private void ReadShortDescriptors(byte[] activeBuffer)
{
long filePos = 0;
int i = 0;
while (i < activeBuffer.Length)
{
ShortAllocationDescriptor sad = Utilities.ToStruct <ShortAllocationDescriptor>(activeBuffer, i);
if (sad.ExtentLength == 0)
{
break;
}
if (sad.Flags != ShortAllocationFlags.RecordedAndAllocated)
{
throw new NotImplementedException("Extents that are not 'recorded and allocated' not implemented");
}
CookedExtent newExtent = new CookedExtent
{
FileContentOffset = filePos,
Partition = int.MaxValue,
StartPos = sad.ExtentLocation * (long)_blockSize,
Length = sad.ExtentLength
};
_extents.Add(newExtent);
filePos += sad.ExtentLength;
i += sad.Size;
}
}
private void LoadExtents()
{
_extents = new List <CookedExtent>();
byte[] activeBuffer = _fileEntry.AllocationDescriptors;
AllocationType allocType = _fileEntry.InformationControlBlock.AllocationType;
if (allocType == AllocationType.ShortDescriptors)
{
long filePos = 0;
int i = 0;
while (i < activeBuffer.Length)
{
ShortAllocationDescriptor sad = EndianUtilities.ToStruct <ShortAllocationDescriptor>(activeBuffer, i);
if (sad.ExtentLength == 0)
{
break;
}
if (sad.Flags != ShortAllocationFlags.RecordedAndAllocated)
{
throw new NotImplementedException(
"Extents that are not 'recorded and allocated' not implemented");
}
CookedExtent newExtent = new CookedExtent
{
FileContentOffset = filePos,
Partition = int.MaxValue,
StartPos = sad.ExtentLocation * (long)_blockSize,
Length = sad.ExtentLength
};
_extents.Add(newExtent);
filePos += sad.ExtentLength;
i += sad.Size;
}
}
else if (allocType == AllocationType.Embedded)
{
// do nothing
}
else if (allocType == AllocationType.LongDescriptors)
{
long filePos = 0;
int i = 0;
while (i < activeBuffer.Length)
{
LongAllocationDescriptor lad = EndianUtilities.ToStruct <LongAllocationDescriptor>(activeBuffer, i);
if (lad.ExtentLength == 0)
{
break;
}
CookedExtent newExtent = new CookedExtent
{
FileContentOffset = filePos,
Partition = lad.ExtentLocation.Partition,
StartPos = lad.ExtentLocation.LogicalBlock * (long)_blockSize,
Length = lad.ExtentLength
};
_extents.Add(newExtent);
filePos += lad.ExtentLength;
i += lad.Size;
}
}
else
{
throw new NotImplementedException("Allocation Type: " +
_fileEntry.InformationControlBlock.AllocationType);
}
}
