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utils.py: Add helper method to parse and print Service Table

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This method helps in printing Service Tables in EF.SST, EF.UST, EF.IST.
Takes hex string of Service table, parses it and prints available service along with its description.

Change-Id: Ie1e82e07ead2e28314a5794661e6b2ced0acd72a
This commit is contained in:
Supreeth Herle
2020-04-20 13:28:31 +02:00
parent 3e6f16d8f6
commit 0c4d82d84a
1 changed files with 31 additions and 0 deletions
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31
pySim/utils.py
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@@ -347,3 +347,34 @@ def parse_st(st):
avail_srvc.append((8*i) + j)
byte = byte >> 1
return avail_srvc
def dec_st(st, table="sim"):
"""
Parses the EF S/U/IST and prints the list of available services in EF S/U/IST
"""
if table == "usim":
from pySim.ts_31_102 import EF_UST_map
lookup_map = EF_UST_map
else:
from pySim.ts_51_011 import EF_SST_map
lookup_map = EF_SST_map
st_bytes = [st[i:i+2] for i in range(0, len(st), 2) ]
avail_st = ""
# Get each byte and check for available services
for i in range(0, len(st_bytes)):
# Byte i contains info about Services num (8i+1) to num (8i+8)
byte = int(st_bytes[i], 16)
# Services in each byte are in order MSB to LSB
# MSB - Service (8i+8)
# LSB - Service (8i+1)
for j in range(1, 9):
if byte&0x01 == 0x01 and ((8*i) + j in lookup_map):
# Byte X contains info about Services num (8X-7) to num (8X)
# bit = 1: service available
# bit = 0: service not available
avail_st += '\tService %d - %s\n' % ((8*i) + j, lookup_map[(8*i) + j])
byte = byte >> 1
return avail_st