Huffman压缩的全部代码实现，包括Huffman树的构建代码和Huffman编码的实现和获取，以及压缩和解压缩的文件读写，包括界面的实现，完整的实现了Huffman压缩-Huffman compression to achieve all the code, including the building code Huffman tree and Huffman coding implementation and acquisition, as well as compression and decompression of files to read and write, including the realization of the interface, the full realization of the Huffman compression