1 files changed, 150 insertions, 0 deletions
diff --git a/Source/WebCore/Modules/indexeddb/shared/IDBResourceIdentifier.h b/Source/WebCore/Modules/indexeddb/shared/IDBResourceIdentifier.h
new file mode 100644
index 000000000..91d7810cc
--- /dev/null
+++ b/Source/WebCore/Modules/indexeddb/shared/IDBResourceIdentifier.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2015, 2016 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#pragma once
+
+#if ENABLE(INDEXED_DATABASE)
+
+#include <wtf/text/StringHash.h>
+
+namespace WebCore {
+
+class IDBRequest;
+
+namespace IDBClient {
+class IDBConnectionProxy;
+}
+
+namespace IDBServer {
+class IDBConnectionToClient;
+}
+
+class IDBResourceIdentifier {
+public:
+    explicit IDBResourceIdentifier(const IDBClient::IDBConnectionProxy&);
+    IDBResourceIdentifier(const IDBClient::IDBConnectionProxy&, const IDBRequest&);
+    explicit IDBResourceIdentifier(const IDBServer::IDBConnectionToClient&);
+
+    static IDBResourceIdentifier deletedValue();
+    WEBCORE_EXPORT bool isHashTableDeletedValue() const;
+
+    static IDBResourceIdentifier emptyValue();
+    bool isEmpty() const
+    {
+        return !m_resourceNumber && !m_idbConnectionIdentifier;
+    }
+
+    unsigned hash() const
+    {
+        uint64_t hashCodes[2] = { m_idbConnectionIdentifier, m_resourceNumber };
+        return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
+    }
+    
+    bool operator==(const IDBResourceIdentifier& other) const
+    {
+        return m_idbConnectionIdentifier == other.m_idbConnectionIdentifier
+            && m_resourceNumber == other.m_resourceNumber;
+    }
+    
+    uint64_t connectionIdentifier() const { return m_idbConnectionIdentifier; }
+
+    IDBResourceIdentifier isolatedCopy() const;
+
+#if !LOG_DISABLED
+    String loggingString() const;
+#endif
+
+    WEBCORE_EXPORT IDBResourceIdentifier();
+
+    template<class Encoder> void encode(Encoder&) const;
+    template<class Decoder> static bool decode(Decoder&, IDBResourceIdentifier&);
+
+private:
+    IDBResourceIdentifier(uint64_t connectionIdentifier, uint64_t resourceIdentifier);
+    uint64_t m_idbConnectionIdentifier { 0 };
+    uint64_t m_resourceNumber { 0 };
+};
+
+struct IDBResourceIdentifierHash {
+    static unsigned hash(const IDBResourceIdentifier& a) { return a.hash(); }
+    static bool equal(const IDBResourceIdentifier& a, const IDBResourceIdentifier& b) { return a == b; }
+    static const bool safeToCompareToEmptyOrDeleted = false;
+};
+
+struct IDBResourceIdentifierHashTraits : WTF::CustomHashTraits<IDBResourceIdentifier> {
+    static const bool hasIsEmptyValueFunction = true;
+    static const bool emptyValueIsZero = false;
+
+    static IDBResourceIdentifier emptyValue()
+    {
+        return IDBResourceIdentifier::emptyValue();
+    }
+
+    static bool isEmptyValue(const IDBResourceIdentifier& identifier)
+    {
+        return identifier.isEmpty();
+    }
+
+    static void constructDeletedValue(IDBResourceIdentifier& identifier)
+    {
+        identifier = IDBResourceIdentifier::deletedValue();
+    }
+
+    static bool isDeletedValue(const IDBResourceIdentifier& identifier)
+    {
+        return identifier.isHashTableDeletedValue();
+    }
+};
+
+template<class Encoder>
+void IDBResourceIdentifier::encode(Encoder& encoder) const
+{
+    encoder << m_idbConnectionIdentifier << m_resourceNumber;
+}
+
+template<class Decoder>
+bool IDBResourceIdentifier::decode(Decoder& decoder, IDBResourceIdentifier& identifier)
+{
+    if (!decoder.decode(identifier.m_idbConnectionIdentifier))
+        return false;
+
+    if (!decoder.decode(identifier.m_resourceNumber))
+        return false;
+
+    return true;
+}
+
+} // namespace WebCore
+
+namespace WTF {
+
+template<> struct HashTraits<WebCore::IDBResourceIdentifier> : WebCore::IDBResourceIdentifierHashTraits { };
+template<> struct DefaultHash<WebCore::IDBResourceIdentifier> {
+    typedef WebCore::IDBResourceIdentifierHash Hash;
+};
+
+} // namespace WTF
+
+#endif // ENABLE(INDEXED_DATABASE)