def generate(self, values):
source = BCDataStream()
for opcode in self.opcodes:
if isinstance(opcode, PUSH_SINGLE):
data = values[opcode.name]
source.write_many(push_data(data))
elif isinstance(opcode, PUSH_INTEGER):
data = values[opcode.name]
source.write_many(
push_data(
data.to_bytes((data.bit_length() + 7) // 8,
byteorder='little')))
elif isinstance(opcode, PUSH_SUBSCRIPT):
data = values[opcode.name]
source.write_many(push_data(data.source))
elif isinstance(opcode, PUSH_MANY):
for data in values[opcode.name]:
source.write_many(push_data(data))
elif isinstance(opcode, SMALL_INTEGER):
data = values[opcode.name]
source.write_many(push_small_integer(data))
else:
source.write_uint8(opcode)
return source.get_bytes()
def tokens(self):
return tokenize(BCDataStream(self.source))
def size(self) -> int:
""" Size of this input / output in bytes. """
stream = BCDataStream()
self.serialize_to(stream)
return len(stream.get_bytes())
def _serialize_for_signature(self, signing_input: int) -> bytes:
stream = BCDataStream()
stream.write_uint32(self.version)
stream.write_compact_size(len(self._inputs))
for i, txin in enumerate(self._inputs):
if signing_input == i:
assert txin.txo_ref.txo is not None
txin.serialize_to(stream, txin.txo_ref.txo.script.source)
else:
txin.serialize_to(stream, b'')
stream.write_compact_size(len(self._outputs))
for txout in self._outputs:
txout.serialize_to(stream)
stream.write_uint32(self.locktime)
stream.write_uint32(self.signature_hash_type(1)) # signature hash type: SIGHASH_ALL
return stream.get_bytes()
def _serialize(self, with_inputs: bool = True) -> bytes:
stream = BCDataStream()
stream.write_uint32(self.version)
if with_inputs:
stream.write_compact_size(len(self._inputs))
for txin in self._inputs:
txin.serialize_to(stream)
stream.write_compact_size(len(self._outputs))
for txout in self._outputs:
txout.serialize_to(stream)
stream.write_uint32(self.locktime)
return stream.get_bytes()
def _deserialize(self):
if self._raw is not None:
stream = BCDataStream(self._raw)
self.version = stream.read_uint32()
input_count = stream.read_compact_size()
if input_count == 0:
self.is_segwit_flag = stream.read_uint8()
input_count = stream.read_compact_size()
self._add(self._inputs, [
self.input_class.deserialize_from(stream) for _ in range(input_count)
])
output_count = stream.read_compact_size()
self._add(self._outputs, [
self.output_class.deserialize_from(stream) for _ in range(output_count)
])
if self.is_segwit_flag:
# drain witness portion of transaction
# too many witnesses for no crime
self.witnesses = []
for _ in range(input_count):
for _ in range(stream.read_compact_size()):
self.witnesses.append(stream.read(stream.read_compact_size()))
self.locktime = stream.read_uint32()
def test_write_read(self):
s = BCDataStream()
s.write_string(b'a' * 252)
s.write_string(b'b' * 254)
s.write_string(b'c' * (0xFFFF + 1))
# s.write_string(b'd'*(0xFFFFFFFF + 1))
s.write_boolean(True)
s.write_boolean(False)
s.reset()
self.assertEqual(s.read_string(), b'a' * 252)
self.assertEqual(s.read_string(), b'b' * 254)
self.assertEqual(s.read_string(), b'c' * (0xFFFF + 1))
# self.assertEqual(s.read_string(), b'd'*(0xFFFFFFFF + 1))
self.assertTrue(s.read_boolean())
self.assertFalse(s.read_boolean())