1 files changed, 235 insertions, 0 deletions

diff --git a/CryptoPP/network.h b/CryptoPP/network.h
new file mode 100644
index 000000000..96cd4567e
--- /dev/null
+++ b/CryptoPP/network.h
@@ -0,0 +1,235 @@
+#ifndef CRYPTOPP_NETWORK_H
+#define CRYPTOPP_NETWORK_H
+
+#include "config.h"
+
+#ifdef HIGHRES_TIMER_AVAILABLE
+
+#include "filters.h"
+#include "hrtimer.h"
+
+#include <deque>
+
+NAMESPACE_BEGIN(CryptoPP)
+
+class LimitedBandwidth
+{
+public:
+	LimitedBandwidth(lword maxBytesPerSecond = 0)
+		: m_maxBytesPerSecond(maxBytesPerSecond), m_timer(Timer::MILLISECONDS)
+		, m_nextTransceiveTime(0)
+		{ m_timer.StartTimer(); }
+
+	lword GetMaxBytesPerSecond() const
+		{ return m_maxBytesPerSecond; }
+
+	void SetMaxBytesPerSecond(lword v)
+		{ m_maxBytesPerSecond = v; }
+
+	lword ComputeCurrentTransceiveLimit();
+
+	double TimeToNextTransceive();
+
+	void NoteTransceive(lword size);
+
+public:
+	/*! GetWaitObjects() must be called despite the 0 return from GetMaxWaitObjectCount();
+	    the 0 is because the ScheduleEvent() method is used instead of adding a wait object */
+	unsigned int GetMaxWaitObjectCount() const { return 0; }
+	void GetWaitObjects(WaitObjectContainer &container, const CallStack &callStack);
+
+private:	
+	lword m_maxBytesPerSecond;
+
+	typedef std::deque<std::pair<double, lword> > OpQueue;
+	OpQueue m_ops;
+
+	Timer m_timer;
+	double m_nextTransceiveTime;
+
+	void ComputeNextTransceiveTime();
+	double GetCurTimeAndCleanUp();
+};
+
+//! a Source class that can pump from a device for a specified amount of time.
+class CRYPTOPP_NO_VTABLE NonblockingSource : public AutoSignaling<Source>, public LimitedBandwidth
+{
+public:
+	NonblockingSource(BufferedTransformation *attachment)
+		: m_messageEndSent(false) , m_doPumpBlocked(false), m_blockedBySpeedLimit(false) {Detach(attachment);}
+
+	//!	\name NONBLOCKING SOURCE
+	//@{
+
+	//! pump up to maxSize bytes using at most maxTime milliseconds
+	/*! If checkDelimiter is true, pump up to delimiter, which itself is not extracted or pumped. */
+	size_t GeneralPump2(lword &byteCount, bool blockingOutput=true, unsigned long maxTime=INFINITE_TIME, bool checkDelimiter=false, byte delimiter='\n');
+
+	lword GeneralPump(lword maxSize=LWORD_MAX, unsigned long maxTime=INFINITE_TIME, bool checkDelimiter=false, byte delimiter='\n')
+	{
+		GeneralPump2(maxSize, true, maxTime, checkDelimiter, delimiter);
+		return maxSize;
+	}
+	lword TimedPump(unsigned long maxTime)
+		{return GeneralPump(LWORD_MAX, maxTime);}
+	lword PumpLine(byte delimiter='\n', lword maxSize=1024)
+		{return GeneralPump(maxSize, INFINITE_TIME, true, delimiter);}
+
+	size_t Pump2(lword &byteCount, bool blocking=true)
+		{return GeneralPump2(byteCount, blocking, blocking ? INFINITE_TIME : 0);}
+	size_t PumpMessages2(unsigned int &messageCount, bool blocking=true);
+	//@}
+
+protected:
+	virtual size_t DoPump(lword &byteCount, bool blockingOutput,
+		unsigned long maxTime, bool checkDelimiter, byte delimiter) =0;
+
+	bool BlockedBySpeedLimit() const { return m_blockedBySpeedLimit; }
+
+private:
+	bool m_messageEndSent, m_doPumpBlocked, m_blockedBySpeedLimit;
+};
+
+//! Network Receiver
+class CRYPTOPP_NO_VTABLE NetworkReceiver : public Waitable
+{
+public:
+	virtual bool MustWaitToReceive() {return false;}
+	virtual bool MustWaitForResult() {return false;}
+	//! receive data from network source, returns whether result is immediately available
+	virtual bool Receive(byte* buf, size_t bufLen) =0;
+	virtual unsigned int GetReceiveResult() =0;
+	virtual bool EofReceived() const =0;
+};
+
+class CRYPTOPP_NO_VTABLE NonblockingSinkInfo
+{
+public:
+	virtual ~NonblockingSinkInfo() {}
+	virtual size_t GetMaxBufferSize() const =0;
+	virtual size_t GetCurrentBufferSize() const =0;
+	virtual bool EofPending() const =0;
+	//! compute the current speed of this sink in bytes per second
+	virtual float ComputeCurrentSpeed() =0;
+	//! get the maximum observed speed of this sink in bytes per second
+	virtual float GetMaxObservedSpeed() const =0;
+};
+
+//! a Sink class that queues input and can flush to a device for a specified amount of time.
+class CRYPTOPP_NO_VTABLE NonblockingSink : public Sink, public NonblockingSinkInfo, public LimitedBandwidth
+{
+public:
+	NonblockingSink() : m_blockedBySpeedLimit(false) {}
+
+	bool IsolatedFlush(bool hardFlush, bool blocking);
+
+	//! flush to device for no more than maxTime milliseconds
+	/*! This function will repeatedly attempt to flush data to some device, until
+		the queue is empty, or a total of maxTime milliseconds have elapsed.
+		If maxTime == 0, at least one attempt will be made to flush some data, but
+		it is likely that not all queued data will be flushed, even if the device
+		is ready to receive more data without waiting. If you want to flush as much data
+		as possible without waiting for the device, call this function in a loop.
+		For example: while (sink.TimedFlush(0) > 0) {}
+		\return number of bytes flushed
+	*/
+	lword TimedFlush(unsigned long maxTime, size_t targetSize = 0);
+
+	virtual void SetMaxBufferSize(size_t maxBufferSize) =0;
+	//! set a bound which will cause sink to flush if exceeded by GetCurrentBufferSize()
+	virtual void SetAutoFlushBound(size_t bound) =0;
+
+protected:
+	virtual lword DoFlush(unsigned long maxTime, size_t targetSize) = 0;
+
+	bool BlockedBySpeedLimit() const { return m_blockedBySpeedLimit; }
+
+private:
+	bool m_blockedBySpeedLimit;
+};
+
+//! Network Sender
+class CRYPTOPP_NO_VTABLE NetworkSender : public Waitable
+{
+public:
+	virtual bool MustWaitToSend() {return false;}
+	virtual bool MustWaitForResult() {return false;}
+	virtual void Send(const byte* buf, size_t bufLen) =0;
+	virtual unsigned int GetSendResult() =0;
+	virtual bool MustWaitForEof() {return false;}
+	virtual void SendEof() =0;
+	virtual bool EofSent() {return false;}	// implement if MustWaitForEof() == true
+};
+
+//! Network Source
+class CRYPTOPP_NO_VTABLE NetworkSource : public NonblockingSource
+{
+public:
+	NetworkSource(BufferedTransformation *attachment);
+
+	unsigned int GetMaxWaitObjectCount() const;
+	void GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack);
+
+	bool SourceExhausted() const {return m_dataBegin == m_dataEnd && GetReceiver().EofReceived();}
+
+protected:
+	size_t DoPump(lword &byteCount, bool blockingOutput, unsigned long maxTime, bool checkDelimiter, byte delimiter);
+
+	virtual NetworkReceiver & AccessReceiver() =0;
+	const NetworkReceiver & GetReceiver() const {return const_cast<NetworkSource *>(this)->AccessReceiver();}
+
+private:
+	SecByteBlock m_buf;
+	size_t m_putSize, m_dataBegin, m_dataEnd;
+	bool m_waitingForResult, m_outputBlocked;
+};
+
+//! Network Sink
+class CRYPTOPP_NO_VTABLE NetworkSink : public NonblockingSink
+{
+public:
+	NetworkSink(unsigned int maxBufferSize, unsigned int autoFlushBound);
+
+	unsigned int GetMaxWaitObjectCount() const;
+	void GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack);
+
+	size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking);
+
+	void SetMaxBufferSize(size_t maxBufferSize) {m_maxBufferSize = maxBufferSize; m_buffer.SetNodeSize(UnsignedMin(maxBufferSize, 16U*1024U+256U));}
+	void SetAutoFlushBound(size_t bound) {m_autoFlushBound = bound;}
+
+	size_t GetMaxBufferSize() const {return m_maxBufferSize;}
+	size_t GetCurrentBufferSize() const {return (size_t)m_buffer.CurrentSize();}
+
+	void ClearBuffer() { m_buffer.Clear(); }
+
+	bool EofPending() const { return m_eofState > EOF_NONE && m_eofState < EOF_DONE; }
+
+	//! compute the current speed of this sink in bytes per second
+	float ComputeCurrentSpeed();
+	//! get the maximum observed speed of this sink in bytes per second
+	float GetMaxObservedSpeed() const;
+
+protected:
+	lword DoFlush(unsigned long maxTime, size_t targetSize);
+
+	virtual NetworkSender & AccessSender() =0;
+	const NetworkSender & GetSender() const {return const_cast<NetworkSink *>(this)->AccessSender();}
+
+private:
+	enum EofState { EOF_NONE, EOF_PENDING_SEND, EOF_PENDING_DELIVERY, EOF_DONE };
+
+	size_t m_maxBufferSize, m_autoFlushBound;
+	bool m_needSendResult, m_wasBlocked;
+	EofState m_eofState;
+	ByteQueue m_buffer;
+	size_t m_skipBytes;
+	Timer m_speedTimer;
+	float m_byteCountSinceLastTimerReset, m_currentSpeed, m_maxObservedSpeed;
+};
+
+NAMESPACE_END
+
+#endif	// #ifdef HIGHRES_TIMER_AVAILABLE
+
+#endif