C1_binary_reader.py

"""
C1: Binary File Structure Reader
Reads structured binary records and allows appending new records.
"""

import struct

FILE_NAME = "records.bin"
RECORD_FORMAT = "i20sd"
RECORD_SIZE = struct.calcsize(RECORD_FORMAT)


def read_records():
    try:
        with open(FILE_NAME, "rb") as f:
            while True:
                chunk = f.read(RECORD_SIZE)
                if not chunk:
                    break

                record_id, name, value = struct.unpack(RECORD_FORMAT, chunk)

                name = name.decode("utf-8").rstrip("\x00")

                print(f"ID: {record_id}, Name: {name}, Value: {value}")

    except FileNotFoundError:
        print("Binary file not found yet.")


def append_record():
    record_id = int(input("Enter ID: "))
    name = input("Enter name: ")
    value = float(input("Enter value: "))

    name_bytes = name.encode("utf-8")
    name_bytes = name_bytes.ljust(20, b"\x00")

    with open(FILE_NAME, "ab") as f:
        f.write(struct.pack(RECORD_FORMAT, record_id, name_bytes, value))


if __name__ == "__main__":

    print("Existing Records:")
    read_records()

    print("\nAdd New Record")
    append_record()