Parse short UUIDs, and add validation.

BUG=134546
TEST=updated unit test


Review URL: https://chromiumcodereview.appspot.com/10698013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144837 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/chrome/browser/chromeos/bluetooth/bluetooth_utils.cc b/chrome/browser/chromeos/bluetooth/bluetooth_utils.cc
index 608845f..02643c6 100644
--- a/chrome/browser/chromeos/bluetooth/bluetooth_utils.cc
+++ b/chrome/browser/chromeos/bluetooth/bluetooth_utils.cc
@@ -10,6 +10,13 @@
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
+#include "base/string_util.h"
+
+namespace {
+static const char* kCommonUuidPostfix = "-0000-1000-8000-00805f9b34fb";
+static const char* kCommonUuidPrefix = "0000";
+static const int kUuidSize = 36;
+}  // namespace
 
 namespace chromeos {
 namespace bluetooth_utils {
@@ -41,5 +48,41 @@ bool str2ba(const std::string& in_address, bdaddr_t* out_address) {
   return false;
 }
 
+std::string CanonicalUuid(std::string uuid) {
+  if (uuid.empty())
+    return "";
+
+  if (uuid.size() < 11 && uuid.find("0x") == 0)
+    uuid = uuid.substr(2);
+
+  if (!(uuid.size() == 4 || uuid.size() == 8 || uuid.size() == 36))
+    return "";
+
+  if (uuid.size() == 4 || uuid.size() == 8) {
+    for (size_t i = 0; i < uuid.size(); ++i) {
+      if (!IsHexDigit(uuid[i]))
+        return "";
+    }
+
+    if (uuid.size() == 4)
+      return kCommonUuidPrefix + uuid + kCommonUuidPostfix;
+
+    return uuid + kCommonUuidPostfix;
+  }
+
+  std::string uuid_result(uuid);
+  for (int i = 0; i < kUuidSize; ++i) {
+    if (i == 8 || i == 13 || i == 18 || i == 23) {
+      if (uuid[i] != '-')
+        return "";
+    } else {
+      if (!IsHexDigit(uuid[i]))
+        return "";
+      uuid_result[i] = tolower(uuid[i]);
+    }
+  }
+  return uuid_result;
+}
+
 }  // namespace bluetooth_utils
 }  // namespace chromeos