How to use the persistence.write_uint32 function in Persistence

persistence.write_uint32(output_file, flags)
        persistence.write_uint32(output_file, processor_id)

        persistence.write_uint32(output_file, num_blocks)
        output_file_offset = output_file.tell()
        #for block in blocks:
        #    write_SegmentBlock(output_file, block, program_data.dis_constant_pc_offset)
        output_file.write(block_data_string)
        if output_file.tell() - output_file_offset != block_data_length:
            logger.error("convert_project_format_3_to_4: block length mismatch %d != %d", output_file.tell() - output_file_offset, block_data_length)
            return None

        # Update the header length field, then fast forward to the end of the hunk.
        new_hunk_length = output_file.tell() - output_file_payload_offset
        output_file.seek(output_file_length_offset, os.SEEK_SET)
        persistence.write_uint32(output_file, new_hunk_length)
        output_file.seek(new_hunk_length, os.SEEK_CUR)

        if output_file.tell() - output_file_payload_offset != new_hunk_length:
            logger.error("convert_project_format_3_to_4: block length mismatch %d != %d", output_file.tell() - output_file_payload_offset, new_hunk_length)
            return None

    return output_file

}

    input_file.seek(0, os.SEEK_END)
    file_size = input_file.tell()
    input_file.seek(0, os.SEEK_SET)

    savefile_id = persistence.read_uint32(input_file)
    savefile_version = persistence.read_uint16(input_file)
    if savefile_version != 4:
        return None

    logger.info("Upgrading save-file from version 4 to version 5: symbols by address..")
    save_count = persistence.read_uint32(input_file)

    output_file = tempfile.TemporaryFile()
    persistence.write_uint32(output_file, savefile_id)
    persistence.write_uint16(output_file, 5)
    persistence.write_uint32(output_file, save_count)

    while input_file.tell() < file_size:
        # This should be pretty straightforward.
        hunk_header_offset = input_file.tell()
        hunk_id = persistence.read_uint16(input_file)
        hunk_length = persistence.read_uint32(input_file)
        hunk_payload_offset = input_file.tell()

        actual_hunk_version = persistence.read_uint16(input_file)
        expected_hunk_version = SNAPSHOT_HUNK_VERSIONS[hunk_id]
        if expected_hunk_version != actual_hunk_version:
            logger.error("convert_project_format_4_to_5: hunk %d version mismatch %d != %d", hunk_id, expected_hunk_version, actual_hunk_version)
            return None
        logger.debug("convert_project_format_4_to_5: file hunk %d", hunk_id)

logger.info("Upgrading save-file from version 2 to version 3: Hunk versioning..")
    save_count = persistence.read_uint32(input_file)

    output_file = tempfile.TemporaryFile()
    persistence.write_uint32(output_file, savefile_id)
    persistence.write_uint16(output_file, 3)
    persistence.write_uint32(output_file, save_count)

    while input_file.tell() < file_size:
        # This should be pretty straightforward.
        hunk_id = persistence.read_uint16(input_file)
        persistence.write_uint16(output_file, hunk_id)

        input_hunk_length = persistence.read_uint32(input_file)
        output_length_offset = output_file.tell()
        persistence.write_uint32(output_file, 0)
        output_data_offset = output_file.tell()
        # Modification.
        persistence.write_uint16(output_file, SNAPSHOT_HUNK_VERSIONS[hunk_id])

        input_data = input_file.read(input_hunk_length)
        output_file.write(input_data)
        output_hunk_length = output_file.tell() - output_data_offset
        output_file.seek(output_length_offset, os.SEEK_SET)
        persistence.write_uint32(output_file, output_hunk_length)
        output_file.seek(output_hunk_length, os.SEEK_CUR)

    return output_file

}

    input_file.seek(0, os.SEEK_END)
    file_size = input_file.tell()
    input_file.seek(0, os.SEEK_SET)

    savefile_id = persistence.read_uint32(input_file)
    savefile_version = persistence.read_uint16(input_file)
    if savefile_version != 3:
        return None

    logger.info("Upgrading save-file from version 3 to version 4: Processor id field..")
    save_count = persistence.read_uint32(input_file)

    output_file = tempfile.TemporaryFile()
    persistence.write_uint32(output_file, savefile_id)
    persistence.write_uint16(output_file, 4)
    persistence.write_uint32(output_file, save_count)

    while input_file.tell() < file_size:
        # This should be pretty straightforward.
        hunk_header_offset = input_file.tell()
        hunk_id = persistence.read_uint16(input_file)
        hunk_length = persistence.read_uint32(input_file)
        hunk_payload_offset = input_file.tell()

        actual_hunk_version = persistence.read_uint16(input_file)
        expected_hunk_version = SNAPSHOT_HUNK_VERSIONS[hunk_id]
        if expected_hunk_version != actual_hunk_version:
            logger.error("convert_project_format_3_to_4: hunk %d version mismatch %d != %d", hunk_id, expected_hunk_version, actual_hunk_version)
            return None
        logger.debug("convert_project_format_3_to_4: file hunk %d", hunk_id)

def save_disassembly_hunk(f, program_data):
    persistence.write_dict_uint32_to_set_of_uint32s(f, program_data.branch_addresses)
    persistence.write_dict_uint32_to_set_of_uint32s(f, program_data.reference_addresses)
    persistence.write_dict_uint32_to_string(f, program_data.symbols_by_address)
    persistence.write_dict_uint32_to_list_of_uint32s(f, program_data.post_segment_addresses)
    persistence.write_uint32(f, program_data.flags)
    persistence.write_uint32(f, program_data.processor_id)

    persistence.write_uint32(f, len(program_data.blocks))
    for block in program_data.blocks:
        write_SegmentBlock(f, block, program_data.dis_constant_pc_offset)

def write_segment_list_entry(f, v):
    persistence.write_uint8(f, v[loaderlib.SI_TYPE])
    if v[loaderlib.SI_FILE_OFFSET] == -1:
        persistence.write_uint32(f, 0xFFFFFFFF) # Unsigned, special value.
    else:
        persistence.write_uint32(f, v[loaderlib.SI_FILE_OFFSET])
    persistence.write_uint32(f, v[loaderlib.SI_DATA_LENGTH])
    persistence.write_uint32(f, v[loaderlib.SI_LENGTH])
    persistence.write_uint32(f, v[loaderlib.SI_ADDRESS])

if SAVEFILE_HUNK_DISASSEMBLY == hunk_id:
            save_disassembly_hunk(f, program_data)
        elif SAVEFILE_HUNK_LOADER == hunk_id:
            save_loader_hunk(f, program_data)
        elif SAVEFILE_HUNK_LOADERINTERNAL == hunk_id:
            save_loaderinternaldata_hunk(f, program_data)
        elif SAVEFILE_HUNK_SOURCEDATAINFO == hunk_id:
            save_sourcedatainfo_hunk(f, program_data)
        elif SAVEFILE_HUNK_SOURCEDATA == hunk_id:
            save_sourcedata_hunk(f, program_data, save_options.input_file)
        else:
            raise RuntimeError("Trying to save a hunk with no handling to do so")
        hunk_length = f.tell() - hunk_data_offset
        # Go back and fill in the hunk length field.
        f.seek(length_offset, os.SEEK_SET)
        persistence.write_uint32(f, hunk_length)
        # Return to the end of the hunk to perhaps write the next.
        f.seek(hunk_length, os.SEEK_CUR)

    logger.info("Saved project (%d bytes)", f.tell())

# Write the as yet to be updated header.
        persistence.write_uint16(output_file, hunk_id)
        output_file_length_offset = output_file.tell()
        persistence.write_uint32(output_file, 0)
        output_file_payload_offset = output_file.tell()
        persistence.write_uint16(output_file, SNAPSHOT_HUNK_VERSIONS[SAVEFILE_HUNK_DISASSEMBLY] + 1)

        # Write the payload in the modified format.
        persistence.write_dict_uint32_to_set_of_uint32s(output_file, branch_addresses)
        persistence.write_dict_uint32_to_set_of_uint32s(output_file, reference_addresses)
        persistence.write_dict_uint32_to_string(output_file, symbols_by_address)
        persistence.write_dict_uint32_to_list_of_uint32s(output_file, post_segment_addresses)
        persistence.write_uint32(output_file, flags)
        persistence.write_uint32(output_file, processor_id)

        persistence.write_uint32(output_file, num_blocks)
        output_file_offset = output_file.tell()
        #for block in blocks:
        #    write_SegmentBlock(output_file, block, program_data.dis_constant_pc_offset)
        output_file.write(block_data_string)
        if output_file.tell() - output_file_offset != block_data_length:
            logger.error("convert_project_format_3_to_4: block length mismatch %d != %d", output_file.tell() - output_file_offset, block_data_length)
            return None

        # Update the header length field, then fast forward to the end of the hunk.
        new_hunk_length = output_file.tell() - output_file_payload_offset
        output_file.seek(output_file_length_offset, os.SEEK_SET)
        persistence.write_uint32(output_file, new_hunk_length)
        output_file.seek(new_hunk_length, os.SEEK_CUR)

        if output_file.tell() - output_file_payload_offset != new_hunk_length:
            logger.error("convert_project_format_3_to_4: block length mismatch %d != %d", output_file.tell() - output_file_payload_offset, new_hunk_length)

# The length of this instruction is not stored, so we calculate it relative to the next one.
                        j = i+1
                        while j < len(block.line_data):
                            next_type_id, next_entry = block.line_data[j]
                            if next_type_id == SLD_INSTRUCTION:
                                if type(next_entry) is int:
                                    block_offset = next_entry
                                else:
                                    block_offset = next_entry.pc - pc_offset
                                break
                            j += 1
                    else:
                        persistence.write_uint16(f, block_offset)
                        block_offset += entry.num_bytes
                elif type_id == SLD_EQU_LOCATION_RELATIVE:
                    persistence.write_uint32(f, entry) # block offset
                elif type_id in (SLD_COMMENT_TRAILING, SLD_COMMENT_FULL_LINE):
                    persistence.write_string(f, entry) # string
                else:
                    logger.error("Trying to save a savefile, did not know how to handle entry of type_id: %d, entry value: %s", type_id, entry)

def write_segment_list(f, v):
    start_offset = f.tell()
    persistence.write_uint32(f, 0)
    data_start_offset = f.tell()
    for entry in v:
        write_segment_list_entry(f, entry)
    end_offset = f.tell()
    f.seek(start_offset, os.SEEK_SET)
    persistence.write_uint32(f, end_offset - data_start_offset)
    f.seek(end_offset, os.SEEK_SET)