C++ NPT_String::Left方法代码示例

/*----------------------------------------------------------------------
|   PLT_FileMediaServer::ServeFile
+---------------------------------------------------------------------*/
NPT_Result 
PLT_FileMediaServer::ServeFile(NPT_HttpRequest&              request, 
                               const NPT_HttpRequestContext& context,
                               NPT_HttpResponse&             response,
                               const NPT_String&             uri_path,
                               const NPT_String&             file_path)
{
    NPT_COMPILER_UNUSED(context);

    // prevent hackers from accessing files outside of our root
    if ((file_path.Find("/..") >= 0) || (file_path.Find("\\..") >= 0)) {
        return NPT_FAILURE;
    }

    // File requested
    NPT_String path = m_FileBaseUri.GetPath();
    if (path.Compare(uri_path.Left(path.GetLength()), true) == 0) {
        NPT_Position start, end;
        PLT_HttpHelper::GetRange(request, start, end);
        
        return PLT_FileServer::ServeFile(response,
                                         NPT_FilePath::Create(m_Path, file_path), 
                                         start, 
                                         end, 
                                         !request.GetMethod().Compare("HEAD"));
    } 

    // Album Art requested
    path = m_AlbumArtBaseUri.GetPath();
    if (path.Compare(uri_path.Left(path.GetLength()), true) == 0) {
        return OnAlbumArtRequest(response, m_Path + file_path);
    } 
    
    return NPT_FAILURE;
}

/*----------------------------------------------------------------------
|   PLT_FileMediaServer::ProcessFileRequest
+---------------------------------------------------------------------*/
NPT_Result 
PLT_FileMediaServer::ProcessFileRequest(NPT_HttpRequest&  request, 
                                        NPT_HttpResponse& response, 
                                        NPT_SocketInfo&   client_info)
{
    NPT_COMPILER_UNUSED(client_info);

    NPT_LOG_FINE("PLT_FileMediaServer::ProcessFileRequest Received Request:");
    PLT_LOG_HTTP_MESSAGE(NPT_LOG_LEVEL_FINE, &request);

    response.GetHeaders().SetHeader("Accept-Ranges", "bytes");

    if (request.GetMethod().Compare("GET") && request.GetMethod().Compare("HEAD")) {
        response.SetStatus(500, "Internal Server Error");
        return NPT_SUCCESS;
    }

    // File requested
    NPT_String path = m_FileBaseUri.GetPath();
    NPT_String strUri = NPT_Uri::PercentDecode(request.GetUrl().GetPath());

    NPT_HttpUrlQuery query(request.GetUrl().GetQuery());
    NPT_String file_path = query.GetField("path");

    // hack for XBMC support for 360, we urlencoded the ? to that the 360 doesn't strip out the query
    // but then the query ends being parsed as part of the path
    int index = strUri.Find("path=");
    if (index>0) file_path = strUri.Right(strUri.GetLength()-index-5);
    if (file_path.GetLength() == 0) goto failure;

    // HACK for wmp: somehow they inverse our slashes !
    // do it only if we're on windows
    if (m_DirDelimiter == "\\") {
        file_path.Replace('/', '\\');
    }

    if (path.Compare(strUri.Left(path.GetLength()), true) == 0) {
        NPT_Integer start, end;
        PLT_HttpHelper::GetRange(&request, start, end);

        return PLT_FileServer::ServeFile(m_Path + file_path, &response, start, end, !request.GetMethod().Compare("HEAD"));
    } 

    // Album Art requested
    path = m_AlbumArtBaseUri.GetPath();
    if (path.Compare(strUri.Left(path.GetLength()), true) == 0) {
        return OnAlbumArtRequest(m_Path + file_path, response);
    } 

failure:
    response.SetStatus(404, "File Not Found");
    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   CUPnPDirectory::GetFriendlyName
+---------------------------------------------------------------------*/
const char*
CUPnPDirectory::GetFriendlyName(const char* url)
{
    NPT_String path = url;
    if (!path.EndsWith("/")) path += "/";

    if (path.Left(7).Compare("upnp://", true) != 0) {
        return NULL;
    } else if (path.Compare("upnp://", true) == 0) {
        return "UPnP Media Servers (Auto-Discover)";
    }

    // look for nextslash
    int next_slash = path.Find('/', 7);
    if (next_slash == -1)
        return NULL;

    NPT_String uuid = path.SubString(7, next_slash-7);
    NPT_String object_id = path.SubString(next_slash+1, path.GetLength()-next_slash-2);

    // look for device
    PLT_DeviceDataReference device;
    if(!FindDeviceWait(CUPnP::GetInstance(), uuid, device))
        return NULL;

    return (const char*)device->GetFriendlyName();
}

/*----------------------------------------------------------------------
|   CUPnPDirectory::GetFriendlyName
+---------------------------------------------------------------------*/
const char*
CUPnPDirectory::GetFriendlyName(const char* url)
{
    NPT_String path = url;
    if (!path.EndsWith("/")) path += "/";

    if (path.Left(7).Compare("upnp://", true) != 0) {
        return NULL;
    } else if (path.Compare("upnp://", true) == 0) {
        return "UPnP Media Servers (Auto-Discover)";
    }

    // look for nextslash
    int next_slash = path.Find('/', 7);
    if (next_slash == -1)
        return NULL;

    NPT_String uuid = path.SubString(7, next_slash-7);
    NPT_String object_id = path.SubString(next_slash+1, path.GetLength()-next_slash-2);

    // look for device
    PLT_DeviceDataReference* device;
    const NPT_Lock<PLT_DeviceMap>& devices = CUPnP::GetInstance()->m_MediaBrowser->GetMediaServers();
    if (NPT_FAILED(devices.Get(uuid, device)) || device == NULL)
        return NULL;

    return (const char*)(*device)->GetFriendlyName();
}

void 
GPAC_MediaController::OnMSStateVariablesChanged(PLT_Service* service, NPT_List<PLT_StateVariable*>* vars)
{
	GPAC_MediaServerItem *ms = NULL;
	gf_mx_p(m_ControlPointLock);

	u32 i, count;
	count = gf_list_count(m_MediaServers);
	for (i=0; i<count; i++) {
		GPAC_MediaServerItem *ms = (GPAC_MediaServerItem *) gf_list_get(m_MediaServers, i);
		if (ms->m_UUID==service->GetDevice()->GetUUID()) {
			break;
		}
		ms = NULL;
	}
	
	if (!ms) {
		gf_mx_v(m_ControlPointLock);
		return;
	}

    PLT_StateVariable* var = PLT_StateVariable::Find(*vars, "ContainerUpdateIDs");
    if (var) {
        // variable found, parse value
        NPT_String value = var->GetValue();
        NPT_String item_id, update_id;
        int index;

        while (value.GetLength()) {
            // look for container id
            index = value.Find(',');
            if (index < 0) break;
            item_id = value.Left(index);
            value = value.SubString(index+1);

            // look for update id
            if (value.GetLength()) {
                index = value.Find(',');
                update_id = (index<0)?value:value.Left(index);
                value = (index<0)?"":value.SubString(index+1);

				m_pUPnP->ContainerChanged(ms->m_device, item_id, update_id);
            }       
        }
    }        
	gf_mx_v(m_ControlPointLock);
}

/*----------------------------------------------------------------------
|   PLT_SyncMediaBrowser::OnMSStateVariablesChanged
+---------------------------------------------------------------------*/
void 
PLT_SyncMediaBrowser::OnMSStateVariablesChanged(PLT_Service*                  service, 
                                                NPT_List<PLT_StateVariable*>* vars)
{
    NPT_AutoLock lock(m_MediaServers);
    
    PLT_DeviceDataReference device;
    const NPT_List<PLT_DeviceMapEntry*>::Iterator it = 
        m_MediaServers.GetEntries().Find(PLT_DeviceMapFinderByUUID(service->GetDevice()->GetUUID()));
    if (!it) return; // device with this service has gone away

    device = (*it)->GetValue();
    PLT_StateVariable* var = PLT_StateVariable::Find(*vars, "ContainerUpdateIDs");
    if (var) {
        // variable found, parse value
        NPT_String value = var->GetValue();
        NPT_String item_id, update_id;
        int index;

        while (value.GetLength()) {
            // look for container id
            index = value.Find(',');
            if (index < 0) break;
            item_id = value.Left(index);
            value = value.SubString(index+1);

            // look for update id
            if (value.GetLength()) {
                index = value.Find(',');
                update_id = (index<0)?value:value.Left(index);
                value = (index<0)?"":value.SubString(index+1);

                // clear cache for that device
                if (m_UseCache) m_Cache.Clear(device->GetUUID(), item_id);

                // notify listener
                if (m_ContainerListener) m_ContainerListener->OnContainerChanged(device, item_id, update_id);
            }       
        }
    }        
}

/*----------------------------------------------------------------------
|   PLT_Didl::ParseTimeStamp
+---------------------------------------------------------------------*/
NPT_Result
PLT_Didl::ParseTimeStamp(const NPT_String& timestamp, NPT_UInt32& seconds)
{
    // assume a timestamp in the format HH:MM:SS.FFF
    int separator;
    NPT_String str = timestamp;
    NPT_UInt32 value;

    // reset output params first
    seconds = 0;
    
    // remove milliseconds first if any
    if ((separator = str.ReverseFind('.')) != -1) {
        str = str.Left(separator);
    }

    // look for next separator
    if ((separator = str.ReverseFind(':')) == -1) return NPT_FAILURE;
    
    // extract seconds
    NPT_CHECK_WARNING(str.SubString(separator+1).ToInteger(value));
    seconds = value;
    str = str.Left(separator);

    // look for next separator
    if ((separator = str.ReverseFind(':')) == -1) return NPT_FAILURE;
    
    // extract minutes
    NPT_CHECK_WARNING(str.SubString(separator+1).ToInteger(value));
    seconds += 60*value;
    str = str.Left(separator);
    
    // extract hours
    NPT_CHECK_WARNING(str.ToInteger(value));
    seconds += 3600*value;
    
    return NPT_SUCCESS;
}