CompressionError if called more than once, the output sink is
not set, or the compressed input appears truncated.
LzmaDecompressor.finish
void finish()Finalize the stream.
Drains any remaining buffered decompressed output by calling lzma_code with LZMA_FINISH until liblzma reports LZMA_STREAM_END. If end-of-stream is never reached the input is reported as truncated.