---

import sys

def clean_lattice_bitstream(input_file, output_file):
    # Search for the exact 24-bit start of the internal header preamble: 0xFF 0xFF 0xBD
    # based on your exact hexdump row: "ffff bdff ffb3" -> bytes: FF FF BD FF FF B3
    TARGET_PREAMBLE = b'\xff\xff\xbd'
    
    with open(input_file, 'rb') as f:
        content = f.read()
        
    idx = content.find(TARGET_PREAMBLE)
    if idx == -1:
        print("Error: Could not find the core Preamble signature (FFFFBD) in this .bit file!")
        sys.exit(1)
            
    # Step 1: Slice the file, removing all text metadata headers before the preamble
    clean_payload = content[idx:]
    print(f"Text metadata header removed. Preamble found at offset {idx}.")
    print(f"Extracted {len(clean_payload)} bytes of clean hardware-ready payload.")
    
    # Step 2: Save the binary data AS IS (STRICTLY NO BIT MIRRORING)
    with open(output_file, 'wb') as f:
        f.write(clean_payload)
        
    print(f"Success! Output file saved to: {output_file}")

if __name__ == '__main__':
    if len(sys.argv) < 3:
        print("Usage: python3 lpc_convert.py <input.bit> <output.bin>")
        sys.exit(1)
    clean_lattice_bitstream(sys.argv[1], sys.argv[2])