Magcard Write Read Utility Program <2024>

def interactive_write(card): track = int(input("Enter track to write (1/2/3): ")) data = input(f"Enter data for track track (max TRACK_MAX_LEN[track] chars): ").strip() try: card.write_track(track, data) print(f"Track track written successfully.") except ValueError as e: print(f"Write failed: e")

# Verify checksum calc_lrc = 0 for ch in data_part: calc_lrc ^= ord(ch) if chr(calc_lrc % 128) != checksum: raise ValueError("Checksum mismatch – possible read error") return data_part def display_card(card): print("\n=== CURRENT CARD DATA ===") print(f"Track 1: card.track1 if card.track1 else '<empty>'") print(f"Track 2: card.track2 if card.track2 else '<empty>'") print(f"Track 3: card.track3 if card.track3 else '<empty>'") print("=========================\n") magcard write read utility program

python magcard_util.py --read 1 | Feature | Description | |--------|-------------| | ISO 7811 compliance | Enforces valid character sets and max lengths per track. | | Sentinel & LRC | Simulates magnetic stripe encoding with start/end sentinels and XOR checksum. | | Read/Write abstraction | Easy to replace MagCard class with real hardware driver (serial/HID). | | Error handling | Prevents invalid data from being written. | Extending to real hardware To use actual magnetic stripe readers/writers (e.g., MagTek, IDTECH, HID Omnikey), replace the MagCard class methods with device-specific commands – typically via serial or pyusb . | | Error handling | Prevents invalid data

def read_track(self, track_num): if track_num == 1: return self.track1 elif track_num == 2: return self.track2 elif track_num == 3: return self.track3 else: raise ValueError("Track must be 1, 2, or 3") ?") TRACK3_CHARSET = set("0123456789:

#!/usr/bin/env python3 """ Magnetic Card Read/Write Utility (Simulated / Educational) Supports ISO 7811 tracks 1, 2, 3. """ import re import argparse TRACK1_CHARSET = set("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 .-+/$%*") TRACK2_CHARSET = set("0123456789:;<=>?") TRACK3_CHARSET = set("0123456789:;<=>?")

def is_valid_track(self, track_num, data): if track_num == 1: return all(ch in TRACK1_CHARSET for ch in data) and len(data) <= TRACK_MAX_LEN[1] elif track_num == 2: return all(ch in TRACK2_CHARSET for ch in data) and len(data) <= TRACK_MAX_LEN[2] elif track_num == 3: return all(ch in TRACK3_CHARSET for ch in data) and len(data) <= TRACK_MAX_LEN[3] return False

def write_track(self, track_num, data): if not self.is_valid_track(track_num, data): raise ValueError(f"Invalid data for track track_num. Length or character mismatch.") if track_num == 1: self.track1 = data elif track_num == 2: self.track2 = data elif track_num == 3: self.track3 = data else: raise ValueError("Track must be 1, 2, or 3")