device/bluetooth/bluetooth_utils.cc

   1 // Copyright (c) 2012 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 "device/bluetooth/bluetooth_utils.h"
   6
   7 #include <vector>
   8
   9 #include "base/basictypes.h"
  10 #include "base/logging.h"
  11 #include "base/strings/string_util.h"
  12
  13 namespace {
  14 static const char* kCommonUuidPostfix = "-0000-1000-8000-00805f9b34fb";
  15 static const char* kCommonUuidPrefix = "0000";
  16 static const int kUuidSize = 36;
  17 }  // namespace
  18
  19 namespace device {
  20 namespace bluetooth_utils {
  21
  22 std::string CanonicalUuid(std::string uuid) {
  23   if (uuid.empty())
  24     return std::string();
  25
  26   if (uuid.size() < 11 && uuid.find("0x") == 0)
  27     uuid = uuid.substr(2);
  28
  29   if (!(uuid.size() == 4 || uuid.size() == 8 || uuid.size() == 36))
  30     return std::string();
  31
  32   if (uuid.size() == 4 || uuid.size() == 8) {
  33     for (size_t i = 0; i < uuid.size(); ++i) {
  34       if (!IsHexDigit(uuid[i]))
  35         return std::string();
  36     }
  37
  38     if (uuid.size() == 4)
  39       return kCommonUuidPrefix + uuid + kCommonUuidPostfix;
  40
  41     return uuid + kCommonUuidPostfix;
  42   }
  43
  44   std::string uuid_result(uuid);
  45   for (int i = 0; i < kUuidSize; ++i) {
  46     if (i == 8 || i == 13 || i == 18 || i == 23) {
  47       if (uuid[i] != '-')
  48         return std::string();
  49     } else {
  50       if (!IsHexDigit(uuid[i]))
  51         return std::string();
  52       uuid_result[i] = tolower(uuid[i]);
  53     }
  54   }
  55   return uuid_result;
  56 }
  57
  58 }  // namespace bluetooth_utils
  59 }  // namespace device