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// network.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "network.h"
#include "wait.h"
NAMESPACE_BEGIN(CryptoPP)
unsigned int NonblockingSource::PumpMessages2(unsigned int &messageCount, bool blocking)
{
if (messageCount == 0)
return 0;
unsigned long byteCount = ULONG_MAX;
messageCount = 0;
RETURN_IF_NONZERO(Pump2(byteCount, blocking));
if (!m_messageEndSent && SourceExhausted())
{
RETURN_IF_NONZERO(AttachedTransformation()->Put2(NULL, 0, GetAutoSignalPropagation(), true));
m_messageEndSent = true;
messageCount = 1;
}
return 0;
}
bool NonblockingSink::IsolatedFlush(bool hardFlush, bool blocking)
{
TimedFlush(blocking ? INFINITE_TIME : 0);
return hardFlush && !!GetCurrentBufferSize();
}
// *************************************************************
#ifdef HIGHRES_TIMER_AVAILABLE
NetworkSource::NetworkSource(BufferedTransformation *attachment)
: NonblockingSource(attachment), m_buf(1024*16)
, m_waitingForResult(false), m_outputBlocked(false)
, m_dataBegin(0), m_dataEnd(0)
{
}
void NetworkSource::GetWaitObjects(WaitObjectContainer &container)
{
if (!m_outputBlocked)
{
if (m_dataBegin == m_dataEnd)
AccessReceiver().GetWaitObjects(container);
else
container.SetNoWait();
}
AttachedTransformation()->GetWaitObjects(container);
}
unsigned int NetworkSource::GeneralPump2(unsigned long &byteCount, bool blockingOutput, unsigned long maxTime, bool checkDelimiter, byte delimiter)
{
NetworkReceiver &receiver = AccessReceiver();
unsigned long maxSize = byteCount;
byteCount = 0;
bool forever = maxTime == INFINITE_TIME;
Timer timer(Timer::MILLISECONDS, forever);
BufferedTransformation *t = AttachedTransformation();
if (m_outputBlocked)
goto DoOutput;
while (true)
{
if (m_dataBegin == m_dataEnd)
{
if (receiver.EofReceived())
break;
if (m_waitingForResult)
{
if (receiver.MustWaitForResult() && !receiver.Wait(SaturatingSubtract(maxTime, timer.ElapsedTime())))
break;
unsigned int recvResult = receiver.GetReceiveResult();
m_dataEnd += recvResult;
m_waitingForResult = false;
if (!receiver.MustWaitToReceive() && !receiver.EofReceived() && m_dataEnd != m_buf.size())
goto ReceiveNoWait;
}
else
{
m_dataEnd = m_dataBegin = 0;
if (receiver.MustWaitToReceive())
{
if (!receiver.Wait(SaturatingSubtract(maxTime, timer.ElapsedTime())))
break;
receiver.Receive(m_buf+m_dataEnd, m_buf.size()-m_dataEnd);
m_waitingForResult = true;
}
else
{
ReceiveNoWait:
m_waitingForResult = true;
// call Receive repeatedly as long as data is immediately available,
// because some receivers tend to return data in small pieces
while (receiver.Receive(m_buf+m_dataEnd, m_buf.size()-m_dataEnd))
{
unsigned int recvResult = receiver.GetReceiveResult();
m_dataEnd += recvResult;
if (receiver.EofReceived() || m_dataEnd == m_buf.size())
{
m_waitingForResult = false;
break;
}
}
}
}
}
else
{
m_putSize = STDMIN((unsigned long)m_dataEnd-m_dataBegin, maxSize-byteCount);
if (checkDelimiter)
m_putSize = std::find(m_buf+m_dataBegin, m_buf+m_dataBegin+m_putSize, delimiter) - (m_buf+m_dataBegin);
DoOutput:
unsigned int result = t->PutModifiable2(m_buf+m_dataBegin, m_putSize, 0, forever || blockingOutput);
if (result)
{
if (t->Wait(SaturatingSubtract(maxTime, timer.ElapsedTime())))
goto DoOutput;
else
{
m_outputBlocked = true;
return result;
}
}
m_outputBlocked = false;
byteCount += m_putSize;
m_dataBegin += m_putSize;
if (checkDelimiter && m_dataBegin < m_dataEnd && m_buf[m_dataBegin] == delimiter)
break;
if (byteCount == maxSize)
break;
// once time limit is reached, return even if there is more data waiting
// but make 0 a special case so caller can request a large amount of data to be
// pumped as long as it is immediately available
if (maxTime > 0 && timer.ElapsedTime() > maxTime)
break;
}
}
return 0;
}
// *************************************************************
NetworkSink::NetworkSink(unsigned int maxBufferSize, bool autoFlush)
: m_maxBufferSize(maxBufferSize), m_autoFlush(autoFlush)
, m_needSendResult(false), m_buffer(STDMIN(16U*1024U, maxBufferSize)), m_blockedBytes(0)
{
}
unsigned int NetworkSink::Put2(const byte *inString, unsigned int length, int messageEnd, bool blocking)
{
if (m_blockedBytes)
{
assert(length >= m_blockedBytes);
inString += length - m_blockedBytes;
length = m_blockedBytes;
}
LazyPutter lp(m_buffer, inString, length);
unsigned int targetSize = messageEnd ? 0 : m_maxBufferSize;
TimedFlush(blocking ? INFINITE_TIME : 0, m_autoFlush ? 0 : targetSize);
if (m_buffer.CurrentSize() > targetSize)
{
assert(!blocking);
m_blockedBytes = STDMIN(m_buffer.CurrentSize() - targetSize, (unsigned long)length);
m_buffer.UndoLazyPut(m_blockedBytes);
return STDMAX(m_blockedBytes, 1U);
}
m_blockedBytes = 0;
if (messageEnd)
AccessSender().SendEof();
return 0;
}
unsigned int NetworkSink::TimedFlush(unsigned long maxTime, unsigned int targetSize)
{
NetworkSender &sender = AccessSender();
bool forever = maxTime == INFINITE_TIME;
Timer timer(Timer::MILLISECONDS, forever);
unsigned int totalFlushSize = 0;
while (true)
{
if (m_buffer.CurrentSize() <= targetSize)
break;
if (m_needSendResult)
{
if (sender.MustWaitForResult() && !sender.Wait(SaturatingSubtract(maxTime, timer.ElapsedTime())))
break;
unsigned int sendResult = sender.GetSendResult();
m_buffer.Skip(sendResult);
totalFlushSize += sendResult;
m_needSendResult = false;
if (!m_buffer.AnyRetrievable())
break;
}
unsigned long timeOut = maxTime ? SaturatingSubtract(maxTime, timer.ElapsedTime()) : 0;
if (sender.MustWaitToSend() && !sender.Wait(timeOut))
break;
unsigned int contiguousSize = 0;
const byte *block = m_buffer.Spy(contiguousSize);
sender.Send(block, contiguousSize);
m_needSendResult = true;
if (maxTime > 0 && timeOut == 0)
break; // once time limit is reached, return even if there is more data waiting
}
return totalFlushSize;
}
#endif // #ifdef HIGHRES_TIMER_AVAILABLE
NAMESPACE_END
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