对一篇英文文献中的字符频率进行统计进行霍夫曼编码生成码表，并对该片文章进行压缩-huffman encoder:collect the probility distribution of a english text file and using this probability as input and returns a huffman code table and compress this text file

使用哈夫曼编码的方法对文本进行压缩。可以是加密压缩，也可以是无密压缩(Huffman coding is used to compress the text. It can be encrypted compression or non dense compression)