/usr/share/pyshared/messaging/utils.py is in python-messaging 0.5.11+debian-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 | from array import array
from datetime import timedelta, tzinfo
from math import floor
import sys
class FixedOffset(tzinfo):
"""Fixed offset in minutes east from UTC."""
def __init__(self, offset, name):
if isinstance(offset, timedelta):
self.offset = offset
else:
self.offset = timedelta(minutes=offset)
self.__name = name
@classmethod
def from_timezone(cls, tz_str, name):
# no timezone, GMT+3, GMT-3
# '', '+0330', '-0300'
if not tz_str:
return cls(timedelta(0), name)
sign = 1 if '+' in tz_str else -1
offset = tz_str.replace('+', '').replace('-', '')
hours, minutes = int(offset[:2]), int(offset[2:])
minutes += hours * 60
if sign == 1:
td = timedelta(minutes=minutes)
elif sign == -1:
td = timedelta(days=-1, minutes=minutes)
return cls(td, name)
def utcoffset(self, dt):
return self.offset
def tzname(self, dt):
return self.__name
def dst(self, dt):
return timedelta(0)
def bytes_to_str(b):
if sys.version_info >= (3,):
return b.decode('latin1')
return b
def to_array(pdu):
return array('B', [int(pdu[i:i + 2], 16) for i in range(0, len(pdu), 2)])
def to_bytes(s):
if sys.version_info >= (3,):
return bytes(s)
return ''.join(map(unichr, s))
def debug(s):
# set this to True if you want to poke at PDU encoding/decoding
if False:
print s
def swap(s):
"""Swaps ``s`` according to GSM 23.040"""
what = s[:]
for n in range(1, len(what), 2):
what[n - 1], what[n] = what[n], what[n - 1]
return what
def swap_number(n):
data = swap(list(n.replace('f', '')))
return ''.join(data)
def clean_number(n):
return n.strip().replace(' ', '')
def encode_str(s):
"""Returns the hexadecimal representation of ``s``"""
return ''.join(["%02x" % ord(n) for n in s])
def encode_bytes(b):
return ''.join(["%02x" % n for n in b])
def pack_8bits_to_7bits(message, udh=None):
pdu = ""
txt = bytes_to_str(message)
if udh is None:
tl = len(txt)
txt += '\x00'
msgl = int(len(txt) * 7 / 8)
op = [-1] * msgl
c = shift = 0
for n in range(msgl):
if shift == 6:
c += 1
shift = n % 7
lb = ord(txt[c]) >> shift
hb = (ord(txt[c + 1]) << (7 - shift) & 255)
op[n] = lb + hb
c += 1
pdu = chr(tl) + ''.join(map(chr, op))
else:
txt = "\x00\x00\x00\x00\x00\x00" + txt
tl = len(txt)
txt += '\x00'
msgl = int(len(txt) * 7 / 8)
op = [-1] * msgl
c = shift = 0
for n in range(msgl):
if shift == 6:
c += 1
shift = n % 7
lb = ord(txt[c]) >> shift
hb = (ord(txt[c + 1]) << (7 - shift) & 255)
op[n] = lb + hb
c += 1
for i, char in enumerate(udh):
op[i] = ord(char)
pdu = chr(tl) + ''.join(map(chr, op))
return encode_str(pdu)
def pack_8bits_to_8bit(message, udh=None):
text = message
if udh is not None:
text = udh + text
mlen = len(text)
message = chr(mlen) + message
return encode_str(message)
def pack_8bits_to_ucs2(message, udh=None):
# XXX: This does not control the size respect to UDH
text = message
nmesg = ''
if udh is not None:
text = udh + text
for n in text:
nmesg += chr(ord(n) >> 8) + chr(ord(n) & 0xFF)
mlen = len(text) * 2
message = chr(mlen) + nmesg
return encode_str(message)
def unpack_msg(pdu):
"""Unpacks ``pdu`` into septets and returns the decoded string"""
# Taken/modified from Dave Berkeley's pysms package
count = last = 0
result = []
for i in range(0, len(pdu), 2):
byte = int(pdu[i:i + 2], 16)
mask = 0x7F >> count
out = ((byte & mask) << count) + last
last = byte >> (7 - count)
result.append(out)
if len(result) >= 0xa0:
break
if count == 6:
result.append(last)
last = 0
count = (count + 1) % 7
return to_bytes(result)
def unpack_msg2(pdu):
"""Unpacks ``pdu`` into septets and returns the decoded string"""
# Taken/modified from Dave Berkeley's pysms package
count = last = 0
result = []
for byte in pdu:
mask = 0x7F >> count
out = ((byte & mask) << count) + last
last = byte >> (7 - count)
result.append(out)
if len(result) >= 0xa0:
break
if count == 6:
result.append(last)
last = 0
count = (count + 1) % 7
return to_bytes(result)
def timedelta_to_relative_validity(t):
"""
Convert ``t`` to its relative validity period
In case the resolution of ``t`` is too small for a time unit,
it will be floor-rounded to the previous sane value
:type t: datetime.timedelta
:return int
"""
if t < timedelta(minutes=5):
raise ValueError("Min resolution is five minutes")
if t > timedelta(weeks=63):
raise ValueError("Max validity is 63 weeks")
if t <= timedelta(hours=12):
return floor(t.seconds / (60 * 5)) - 1
if t <= timedelta(hours=24):
t -= timedelta(hours=12)
return floor(t.seconds / (60 * 30)) + 143
if t <= timedelta(days=30):
return t.days + 166
if t <= timedelta(weeks=63):
return floor(t.days / 7) + 192
def datetime_to_absolute_validity(d, tzname='Unknown'):
"""Convert ``d`` to its integer representation"""
n = d.strftime("%y %m %d %H %M %S %z").split(" ")
# compute offset
offset = FixedOffset.from_timezone(n[-1], tzname).offset
# one unit is 15 minutes
s = "%02d" % int(floor(offset.seconds / (60 * 15)))
if offset.days < 0:
# set MSB to 1
s = "%02x" % ((int(s[0]) << 4) | int(s[1]) | 0x80)
n[-1] = s
return [int(c[::-1], 16) for c in n]
|