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/*
* Copyright (C) 2018-2022 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. 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 INC. 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.
*/
#include "config.h"
#include "SharedBufferReference.h"
#include "Decoder.h"
#include "Encoder.h"
#include "SharedMemory.h"
#include "WebCoreArgumentCoders.h"
namespace IPC {
using namespace WebCore;
using namespace WebKit;
void SharedBufferReference::encode(Encoder& encoder) const
{
#if USE(UNIX_DOMAIN_SOCKETS)
encoder << m_buffer;
#else
encoder << isNull();
if (isNull())
return;
encoder << m_size;
if (!m_size)
return;
SharedMemory::Handle handle;
{
auto sharedMemoryBuffer = m_memory ? m_memory : SharedMemory::copyBuffer(*m_buffer);
if (auto memoryHandle = sharedMemoryBuffer->createHandle(SharedMemory::Protection::ReadOnly))
handle = WTFMove(*memoryHandle);
}
encoder << WTFMove(handle);
#endif
}
std::optional<SharedBufferReference> SharedBufferReference::decode(Decoder& decoder)
{
RefPtr<SharedBuffer> buffer;
#if USE(UNIX_DOMAIN_SOCKETS)
if (!decoder.decode(buffer))
return std::nullopt;
return { IPC::SharedBufferReference(WTFMove(buffer)) };
#else
std::optional<bool> isNull;
decoder >> isNull;
if (!isNull)
return std::nullopt;
if (*isNull)
return { IPC::SharedBufferReference { WTFMove(buffer) } };
size_t bufferSize = 0;
if (!decoder.decode(bufferSize))
return std::nullopt;
if (!bufferSize) {
buffer = SharedBuffer::create();
return { IPC::SharedBufferReference(WTFMove(buffer)) };
}
SharedMemory::Handle handle;
if (!decoder.decode(handle))
return std::nullopt;
auto sharedMemoryBuffer = SharedMemory::map(WTFMove(handle), SharedMemory::Protection::ReadOnly);
if (!sharedMemoryBuffer)
return std::nullopt;
if (sharedMemoryBuffer->size() < bufferSize)
return std::nullopt;
return { IPC::SharedBufferReference { sharedMemoryBuffer.releaseNonNull(), bufferSize } };
#endif
}
RefPtr<WebCore::SharedBuffer> SharedBufferReference::unsafeBuffer() const
{
#if !USE(UNIX_DOMAIN_SOCKETS)
RELEASE_ASSERT_WITH_MESSAGE(isEmpty() || (!m_buffer && m_memory), "Must only be called on IPC's receiver side");
if (m_memory)
return m_memory->createSharedBuffer(m_size);
#endif
if (m_buffer)
return m_buffer->makeContiguous();
return nullptr;
}
const uint8_t* SharedBufferReference::data() const
{
#if !USE(UNIX_DOMAIN_SOCKETS)
RELEASE_ASSERT_WITH_MESSAGE(isEmpty() || (!m_buffer && m_memory), "Must only be called on IPC's receiver side");
if (m_memory)
return static_cast<uint8_t*>(m_memory->data());
#endif
if (!m_buffer || !m_buffer->isContiguous())
return nullptr;
return downcast<SharedBuffer>(m_buffer.get())->data();
}
RefPtr<WebKit::SharedMemory> SharedBufferReference::sharedCopy() const
{
if (!m_size)
return nullptr;
return SharedMemory::copyBuffer(*unsafeBuffer());
}
} // namespace IPC
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