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110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
/*
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* Copyright (C) 2012 Google 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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_WTF_STREAMBUFFER_H_
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#define SKY_ENGINE_WTF_STREAMBUFFER_H_
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#include "flutter/sky/engine/wtf/Deque.h"
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#include "flutter/sky/engine/wtf/PassOwnPtr.h"
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namespace WTF {
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template <typename T, size_t BlockSize>
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class StreamBuffer {
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private:
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typedef Vector<T> Block;
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public:
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StreamBuffer() : m_size(0), m_readOffset(0) {}
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~StreamBuffer() {}
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bool isEmpty() const { return !size(); }
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void append(const T* data, size_t size) {
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if (!size)
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return;
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m_size += size;
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while (size) {
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if (!m_buffer.size() || m_buffer.last()->size() == BlockSize)
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m_buffer.append(adoptPtr(new Block));
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size_t appendSize = std::min(BlockSize - m_buffer.last()->size(), size);
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m_buffer.last()->append(data, appendSize);
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data += appendSize;
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size -= appendSize;
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}
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}
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// This function consume data in the fist block.
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// Specified size must be less than over equal to firstBlockSize().
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void consume(size_t size) {
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ASSERT(m_size >= size);
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if (!m_size)
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return;
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ASSERT(m_buffer.size() > 0);
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ASSERT(m_readOffset + size <= m_buffer.first()->size());
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m_readOffset += size;
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m_size -= size;
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if (m_readOffset >= m_buffer.first()->size()) {
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m_readOffset = 0;
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m_buffer.removeFirst();
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}
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}
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size_t size() const { return m_size; }
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const T* firstBlockData() const {
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if (!m_size)
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return 0;
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ASSERT(m_buffer.size() > 0);
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return &m_buffer.first()->data()[m_readOffset];
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}
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size_t firstBlockSize() const {
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if (!m_size)
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return 0;
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ASSERT(m_buffer.size() > 0);
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return m_buffer.first()->size() - m_readOffset;
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}
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private:
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size_t m_size;
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size_t m_readOffset;
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Deque<OwnPtr<Block>> m_buffer;
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};
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} // namespace WTF
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using WTF::StreamBuffer;
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#endif // SKY_ENGINE_WTF_STREAMBUFFER_H_
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