文件打包解包和文件的CRC32校验，将多个单一文件转化为单个二进制文件，并能恢复到原来的单个文件，并用crc32校验和验证文件的完整性-File packing and unpacking and the files CRC32 checksum, a plurality of single files into a single binary file, and can restore individual files to the original, and with crc32 check