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ProxyFilter Class Reference

#include <filters.h>

Inheritance diagram for ProxyFilter:

FilterWithBufferedInput Filter BufferedTransformation Algorithm Waitable Clonable DefaultDecryptor DefaultDecryptorWithMAC DefaultEncryptor DefaultEncryptorWithMAC SimpleProxyFilter Base64Encoder HexEncoder PK_DecryptorFilter PK_EncryptorFilter List of all members.

Detailed Description

Base class for Filter classes that are proxies for a chain of other filters.

Definition at line 438 of file filters.h.

Public Member Functions

 ProxyFilter (BufferedTransformation *filter, unsigned int firstSize, unsigned int lastSize, BufferedTransformation *attachment)
bool IsolatedFlush (bool hardFlush, bool blocking)
void SetFilter (Filter *filter)
void NextPutMultiple (const byte *s, unsigned int len)
void IsolatedInitialize (const NameValuePairs &parameters)
unsigned int Put2 (const byte *inString, unsigned int length, int messageEnd, bool blocking)
 input multiple bytes for blocking or non-blocking processing

unsigned int PutModifiable2 (byte *inString, unsigned int length, int messageEnd, bool blocking)
 input multiple bytes that may be modified by callee for blocking or non-blocking processing

void ForceNextPut ()
bool Attachable ()
 returns whether this object allows attachment

BufferedTransformationAttachedTransformation ()
 returns the object immediately attached to this object or NULL for no attachment

const BufferedTransformationAttachedTransformation () const
void Detach (BufferedTransformation *newAttachment=NULL)
 delete the current attachment chain and replace it with newAttachment

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
void Initialize (const NameValuePairs &parameters=g_nullNameValuePairs, int propagation=-1)
 initialize or reinitialize this object

bool Flush (bool hardFlush, int propagation=-1, bool blocking=true)
 flush buffered input and/or output

bool MessageSeriesEnd (int propagation=-1, bool blocking=true)
 mark end of a series of messages

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


Static Public Attributes

const std::string NULL_CHANNEL

Protected Member Functions

bool DidFirstPut ()
virtual void InitializeDerivedAndReturnNewSizes (const NameValuePairs &parameters, unsigned int &firstSize, unsigned int &blockSize, unsigned int &lastSize)
virtual void InitializeDerived (const NameValuePairs &parameters)
virtual void FirstPut (const byte *inString)=0
virtual void NextPutSingle (const byte *inString)
virtual void NextPutModifiable (byte *inString, unsigned int length)
virtual void LastPut (const byte *inString, unsigned int length)=0
virtual void FlushDerived ()
virtual void NotifyAttachmentChange ()
virtual BufferedTransformationNewDefaultAttachment () const
void Insert (Filter *nextFilter)
virtual bool ShouldPropagateMessageEnd () const
virtual bool ShouldPropagateMessageSeriesEnd () const
void PropagateInitialize (const NameValuePairs &parameters, int propagation, const std::string &channel=NULL_CHANNEL)
unsigned int Output (int outputSite, const byte *inString, unsigned int length, int messageEnd, bool blocking, const std::string &channel=NULL_CHANNEL)
bool OutputMessageEnd (int outputSite, int propagation, bool blocking, const std::string &channel=NULL_CHANNEL)
bool OutputFlush (int outputSite, bool hardFlush, int propagation, bool blocking, const std::string &channel=NULL_CHANNEL)
bool OutputMessageSeriesEnd (int outputSite, int propagation, bool blocking, const std::string &channel=NULL_CHANNEL)

Static Protected Member Functions

int DecrementPropagation (int propagation)

Protected Attributes

member_ptr< BufferedTransformationm_filter
unsigned int m_inputPosition
int m_continueAt


Member Function Documentation

bool ProxyFilter::IsolatedFlush bool  hardFlush,
bool  blocking
[virtual]
 

calls ForceNextPut() if hardFlush is true

Reimplemented from FilterWithBufferedInput.

Definition at line 400 of file filters.cpp.

References IsolatedFlush().

Referenced by IsolatedFlush().

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

input multiple bytes for blocking or non-blocking processing

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

Implements BufferedTransformation.

Definition at line 136 of file filters.h.

References FilterWithBufferedInput::Put2().

Referenced by FilterWithBufferedInput::Put2().

unsigned int FilterWithBufferedInput::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

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

Reimplemented from BufferedTransformation.

Definition at line 140 of file filters.h.

References FilterWithBufferedInput::PutModifiable2().

Referenced by FilterWithBufferedInput::PutModifiable2().

void FilterWithBufferedInput::ForceNextPut  )  [inherited]
 

The input buffer may contain more than blockSize bytes if lastSize != 0. ForceNextPut() forces a call to NextPut() if this is the case.

Definition at line 347 of file filters.cpp.

Referenced by FilterWithBufferedInput::IsolatedFlush().

bool Filter::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 from BufferedTransformation.

Definition at line 19 of file filters.h.

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

flush buffered input and/or output

Parameters:
hardFlush is used to indicate whether all data should be flushed
Note:
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 from BufferedTransformation.

Definition at line 67 of file filters.cpp.

References Filter::Flush().

Referenced by Filter::Flush().

bool Filter::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 from BufferedTransformation.

Definition at line 81 of file filters.cpp.

References Filter::MessageSeriesEnd().

Referenced by Filter::MessageSeriesEnd().

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 681 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()

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

Definition at line 700 of file cryptlib.h.

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

set propagation of automatically generated and transfered signals

propagation == 0 means do not automaticly generate signals

Definition at line 758 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().

Definition at line 226 of file cryptlib.cpp.

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

bool BufferedTransformation::GetNextMessage  )  [virtual, inherited]
 

start retrieving the next message

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

Definition at line 315 of file cryptlib.cpp.

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

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 247 of file wait.cpp.

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

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


The documentation for this class was generated from the following files:
Generated on Wed Jul 28 08:07:15 2004 for Crypto++ by doxygen 1.3.7