94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/*
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* Copyright (C) 2008, 2010 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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*
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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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* 3. Neither the name of Apple Inc. ("Apple") nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY 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 OF
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* 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 <limits>
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#include <unicode/utypes.h>
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#include <wtf/Assertions.h>
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#include <wtf/DebugHeap.h>
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#include <wtf/MallocPtr.h>
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#include <wtf/Noncopyable.h>
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namespace WTF {
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DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(StringBuffer);
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template <typename CharType>
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class StringBuffer {
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WTF_MAKE_NONCOPYABLE(StringBuffer);
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WTF_MAKE_FAST_ALLOCATED;
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public:
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explicit StringBuffer(unsigned length)
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: m_length(length)
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, m_data(m_length ? static_cast<CharType*>(StringBufferMalloc::malloc(Checked<size_t>(m_length) * sizeof(CharType))) : nullptr)
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{
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}
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~StringBuffer()
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{
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StringBufferMalloc::free(m_data);
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}
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void shrink(unsigned newLength)
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{
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ASSERT(newLength <= m_length);
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m_length = newLength;
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}
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void resize(unsigned newLength)
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{
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if (newLength > m_length) {
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if (newLength > std::numeric_limits<unsigned>::max() / sizeof(UChar))
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CRASH();
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m_data = static_cast<UChar*>(StringBufferMalloc::realloc(m_data, newLength * sizeof(UChar)));
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}
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m_length = newLength;
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}
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unsigned length() const { return m_length; }
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CharType* characters() { return m_data; }
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CharType& operator[](unsigned i) { ASSERT_WITH_SECURITY_IMPLICATION(i < m_length); return m_data[i]; }
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MallocPtr<CharType, StringBufferMalloc> release()
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{
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CharType* data = m_data;
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m_data = nullptr;
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return adoptMallocPtr<CharType, StringBufferMalloc>(data);
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}
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private:
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unsigned m_length;
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CharType* m_data;
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};
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} // namespace WTF
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using WTF::StringBuffer;
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