说明：  源代码通过建立一个字符串表,用较短的代码来表示较长的字符串来实现压缩. 提取原始文本文件数据中的不同字符，基于这些字符创建一个编译表，然后用编译表中的字符的索引来替代原始文本文件数据中的相应字符，减少原始数据大小。我们这里的编译表不是事先创建好的，而是根据原始文件数据动态创建的，解码时可以从已编码的数据中还原出原来的编译表.
(The source code through the establishment of a string table, with a shorter code to represent a long string to achieve compression. Extract the original text file data in a different character, based on these characters to create a compiled table, and then compile the table of characters the index to replace the original text file data in the corresponding characters, reducing the size of the original data. We are here to create pre-compiled form is not good, but dynamically created based on original file data, and decoding the encoded data can be restored out of the original build sheet.)