def read_value(self, istream):
if self.length is not self.LENGTH:
raise errors.ReadValueError(Integer.__name__, 'length',
self.LENGTH, self.length)
self.value = unpack(self.pack_string, istream.read(self.length))[0]
pad = unpack(self.pack_string, istream.read(self.padding_length))[0]
if pad is not 0:
raise errors.ReadValueError(Integer.__name__, 'pad', 0, pad)
self.validate()
def read_type(self, istream):
# Read in the bytes for the type
tts = istream.read(self.TYPE_SIZE)
num_bytes = len(tts)
if num_bytes != self.TYPE_SIZE:
min_bytes = 'a minimum of {0} bytes'.format(self.TYPE_SIZE)
raise errors.ReadValueError(Base.__name__, 'type', min_bytes,
'{0} bytes'.format(num_bytes))
typ = unpack('!B', tts)[0]
enum_typ = enums.Types(typ)
if enum_typ is not self.type:
raise errors.ReadValueError(Base.__name__, 'type',
self.type.value, typ)
def read_length(self, istream):
# Read in the bytes for the length
lst = istream.read(self.LENGTH_SIZE)
num_bytes = len(lst)
if num_bytes != self.LENGTH_SIZE:
min_bytes = 'a minimum of {0} bytes'.format(self.LENGTH_SIZE)
raise errors.ReadValueError(Base.__name__, 'length', min_bytes,
'{0} bytes'.format(num_bytes))
self.length = unpack('!I', lst)[0]
def read_tag(self, istream):
# Read in the bytes for the tag
tts = istream.read(self.TAG_SIZE)
tag = unpack('!I', b'\x00' + tts[0:self.TAG_SIZE])[0]
enum_tag = enums.Tags(tag)
# Verify that the tag matches for the current object
if enum_tag is not self.tag:
raise errors.ReadValueError(Base.__name__, 'tag',
hex(self.tag.value), hex(tag))
def read_value(self, istream):
# Read string text
self.value = ''
for _ in range(self.length):
c = unpack(self.BYTE_FORMAT, istream.read(1))[0]
if sys.version >= '3':
c = c.decode()
self.value += c
# Read padding and check content
self.padding_length = self.PADDING_SIZE - (self.length %
self.PADDING_SIZE)
if self.padding_length < self.PADDING_SIZE:
for _ in range(self.padding_length):
pad = unpack('!B', istream.read(1))[0]
if pad is not 0:
raise errors.ReadValueError(TextString.__name__, 'pad', 0,
pad)
def read_value(self, istream):
# Read bytes into bytearray
data = bytearray()
for _ in range(self.length):
data.append(istream.read(1)[0])
self.value = bytes(data)
# Read padding and check content
self.padding_length = self.PADDING_SIZE - (self.length %
self.PADDING_SIZE)
if self.padding_length == self.PADDING_SIZE:
self.padding_length = 0
if self.padding_length < self.PADDING_SIZE:
for _ in range(self.padding_length):
pad = unpack('!B', istream.read(1))[0]
if pad is not 0:
raise errors.ReadValueError(TextString.__name__, 'pad', 0,
pad)
