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SocketSink Class Reference

#include <socketft.h>

Inheritance diagram for SocketSink:

NetworkSink Socket NonblockingSink Sink BufferedTransformation Algorithm Waitable Clonable List of all members.

Detailed Description

socket-based implementation of NetworkSink

Definition at line 200 of file socketft.h.


virtual void IsolatedInitialize (const NameValuePairs &parameters)
virtual bool IsolatedMessageSeriesEnd (bool blocking)
virtual void Initialize (const NameValuePairs &parameters=g_nullNameValuePairs, int propagation=-1)
 initialize or reinitialize this object
virtual bool Flush (bool hardFlush, int propagation=-1, bool blocking=true)
 flush buffered input and/or output
virtual bool MessageSeriesEnd (int propagation=-1, bool blocking=true)
 mark end of a series of messages
virtual void SetAutoSignalPropagation (int propagation)
 set propagation of automatically generated and transferred signals
virtual int GetAutoSignalPropagation () const


virtual bool Attachable ()
 returns whether this object allows attachment
virtual BufferedTransformationAttachedTransformation ()
 returns the object immediately attached to this object or NULL for no attachment
virtual const BufferedTransformationAttachedTransformation () const
virtual void Detach (BufferedTransformation *newAttachment=0)
 delete the current attachment chain and replace it with newAttachment
virtual void Attach (BufferedTransformation *newAttachment)
 add newAttachment to the end of attachment chain

Public Member Functions

 SocketSink (socket_t s=INVALID_SOCKET, unsigned int maxBufferSize=0, unsigned int autoFlushBound=16 *1024)
void SendEof ()
unsigned int GetMaxWaitObjectCount () const
 maximum number of wait objects that this object can return
void GetWaitObjects (WaitObjectContainer &container)
 put wait objects into container
unsigned int Put2 (const byte *inString, unsigned int length, int messageEnd, bool blocking)
 input multiple bytes for blocking or non-blocking processing
unsigned int TimedFlush (unsigned long maxTime, unsigned int targetSize=0)
 flush to device for no more than maxTime milliseconds
void SetMaxBufferSize (unsigned int maxBufferSize)
void SetAutoFlushBound (unsigned int bound)
 set a bound which will cause sink to flush if exceeded by GetCurrentBufferSize()
unsigned int GetMaxBufferSize () const
unsigned int GetCurrentBufferSize () const
void ClearBuffer ()
float ComputeCurrentSpeed ()
 compute the current speed of this sink in bytes per second
float GetMaxObservedSpeed () const
 get the maximum observed speed of this sink in bytes per second
bool IsolatedFlush (bool hardFlush, bool blocking)
BufferedTransformationRef ()
 return a reference to this object
virtual std::string AlgorithmName () const
 returns name of this algorithm, not universally implemented yet
virtual ClonableClone () const
 this is not implemented by most classes yet
bool Wait (unsigned long milliseconds)
 wait on this object
bool GetOwnership () const
void SetOwnership (bool own)
 operator socket_t ()
socket_t GetSocket () const
void AttachSocket (socket_t s, bool own=false)
socket_t DetachSocket ()
void CloseSocket ()
void Create (int nType=SOCK_STREAM)
void Bind (unsigned int port, const char *addr=NULL)
void Bind (const sockaddr *psa, socklen_t saLen)
void Listen (int backlog=5)
bool Connect (const char *addr, unsigned int port)
bool Connect (const sockaddr *psa, socklen_t saLen)
bool Accept (Socket &s, sockaddr *psa=NULL, socklen_t *psaLen=NULL)
void GetSockName (sockaddr *psa, socklen_t *psaLen)
unsigned int Send (const byte *buf, unsigned int bufLen, int flags=0)
unsigned int Receive (byte *buf, unsigned int bufLen, int flags=0)
void ShutDown (int how=SD_SEND)
void IOCtl (long cmd, unsigned long *argp)
bool SendReady (const timeval *timeout)
bool ReceiveReady (const timeval *timeout)
virtual void HandleError (const char *operation) const
void CheckAndHandleError_int (const char *operation, int result) const
void CheckAndHandleError (const char *operation, socket_t result) const
void CheckAndHandleError (const char *operation, BOOL result) const

Static Public Member Functions

unsigned int PortNameToNumber (const char *name, const char *protocol="tcp")
 look up the port number given its name, returns 0 if not found
void StartSockets ()
 start Windows Sockets 2
void ShutdownSockets ()
 calls WSACleanup for Windows Sockets
int GetLastError ()
 returns errno or WSAGetLastError
void SetLastError (int errorCode)
 sets errno or calls WSASetLastError

Static Public Attributes

const std::string NULL_CHANNEL

Protected Member Functions

const NetworkSenderGetSender () const
unsigned int TransferTo2 (BufferedTransformation &target, unsigned long &transferBytes, const std::string &channel=NULL_CHANNEL, bool blocking=true)
unsigned int CopyRangeTo2 (BufferedTransformation &target, unsigned long &begin, unsigned long end=ULONG_MAX, const std::string &channel=NULL_CHANNEL, bool blocking=true) const
virtual void SocketChanged ()

Static Protected Member Functions

int DecrementPropagation (int propagation)

Protected Attributes

socket_t m_s
bool m_own

Member Function Documentation

unsigned int NetworkSink::Put2 const byte *  inString,
unsigned int  length,
int  messageEnd,
bool  blocking
[virtual, inherited]

input multiple bytes for blocking or non-blocking processing

messageEnd means how many filters to signal MessageEnd to, including this one

Implements BufferedTransformation.

Definition at line 190 of file network.cpp.

References ByteQueue::CurrentSize(), ByteQueue::FinalizeLazyPut(), INFINITE_TIME, ByteQueue::LazyPut(), NetworkSender::SendEof(), NetworkSink::TimedFlush(), and ByteQueue::UndoLazyPut().

unsigned int NetworkSink::TimedFlush unsigned long  maxTime,
unsigned int  targetSize = 0
[virtual, inherited]

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) {}

number of bytes flushed

Implements NonblockingSink.

Definition at line 227 of file network.cpp.

References ByteQueue::AnyRetrievable(), NetworkSink::ComputeCurrentSpeed(), ByteQueue::CurrentSize(), TimerBase::ElapsedTime(), NetworkSender::GetSendResult(), INFINITE_TIME, NetworkSender::MustWaitForResult(), NetworkSender::MustWaitToSend(), NetworkSender::Send(), BufferedTransformation::Skip(), ByteQueue::Spy(), and Waitable::Wait().

Referenced by NetworkSink::Put2().

BufferedTransformation& BufferedTransformation::Ref  )  [inline, inherited]

return a reference to this object

This function is useful for passing a temporary BufferedTransformation object to a function that takes a non-const reference. Definition at line 711 of file cryptlib.h.

virtual byte* BufferedTransformation::CreatePutSpace unsigned int &  size  )  [inline, virtual, inherited]

request space which can be written into by the caller, and then used as input to Put()

The purpose of this method is to help avoid doing extra memory allocations.

Reimplemented in MeterFilter, HashFilter, Redirector, ArraySink, ArrayXorSink, and ByteQueue.

Definition at line 730 of file cryptlib.h.

Referenced by ArrayXorSink::CreatePutSpace().

virtual unsigned int BufferedTransformation::PutModifiable2 byte *  inString,
unsigned int  length,
int  messageEnd,
bool  blocking
[inline, virtual, inherited]

input multiple bytes that may be modified by callee for blocking or non-blocking processing

messageEnd means how many filters to signal MessageEnd to, including this one

Reimplemented in MeterFilter, and FilterWithBufferedInput.

Definition at line 748 of file cryptlib.h.

bool BufferedTransformation::Flush bool  hardFlush,
int  propagation = -1,
bool  blocking = true
[virtual, inherited]

flush buffered input and/or output

hardFlush is used to indicate whether all data should be flushed
Hard flushes must be used with care. It means try to process and output everything, even if there may not be enough data to complete the action. For example, hard flushing a HexDecoder would cause an error if you do it after inputing an odd number of hex encoded characters. For some types of filters, for example ZlibDecompressor, hard flushes can only be done at "synchronization points". These synchronization points are positions in the data stream that are created by hard flushes on the corresponding reverse filters, in this example ZlibCompressor. This is useful when zlib compressed data is moved across a network in packets and compression state is preserved across packets, as in the ssh2 protocol.

Reimplemented in Filter, Redirector, SecretSharing, and InformationDispersal.

Definition at line 195 of file cryptlib.cpp.

References BufferedTransformation::AttachedTransformation().

bool BufferedTransformation::MessageSeriesEnd int  propagation = -1,
bool  blocking = true
[virtual, inherited]

mark end of a series of messages

There should be a MessageEnd immediately before MessageSeriesEnd.

Reimplemented in Filter, and Redirector.

Definition at line 201 of file cryptlib.cpp.

References BufferedTransformation::AttachedTransformation().

virtual void BufferedTransformation::SetAutoSignalPropagation int  propagation  )  [inline, virtual, inherited]

set propagation of automatically generated and transferred signals

propagation == 0 means do not automaticly generate signals

Reimplemented in SourceTemplate< T >, SourceTemplate< FileStore >, SourceTemplate< RandomNumberStore >, and SourceTemplate< StringStore >.

Definition at line 788 of file cryptlib.h.

unsigned long BufferedTransformation::MaxRetrievable  )  const [virtual, inherited]

returns number of bytes that is currently ready for retrieval

All retrieval functions return the actual number of bytes retrieved, which is the lesser of the request number and MaxRetrievable().

Reimplemented in FileStore, RandomNumberStore, NullStore, MessageQueue, ByteQueue, and RandomPool.

Definition at line 247 of file cryptlib.cpp.

References BufferedTransformation::AttachedTransformation(), and BufferedTransformation::CopyTo().

Referenced by RandomNumberStore::AnyRetrievable(), and Integer::BERDecode().

bool BufferedTransformation::GetNextMessage  )  [virtual, inherited]

start retrieving the next message

Returns false if no more messages exist or this message is not completely retrieved.

Reimplemented in MessageQueue, and Store.

Definition at line 336 of file cryptlib.cpp.

References BufferedTransformation::AnyMessages(), and BufferedTransformation::AttachedTransformation().

virtual bool BufferedTransformation::Attachable  )  [inline, virtual, inherited]

returns whether this object allows attachment

Some BufferedTransformation objects (e.g. Filter objects) allow other BufferedTransformation objects to be attached. When this is done, the first object instead of buffering its output, sents that output to the attached object as input. The entire attachment chain is deleted when the anchor object is destructed.

Reimplemented in Filter.

Definition at line 934 of file cryptlib.h.

Referenced by BufferedTransformation::Attach().

bool Waitable::Wait unsigned long  milliseconds  )  [inherited]

wait on this object

same as creating an empty container, calling GetWaitObjects(), and calling Wait() on the container Definition at line 321 of file wait.cpp.

References Waitable::GetWaitObjects(), and WaitObjectContainer::Wait().

Referenced by NetworkSource::GeneralPump2(), and NetworkSink::TimedFlush().

The documentation for this class was generated from the following file:
Generated on Wed Jul 21 19:16:10 2004 for Crypto++ by doxygen 1.3.7-20040704