utils: add EF [H|O]PLMNwAcT decoding.
Allow decoding and pretty printing of PLMNwAcT, HPLMNwAcT and OPLMNwAct.
Includes unit tests for the added functions.
Change-Id: I9b8ca6ffd98f665690b84239d9a228e2c72c6ff9
diff --git a/pySim/utils.py b/pySim/utils.py
index ba94702..65f10c5 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -113,6 +113,79 @@
if oplmn_disp: byte1 = byte1|0x02
return i2h([byte1])+s2h(name)
+def hexstr_to_fivebytearr(s):
+ return [s[i:i+10] for i in range(0, len(s), 10) ]
+
+# Accepts hex string representing three bytes
+def dec_mcc_from_plmn(plmn):
+ ia = h2i(plmn)
+ digit1 = ia[0] & 0x0F # 1st byte, LSB
+ digit2 = (ia[0] & 0xF0) >> 4 # 1st byte, MSB
+ digit3 = ia[1] & 0x0F # 2nd byte, LSB
+ if digit3 == 0xF and digit2 == 0xF and digit1 == 0xF:
+ return 0xFFF # 4095
+ mcc = digit1 * 100
+ mcc += digit2 * 10
+ mcc += digit3
+ return mcc
+
+def dec_mnc_from_plmn(plmn):
+ ia = h2i(plmn)
+ digit1 = ia[2] & 0x0F # 3rd byte, LSB
+ digit2 = (ia[2] & 0xF0) >> 4 # 3rd byte, MSB
+ digit3 = (ia[1] & 0xF0) >> 4 # 2nd byte, MSB
+ if digit3 == 0xF and digit2 == 0xF and digit1 == 0xF:
+ return 0xFFF # 4095
+ mnc = 0
+ # signifies two digit MNC
+ if digit3 == 0xF:
+ mnc += digit1 * 10
+ mnc += digit2
+ else:
+ mnc += digit1 * 100
+ mnc += digit2 * 10
+ mnc += digit3
+ return mnc
+
+def dec_act(twohexbytes):
+ act_list = [
+ {'bit': 15, 'name': "UTRAN"},
+ {'bit': 14, 'name': "E-UTRAN"},
+ {'bit': 7, 'name': "GSM"},
+ {'bit': 6, 'name': "GSM COMPACT"},
+ {'bit': 5, 'name': "cdma2000 HRPD"},
+ {'bit': 4, 'name': "cdma2000 1xRTT"},
+ ]
+ ia = h2i(twohexbytes)
+ u16t = (ia[0] << 8)|ia[1]
+ sel = []
+ for a in act_list:
+ if u16t & (1 << a['bit']):
+ sel.append(a['name'])
+ return sel
+
+def dec_xplmn_w_act(fivehexbytes):
+ res = {'mcc': 0, 'mnc': 0, 'act': []}
+ plmn_chars = 6
+ act_chars = 4
+ plmn_str = fivehexbytes[:plmn_chars] # first three bytes (six ascii hex chars)
+ act_str = fivehexbytes[plmn_chars:plmn_chars + act_chars] # two bytes after first three bytes
+ res['mcc'] = dec_mcc_from_plmn(plmn_str)
+ res['mnc'] = dec_mnc_from_plmn(plmn_str)
+ res['act'] = dec_act(act_str)
+ return res
+
+def format_xplmn_w_act(hexstr):
+ s = ""
+ for rec_data in hexstr_to_fivebytearr(hexstr):
+ rec_info = dec_xplmn_w_act(rec_data)
+ if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF:
+ rec_str = "unused"
+ else:
+ rec_str = "MCC: %3s MNC: %3s AcT: %s" % (rec_info['mcc'], rec_info['mnc'], ", ".join(rec_info['act']))
+ s += "\t%s # %s\n" % (rec_data, rec_str)
+ return s
+
def derive_milenage_opc(ki_hex, op_hex):
"""
Run the milenage algorithm to calculate OPC from Ki and OP