remoting/base/capabilities.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/base/capabilities.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/strings/string_util.h"
  11
  12 namespace remoting {
  13
  14 bool HasCapability(const std::string& capabilities, const std::string& key) {
  15   std::vector<std::string> caps;
  16   Tokenize(capabilities, " ", &caps);
  17   return std::find(caps.begin(), caps.end(), key) != caps.end();
  18 }
  19
  20 std::string IntersectCapabilities(const std::string& client_capabilities,
  21                                   const std::string& host_capabilities) {
  22   std::vector<std::string> client_caps;
  23   Tokenize(client_capabilities, " ", &client_caps);
  24   std::sort(client_caps.begin(), client_caps.end());
  25
  26   std::vector<std::string> host_caps;
  27   Tokenize(host_capabilities, " ", &host_caps);
  28   std::sort(host_caps.begin(), host_caps.end());
  29
  30   std::vector<std::string> result(std::min(client_caps.size(),
  31                                            host_caps.size()));
  32   std::vector<std::string>::iterator end =
  33       std::set_intersection(client_caps.begin(),
  34                             client_caps.end(),
  35                             host_caps.begin(),
  36                             host_caps.end(),
  37                             result.begin());
  38   if (end != result.end())
  39     result.erase(end, result.end());
  40
  41   return JoinString(result, " ");
  42 }
  43
  44 }  // namespace remoting