
m_pointsArchived = reader.ReadInt32();
m_dataBlockSize = reader.ReadInt32();
m_dataBlockCount = reader.ReadInt32();
int fatPosition = footerPosition - 10 - 12 * m_dataBlockCount;
m_fileStream.Position = fatPosition;
m_dataBlocks = new List <DataBlock>(m_dataBlockCount);
// Scan through header bytes
reader.ReadBytes(10);
DataBlock block = default(DataBlock);
for (int x = 1; x <= m_dataBlockCount; x++)
{
block.BlockID = reader.ReadInt32();
block.Timestamp = TimeTag.Convert(reader.ReadDouble());
m_dataBlocks.Add(block);
}
m_fileStream.Position = 0;
m_buffer = new byte[m_dataBlockSize * 1024];
}
}
public unsafe void Read(Action <Points> callback)
{
using (MemoryStream FS = new MemoryStream(System.IO.File.ReadAllBytes(File)))
//using (System.IO.FileStream FS = new System.IO.FileStream(File, System.IO.FileMode.Open, System.IO.FileAccess.Read,System.IO.FileShare.Read,8192,System.IO.FileOptions.SequentialScan))
{
int FooterPOS = (int)FS.Length - 32;
FS.Position = FooterPOS;
BinaryReader RD = new BinaryReader(FS);
DateTime StartTime = TimeTag.Convert(RD.ReadDouble());
DateTime EndTime = TimeTag.Convert(RD.ReadDouble());
int PointsReceived = RD.ReadInt32();
int PointsArchived = RD.ReadInt32();
int DataBlockSize = RD.ReadInt32();
int DataBlockCount = RD.ReadInt32();
int FATPos = FooterPOS - 10 - 12 * DataBlockCount;
FS.Position = FATPos;
List <Blocks> Blocks = new List <Blocks>(DataBlockCount);
byte[] Header = RD.ReadBytes(10);
Blocks B = default(Blocks);
for (int x = 1; x <= DataBlockCount; x++)
{
B.BlockID = RD.ReadInt32();
B.Time = TimeTag.Convert(RD.ReadDouble());
Blocks.Add(B);
}
FS.Position = 0;
Points P = default(Points);
int NextPos = DataBlockSize * 1024;
byte[] Buffer = new byte[DataBlockSize * 1024];
fixed(byte *lp = Buffer)
{
foreach (Blocks BK in Blocks)
{
FS.Read(Buffer, 0, DataBlockSize * 1024);
int pos = 0;
while (pos < DataBlockSize * 1024 - 9)
{
int I = *(int *)(lp + pos);
short S = *(short *)(lp + pos + 4);
float V = *(float *)(lp + pos + 6);
pos += 10;
long TimeDiff = I * 1000L + (S >> 5);
if (TimeDiff != 0)
{
P.Time = TimeTag.Convert(TimeDiff);
P.Value = V;
P.PointID = BK.BlockID;
callback(P);
}
}
//FS.Position = NextPos;
NextPos += DataBlockSize * 1024;
}
return;
}
}
}
