: Tells xTool to begin an encoding operation for pre-compression.
def reflate_stream(compressed_data, level=6, extract_only=False): """Reflate: decompress then recompress zlib stream""" decompressed = zlib.decompress(compressed_data) if extract_only: return decompressed # raw decompressed data recompressed = zlib.compress(decompressed, level) return recompressed xtool -mpng+reflate
def read_chunk(f): """Read PNG chunk: length, type, data, crc""" len_data = struct.unpack('>I', f.read(4))[0] chunk_type = f.read(4) data = f.read(len_data) crc = struct.unpack('>I', f.read(4))[0] return chunk_type, data, crc : Tells xTool to begin an encoding operation
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' crc""" len_data = struct.unpack('>
# Replace stream index 2 with new compressed data xtool mpng-reflate original.png patched.png --replace 2:new_stream.zlib
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