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2025/cscg/misc/nokia/decode.py
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25
2025/cscg/misc/nokia/decode.py
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import numpy as np
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import matplotlib.pyplot as plt
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def decode_ota_bitmap(hex_data, width=72, height=14):
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# Step 1: Convert hex to binary string
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binary_data = ''.join(f"{int(h, 16):04b}" for h in hex_data)
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# Step 2: Ensure the binary data fits the expected size
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expected_bits = width * height
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binary_data = binary_data[:expected_bits]
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# Step 3: Convert binary data to a numpy array for visualization
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bitmap = np.array([int(bit) for bit in binary_data]).reshape(height, width)
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# Step 4: Display the bitmap
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plt.figure(figsize=(6, 2))
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plt.imshow(bitmap, cmap='gray', interpolation='nearest')
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plt.axis('off')
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plt.title("Decoded OTA Bitmap")
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plt.show()
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# Example Usage
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hex_payload = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFF9FFFFF3FFC71FFFFFFDFFFEFBFFDED0F3273DFFCC18FF8EDB7BDE1DFFB6FB7FB71B7BAEFDFFB6DB7FB7B8F12718FFCF30FF8E3BFFFFFFFFFFFFFFFFF1FFFFFFFFFFFFFFFFFFFFFFFFC0FFFFC0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00"
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decode_ota_bitmap(hex_payload)
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