diff -r 000000000000 -r 4f2f89ce4247 WebCore/platform/LinkHash.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/platform/LinkHash.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2008 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:
+ * 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 COMPUTER, INC. ``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 COMPUTER, INC. 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. 
+ */
+
+#ifndef LinkHash_h
+#define LinkHash_h
+
+#include "StringHash.h"
+
+namespace WebCore {
+
+class AtomicString;
+class KURL;
+
+typedef uint64_t LinkHash;
+
+// Use the low 32-bits of the 64-bit LinkHash as the key for HashSets.
+struct LinkHashHash {
+    static unsigned hash(LinkHash key) { return static_cast<unsigned>(key); }
+    static bool equal(LinkHash a, LinkHash b) { return a == b; }
+    static const bool safeToCompareToEmptyOrDeleted = true;
+
+    // See AlreadyHashed::avoidDeletedValue.
+    static unsigned avoidDeletedValue(LinkHash hash64)
+    {
+        ASSERT(hash64);
+        unsigned hash = static_cast<unsigned>(hash64);
+        unsigned newHash = hash | (!(hash + 1) << 31);
+        ASSERT(newHash);
+        ASSERT(newHash != 0xFFFFFFFF);
+        return newHash;
+    }
+};
+
+// Returns the has of the string that will be used for visited link coloring.
+LinkHash visitedLinkHash(const UChar* url, unsigned length);
+
+// Resolves the potentially relative URL "attributeURL" relative to the given
+// base URL, and returns the hash of the string that will be used for visited
+// link coloring. It will return the special value of 0 if attributeURL does not
+// look like a relative URL.
+LinkHash visitedLinkHash(const KURL& base, const AtomicString& attributeURL);
+
+// Resolves the potentially relative URL "attributeURL" relative to the given
+// base URL, and returns the hash of the string that will be used for visited.
+// It will return an empty Vector in case of errors.
+void visitedURL(const KURL& base, const AtomicString& attributeURL, Vector<UChar, 512>&);
+
+
+}  // namespace WebCore
+
+#endif  // LinkHash_h