protected override CrcCalculatorStream CreatePart(int partnum)
{
if (partnum > 1 && internalStream != null)
{
if (currentPart != null)
{
currentPart.Crc = (uint)internalStream.Crc;
}
internalStream.Close();
internalStream.Dispose();
}
string partName = GetPartName(partnum);
// Create a new part
PartialFile newPart = new PartialFile(partName, partSize, partnum, Position);
Parts.Add(newPart);
currentPart = newPart;
// Create a new part
positionInPart = 0;
return(new CrcCalculatorStream(new FileStream(partName, mode, access), false));
}
private bool OpenPart(PartialFile part)
{
if (!File.Exists(part.Filename))
{
return(false);
}
currentPart.Crc = (uint)internalStream.Crc;
internalStream.Close();
internalStream.Dispose();
internalStream = new CrcCalculatorStream(new FileStream(part.Filename, mode, access), false);
currentPart = part;
positionInPart = 0;
return(true);
}
private bool OpenPart(PartialFile part)
{
if (!File.Exists(part.Filename))
{
return(false);
}
if (_current != null)
{
_current.Close();
_current.Dispose();
}
_current = new FileStream(part.Filename, FileMode.Open, FileAccess.Read);
_currentPart = part;
positionInPart = 0;
return(true);
}
private void Initialize()
{
Parts = new List <PartialFile>();
// Check if file .z01 exists
if (isReading)
{
FindParts();
currentPart = Parts.First();
string path = currentPart.Filename;
isMultipart = amountOfParts > 1;
internalStream = new CrcCalculatorStream(new FileStream(path, mode, access), false);
}
else
{
isMultipart = Interaction.Instance.MultiPart;
internalStream = CreatePart(1);
}
}
public override long Seek(long offset, SeekOrigin origin)
{
// Find the correct part
long offsetFromStart = 0;
switch (origin)
{
case SeekOrigin.Begin:
offsetFromStart = offset;
break;
case SeekOrigin.Current:
offsetFromStart = Position + offset;
break;
case SeekOrigin.End:
offsetFromStart = length + offset;
break;
}
// Use this to calculate the correct file
PartialFile part = FindPartAt(offsetFromStart);
Debug.WriteLine("Seeking to {0} from {1}, found in part {2}, currentpart {3}", offset, origin, part.Number,
currentPart.Number);
if (!currentPart.Equals(part))
{
if (!OpenPart(part))
{
positionInPart = currentPart.Length;
internalStream.Seek(0, SeekOrigin.End);
_position = currentPart.StartPosition + currentPart.Length;
return(_position);
}
}
positionInPart = offsetFromStart - currentPart.StartPosition;
internalStream.Seek(positionInPart, SeekOrigin.Begin);
_position = offsetFromStart;
return(_position);
}
public override void Close()
{
base.Close();
if (!isMultipart || Parts.Count != 1)
{
return;
}
// Started as multipart, but it's only one! Let's rename it
isMultipart = false;
string newFile = GetPartName(1);
PartialFile p = Parts.First();
if (File.Exists(newFile))
{
File.Delete(newFile);
}
File.Move(p.Filename, newFile);
p.Filename = newFile;
}
public override long Seek(long offset, SeekOrigin origin)
{
long offsetFromStart = 0;
switch (origin)
{
case SeekOrigin.Begin:
offsetFromStart = offset;
break;
case SeekOrigin.Current:
offsetFromStart = Position + offset;
break;
case SeekOrigin.End:
offsetFromStart = length + offset;
break;
}
// Use this to calculate the correct file
PartialFile part = FindPartAt(offsetFromStart);
if (!_currentPart.Equals(part))
{
if (!OpenPart(part))
{
positionInPart = _currentPart.Length;
_current.Seek(0, SeekOrigin.End);
_position = _currentPart.StartPosition + _currentPart.Length;
return(_position);
}
}
positionInPart = offsetFromStart - _currentPart.StartPosition;
_current.Seek(positionInPart, SeekOrigin.Begin);
_position = offsetFromStart;
return(_position);
}
