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filesystem: keep track of currently selected ADF

As it is possible to select files relative to the currently selected
ADF, we should keep track of that.

Change-Id: I83c93fdcd23b1d3877644ef0bf72d330343fbbc7
---
M pySim/filesystem.py
1 file changed, 3 insertions(+), 0 deletions(-)

diff --git a/pySim/filesystem.py b/pySim/filesystem.py
index c40eaf8..813bebb 100644
--- a/pySim/filesystem.py
+++ b/pySim/filesystem.py
@@ -1253,6 +1253,7 @@
         self.mf = CardMF(profile=profile)
         self.card = card
         self.selected_file = self.mf  # type: CardDF
+        self.selected_adf = None
         self.profile = profile
         self.selected_file_fcp = None
         self.selected_file_fcp_hex = None
@@ -1337,6 +1338,7 @@
         atr = i2h(self.card.reset())
         # select MF to reset internal state and to verify card really works
         self.select('MF', cmd_app)
+        self.selected_adf = None
         return atr
 
     def get_cwd(self) -> CardDF:
@@ -1445,6 +1447,7 @@
             try:
                 if isinstance(p, CardADF):
                     (data, sw) = self.card.select_adf_by_aid(p.aid)
+                    self.selected_adf = p
                 else:
                     (data, sw) = self.card._scc.select_file(p.fid)
                 self.selected_file = p

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