136 lines
4.9 KiB
C++
136 lines
4.9 KiB
C++
/*
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* Copyright (C) 2003-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/HashFunctions.h>
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#include <wtf/HashTraits.h>
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#include <wtf/Ref.h>
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#include <wtf/RefCounted.h>
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#include <wtf/Span.h>
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namespace WTF {
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DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CStringBuffer);
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// CStringBuffer is the ref-counted storage class for the characters in a CString.
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// The data is implicitly allocated 1 character longer than length(), as it is zero-terminated.
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class CStringBuffer final : public RefCounted<CStringBuffer> {
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WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(CStringBuffer);
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public:
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const char* data() { return mutableData(); }
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size_t length() const { return m_length; }
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private:
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friend class CString;
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static Ref<CStringBuffer> createUninitialized(size_t length);
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CStringBuffer(size_t length) : m_length(length) { }
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char* mutableData() { return reinterpret_cast_ptr<char*>(this + 1); }
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const size_t m_length;
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};
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// A container for a null-terminated char array supporting copy-on-write
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// assignment. The contained char array may be null.
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class CString final {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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CString() { }
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WTF_EXPORT_PRIVATE CString(const char*);
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WTF_EXPORT_PRIVATE CString(const char*, size_t length);
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CString(const uint8_t* data, size_t length) : CString(reinterpret_cast<const char*>(data), length) { }
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CString(CStringBuffer* buffer) : m_buffer(buffer) { }
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WTF_EXPORT_PRIVATE static CString newUninitialized(size_t length, char*& characterBuffer);
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CString(HashTableDeletedValueType) : m_buffer(HashTableDeletedValue) { }
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const char* data() const
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{
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return m_buffer ? m_buffer->data() : nullptr;
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}
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const uint8_t* dataAsUInt8Ptr() const { return reinterpret_cast<const uint8_t*>(data()); }
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Span<const uint8_t> bytes() const
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{
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if (m_buffer)
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return { reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->length() };
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return { };
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}
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Span<const uint8_t> bytesInludingNullTerminator() const
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{
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if (m_buffer)
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return { reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->length() + 1 };
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return { };
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}
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WTF_EXPORT_PRIVATE char* mutableData();
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size_t length() const
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{
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return m_buffer ? m_buffer->length() : 0;
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}
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bool isNull() const { return !m_buffer; }
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bool isSafeToSendToAnotherThread() const;
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CStringBuffer* buffer() const { return m_buffer.get(); }
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bool isHashTableDeletedValue() const { return m_buffer.isHashTableDeletedValue(); }
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WTF_EXPORT_PRIVATE unsigned hash() const;
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// Useful if you want your CString to hold dynamic data.
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WTF_EXPORT_PRIVATE void grow(size_t newLength);
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private:
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void copyBufferIfNeeded();
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void init(const char*, size_t length);
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RefPtr<CStringBuffer> m_buffer;
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};
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WTF_EXPORT_PRIVATE bool operator==(const CString& a, const CString& b);
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inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }
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WTF_EXPORT_PRIVATE bool operator==(const CString& a, const char* b);
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inline bool operator!=(const CString& a, const char* b) { return !(a == b); }
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WTF_EXPORT_PRIVATE bool operator<(const CString& a, const CString& b);
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struct CStringHash {
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static unsigned hash(const CString& string) { return string.hash(); }
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WTF_EXPORT_PRIVATE static bool equal(const CString& a, const CString& b);
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static constexpr bool safeToCompareToEmptyOrDeleted = true;
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};
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template<typename T> struct DefaultHash;
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template<> struct DefaultHash<CString> : CStringHash { };
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template<typename T> struct HashTraits;
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template<> struct HashTraits<CString> : SimpleClassHashTraits<CString> { };
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} // namespace WTF
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using WTF::CString;
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