C++ NPT_String::IsEmpty方法代码示例

/*----------------------------------------------------------------------
|   NPT_UrlQuery::Parse
+---------------------------------------------------------------------*/
NPT_Result 
NPT_UrlQuery::Parse(const char* query)
{
    const char* cursor = query;
    NPT_String  name;
    NPT_String  value;
    bool        in_name = true;
    do {
        if (*cursor == '\0' || *cursor == '&') {
            if (!name.IsEmpty() && !value.IsEmpty()) {
                AddField(name, value, true);   
            }
            name.SetLength(0);
            value.SetLength(0);
            in_name = true;
        } else if (*cursor == '=' && in_name) {
            in_name = false;
        } else {
            if (in_name) {
                name += *cursor;
            } else {
                value += *cursor;
            }
        }
    } while (*cursor++);
    
    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   PLT_HttpHelper::ParseBody
+---------------------------------------------------------------------*/
NPT_Result
PLT_HttpHelper::ParseBody(const NPT_HttpMessage& message, 
                          NPT_XmlElementNode*&   tree) 
{
    // reset tree
    tree = NULL;

    // read body
    NPT_String body;
    NPT_CHECK_WARNING(GetBody(message, body));

    // parse body
    NPT_XmlParser parser;
    NPT_XmlNode*  node;
    NPT_Result result = parser.Parse(body, node);
    if (NPT_FAILED(result)) {
        NPT_LOG_FINEST_1("Failed to parse %s", body.IsEmpty()?"(empty string)":body.GetChars());
        NPT_CHECK_WARNING(result);
    }
    
    tree = node->AsElementNode();
    if (!tree) {
        delete node;
        return NPT_FAILURE;
    }

    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   CUPnPRenderer::ProcessHttpRequest
+---------------------------------------------------------------------*/
NPT_Result
CUPnPRenderer::ProcessHttpGetRequest(NPT_HttpRequest&              request,
                                  const NPT_HttpRequestContext& context,
                                  NPT_HttpResponse&             response)
{
    // get the address of who sent us some data back
    NPT_String  ip_address = context.GetRemoteAddress().GetIpAddress().ToString();
    NPT_String  method     = request.GetMethod();
    NPT_String  protocol   = request.GetProtocol();
    NPT_HttpUrl url        = request.GetUrl();

    if (url.GetPath() == "/thumb") {
        NPT_HttpUrlQuery query(url.GetQuery());
        NPT_String filepath = query.GetField("path");
        if (!filepath.IsEmpty()) {
            NPT_HttpEntity* entity = response.GetEntity();
            if (entity == NULL) return NPT_ERROR_INVALID_STATE;

            // check the method
            if (request.GetMethod() != NPT_HTTP_METHOD_GET &&
                request.GetMethod() != NPT_HTTP_METHOD_HEAD) {
                response.SetStatus(405, "Method Not Allowed");
                return NPT_SUCCESS;
            }

            // prevent hackers from accessing files outside of our root
            if ((filepath.Find("/..") >= 0) || (filepath.Find("\\..") >=0)) {
                return NPT_FAILURE;
            }
#if 1
            std::string path;
            //url
#else
            // open the file
            CStdString path = CURL::Decode((const char*) filepath);
#endif
            NPT_File file(path.c_str());
            NPT_Result result = file.Open(NPT_FILE_OPEN_MODE_READ);
            if (NPT_FAILED(result)) {
                response.SetStatus(404, "Not Found");
                return NPT_SUCCESS;
            }
            NPT_InputStreamReference stream;
            file.GetInputStream(stream);
            entity->SetContentType(GetMimeType(filepath));
            entity->SetInputStream(stream, true);

            return NPT_SUCCESS;
        }
    }

    return PLT_MediaRenderer::ProcessHttpGetRequest(request, context, response);
}

/*----------------------------------------------------------------------
|   PLT_PersonRoles::ToDidl
+---------------------------------------------------------------------*/
NPT_Result
PLT_PersonRoles::ToDidl(NPT_String& didl, const NPT_String& tag)
{
    NPT_String tmp;
    for (NPT_List<PLT_PersonRole>::Iterator it = 
         NPT_List<PLT_PersonRole>::GetFirstItem(); it; it++) {
        // if there's an empty artist, allow it only if there's nothing else
        if (it->name.IsEmpty() && m_ItemCount>1 && !tmp.IsEmpty()) continue;

        tmp += "<upnp:" + tag;
        if (!it->role.IsEmpty()) {
            tmp += " role=\"";
            PLT_Didl::AppendXmlEscape(tmp, it->role);
            tmp += "\"";
        }
        tmp += ">";
        PLT_Didl::AppendXmlEscape(tmp, it->name);
        tmp += "</upnp:" + tag + ">";
    }

    didl += tmp;
    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   PLT_MediaServer::OnSearch
+---------------------------------------------------------------------*/
NPT_Result
PLT_MediaServer::OnSearch(PLT_ActionReference&          action, 
                          const PLT_HttpRequestContext& context)
{
    NPT_COMPILER_UNUSED(context);

    NPT_Result res;
    NPT_String container_id;
    NPT_String search;
	NPT_String filter;
    NPT_String start;
    NPT_String count;
    NPT_String sort;
    NPT_List<NPT_String> sort_list;

    if (NPT_FAILED(action->GetArgumentValue("ContainerId", container_id)) ||
        NPT_FAILED(action->GetArgumentValue("SearchCriteria", search)) || 
		NPT_FAILED(action->GetArgumentValue("Filter",  filter)) ||
        NPT_FAILED(action->GetArgumentValue("StartingIndex",  start)) || 
        NPT_FAILED(action->GetArgumentValue("RequestedCount",  count)) || 
        NPT_FAILED(action->GetArgumentValue("SortCriteria",  sort))) {
        NPT_LOG_WARNING("Missing arguments");
        action->SetError(402, "Invalid args");
        return NPT_SUCCESS;
    }
    
    /* convert index and counts to int */
    NPT_UInt32 starting_index, requested_count;
    if (NPT_FAILED(start.ToInteger(starting_index)) ||
        NPT_FAILED(count.ToInteger(requested_count))) {       
        NPT_LOG_WARNING_2("Invalid arguments (%s, %s)", 
            start.GetChars(), count.GetChars());
        action->SetError(402, "Invalid args");
        return NPT_FAILURE;
    }
    
    /* parse sort criteria */
    if (NPT_FAILED(ParseSort(sort, sort_list))) {
        NPT_LOG_WARNING_1("Unsupported or invalid sort criteria error (%s)", 
            sort.GetChars());
        action->SetError(709, "Unsupported or invalid sort criteria error");
        return NPT_FAILURE;
    }
    
    NPT_LOG_INFO_5("Processing Search from %s with id=\"%s\", search=\"%s\", start=%d, count=%d", 
                   (const char*)context.GetRemoteAddress().GetIpAddress().ToString(),
                   (const char*)container_id,
                   (const char*)search,
                   starting_index,
                   requested_count);
                       
    if (search.IsEmpty() || search == "*") {
        res = OnBrowseDirectChildren(
            action, 
            container_id,
			filter,
            starting_index, 
            requested_count, 
            sort, 
            context);
    } else {
        res = OnSearchContainer(
            action, 
            container_id, 
            search, 
			filter,
            starting_index, 
            requested_count, 
            sort,
            context);
    }

    if (NPT_FAILED(res) && (action->GetErrorCode() == 0)) {
        action->SetError(800, "Internal error");
    }

    return res;
}