import qrdecode


# Image dimensions
width = 240
height = 240
buffer_size = width * height  # 240 * 240 = 57600 bytes
try:
    # Allocate buffer for grayscale image
    buffer = bytearray(buffer_size)
    # Read the raw grayscale image file
    with open('qrcode2.raw', 'rb') as f:
        bytes_read = f.readinto(buffer)
        if bytes_read != buffer_size:
            raise ValueError("File size does not match expected 240x240 grayscale image")
    # Decode QR code using qrdecode module
    print("decoding...")
    result = qrdecode.qrdecode(buffer, width, height)
    print(f"result: {result}")
    # Remove BOM (\ufeff) from the start of the decoded string, if present
    if result.startswith('\ufeff'):
        result = result[1:]
    print(f"result: {result}")
except OSError as e:
    print("Error reading file:", e)
    raise
except ValueError as e:
    print("Error:", e)
    raise