def encode_int(self, value, permit_bignum=True):
'''Encode an integer as major value 0 or 1 if possible, otherwise as a tagged bignum if
permit_bignum is True.
'''
try:
if value >= 0:
return pack_cbor_length(value, 0x00)
else:
return pack_cbor_length(-1 - value, 0x20)
except OverflowError:
pass
if permit_bignum:
return self.encode_bignum(value)
raise EncodingError(
f'overflow encoding {value:,d} as a standard integer')
def encode_sorted_dict(self, kv_pairs, sort_method):
encode_item = self.encode_item
pairs_gen = ((encode_item(key), value) for key, value in kv_pairs)
length = pack_cbor_length(len(kv_pairs), 0xa0)
return length + bjoin(
encoded_key + encode_item(value)
for encoded_key, value in sorted_pairs(pairs_gen, sort_method))
def encode_tag(self, value):
return pack_cbor_length(value, 0xc0)
def encode_sorted_list(self, value):
length = pack_cbor_length(len(value), 0x80)
encode_item = self.encode_item
encoded_items_gen = (encode_item(item) for item in value)
return length + bjoin(sorted_items(encoded_items_gen,
self.sort_method))
def _make_list(self, length, encoded_items_gen):
return pack_cbor_length(length, 0x80) + bjoin(encoded_items_gen)
def encode_text_string(self, value):
value_utf8 = value.encode()
return pack_cbor_length(len(value_utf8), 0x60) + value_utf8
def encode_byte_string(self, value):
return pack_cbor_length(len(value), 0x40) + value
def __encode_cbor__(self, encoder):
return pack_cbor_length(self.tag, 0xc0) + encoder.encode_item(
self.value)