说明：  将任意一个指定的文本文件中的字符进行哈夫曼编码，生成一个编码文件（压缩文件）；反过来，可将一个压缩文件解码还原为一个文本文件。
(Would be arbitrary for a specified text file in characters Huffman encoding, to generate a code file (compressed file) in turn, can be a compressed file decoding back into a text file.)