说明：  jpeg解码器源代码 cjpeg.cpp 解码器类原程序 idct.cpp 解码器类原程序,idct解码函数 cjpeg.h 解码器类头文件 showjpeg.cpp 例子程序原文件 showjpeg.exe 使用本原代码的例子程序
(jpeg decoder source code types of the original decoder cjpeg.cpp procedures decoder category idct.cpp original procedure, idct decoding function of decoder cjpeg.h category header file example showjpeg.cpp procedures using the original document showjpeg.exe primitive example of the procedure code)