| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| #ifndef StringReference_h |
| #define StringReference_h |
| |
| #include <string.h> |
| #include <wtf/Forward.h> |
| #include <wtf/HashTraits.h> |
| |
| namespace IPC { |
| |
| class Encoder; |
| class Decoder; |
| |
| class StringReference { |
| public: |
| StringReference() |
| : m_data(0) |
| , m_size(0) |
| { |
| } |
| |
| StringReference(const char* data, size_t size) |
| : m_data(data) |
| , m_size(size) |
| { |
| } |
| |
| template<size_t length> |
| StringReference(const char (&string)[length]) |
| : m_data(string) |
| , m_size(length - 1) |
| { |
| } |
| |
| bool isEmpty() const { return !m_size; } |
| |
| size_t size() const { return m_size; } |
| const char* data() const { return m_data; } |
| |
| CString toString() const; |
| |
| void encode(Encoder&) const; |
| static bool decode(Decoder&, StringReference&); |
| |
| struct Hash { |
| static unsigned hash(const StringReference& a); |
| static bool equal(const StringReference&, const StringReference&); |
| static const bool safeToCompareToEmptyOrDeleted = true; |
| }; |
| |
| private: |
| const char* m_data; |
| size_t m_size; |
| }; |
| |
| inline bool operator==(const StringReference& a, const StringReference& b) |
| { |
| return a.size() == b.size() && !memcmp(a.data(), b.data(), a.size()); |
| } |
| |
| inline bool operator!=(const StringReference& a, const StringReference& b) |
| { |
| return !(a == b); |
| } |
| |
| inline bool StringReference::Hash::equal(const StringReference& a, const StringReference& b) |
| { |
| return a == b; |
| } |
| |
| } // namespace IPC |
| |
| namespace WTF { |
| template<typename T> struct DefaultHash; |
| |
| template<> struct DefaultHash<IPC::StringReference> { |
| typedef IPC::StringReference::Hash Hash; |
| }; |
| |
| template<> struct HashTraits<IPC::StringReference> : GenericHashTraits<IPC::StringReference> { |
| static const bool emptyValueIsZero = 0; |
| static void constructDeletedValue(IPC::StringReference& stringReference) { stringReference = IPC::StringReference(0, std::numeric_limits<size_t>::max()); } |
| static bool isDeletedValue(const IPC::StringReference& stringReference) { return stringReference.size() == std::numeric_limits<size_t>::max(); } |
| }; |
| |
| } // namespace WTF |
| |
| #endif // StringReference_h |