數位家庭產品初探 -- djmount

djmount 寫法跟 ushare 差異非常大，感覺它想通吃 c/c++ 的用心，不過造成我覺得兩份源碼不太相容(或說風格大不同)。另外，看半天有點累，因此明天或許先驗證 upnp 怎麼說的，再來看 libupnp. 我相信這兩個都要花不少時間。

content_dir 跟 ushare 的 cds 看來很像，不過分成 public(本檔) 與 private/protected 部份
UpnpSetMaxContentLength (MAX_CONTENT_LENGTH);

didl_object 怪了，跟 ushare 來比，似乎簡單不少，不過感覺 ushare 寫的比較易讀

djfs file system implementation for djmount

<mount> -+- devices
               |
               |- <devname> -+- .status -> ../.debug/<devname>/status
               |             |
               |             +- xxx -+- xxx
               |             |       |- xxx
               |             |       `- _search/
               |             |
               |             +- .metadata/ -+- xxx
               |             |              `- xxx
               |             |
               |             `- _search/ -+- search_capabilities
               |                          |-  -+- ...
               |                          `- ...
               |
               |- <devname>
               |
               `- .debug/

               /*
                * Warning : the libupnp API (UpnpOpenHttpGetEx,
                * UpnpReadHttpGet ...) has strange prototypes for length
                * and ranges : "int" is not sufficient for large files !
                */

UpnpOpenHttpGetEx(), UpnpReadHttpGet(), UpnpCloseHttpGet()


djmount 比較有「物件」的概念，這會是較優的寫法呢，還是讓源碼不易閱讀呢？
比較有關的檔除了上面的 device_list 之外，還有 service, upnp_util，共三個


device_list 這個檔跟 upnp 相關性還比較大些

UpnpSearchAsync(), UpnpDownloadUrlItem(), UpnpGetErrorMessage(), UpnpInit(), UpnpFinish(), UpnpGetServerIpAddress(), UpnpGetServerPort(), UpnpUnRegisterClient(), UpnpRegisterClient() <-- 這是 Control Point 在 EventHandlerCallback () 會看到底下的 event type UPNP_DISCOVERY_ADVERTISEMENT_ALIVE, UPNP_DISCOVERY_SEARCH_RESULT, UPNP_DISCOVERY_SEARCH_TIMEOUT, UPNP_DISCOVERY_ADVERTISEMENT_BYEBYE, UPNP_CONTROL_ACTION_COMPLETE, UPNP_CONTROL_GET_VAR_COMPLETE. UPNP_EVENT_RECEIVED, UPNP_EVENT_SUBSCRIBE_COMPLETE, UPNP_EVENT_UNSUBSCRIBE_COMPLETE, UPNP_EVENT_RENEWAL_COMPLETE, UPNP_EVENT_AUTORENEWAL_FAILED, UPNP_EVENT_SUBSCRIPTION_EXPIRED, UPNP_EVENT_SUBSCRIPTION_REQUEST, UPNP_CONTROL_GET_VAR_REQUEST, UPNP_CONTROL_ACTION_REQUEST 後面三個會被忽略 upnp_util 裡則看到更多些

   UPNP_DISCOVERY_ADVERTISEMENT_ALIVE,
   UPNP_DISCOVERY_ADVERTISEMENT_BYEBYE,
   UPNP_DISCOVERY_SEARCH_RESULT,
   UPNP_DISCOVERY_SEARCH_TIMEOUT,
   /*
    * SOAP Stuff
    */
   UPNP_CONTROL_ACTION_REQUEST,
   UPNP_CONTROL_ACTION_COMPLETE,
   UPNP_CONTROL_GET_VAR_REQUEST,
   UPNP_CONTROL_GET_VAR_COMPLETE,
   /*
    * GENA Stuff
    */
   UPNP_EVENT_SUBSCRIPTION_REQUEST,
   UPNP_EVENT_RECEIVED,
   UPNP_EVENT_RENEWAL_COMPLETE,
   UPNP_EVENT_SUBSCRIBE_COMPLETE,
   UPNP_EVENT_UNSUBSCRIBE_COMPLETE,
   UPNP_EVENT_AUTORENEWAL_FAILED,
   UPNP_EVENT_SUBSCRIPTION_EXPIRED,