def decode(self, shareable_index=None):
"""
Decode the next value from the stream.
:raises EOFError: if EOF is encountered while reading
:raises CBORDecodeError: if there is any problem decoding the stream
"""
byte = self.fp.read(1)
if not byte:
raise EOFError()
try:
initial_byte = byte_as_integer(byte)
major_type = initial_byte >> 5
subtype = initial_byte & 31
except Exception as e:
raise CBORDecodeError('error reading major type at index {}: {}'
.format(self.fp.tell(), e))
decoder = major_decoders[major_type]
try:
return decoder(self, subtype, shareable_index)
except CBORDecodeError:
raise
except Exception as e:
raise CBORDecodeError('error decoding value at index {}: {}'.format(self.fp.tell(), e))
def decode_bytestring(decoder, subtype, shareable_index=None):
# Major tag 2
length = decode_uint(decoder, subtype, allow_infinite=True)
if length is None:
# Indefinite length
buf = bytearray()
while True:
initial_byte = byte_as_integer(decoder.read(1))
if initial_byte == 255:
return buf
else:
length = decode_uint(decoder, initial_byte & 31)
value = decoder.read(length)
buf.extend(value)
else:
return decoder.read(length)
def decode_bytestring(self, subtype, fp, shareable_index=None):
# Major tag 2
length = self.decode_uint(subtype, fp, allow_infinite=True)
if length is None:
# Indefinite length
buf = bytearray()
while True:
initial_byte = byte_as_integer(fp.read(1))
if initial_byte == 255:
return buf
else:
length = self.decode_uint(initial_byte & 31, fp)
value = fp.read(length)
buf.extend(value)
else:
return fp.read(length)
def decode(self, fp, shareable_index=None):
"""Decode the next value from the stream."""
try:
initial_byte = byte_as_integer(fp.read(1))
major_type = initial_byte >> 5
subtype = initial_byte & 31
except Exception as e:
raise CBORDecodeError('error reading major type at index {}: {}'
.format(fp.tell(), e))
decoder = self.major_decoders[major_type]
try:
return decoder(self, subtype, fp, shareable_index)
except CBORDecodeError:
raise
except Exception as e:
raise CBORDecodeError('error decoding value at index {}: {}'.format(fp.tell(), e))