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# -*- 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
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