def parse_as_header(class_, f):
"""
Parse the Block header from the file-like object
"""
version, previous_block_hash, merkle_root, height = parse_struct("L##L", f)
# https://github.com/BTCGPU/BTCGPU/wiki/Technical-Spec
f.read(28) # reserved area
(timestamp, difficulty, nonce, solution) = parse_struct("LL#S", f)
return class_(version, previous_block_hash, merkle_root, timestamp,
difficulty, nonce, height, solution)
def parse(class_, f, allow_segwit=None):
"""Parse a Bitcoin transaction Tx.
:param f: a file-like object that contains a binary streamed transaction
:param allow_segwit: (optional) set to True to allow parsing of segwit transactions.
The default value is defined by the class variable ALLOW_SEGWIT
"""
if allow_segwit is None:
allow_segwit = class_.ALLOW_SEGWIT
txs_in = []
txs_out = []
version, = parse_struct("L", f)
v1 = ord(f.read(1))
is_segwit = allow_segwit and (v1 == 0)
v2 = None
if is_segwit:
flag = f.read(1)
if flag == b'\0':
raise ValueError("bad flag in segwit")
if flag == b'\1':
v1 = None
else:
is_segwit = False
v2 = ord(flag)
count = parse_satoshi_int(f, v=v1)
txs_in = []
for i in range(count):
txs_in.append(class_.TxIn.parse(f))
count = parse_satoshi_int(f, v=v2)
txs_out = []
for i in range(count):
txs_out.append(class_.TxOut.parse(f))
if is_segwit:
for tx_in in txs_in:
stack = []
count = parse_satoshi_int(f)
for i in range(count):
stack.append(parse_satoshi_string(f))
tx_in.witness = stack
lock_time, = parse_struct("L", f)
if (version & 0xFFFF) >= 3 and (version >> 16) & 0xFFFF != 0:
extraPayloadSize = parse_satoshi_int(f)
extraPayload = f.read(extraPayloadSize)
return class_(version, txs_in, txs_out, lock_time, None, extraPayload)
def parse(class_, f, allow_segwit=None):
"""Parse a Bitcoin transaction Tx.
:param f: a file-like object that contains a binary streamed transaction
:param allow_segwit: (optional) set to True to allow parsing of segwit transactions.
The default value is defined by the class variable ALLOW_SEGWIT
"""
if allow_segwit is None:
allow_segwit = class_.ALLOW_SEGWIT
txs_in = []
txs_out = []
version, = parse_struct("L", f)
v1 = ord(f.read(1))
is_segwit = allow_segwit and (v1 == 0)
v2 = None
if is_segwit:
flag = f.read(1)
if flag == b'\0':
raise ValueError("bad flag in segwit")
if flag == b'\1':
v1 = None
else:
is_segwit = False
v2 = ord(flag)
count = parse_satoshi_int(f, v=v1)
txs_in = []
for i in range(count):
txs_in.append(class_.TxIn.parse(f))
count = parse_satoshi_int(f, v=v2)
txs_out = []
for i in range(count):
txs_out.append(class_.TxOut.parse(f))
if is_segwit:
for tx_in in txs_in:
stack = []
count = parse_satoshi_int(f)
for i in range(count):
stack.append(parse_satoshi_string(f))
tx_in.witness = stack
lock_time, = parse_struct("L", f)
return class_(version, txs_in, txs_out, lock_time)
def parse(self, f):
return self(*parse_struct("L#", f), dont_check=True)
def parse(cls, f):
return cls(*parse_struct("QS#LIbI", f))
def parse(self, f):
return self(*parse_struct("#LSL", f))
def parse(self, f):
services, ip_bin, port = parse_struct("Q@h", f)
self.ip_bin = ip_bin
return self(services, self.ip_bin, port)
def parse(cls, f):
return cls(*parse_struct("QS", f))
def parse(self, f):
return self(*parse_struct("#LSL", f))