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Approvals:
  laforge: Looks good to me, approved
  Jenkins Builder: Verified

ts_102_221: decode/encode EF.PL

pySIM-shell (MF/EF.PL)> read_binary_decoded
[
    "en",
    null,
    null,
    null,
    null
]

Change-Id: I4e879ef34acee461adb8137a6315d064370b1b10
---
M pySim/ts_102_221.py
1 file changed, 11 insertions(+), 0 deletions(-)

diff --git a/pySim/ts_102_221.py b/pySim/ts_102_221.py
index f145d19..7cc3025 100644
--- a/pySim/ts_102_221.py
+++ b/pySim/ts_102_221.py
@@ -503,6 +503,17 @@
 class EF_PL(TransRecEF):
     def __init__(self, fid='2f05', sfid=0x05, name='EF.PL', desc='Preferred Languages'):
         super().__init__(fid, sfid=sfid, name=name, desc=desc, rec_len=2, size={2,None})
+    def _decode_record_bin(self, bin_data):
+        if bin_data == b'\xff\xff':
+            return None
+        else:
+            return bin_data.decode('ascii')
+    def _encode_record_bin(self, in_json):
+        if in_json is None:
+            return b'\xff\xff'
+        else:
+            return in_json.encode('ascii')
+
 
 # TS 102 221 Section 13.4
 class EF_ARR(LinFixedEF):

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