public override void SetCapacity(long value)
{
if (!CanWrite)
{
throw new IOException("Attempt to change length of file not opened for write");
}
if (value == Capacity)
{
return;
}
long bytesPerCluster = _file.Context.BiosParameterBlock.BytesPerCluster;
long lastVcn = Utilities.Ceil(value, bytesPerCluster);
Dictionary <AttributeReference, AttributeRecord> extentCache = new Dictionary <AttributeReference, AttributeRecord>(_attribute.Extents);
foreach (var extent in extentCache)
{
if (extent.Value.StartVcn > lastVcn)
{
extent.Value.GetDataBuffer(_file).SetCapacity(0);
_file.RemoveAttributeExtent(extent.Key);
_attribute.RemoveExtent(extent.Key);
}
}
var record = _attribute.Record;
var lastExtent = _attribute.LastExtent;
IBuffer buffer = lastExtent.GetDataBuffer(_file);
_file.MarkMftRecordDirty();
if (!record.IsNonResident)
{
buffer.SetCapacity(value);
_file.MarkMftRecordDirty();
}
else
{
if (_file.Context.ClusterBitmap != null)
{
long clusterLength = lastVcn * bytesPerCluster;
buffer.SetCapacity(clusterLength);
record.AllocatedLength = clusterLength;
}
record.DataLength = value;
record.InitializedDataLength = Math.Min(record.InitializedDataLength, value);
}
}
