Fix BLFReader error for incomplete or truncated stream (#1662)

* bugfix BLFreader

zlib.error: Error -5 while decompressing data: incomplete or truncated stream in Python

* delete elif

copied on to many lines

* Update blf.py

shorten line -> comment in next line
delete unused variable

* fromatting

---------

Co-authored-by: Iding Robin <[email protected]>

Author: ro-id

can/io/blf.py

@@ -182,12 +182,13 @@ def __iter__(self) -> Generator[Message, None, None]:
             self.file.read(obj_size % 4)
 
             if obj_type == LOG_CONTAINER:
-                method, uncompressed_size = LOG_CONTAINER_STRUCT.unpack_from(obj_data)
+                method, _ = LOG_CONTAINER_STRUCT.unpack_from(obj_data)
                 container_data = obj_data[LOG_CONTAINER_STRUCT.size :]
                 if method == NO_COMPRESSION:
                     data = container_data
                 elif method == ZLIB_DEFLATE:
-                    data = zlib.decompress(container_data, 15, uncompressed_size)
+                    zobj = zlib.decompressobj()
+                    data = zobj.decompress(container_data)
                 else:
                     # Unknown compression method
                     LOG.warning("Unknown compression method (%d)", method)