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/*
* Copyright (C) 2008, 2010 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 StringBuffer_h
#define StringBuffer_h
#include "wtf/Assertions.h"
#include "wtf/text/StringImpl.h"
#include "wtf/unicode/Unicode.h"
namespace WTF {
template <typename CharType>
class StringBuffer {
WTF_MAKE_NONCOPYABLE(StringBuffer);
public:
StringBuffer() { }
explicit StringBuffer(unsigned length)
{
CharType* characters;
m_data = StringImpl::createUninitialized(length, characters);
}
~StringBuffer()
{
}
void shrink(unsigned newLength)
{
if (m_data->length() == newLength)
return;
m_data->truncateAssumingIsolated(newLength);
}
void resize(unsigned newLength)
{
if (!m_data) {
CharType* characters;
m_data = StringImpl::createUninitialized(newLength, characters);
return;
}
if (newLength > m_data->length()) {
CharType* characters;
m_data = StringImpl::reallocate(m_data.release(), newLength, characters);
return;
}
shrink(newLength);
}
unsigned length() const { return m_data ? m_data->length() : 0; }
CharType* characters() { return length() ? const_cast<CharType*>(m_data->getCharacters<CharType>()) : 0; }
CharType& operator[](unsigned i) { ASSERT_WITH_SECURITY_IMPLICATION(i < length()); return characters()[i]; }
PassRefPtr<StringImpl> release() { return m_data.release(); }
private:
RefPtr<StringImpl> m_data;
};
} // namespace WTF
using WTF::StringBuffer;
#endif // StringBuffer_h
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