/* * 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 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 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. */ #pragma once #include <wtf/Forward.h> #include <wtf/Markable.h> #include <wtf/text/StringHash.h> namespace WebCore { using SharedStringHash = uint32_t; // This is a hash value, but it can be used as a key in HashMap. So, we need to avoid producing deleted-value in HashMap, which is -1. struct SharedStringHashHash { static unsigned hash(SharedStringHash key) { return static_cast<unsigned>(key); } static bool equal(SharedStringHash a, SharedStringHash b) { return a == b; } static const bool safeToCompareToEmptyOrDeleted = true; static constexpr SharedStringHash deletedValue = std::numeric_limits<SharedStringHash>::max(); }; using SharedStringHashMarkableTraits = IntegralMarkableTraits<SharedStringHash, SharedStringHashHash::deletedValue>; // Returns the hash of the string that will be used for visited link coloring. WEBCORE_EXPORT SharedStringHash computeSharedStringHash(const String& url); WEBCORE_EXPORT SharedStringHash computeSharedStringHash(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. SharedStringHash computeVisitedLinkHash(const URL& base, const AtomString& attributeURL); } // namespace WebCore