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// network.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "network.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*4), m_bufSize(0), m_state(NORMAL)
{
}
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);
unsigned long timeout;
BufferedTransformation *t = AttachedTransformation();
if (m_state == OUTPUT_BLOCKED)
goto DoOutput;
while (true)
{
if (m_state == WAITING_FOR_RESULT)
{
if (receiver.MustWaitForResult())
{
timeout = SaturatingSubtract(maxTime, timer.ElapsedTime());
if (!receiver.Wait(timeout))
break;
}
unsigned int recvResult = receiver.GetReceiveResult();
// assert(recvResult > 0 || receiver.EofReceived());
m_bufSize += recvResult;
m_state = NORMAL;
}
if (m_bufSize == 0)
{
if (receiver.EofReceived())
break;
}
else
{
m_putSize = STDMIN((unsigned long)m_bufSize, maxSize - byteCount);
if (checkDelimiter)
m_putSize = std::find(m_buf.begin(), m_buf+m_putSize, delimiter) - m_buf;
DoOutput:
unsigned int result = t->PutModifiable2(m_buf, m_putSize, 0, forever || blockingOutput);
if (result)
{
timeout = SaturatingSubtract(maxTime, timer.ElapsedTime());
if (t->Wait(timeout))
goto DoOutput;
else
{
m_state = OUTPUT_BLOCKED;
return result;
}
}
m_state = NORMAL;
byteCount += m_putSize;
m_bufSize -= m_putSize;
if (m_bufSize > 0)
{
memmove(m_buf, m_buf+m_putSize, m_bufSize);
if (checkDelimiter && m_buf[0] == delimiter)
break;
}
}
if (byteCount == maxSize)
break;
unsigned long elapsed = timer.ElapsedTime();
if (elapsed > maxTime)
break; // once time limit is reached, return even if there is more data waiting
if (receiver.MustWaitToReceive())
{
if (!receiver.Wait(maxTime - elapsed))
break;
}
receiver.Receive(m_buf+m_bufSize, m_buf.size()-m_bufSize);
m_state = WAITING_FOR_RESULT;
}
return 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;
}
m_buffer.LazyPut(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);
m_buffer.FinalizeLazyPut();
return STDMAX(m_blockedBytes, 1U);
}
m_blockedBytes = 0;
if (messageEnd)
AccessSender().SendEof();
return 0;
}
unsigned int NetworkSink::TimedFlush(unsigned long maxTime, unsigned int targetSize)
{
if (m_buffer.IsEmpty())
return 0;
NetworkSender &sender = AccessSender();
bool forever = maxTime == INFINITE_TIME;
Timer timer(Timer::MILLISECONDS, forever);
unsigned long timeout;
unsigned int totalFlushSize = 0;
while (true)
{
if (m_needSendResult)
{
if (sender.MustWaitForResult())
{
timeout = SaturatingSubtract(maxTime, timer.ElapsedTime());
if (!sender.Wait(timeout))
break;
}
unsigned int sendResult = sender.GetSendResult();
m_buffer.Skip(sendResult);
totalFlushSize += sendResult;
m_needSendResult = false;
if (m_buffer.CurrentSize() <= targetSize)
break;
}
unsigned long elapsed = timer.ElapsedTime();
if (elapsed > maxTime)
break; // once time limit is reached, return even if there is more data waiting
if (sender.MustWaitToSend())
{
if (!sender.Wait(maxTime - elapsed))
break;
}
unsigned int contiguousSize = 0;
const byte *block = m_buffer.Spy(contiguousSize);
sender.Send(block, contiguousSize);
m_needSendResult = true;
}
return totalFlushSize;
}
#endif // #ifdef HIGHRES_TIMER_AVAILABLE
NAMESPACE_END
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