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
|
# -*- coding: utf-8 -*-
#
# AWL simulator - utility functions
# Copyright 2012-2013 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
import sys
import os
import random
import struct
class AwlSimError(Exception):
pass
class AwlParserError(Exception):
pass
# isPyPy is True, if the interpreter is PyPy.
isPyPy = "PyPy" in sys.version
# isPy3Compat is True, if the interpreter is Python 3 compatible.
isPy3Compat = sys.version_info[0] == 3
# isPy2Compat is True, if the interpreter is Python 2 compatible.
isPy2Compat = sys.version_info[0] == 2
# Python 2/3 helper selection
def py23(py2, py3):
if isPy3Compat:
return py3
if isPy2Compat:
return py2
raise AwlSimError("Failed to detect Python version")
# Always map input() to text input
if isPy2Compat:
input = raw_input
# Info message helper
def printInfo(text):
sys.stdout.write(text)
sys.stdout.write("\n")
sys.stdout.flush()
# Error message helper
def printError(text):
sys.stderr.write(text)
sys.stderr.write("\n")
sys.stderr.flush()
def awlFileRead(filename):
try:
fd = open(filename, "rb")
data = fd.read()
data = data.decode("latin_1")
fd.close()
except (IOError, UnicodeError) as e:
raise AwlParserError("Failed to read '%s': %s" %\
(filename, str(e)))
return data
def awlFileWrite(filename, data):
data = "\r\n".join(data.splitlines()) + "\r\n"
for count in range(1000):
tmpFile = "%s-%d-%d.tmp" %\
(filename, random.randint(0, 0xFFFF), count)
if not os.path.exists(tmpFile):
break
else:
raise AwlParserError("Could not create temporary file")
try:
fd = open(tmpFile, "wb")
fd.write(data.encode("latin_1"))
fd.flush()
fd.close()
if os.name.lower() != "posix":
# Can't use safe rename on non-POSIX.
# Must unlink first.
os.unlink(filename)
os.rename(tmpFile, filename)
except (IOError, OSError, UnicodeError) as e:
raise AwlParserError("Failed to write file:\n" + str(e))
finally:
try:
os.unlink(tmpFile)
except (IOError, OSError):
pass
def swapEndianWord(word):
return ((word & 0x00FF) << 8) |\
((word & 0xFF00) >> 8)
def swapEndianDWord(dword):
return ((dword & 0x000000FF) << 24) |\
((dword & 0x0000FF00) << 8) |\
((dword & 0x00FF0000) >> 8) |\
((dword & 0xFF000000) >> 24)
def byteToSignedPyInt(byte):
if byte & 0x80:
return -((~byte + 1) & 0xFF)
return byte & 0xFF
def wordToSignedPyInt(word):
if word & 0x8000:
return -((~word + 1) & 0xFFFF)
return word & 0xFFFF
def dwordToSignedPyInt(dword):
if dword & 0x80000000:
return -((~dword + 1) & 0xFFFFFFFF)
return dword & 0xFFFFFFFF
def __rawPyFloatToDWord_python2(pyfl):
buf = struct.pack('>f', pyfl)
return (ord(buf[0]) << 24) |\
(ord(buf[1]) << 16) |\
(ord(buf[2]) << 8) |\
ord(buf[3])
def __rawPyFloatToDWord_python3(pyfl):
buf = struct.pack('>f', pyfl)
return (buf[0] << 24) |\
(buf[1] << 16) |\
(buf[2] << 8) |\
buf[3]
rawPyFloatToDWord = py23(__rawPyFloatToDWord_python2,
__rawPyFloatToDWord_python3)
def pyFloatToDWord(pyfl):
dword = rawPyFloatToDWord(pyfl)
if isDenormalPyFloat(pyfl):
# Denormal floats are equal to zero on the S7 CPU.
# OV and OS flags are set in the StatusWord handler.
dword = 0x00000000
elif (dword & 0x7FFFFFFF) > 0x7F800000:
# NaNs are always all-ones on the S7 CPU.
dword = 0xFFFFFFFF
return dword
def __dwordToPyFloat_python2(dword):
return struct.unpack('>f',
chr((dword >> 24) & 0xFF) +\
chr((dword >> 16) & 0xFF) +\
chr((dword >> 8) & 0xFF) +\
chr(dword & 0xFF)
)[0]
def __dwordToPyFloat_python3(dword):
return struct.unpack('>f',
bytes( ((dword >> 24) & 0xFF,
(dword >> 16) & 0xFF,
(dword >> 8) & 0xFF,
dword & 0xFF)
)
)[0]
dwordToPyFloat = py23(__dwordToPyFloat_python2,
__dwordToPyFloat_python3)
# The smallest normalized positive 32-bit float.
minNormPosFloat32 = dwordToPyFloat(0x00000001)
# The smallest normalized negative 32-bit float.
minNormNegFloat32 = dwordToPyFloat(0xFF7FFFFF)
# The biggest normalized negative 32-bit float.
maxNormNegFloat32 = dwordToPyFloat(0x80000001)
# The biggest normalized positive 32-bit float.
maxNormPosFloat32 = dwordToPyFloat(0x7F7FFFFF)
# Positive infinity
posInfDWord = 0x7F800000
posInfFloat = dwordToPyFloat(posInfDWord)
# Negative infinity
negInfDWord = 0xFF800000
negInfFloat = dwordToPyFloat(negInfDWord)
# Positive NaN
pNaNDWord = 0x7FFFFFFF
# Negative NaN
nNaNDWord = 0xFFFFFFFF
nNaNFloat = dwordToPyFloat(nNaNDWord)
# Check if dword is positive or negative NaN
def isNaN(dword):
return (dword & 0x7FFFFFFF) > 0x7F800000
def isDenormalPyFloat(pyfl):
return (pyfl > 0.0 and pyfl < minNormPosFloat32) or\
(pyfl < 0.0 and pyfl > maxNormNegFloat32)
def pyFloatEqual(pyfl0, pyfl1):
return abs(pyfl0 - pyfl1) < 0.000001
def floatEqual(fl0, fl1):
if not isinstance(fl0, float):
fl0 = dwordToPyFloat(fl0)
if not isinstance(fl1, float):
fl1 = dwordToPyFloat(fl1)
return pyFloatEqual(fl0, fl1)
def intDivRoundUp(n, d):
return (n + d - 1) // d
# Returns the index of a list element, or -1 if not found.
def listIndex(_list, value, start=0, stop=-1):
if stop < 0:
stop = len(_list)
try:
return _list.index(value, start, stop)
except ValueError:
return -1
def str2bool(string, default=False):
s = string.lower()
if s in ("true", "yes", "on"):
return True
if s in ("false", "no", "off"):
return False
try:
return bool(int(s, 10))
except ValueError:
return default
|
