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# Copyright (c) 2014 Kontron Europe GmbH
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import sys
import codecs
from array import array
from .msgs import constants
from .errors import DecodingError, CompletionCodeError
_PY3 = (sys.version_info >= (3,))
def py3enc_unic_bytes_fix(dat):
# python 3 unicode fix
if isinstance(dat, str) and _PY3:
dat = dat.encode('raw_unicode_escape')
return dat
def py3dec_unic_bytes_fix(dat):
# python 3 unicode fix
if _PY3:
return dat.decode('raw_unicode_escape')
return dat
def py3_array_frombytes(msg, data):
if _PY3:
return msg.frombytes(data)
else:
return msg.fromstring(data)
def py3_array_tobytes(msg):
if _PY3:
return msg.tobytes()
else:
return msg.tostring()
def check_completion_code(cc):
if cc != constants.CC_OK:
raise CompletionCodeError(cc)
def check_rsp_completion_code(rsp):
"""
Check the completion code of a specific response and raise
CompletionCodeError in case there's an error.
This method allows to pass more metadata than the `check_completion_code`
method to try to interpret command-specific completion codes description in
case there is an error.
`rsp` should be a subclass of `Message` here.
"""
if rsp.completion_code != constants.CC_OK:
raise CompletionCodeError(
rsp.completion_code,
cmdid=rsp.cmdid,
netfn=rsp.netfn & 0xfe, # Get the request NetFn from response NetFn
group_extension=rsp.group_extension)
def chunks(data, count):
for i in range(0, len(data), count):
yield data[i:i+count]
class ByteBuffer(object):
def __init__(self, data=None):
if data is not None:
self.array = array('B', data)
else:
self.array = array('B')
def push_unsigned_int(self, value, length):
for i in range(length):
self.array.append((value >> (8*i) & 0xff))
def pop_unsigned_int(self, length):
value = 0
for i in range(length):
try:
value |= self.array.pop(0) << (8*i)
except IndexError:
raise DecodingError('Data too short for message')
return value
def push_string(self, value):
if _PY3 and isinstance(value, str):
# Encode Unicode to UTF-8
value = value.encode()
py3_array_frombytes(self.array, value)
def pop_string(self, length):
string = self.array[0:length]
del self.array[0:length]
return py3_array_tobytes(string)
# return py3dec_unic_bytes_fix(string.tostring())
def pop_slice(self, length):
if len(self.array) < length:
raise DecodingError('Data too short for message')
c = ByteBuffer(self.array[0:length])
self.__delslice__(0, length)
return c
def tobytes(self):
return self.array.tobytes()
def tostring(self):
return py3_array_tobytes(self.array)
def extend(self, data):
self.array.extend(data)
def append_array(self, a):
self.array.extend(a)
def __getslice__(self, a, b):
return self.array[a:b]
def __delslice__(self, a, b):
del self.array[a:b]
def __len__(self):
return len(self.array)
def __getitem__(self, idx):
return self.array[idx]
BCD_MAP = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ' ', '-', '.']
def bcd_encode(input, errors='strict'):
raise NotImplementedError()
def bcd_decode(encoded_input):
chars = list()
try:
for data in encoded_input:
if not _PY3:
data = ord(data)
chars.append(BCD_MAP[data >> 4 & 0xf] + BCD_MAP[data & 0xf])
return (''.join(chars), len(encoded_input) * 2)
except IndexError:
raise ValueError()
def bcd_search(name):
# Python 3.9 normalizes 'bcd+' as 'bcd_'
if name not in ('bcd+', 'bcd'):
return None
return codecs.CodecInfo(name='bcd+', encode=bcd_encode, decode=bcd_decode)
def is_string(string):
if _PY3:
return isinstance(string, str)
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