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/*
* Copyright (C) 2015 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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 ThreadSafeDataBuffer_h
#define ThreadSafeDataBuffer_h
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/Vector.h>
namespace WebCore {
class ThreadSafeDataBuffer;
class ThreadSafeDataBufferImpl : public ThreadSafeRefCounted<ThreadSafeDataBufferImpl> {
friend class ThreadSafeDataBuffer;
private:
enum AdoptVectorTag { AdoptVector };
ThreadSafeDataBufferImpl(Vector<uint8_t>& data, AdoptVectorTag)
{
m_data.swap(data);
}
ThreadSafeDataBufferImpl(const Vector<uint8_t>& data)
: m_data(data)
{
}
ThreadSafeDataBufferImpl(const void* data, unsigned length)
: m_data(length)
{
memcpy(m_data.data(), data, length);
}
Vector<uint8_t> m_data;
};
class ThreadSafeDataBuffer {
public:
static ThreadSafeDataBuffer adoptVector(Vector<uint8_t>& data)
{
return ThreadSafeDataBuffer(data, ThreadSafeDataBufferImpl::AdoptVector);
}
static ThreadSafeDataBuffer copyVector(const Vector<uint8_t>& data)
{
return ThreadSafeDataBuffer(data);
}
static ThreadSafeDataBuffer copyData(const void* data, unsigned length)
{
return ThreadSafeDataBuffer(data, length);
}
ThreadSafeDataBuffer()
{
}
const Vector<uint8_t>* data() const
{
return m_impl ? &m_impl->m_data : nullptr;
}
size_t size() const
{
return m_impl ? m_impl->m_data.size() : 0;
}
bool operator==(const ThreadSafeDataBuffer& other) const
{
if (!m_impl)
return !other.m_impl;
return m_impl->m_data == other.m_impl->m_data;
}
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static bool decode(Decoder&, ThreadSafeDataBuffer&);
private:
explicit ThreadSafeDataBuffer(Vector<uint8_t>& data, ThreadSafeDataBufferImpl::AdoptVectorTag tag)
{
m_impl = adoptRef(new ThreadSafeDataBufferImpl(data, tag));
}
explicit ThreadSafeDataBuffer(const Vector<uint8_t>& data)
{
m_impl = adoptRef(new ThreadSafeDataBufferImpl(data));
}
explicit ThreadSafeDataBuffer(const void* data, unsigned length)
{
m_impl = adoptRef(new ThreadSafeDataBufferImpl(data, length));
}
RefPtr<ThreadSafeDataBufferImpl> m_impl;
};
template<class Encoder>
void ThreadSafeDataBuffer::encode(Encoder& encoder) const
{
bool hasData = m_impl;
encoder << hasData;
if (hasData)
encoder << m_impl->m_data;
}
template<class Decoder>
bool ThreadSafeDataBuffer::decode(Decoder& decoder, ThreadSafeDataBuffer& result)
{
bool hasData;
if (!decoder.decode(hasData))
return false;
if (hasData) {
Vector<uint8_t> data;
if (!decoder.decode(data))
return false;
result = ThreadSafeDataBuffer::adoptVector(data);
}
return true;
}
} // namespace WebCore
#endif // ThreadSafeDataBuffer_h
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