# -*- coding: utf-8 -*-
"""
Copyright (c) 2018 beyond-blockchain.org.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import sys
import os
current_dir = os.path.abspath(os.path.dirname(__file__))
sys.path.append(os.path.join(current_dir, "../.."))
from bbclib.libs import bbclib_utils
import bbclib
from bbclib import id_length_conf
[docs]class BBcPointer:
"""Pointer part in a transaction"""
def __init__(self, transaction_id=None, asset_id=None, id_length=None):
if id_length is not None:
bbclib.configure_id_length_all(id_length)
if transaction_id is not None:
self.transaction_id = transaction_id[:id_length_conf["transaction_id"]]
else:
self.transaction_id = None
if asset_id is not None:
self.asset_id = asset_id[:id_length_conf["asset_id"]]
else:
self.asset_id = None
def __str__(self):
ret = " transaction_id: %s\n" % bbclib_utils.str_binary(self.transaction_id)
ret += " asset_id: %s\n" % bbclib_utils.str_binary(self.asset_id)
return ret
[docs] def add(self, transaction_id=None, asset_id=None):
"""Add parts"""
if transaction_id is not None:
self.transaction_id = transaction_id[:id_length_conf["transaction_id"]]
if asset_id is not None:
self.asset_id = asset_id[:id_length_conf["asset_id"]]
[docs] def pack(self):
"""Pack this object
Returns:
bytes: packed binary data
"""
dat = bytearray(bbclib_utils.to_bigint(self.transaction_id, size=id_length_conf["transaction_id"]))
if self.asset_id is None:
dat.extend(bbclib_utils.to_2byte(0))
else:
dat.extend(bbclib_utils.to_2byte(1))
dat.extend(bbclib_utils.to_bigint(self.asset_id, size=id_length_conf["asset_id"]))
return bytes(dat)
[docs] def unpack(self, data):
"""Unpack into this object
Args:
data (bytes): packed binary data
Returns:
bool: True if successful
"""
ptr = 0
try:
ptr, self.transaction_id = bbclib_utils.get_bigint(ptr, data)
ptr, num = bbclib_utils.get_n_byte_int(ptr, 2, data)
if num == 1:
ptr, self.asset_id = bbclib_utils.get_bigint(ptr, data)
id_length_conf["asset_id"] = len(self.asset_id)
else:
self.asset_id = None
except:
return False
return True