Construct. destbufsize is the same as for D.zlib.uncompress().
A destructor is present on this object, but not explicitly documented in the source.
Decompress and return any remaining data. The returned data should be appended to that returned by uncompress(). The UnCompress object cannot be used further.
Decompress the data in buf and return the decompressed data. The buffers returned from successive calls to this should be concatenated together.
Used when the data to be decompressed is not all in one buffer.