public HexBoxUndoCommand(HexBox hexBox, HexBoxPosition origCaretPos, ulong offset, byte[] origData, string descr) {
this.doc = hexBox.Document;
this.hexBoxWeakRef = new WeakReference(hexBox);
this.origCaretPos = origCaretPos;
this.newCaretPos = hexBox.CaretPosition;
this.offset = offset;
this.origData = origData;
this.newData = doc.ReadBytes(offset, origData.Length);
this.descr = descr;
this.canExecute = false;
}