110 lines
2.8 KiB

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
A collection of useful routines to make this tool work
(C) 2017 by Sysmocom s.f.m.c. GmbH
All Rights Reserved
Author: Philipp Maier
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>.
# Convert list to an printable ascii hex string
def hexdump(array, multilne = False, width = 30, prefix = " "):
if array == None:
return "(no data)"
if multilne:
result = ""
for i in range(0, len(array), width):
buf = array[i:i + width]
result += prefix
result += ''.join('{:02x}'.format(x) for x in buf)
result += "\n"
return result.rstrip()
return ''.join('{:02x}'.format(x) for x in array)
# Convert ascii string with decimal numbers to numeric ascii-code list
def ascii_to_list(string):
rc = []
for c in string:
return rc
# Convert an ascii hex string to numeric list
def asciihex_to_list(string):
string = string.translate(str.maketrans('','',':'))
return list(map(ord,''.join(['%c' % b for b in bytearray.fromhex(string)])))
print("Warning: Invalid hex string -- ignored!")
return []
# Pad an ascihex string with a nibble in case it is "incomplete"
def pad_asciihex(string, front=False, padding='f'):
if front and len(string) % 2 != 0:
return padding + string
elif len(string) % 2 != 0:
return string + padding
return string
# Swap nibbles of each byte in an array
def swap_nibbles(array):
rc = []
for a in array:
rc.append(((a & 0xf0) >> 4) | ((a & 0x0f) << 4))
return rc
# Convert from list of bytes to big-endian integer
def list_to_int(arr):
return int(hexdump(arr), 16)
# Encode an integer number into list of bytes (e.g. 1025 becomes [4, 1])
def int_to_list(inp, num_bytes):
out = []
for i in range(0, num_bytes):
shift_bits = ((num_bytes-1-i) * 8)
out.append((inp >> shift_bits) & 0xFF)
return out
# Lookup a string in a given table by its ID
def id_to_str(table, nr):
dict_by_nr = dict(table)
return dict_by_nr.get(nr) or '(invalid)'
# Convert a string back to its ID by looking it up in a given table
def str_to_id(table, string):
dict_by_name = dict([(name.upper(), nr) for nr, name in table])
id = dict_by_name.get(string.upper())
if id is None:
raise ValueError('identifier (\"%s\") not in table %s' % (string, str(table)))
return id