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
|
from __future__ import (absolute_import, print_function, division)
def isascii(s):
try:
s.decode("ascii")
except ValueError:
return False
return True
# best way to do it in python 2.x
def bytes_to_int(i):
return int(i.encode('hex'), 16)
def cleanBin(s, fixspacing=False):
"""
Cleans binary data to make it safe to display. If fixspacing is True,
tabs, newlines and so forth will be maintained, if not, they will be
replaced with a placeholder.
"""
parts = []
for i in s:
o = ord(i)
if (o > 31 and o < 127):
parts.append(i)
elif i in "\n\t" and not fixspacing:
parts.append(i)
else:
parts.append(".")
return "".join(parts)
def hexdump(s):
"""
Returns a set of tuples:
(offset, hex, str)
"""
parts = []
for i in range(0, len(s), 16):
o = "%.10x" % i
part = s[i:i + 16]
x = " ".join("%.2x" % ord(i) for i in part)
if len(part) < 16:
x += " "
x += " ".join(" " for i in range(16 - len(part)))
parts.append(
(o, x, cleanBin(part, True))
)
return parts
def setbit(byte, offset, value):
"""
Set a bit in a byte to 1 if value is truthy, 0 if not.
"""
if value:
return byte | (1 << offset)
else:
return byte & ~(1 << offset)
def getbit(byte, offset):
mask = 1 << offset
if byte & mask:
return True
|
