Xtool -mpng+reflate <REAL — 2025>

if chunk_type == CHUNK_TYPE_IEND: break def mpng_reflate_cli(args): input_png = args.input output_png = args.output or input_png.replace('.png', '_reflated.png') level = args.recompress_level or 6 extract_only = args.extract_only replace_data = args.replace

def rebuild_png_with_mpng(input_path, output_path, streams, recompress_level=6, replace_map=None): """Rebuild PNG with modified MPNG streams""" with open(input_path, 'rb') as fin, open(output_path, 'wb') as fout: fout.write(fin.read(8)) # PNG signature xtool -mpng+reflate

PNG_SIGNATURE = b'\x89PNG\r\n\x1a\n' CHUNK_TYPE_MPNG = b'mPNg' # Custom MPNG chunk CHUNK_TYPE_IDAT = b'IDAT' CHUNK_TYPE_IEND = b'IEND' 'rb') as fin

def extract_mpng_streams(png_path): """Extract all zlib-compressed streams from MPNG chunks""" streams = [] with open(png_path, 'rb') as f: # Verify PNG signature if f.read(8) != PNG_SIGNATURE: raise ValueError("Not a valid PNG file") xtool -mpng+reflate

replace_map = None if replace_data: # Format: "idx:file.zlib" or "idx:file.raw" idx_str, path_str = replace_data.split(':') idx = int(idx_str) data = Path(path_str).read_bytes() # If raw, compress it if path_str.endswith('.raw'): data = zlib.compress(data, level) replace_map = {idx: data}

def write_chunk(f, chunk_type, data): """Write PNG chunk with CRC""" f.write(struct.pack('>I', len(data))) f.write(chunk_type) f.write(data) crc = zlib.crc32(chunk_type + data) & 0xffffffff f.write(struct.pack('>I', crc))