Magcard — Write Read Utility Program Hot!

TRACK_MAX_LEN = 1: 79, 2: 40, 3: 107 class MagCard: def init (self): self.track1 = "" self.track2 = "" self.track3 = ""

if args.write or args.read: cli_mode(args) return magcard write read utility program

It simulates the low-level track data manipulation for magnetic stripe cards (tracks 1, 2, 3) as per ISO 7811, and includes functions to , write , encode , and decode card data. TRACK_MAX_LEN = 1: 79, 2: 40, 3: 107

For example, a USB keyboard wedge reader would just capture swiped data as if typed – no special driver needed. A writer would require sending track data in a proprietary command format over USB HID or serial. ID Tech readers)

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")

For real hardware (e.g., MagTek, ID Tech readers), you would replace the simulated I/O with serial/USB HID commands.

# 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")