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FileStore Class Reference

#include <files.h>

Inheritance diagram for FileStore:

Store AutoSignaling< InputRejecting< BufferedTransformation > > InputRejecting< BufferedTransformation > BufferedTransformation Algorithm Waitable Clonable List of all members.

Detailed Description

file-based implementation of Store interface

Definition at line 14 of file files.h.

ATTACHMENT

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

 FileStore (std::istream &in)
 FileStore (const char *filename)
std::istream * GetStream ()
unsigned long MaxRetrievable () const
 returns number of bytes that is currently ready for retrieval
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
unsigned long Skip (unsigned long skipMax=ULONG_MAX)
 discard skipMax bytes from the output buffer
void IsolatedInitialize (const NameValuePairs &parameters)
unsigned int NumberOfMessages () const
 number of times MessageEnd() has been received minus messages retrieved or skipped
bool GetNextMessage ()
 start retrieving the next message
unsigned int CopyMessagesTo (BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=NULL_CHANNEL) const
void SetAutoSignalPropagation (int propagation)
 set propagation of automatically generated and transferred signals
int GetAutoSignalPropagation () const
unsigned int Put2 (const byte *begin, unsigned int length, int messageEnd, bool blocking)
 input multiple bytes for blocking or non-blocking processing
bool IsolatedFlush (bool, bool)
bool IsolatedMessageSeriesEnd (bool)
unsigned int ChannelPut2 (const std::string &channel, const byte *begin, unsigned int length, int messageEnd, bool blocking)
bool ChannelMessageSeriesEnd (const std::string &, int, bool)
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

Static Protected Member Functions

int DecrementPropagation (int propagation)

Protected Attributes

bool m_messageEnd


Member Function Documentation

unsigned long FileStore::MaxRetrievable  )  const [virtual]
 

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 from BufferedTransformation.

Definition at line 40 of file files.cpp.

bool Store::GetNextMessage  )  [virtual, inherited]
 

start retrieving the next message

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

Reimplemented from BufferedTransformation.

Definition at line 844 of file filters.cpp.

References BufferedTransformation::AnyRetrievable().

void AutoSignaling< InputRejecting< BufferedTransformation > >::SetAutoSignalPropagation int  propagation  )  [inline, virtual, inherited]
 

Reimplemented from BufferedTransformation.

Definition at line 168 of file simple.h.

unsigned int InputRejecting< BufferedTransformation >::Put2 const byte *  begin,
unsigned int  length,
int  messageEnd,
bool  blocking
[inline, virtual, inherited]
 

Implements BufferedTransformation.

Definition at line 99 of file simple.h.

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()

Note:
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

Parameters:
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

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 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 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 files:
Generated on Wed Jul 21 19:15:51 2004 for Crypto++ by doxygen 1.3.7-20040704