def decode_from_reader( self, reader: serialization.BinaryReader) -> EllipticCurve.ECPoint: """ Raises: NotImplementedError: if an unsupported point encoding is used TypeError: if unexpected encoding is read """ try: f = reader.read_byte() except ValueError: return self.Infinity f = int.from_bytes(f, "little") if f == 0: return self.Infinity # these are compressed if f == 2 or f == 3: yTilde = f & 1 data = bytearray(reader.read_bytes(32)) data.reverse() data.append(0) X1 = int.from_bytes(data, 'little') return self.decompress_from_curve(X1, yTilde) # uncompressed or hybrid elif f == 4 or f == 6 or f == 7: raise NotImplementedError() raise ValueError(f"Invalid point encoding: {f}")
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. Raises: ValueError: if the content count of the block is zero, or if there is a duplicate transaction in the list, or if the merkle root does not included the calculated root. """ super(Block, self).deserialize(reader) content_count = reader.read_var_int(max=self.MAX_CONTENTS_PER_BLOCK) if content_count == 0: raise ValueError("Deserialization error - no contents") self.consensus_data = reader.read_serializable(payloads.ConsensusData) tx_count = content_count - 1 for _ in range(tx_count): self.transactions.append(reader.read_serializable(payloads.Transaction)) if len(set(self.transactions)) != tx_count: raise ValueError("Deserialization error - block contains duplicate transaction") hashes = [t.hash() for t in self.transactions] if Block.calculate_merkle_root(self.consensus_data.hash(), hashes) != self.merkle_root: raise ValueError("Deserialization error - merkle root mismatch")
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.config = MessageConfig(reader.read_uint8()) x = reader.read_uint8() self.type = MessageType(x) # self.type = MessageType(reader.read_uint8()) payload_data = reader.read_var_bytes(self.PAYLOAD_MAX_SIZE) if len(payload_data) > 0: if MessageConfig.COMPRESSED in self.config: # From the lz4 documentation: # "The uncompressed_size argument specifies an upper bound on the size of the uncompressed data size # rather than an absolute value" try: size = int.from_bytes(payload_data[:4], 'little') payload_data = lz4.block.decompress(payload_data[4:], uncompressed_size=size) except lz4.block.LZ4BlockError: raise ValueError( "Invalid payload data - decompress failed") self.payload = self._payload_from_data(self.type, payload_data) if self.payload is None: self.payload = payloads.EmptyPayload()
def _deserialize_without_type(self, reader: serialization.BinaryReader) -> None: self.id = reader.read_uint64() self.code = OracleReponseCode(reader.read_uint8()) self.result = reader.read_var_bytes(self._MAX_RESULT_SIZE) if self.code != OracleReponseCode.SUCCESS and len(self.result) > 0: raise ValueError( f"Deserialization error - oracle response: {self.code}")
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.invocation_script = reader.read_var_bytes(max=self._MAX_INVOCATION_SCRIPT) self.verification_script = reader.read_var_bytes(max=self._MAX_VERIFICATION_SCRIPT)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.header = reader.read_serializable(Header) self.hashes = reader.read_serializable_list(types.UInt256, max=0xFFFF)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.usage = TransactionAttributeUsage(reader.read_uint8()) self.data = reader.read_var_bytes(max=252)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.type = ConsensusMessageType(reader.read_uint8()) self.view_number = reader.read_uint8()
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.invocation_script = reader.read_var_bytes(max=664) self.verification_script = reader.read_var_bytes(max=360)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.hash_start = reader.read_serializable(types.UInt256) self.count = reader.read_int16()
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.type = InventoryType(reader.read_uint8()) self.hashes = reader.read_serializable_list(types.UInt256)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.current_height = reader.read_uint32() self.timestamp = reader.read_uint32() self.nonce = reader.read_uint32()
def deserialize_unsigned(self, reader: serialization.BinaryReader) -> None: self.category = reader.read_var_string(32) self.valid_block_start = reader.read_uint32() self.valid_block_end = reader.read_uint32() if self.valid_block_start >= self.valid_block_end: raise ValueError( "Deserialization error - valid_block_starts is bigger than valid_block_end" ) self.sender = reader.read_serializable(types.UInt160) self.data = reader.read_var_bytes(message.Message.PAYLOAD_MAX_SIZE)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.primary_index = reader.read_var_int( max=1024) # comes from C#'s Clockchain.MaxValidators self.nonce = reader.read_uint64()
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.id = reader.read_int32() remaining_stream_size = len(reader) - reader._stream.tell() self.key = reader.read_bytes(remaining_stream_size)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.major = reader.read_int32() self.minor = reader.read_int32() self.build = reader.read_int32() self.revision = reader.read_int32()
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.header = reader.read_serializable(Header) self.tx_count = reader.read_var_int(max=0xFFFF) self.hashes = reader.read_serializable_list(types.UInt256, max=self.tx_count) self.flags = reader.read_var_bytes(max=(max(self.tx_count, 1) + 7) // 8)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ super(MerkleBlockPayload, self).deserialize(reader) self.content_count = reader.read_var_int() self.hashes = reader.read_serializable_list(types.UInt256) self.flags = reader.read_var_bytes()
def deserialize(self, reader: serialization.BinaryReader) -> None: length = reader.read_var_int() if self._validators is None: self._validators = {} else: self._validators.clear() for _ in range(length): public_key = reader.read_serializable( cryptography.ECPoint) # type: ignore self._validators.update( {public_key: vm.BigInteger(reader.read_var_bytes())})
def deserialize_unsigned(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream excluding the validation byte + witness. Args: reader: instance. """ self.version = reader.read_uint32() self.prev_hash = reader.read_serializable(types.UInt256) self.block_index = reader.read_uint32() self.validator_index = reader.read_uint16() self.data = reader.read_var_bytes()
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.hash = reader.read_serializable(types.UInt160) self.method = reader.read_var_string(32) self.parameters_count = reader.read_uint16() self.has_return_value = bool(reader.read_uint8()) self.call_flags = contracts.CallFlags(reader.read_uint8())
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.filter = reader.read_var_bytes(max=36000) self.K = reader.read_uint8() if self.K > 50: raise ValueError("Deserialization error - K exceeds limit of 50") self.tweak = reader.read_uint32()
def _deserialize_signers(reader: serialization.BinaryReader, max_count: int) -> List[payloads.Signer]: count = reader.read_var_int(max_count) if count == 0: raise ValueError("Deserialization error - signers can't be empty") values: List[payloads.Signer] = [] for i in range(0, count): signer = reader.read_serializable(payloads.Signer) if signer in values: raise ValueError("Deserialization error - duplicate signer") values.append(signer) return values
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. Raises: ValueError: if the validation byte is not 1 """ self.deserialize_unsigned(reader) if reader.read_uint8() != 1: raise ValueError("Deserialization error - validation byte not 1") self.witness = reader.read_serializable(payloads.Witness)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. Raises: ValueError: if no witnesses are found. """ self.deserialize_unsigned(reader) witness_obj_count = reader.read_uint8() if witness_obj_count != 1: raise ValueError(f"Deserialization error - Witness object count is {witness_obj_count} must be 1") self.witness = reader.read_serializable(payloads.Witness)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. Raises: ValueError: if `count` is zero or exceeds :const:`~neo3.network.payloads.getblocks.GetBlockByIndexPayload.MAX_BLOCKS_COUNT`. """ self.index_start = reader.read_uint32() self.count = reader.read_int16() if self.count < 1 or self.count == 0 or self.count > HeadersPayload.MAX_HEADERS_COUNT: raise ValueError("Deserialization error - invalid count")
def deserialize_unsigned(self, reader: serialization.BinaryReader) -> None: """ Deserialize the unsigned data part of the object from a binary stream. Args: reader: instance. Raises: ValueError: The version is not zero. ValueError: If the system of network fee is negative. ValueError: If there is no script """ (self.version, self.nonce, self.system_fee, self.network_fee, self.valid_until_block) = struct.unpack("<BIqqI", reader._stream.read(25)) if self.version > 0: raise ValueError("Deserialization error - invalid version") if self.system_fee < 0: raise ValueError("Deserialization error - negative system fee") if self.network_fee < 0: raise ValueError("Deserialization error - negative network fee") self.signers = Transaction._deserialize_signers(reader, self.MAX_TRANSACTION_ATTRIBUTES) self.attributes = Transaction._deserialize_attributes(reader, self.MAX_TRANSACTION_ATTRIBUTES - len(self.signers)) self.script = reader.read_var_bytes(max=65535) if len(self.script) == 0: raise ValueError("Deserialization error - invalid script length 0")
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.headers = reader.read_serializable_list(Header)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self.data = reader.read_var_bytes(520)
def deserialize(self, reader: serialization.BinaryReader) -> None: """ Deserialize the object from a binary stream. Args: reader: instance. """ self._data = bytes(reader.read_bytes(self._BYTE_LEN))