一个简单的wed服务器SHTTPD（5）————服务器SHTTPD请求方法解析

//start from the very beginning,and to create greatness//@author: Chuangwei Lin//@E-mail：[e-mail]//@brief： 服务器SHTTPD请求方法解析#include "lcw_shttpd.h"/******************************************************函数名： Method_DoGet(struct worker_ctl *wctl)参数：功能：GET方法*******************************************************/static int Method_DoGet(struct worker_ctl *wctl){    DBGPRINT("LCW==>Method_DoGet\n");    struct conn_response *res = &wctl->conn.con_res;    struct conn_request *req = &wctl->conn.con_req;    char path[URI_MAX];    memset(path, 0, URI_MAX);    size_t    n;    unsigned long r1, r2;    char *fmt = "%a, %d %b %Y %H:%M:%S GMT";//时间格式    //需要确定的参数    size_t status = 200;//状态值,已确定    char *msg = "OK";    //状态信息,已确定    char date[64] = "";//时间    char lm[64] = "";    //请求文件最后修改信息    char etag[64] = "";//etag信息    big_int_t cl;        //内容长度    char range[64] = "";//范围        struct mine_type *mine = NULL;        time_t t = time(NULL);//取得当前时间    //根据fmt指向字符串的命令将localtime(&t)中的时间信息储存在date中    (void)strftime(date, sizeof(date),fmt,localtime(&t));    //最后修改时间    (void) strftime(lm, sizeof(lm), fmt,localtime(&res->fsate.st_mtime));    //ETAG 将可变个参数(...)按照"%lx.%lx"格式化成字符串，然后将其复制到etag中    (void) snprintf(etag, sizeof(etag), "%lx.%lx",(unsigned long)res->fsate.st_mtime,(unsigned long)res->fsate.st_size);        //发送的MIME类型    mine = Mine_Type(req->uri, strlen(req->uri), wctl);    //内容长度    cl = (big_int_t) res->fsate.st_size;    //范围range    memset(range, 0, sizeof(range));    n = -1;    if (req->ch.range.v_vec.len > 0 )//取出请求范围    {        printf("request range:%d\n",req->ch.range.v_vec.len);        //从ptr里读进数据，依照第二个参数的格式将数据写入到后面的参数里        n = sscanf(req->ch.range.v_vec.ptr,"bytes=%lu-%lu",&r1, &r2);    }    printf("n:%d\n",n);    if(n > 0)     {        status = 206;        lseek(res->fd, r1, SEEK_SET);        //n==2取前一个        cl = n == 2 ? r2 - r1 + 1: cl - r1;        (void) snprintf(range, sizeof(range),"Content-Range: bytes %lu-%lu/%lu\r\n",r1, r1 + cl - 1, (unsigned long) res->fsate.st_size);         msg = "Partial Content";    }    //构建输出的头部    memset(res->res.ptr, 0, sizeof(wctl->conn.dres));    snprintf(res->res.ptr,//缓冲区        sizeof(wctl->conn.dres),//缓冲区长度        "HTTP/1.1 %d %s\r\n" //状态和状态信息        "Date: %s\r\n"//日期        "Last-Modified: %s\r\n"//最后修改时间        "Etag: \"%s\"\r\n"//Web资源标记号        "Content-Type: %.*s\r\n"//内容类型        "Content-Length: %lu\r\n"//内容长度        //"Connection:close\r\n"        "Accept-Ranges: bytes\r\n"//发送范围                "%s\r\n",//范围起始        status,msg,date,lm,etag,strlen(mine->mime_type),mine->mime_type,cl,range);    res->cl = cl;    res->status = status;    printf("content length:%d, status:%d\n",res->cl, res->status);    DBGPRINT("LCW<==Method_DoGet\n");    return 0;}/******************************************************未实现的方法*******************************************************/static int Method_DoPost(struct worker_ctl *wctl){    return 0;}static int Method_DoHead(struct worker_ctl *wctl){    Method_DoGet(wctl);    close(wctl->conn.con_res.fd);    wctl->conn.con_res.fd = -1;    return 0;}static int Method_DoPut(struct worker_ctl *wctl){    return 0;}static int Method_DoDelete(struct worker_ctl *wctl){    return 0;}static int Method_DoCGI(struct worker_ctl *wctl){    return 0;    }static int Method_DoList(struct worker_ctl *wctl){    return 0;}/******************************************************函数名：Method_Do(struct worker_ctl *wctl)参数：业务和线程状态结构功能：匹配方法*******************************************************/void Method_Do(struct worker_ctl *wctl){    DBGPRINT("LCW==>Method_Do\n");    if(0)//????什么意思 不执行？        Method_DoCGI(wctl);    switch(wctl->conn.con_req.method)//匹配请求类型    {        case METHOD_PUT://PUT方法            Method_DoPut(wctl);            break;        case METHOD_DELETE://DELETE方法            Method_DoDelete(wctl);            break;        case METHOD_GET://GET方法(这里只实现GET方法)            Method_DoGet(wctl);            break;        case METHOD_POST://POST方法            Method_DoPost(wctl);            break;        case METHOD_HEAD://HEAD方法            Method_DoHead(wctl);            break;        default:            Method_DoList(wctl);    }    DBGPRINT("LCW<==Method_Do\n");}