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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.
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_BUFFER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_BUFFER_H_
#include "base/containers/span.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
#include "third_party/blink/renderer/platform/wtf/text/string_impl.h"
namespace WTF {
template <typename CharType>
class StringBuffer {
DISALLOW_NEW();
public:
StringBuffer() = default;
explicit StringBuffer(unsigned length) {
base::span<CharType> characters;
data_ = StringImpl::CreateUninitialized(length, characters);
}
StringBuffer(const StringBuffer&) = delete;
StringBuffer& operator=(const StringBuffer&) = delete;
~StringBuffer() = default;
void Shrink(unsigned new_length);
// Prefer Span() to length()/Characters().
base::span<CharType> Span() {
return base::span<CharType>(Characters(), length());
}
unsigned length() const { return data_ ? data_->length() : 0; }
CharType* Characters() {
return length() ? const_cast<CharType*>(data_->GetCharacters<CharType>())
: nullptr;
}
CharType& operator[](unsigned i) {
SECURITY_DCHECK(i < length());
return Characters()[i];
}
scoped_refptr<StringImpl> Release() { return std::move(data_); }
private:
scoped_refptr<StringImpl> data_;
};
template <typename CharType>
void StringBuffer<CharType>::Shrink(unsigned new_length) {
DCHECK(data_);
if (data_->length() == new_length)
return;
data_ = data_->Substring(0, new_length);
}
} // namespace WTF
using WTF::StringBuffer;
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_BUFFER_H_
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