def from_bytes(b):
""" Deserializes a byte stream into a Transaction.
Args:
b (bytes): byte stream starting with the version.
Returns:
tuple: First element of the tuple is the Transaction,
second is the remainder of the byte stream.
"""
# First 4 bytes are version
version = struct.unpack('<I', b[:4])[0]
b1 = b[4:]
# Work on inputs
num_inputs, b1 = unpack_compact_int(b1)
inputs = []
for i in range(num_inputs):
inp, b1 = TransactionInput.from_bytes(b1)
inputs.append(inp)
# Work on outputs
num_outputs, b1 = unpack_compact_int(b1)
outputs = []
for o in range(num_outputs):
out, b1 = TransactionOutput.from_bytes(b1)
outputs.append(out)
# Lock time
lock_time = struct.unpack('<I', b1[:4])[0]
return (Transaction(version, inputs, outputs, lock_time), b1[4:])
def from_bytes(b):
""" Deserializes a byte stream into a Transaction.
Args:
b (bytes): byte stream starting with the version.
Returns:
tuple:
First element of the tuple is the Transaction,
second is the remainder of the byte stream.
"""
# First 4 bytes are version
version = struct.unpack('<I', b[:4])[0]
b1 = b[4:]
# Work on inputs
num_inputs, b1 = unpack_compact_int(b1)
inputs = []
for i in range(num_inputs):
inp, b1 = TransactionInput.from_bytes(b1)
inputs.append(inp)
# Work on outputs
num_outputs, b1 = unpack_compact_int(b1)
outputs = []
for o in range(num_outputs):
out, b1 = TransactionOutput.from_bytes(b1)
outputs.append(out)
# Lock time
lock_time = struct.unpack('<I', b1[:4])[0]
return (Transaction(version, inputs, outputs, lock_time), b1[4:])
def from_bytes(b):
""" Deserializes a byte stream into a TransactionOutput object.
Args:
b (bytes): byte-stream beginning with the value.
Returns:
tuple: First element of the tuple is a TransactionOutput,
the second is the remainder of the byte stream.
"""
value, b0 = unpack_u64(b)
script_len, b0 = unpack_compact_int(b0)
return (TransactionOutput(value, Script(b0[:script_len])),
b0[script_len:])
def from_bytes(b):
""" Deserializes a byte stream into a TransactionOutput object.
Args:
b (bytes): byte-stream beginning with the value.
Returns:
tuple:
First element of the tuple is a TransactionOutput,
the second is the remainder of the byte stream.
"""
value, b0 = unpack_u64(b)
script_len, b0 = unpack_compact_int(b0)
return (TransactionOutput(value, Script(b0[:script_len])),
b0[script_len:])
def from_bytes(b):
""" Creates a Block from a serialized byte stream.
Args:
b (bytes): The byte stream, starting with the block version.
Returns:
block, b (tuple): A tuple. The first item is the deserialized block
and the second is the remainder of the byte stream.
"""
bh, b = BlockHeader.from_bytes(b)
num_txns, b = unpack_compact_int(b)
txns = []
for i in range(num_txns):
t, b = Transaction.from_bytes(b)
txns.append(t)
return Block.from_blockheader(bh, txns), b
def from_bytes(b):
""" Creates a Block from a serialized byte stream.
Args:
b (bytes): The byte stream, starting with the block version.
Returns:
block, b (tuple): A tuple. The first item is the deserialized block
and the second is the remainder of the byte stream.
"""
bh, b = BlockHeader.from_bytes(b)
num_txns, b = unpack_compact_int(b)
txns = []
for i in range(num_txns):
t, b = Transaction.from_bytes(b)
txns.append(t)
return Block.from_blockheader(bh, txns), b