def from_bytes(b): """ Creates a BlockHeader object from a serialized bytestream. This function "eats" the bytestream and returns the remainder of the stream after deserializing the fields of the BlockHeader. Args: b (bytes): bytes beginning with the (4-byte) version. Returns: bh, b (tuple): A tuple containing two elements - a BlockHeader object and the remainder of the bytestream after deserialization. """ version, b = unpack_u32(b) prev_block_hash, b = Hash(b[0:32]), b[32:] merkle_root_hash, b = Hash(b[0:32]), b[32:] time, b = unpack_u32(b) bits, b = unpack_u32(b) nonce, b = unpack_u32(b) return ( BlockHeader(version, prev_block_hash, merkle_root_hash, time, bits, nonce), b )
def from_bytes(b): """ Deserializes a byte stream into a TransactionInput. Args: b (bytes): byte stream starting with the outpoint. Returns: tuple: First element of the tuple is the TransactionInput object and the second is the remaining byte stream. """ outpoint = b[0:32] outpoint_index, b1 = unpack_u32(b[32:]) script, b1 = Script.from_bytes(b1) sequence_num, b1 = unpack_u32(b1) return (TransactionInput(Hash(outpoint), outpoint_index, script, sequence_num), b1)