parse_block.py

import os
import struct
from io import BytesIO
from pycoin.block import Block

def read_uint32(fd):
    return struct.unpack(b'<I', fd.read(4))[0]

def parse_file(block_file):

    basename = os.path.basename(block_file)

    with open(block_file, 'rb') as fd:
        fd.seek(-1, os.SEEK_END)
        file_end = fd.tell()
        fd.seek(0)

        while fd.tell() < file_end:
            # Skip the magic bytes
            fd.seek(4, os.SEEK_CUR)

            position = fd.tell()
            block_length = read_uint32(fd)
            bio = BytesIO(fd.read(block_length))
            yield basename, position, block_length, Block.parse(bio)