Unify UUID/GUID generation code across base and blink

third_party/WebKit/Source/platform/UUID.cpp

-/*
-* Copyright (C) 2010 Google Inc. All rights reserved.
-*
-* Redistribution and use in source and binary forms, with or without
-* modification, are permitted provided that the following conditions are
-* met:
-*
-*     * Redistributions of source code must retain the above copyright
-* notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 #include "platform/UUID.h"
 
-#include "wtf/CryptographicallyRandomNumber.h"
-#include "wtf/HexNumber.h"
-#include "wtf/text/StringBuilder.h"
+#include "base/guid.h"
+#include "wtf/text/StringUTF8Adaptor.h"
 
 namespace blink {
 
 String createCanonicalUUIDString()
 {
-    unsigned randomData[4];
-    cryptographicallyRandomValues(reinterpret_cast<unsigned char*>(randomData), sizeof(randomData));
-
-    // Format as Version 4 UUID.
-    StringBuilder builder;
-    builder.reserveCapacity(36);
-    appendUnsignedAsHexFixedSize(randomData[0], builder, 8, Lowercase);
-    builder.append('-');
-    appendUnsignedAsHexFixedSize(randomData[1] >> 16, builder, 4, Lowercase);
-    builder.appendLiteral("-4");
-    appendUnsignedAsHexFixedSize(randomData[1] & 0x00000fff, builder, 3, Lowercase);
-    builder.append('-');
-    appendUnsignedAsHexFixedSize((randomData[2] >> 30) | 0x8, builder, 1, Lowercase);
-    appendUnsignedAsHexFixedSize((randomData[2] >> 16) & 0x00000fff, builder, 3, Lowercase);
-    builder.append('-');
-    appendUnsignedAsHexFixedSize(randomData[2] & 0x0000ffff, builder, 4, Lowercase);
-    appendUnsignedAsHexFixedSize(randomData[3], builder, 8, Lowercase);
-    return builder.toString();
-}
-
-static bool isLowercaseHex(char c)
-{
-    return (('0' <= c && c <= '9') || ('a' <= c && c <= 'f'));
+    std::string uuid = base::GenerateGUID();
+    return String::fromUTF8(uuid.data(), uuid.length());
 }
 
 bool isValidUUID(const String& uuid)
 {
-    // 32 digits + 4 hyphens = 36 characters.
-    if (uuid.length() != 36)
-        return false;
-
-    for (size_t i = 0; i < uuid.length(); i++) {
-        if (i == 8 || i == 13 || i == 18 || i == 23) {
-            if (uuid[i] != '-')
-                return false;
-        } else {
-            if (!isLowercaseHex(uuid[i]))
-                return false;
-        }
-    }
-
-    return true;
+    // In most (if not all) cases the given uuid should be utf-8, so this
+    // conversion should be almost no-op.
+    StringUTF8Adaptor utf8(uuid);
+    return base::IsValidGUIDOutputString(utf8.asStringPiece());

[esprehn, 2016/04/27 09:00:59]

Can this take a StringPiece so we can avoid the copy?

[kinuko, 2016/04/27 09:21:19]

It does now =)

 }
 
 } // namespace blink