private void MoveAttribute(FileRecord record, AttributeRecord attrRec, FileRecord targetRecord)
{
AttributeReference oldRef = new AttributeReference(record.Reference, attrRec.AttributeId);
record.RemoveAttribute(attrRec.AttributeId);
targetRecord.AddAttribute(attrRec);
AttributeReference newRef = new AttributeReference(targetRecord.Reference, attrRec.AttributeId);
foreach (var attr in _attributes)
{
attr.ReplaceExtent(oldRef, newRef, attrRec);
}
UpdateAttributeList();
}
private bool SplitAttribute(FileRecord record, NonResidentAttributeRecord targetAttr, bool atStart)
{
if (targetAttr.DataRuns.Count <= 1)
{
return(false);
}
int splitIndex = 1;
if (!atStart)
{
// Approximation only - assumes each run is at least one byte saved. Could calculate the
// actual index here.
splitIndex = (int)(targetAttr.DataRuns.Count - (record.Size - record.AllocatedSize));
}
AttributeRecord newAttr = targetAttr.Split(splitIndex);
// Find a home for the new attribute record
FileRecord newAttrHome = null;
foreach (var targetRecord in _records)
{
if (!targetRecord.IsMftRecord && _mft.RecordSize - targetRecord.Size >= newAttr.Size)
{
targetRecord.AddAttribute(newAttr);
newAttrHome = targetRecord;
}
}
if (newAttrHome == null)
{
newAttrHome = _mft.AllocateRecord(_records[0].Flags & (~FileRecordFlags.InUse), record.IsMftRecord);
newAttrHome.BaseFile = record.BaseFile.IsNull ? record.Reference : record.BaseFile;
_records.Add(newAttrHome);
newAttrHome.AddAttribute(newAttr);
}
// Add the new attribute record as an extent on the attribute it split from
bool added = false;
foreach (var attr in _attributes)
{
foreach (var existingRecord in attr.Extents)
{
if (existingRecord.Key.File == record.Reference && existingRecord.Key.AttributeId == targetAttr.AttributeId)
{
attr.AddExtent(newAttrHome.Reference, newAttr);
added = true;
break;
}
}
if (added)
{
break;
}
}
UpdateAttributeList();
return(true);
}