Add UUID::InitializeFromString().

util/misc/uuid.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/misc/uuid.h"
 
+#include <inttypes.h>
+#include <stdio.h>
 #include <string.h>
 
 #include "base/basictypes.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_byteorder.h"
 #include "util/stdlib/cxx.h"
 
 #if CXX_LIBRARY_VERSION >= 2011
 #include <type_traits>
 #endif
@@ skipping 18 matching lines @@
   return memcmp(this, &that, sizeof(UUID)) == 0;
 }
 
 void UUID::InitializeFromBytes(const uint8_t* bytes) {
   memcpy(this, bytes, sizeof(*this));
   data_1 = base::NetToHost32(data_1);
   data_2 = base::NetToHost16(data_2);
   data_3 = base::NetToHost16(data_3);
 }
 
+bool UUID::InitializeFromString(const base::StringPiece& string) {
+  if (string.length() != 36)
+    return false;
+
+  UUID temp;
+  const char kScanFormat[] =
+      "%08" SCNx32 "-%04" SCNx16 "-%04" SCNx16
+      "-%02" SCNx8 "%02" SCNx8
+      "-%02" SCNx8 "%02" SCNx8 "%02" SCNx8 "%02" SCNx8 "%02" SCNx8 "%02" SCNx8;
+  int rv = sscanf(string.data(),
+                  kScanFormat,
+                  &temp.data_1,
+                  &temp.data_2,
+                  &temp.data_3,
+                  &temp.data_4[0],
+                  &temp.data_4[1],
+                  &temp.data_5[0],
+                  &temp.data_5[1],
+                  &temp.data_5[2],
+                  &temp.data_5[3],
+                  &temp.data_5[4],
+                  &temp.data_5[5]);
+  if (rv != 11)
+    return false;
+
+  *this = temp;
+  return true;
+}
+
 std::string UUID::ToString() const {
   return base::StringPrintf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
                             data_1,
                             data_2,
                             data_3,
                             data_4[0],
                             data_4[1],
                             data_5[0],
                             data_5[1],
                             data_5[2],
                             data_5[3],
                             data_5[4],
                             data_5[5]);
 }
 
 }  // namespace crashpad