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//判断文件后缀是否符合要求
int judge_suffix(char * filename){
    char * filename_suf = NULL;
    filename_suf = strrchr(filename,'.');

    if((NULL == strstr(filename_suf,"jpg"))&&
       (NULL == strstr(filename_suf,"JPG"))&&
       (NULL == strstr(filename_suf,"png"))&&
       (NULL == strstr(filename_suf,"PNG"))&&
       (NULL == strstr(filename_suf,"jpeg"))&&
       (NULL == strstr(filename_suf,"JPEG"))&&
       (NULL == strstr(filename_suf,"bmp"))&&
       (NULL == strstr(filename_suf,"BMP"))
            )
    {
        return -1;
    }

}