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/*
* 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_LINK_HASH_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LINK_HASH_H_
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
namespace blink {
class KURL;
typedef uint64_t LinkHash;
// Use the low 32-bits of the 64-bit LinkHash as the key for HashSets.
struct LinkHashHash {
STATIC_ONLY(LinkHashHash);
static unsigned GetHash(LinkHash key) { return static_cast<unsigned>(key); }
static bool Equal(LinkHash a, LinkHash b) { return a == b; }
static const bool safe_to_compare_to_empty_or_deleted = true;
// See AlreadyHashed::avoidDeletedValue.
static unsigned AvoidDeletedValue(LinkHash hash64) {
DCHECK(hash64);
unsigned hash = static_cast<unsigned>(hash64);
unsigned new_hash = hash | (!(hash + 1) << 31);
DCHECK(new_hash);
DCHECK_NE(new_hash, 0xFFFFFFFF);
return new_hash;
}
};
// 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.
PLATFORM_EXPORT LinkHash VisitedLinkHash(const KURL& base,
const AtomicString& attribute_url);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_LINK_HASH_H_
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