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/*
* Copyright (C) 2020 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 Fform 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 "StreamConnectionBuffer.h"
#include "WebCoreArgumentCoders.h"
namespace IPC {
static Ref<WebKit::SharedMemory> createMemory(size_t size)
{
auto memory = WebKit::SharedMemory::allocate(size);
if (!memory)
CRASH();
return memory.releaseNonNull();
}
StreamConnectionBuffer::StreamConnectionBuffer(size_t memorySize)
: m_dataSize(memorySize - headerSize())
, m_sharedMemory(createMemory(memorySize))
{
ASSERT(m_dataSize > 0);
ASSERT(m_dataSize <= maximumSize());
}
StreamConnectionBuffer::StreamConnectionBuffer(Ref<WebKit::SharedMemory>&& memory)
: m_dataSize(memory->size() - headerSize())
, m_sharedMemory(WTFMove(memory))
{
ASSERT(m_dataSize > 0);
ASSERT(m_dataSize <= maximumSize());
}
StreamConnectionBuffer::StreamConnectionBuffer(StreamConnectionBuffer&& other) = default;
StreamConnectionBuffer::~StreamConnectionBuffer() = default;
StreamConnectionBuffer& StreamConnectionBuffer::operator=(StreamConnectionBuffer&& other)
{
if (this != &other) {
m_dataSize = other.m_dataSize;
m_sharedMemory = WTFMove(other.m_sharedMemory);
}
return *this;
}
void StreamConnectionBuffer::encode(Encoder& encoder) const
{
WebKit::SharedMemory::Handle handle;
if (!m_sharedMemory->createHandle(handle, WebKit::SharedMemory::Protection::ReadWrite))
CRASH();
encoder << handle;
}
std::optional<StreamConnectionBuffer> StreamConnectionBuffer::decode(Decoder& decoder)
{
auto handle = decoder.decode<WebKit::SharedMemory::Handle>();
if (UNLIKELY(!decoder.isValid()))
return std::nullopt;
if (UNLIKELY(handle->size() <= headerSize()))
return std::nullopt;
if (UNLIKELY(handle->size() > headerSize() + maximumSize()))
return std::nullopt;
auto sharedMemory = WebKit::SharedMemory::map(*handle, WebKit::SharedMemory::Protection::ReadWrite);
if (UNLIKELY(!sharedMemory))
return std::nullopt;
return StreamConnectionBuffer { sharedMemory.releaseNonNull() };
}
Span<uint8_t> StreamConnectionBuffer::headerForTesting()
{
return { static_cast<uint8_t*>(m_sharedMemory->data()), headerSize() };
}
Span<uint8_t> StreamConnectionBuffer::dataForTesting()
{
return { data(), m_sharedMemory->size() - headerSize() };
}
}
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