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/*
* Copyright (C) 2019 Sony Interactive Entertainment Inc.
*
* 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 "RemoteInspectorMessageParser.h"
#include <wtf/ByteOrder.h>
#if ENABLE(REMOTE_INSPECTOR)
namespace Inspector {
/*
| <--- one message for send / didReceiveData ---> |
+--------------+----------------------------------+--------------
| size | data | (next message)
| 4byte (NBO) | variable length |
+--------------+----------------------------------+--------------
| <------------ size ------------> |
*/
MessageParser::MessageParser(Function<void(Vector<uint8_t>&&)>&& listener)
: m_listener(WTFMove(listener))
{
}
Vector<uint8_t> MessageParser::createMessage(std::span<const uint8_t> data)
{
if (data.empty() || data.size() > std::numeric_limits<uint32_t>::max())
return Vector<uint8_t>();
auto messageBuffer = Vector<uint8_t>(data.size() + sizeof(uint32_t));
uint32_t nboSize = htonl(static_cast<uint32_t>(data.size()));
memcpy(&messageBuffer[0], &nboSize, sizeof(uint32_t));
memcpy(&messageBuffer[sizeof(uint32_t)], data.data(), data.size());
return messageBuffer;
}
void MessageParser::pushReceivedData(std::span<const uint8_t> data)
{
if (data.empty() || !m_listener)
return;
m_buffer.append(data);
if (!parse())
clearReceivedData();
}
void MessageParser::clearReceivedData()
{
m_buffer.clear();
}
bool MessageParser::parse()
{
while (m_buffer.size() >= sizeof(uint32_t)) {
uint32_t dataSize;
memcpy(&dataSize, &m_buffer[0], sizeof(uint32_t));
dataSize = ntohl(dataSize);
if (!dataSize) {
LOG_ERROR("Message Parser received an invalid message size");
return false;
}
size_t messageSize = (sizeof(uint32_t) + dataSize);
if (m_buffer.size() < messageSize) {
// Wait for more data.
return true;
}
// FIXME: This should avoid re-creating a new data Vector.
auto dataBuffer = Vector<uint8_t>(dataSize);
memcpy(&dataBuffer[0], &m_buffer[sizeof(uint32_t)], dataSize);
m_listener(WTFMove(dataBuffer));
m_buffer.remove(0, messageSize);
}
return true;
}
} // namespace Inspector
#endif // ENABLE(REMOTE_INSPECTOR)
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