Interface for buffered transformations. More...

#include <cryptlib.h>

Inheritance diagram for BufferedTransformation:

Collaboration diagram for BufferedTransformation:

Classes
class	BlockingInputOnly
	Exception thrown by objects that have not implemented nonblocking input processing. More...

struct	InvalidChannelName
	Exception thrown when a filter does not recognize a named channel. More...

struct	NoChannelSupport
	Exception thrown when a filter does not support named channels. More...

Public Member Functions
virtual	~BufferedTransformation ()

	BufferedTransformation ()
	Construct a BufferedTransformation. More...

BufferedTransformation &	Ref ()
	Provides a reference to this object. More...

Public Member Functions inherited from Algorithm
virtual	~Algorithm ()

	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms. More...

virtual std::string	AlgorithmName () const
	Provides the name of this algorithm. More...

Public Member Functions inherited from Clonable
virtual	~Clonable ()

virtual Clonable *	Clone () const
	Copies this object. More...

Public Member Functions inherited from Waitable
virtual	~Waitable ()

bool	Wait (unsigned long milliseconds, CallStack const &callStack)
	Wait on this object. More...

Static Public Attributes
static const std::string &	NULL_CHANNEL = DEFAULT_CHANNEL

Static Protected Member Functions
static int	DecrementPropagation (int propagation)
	Decrements the propagation count while clamping at 0. More...

Private Attributes
byte	m_buf [4]

INPUT
size_t	Put (byte inByte, bool blocking=true)
	Input a byte for processing. More...

size_t	Put (const byte *inString, size_t length, bool blocking=true)
	Input a byte buffer for processing. More...

size_t	PutWord16 (word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 16-bit word for processing. More...

size_t	PutWord32 (word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 32-bit word for processing. More...

virtual byte *	CreatePutSpace (size_t &size)
	Request space which can be written into by the caller. More...

virtual bool	CanModifyInput () const
	Determines whether input can be modified by the callee. More...

size_t	PutModifiable (byte *inString, size_t length, bool blocking=true)
	Input multiple bytes that may be modified by callee. More...

bool	MessageEnd (int propagation=-1, bool blocking=true)
	Signals the end of messages to the object. More...

size_t	PutMessageEnd (const byte *inString, size_t length, int propagation=-1, bool blocking=true)
	Input multiple bytes for processing and signal the end of a message. More...

virtual size_t	Put2 (const byte *inString, size_t length, int messageEnd, bool blocking)=0
	Input multiple bytes for processing. More...

virtual size_t	PutModifiable2 (byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes that may be modified by callee. More...

WAITING
unsigned int	GetMaxWaitObjectCount () const
	Retrieves the maximum number of waitable objects. More...

void	GetWaitObjects (WaitObjectContainer &container, CallStack const &callStack)
	Retrieves waitable objects. More...

SIGNALS
virtual void	IsolatedInitialize (const NameValuePairs &parameters)
	Initialize or reinitialize this object, without signal propagation. More...

virtual bool	IsolatedFlush (bool hardFlush, bool blocking)=0
	Flushes data buffered by this object, without signal propagation. More...

virtual bool	IsolatedMessageSeriesEnd (bool blocking)
	Marks the end of a series of messages, without signal propagation. More...

virtual void	Initialize (const NameValuePairs &parameters=g_nullNameValuePairs, int propagation=-1)
	Initialize or reinitialize this object, with signal propagation. More...

virtual bool	Flush (bool hardFlush, int propagation=-1, bool blocking=true)
	Flush buffered input and/or output, with signal propagation. More...

virtual bool	MessageSeriesEnd (int propagation=-1, bool blocking=true)
	Marks the end of a series of messages, with signal propagation. More...

virtual void	SetAutoSignalPropagation (int propagation)
	Set propagation of automatically generated and transferred signals. More...

virtual int	GetAutoSignalPropagation () const
	Retrieve automatic signal propagation value. More...

RETRIEVAL OF ONE MESSAGE
virtual lword	MaxRetrievable () const
	Provides the number of bytes ready for retrieval. More...

virtual bool	AnyRetrievable () const
	Determines whether bytes are ready for retrieval. More...

virtual size_t	Get (byte &outByte)
	Retrieve a 8-bit byte. More...

virtual size_t	Get (byte *outString, size_t getMax)
	Retrieve a block of bytes. More...

virtual size_t	Peek (byte &outByte) const
	Peek a 8-bit byte. More...

virtual size_t	Peek (byte *outString, size_t peekMax) const
	Peek a block of bytes. More...

size_t	GetWord16 (word16 &value, ByteOrder order=BIG_ENDIAN_ORDER)
	Retrieve a 16-bit word. More...

size_t	GetWord32 (word32 &value, ByteOrder order=BIG_ENDIAN_ORDER)
	Retrieve a 32-bit word. More...

size_t	PeekWord16 (word16 &value, ByteOrder order=BIG_ENDIAN_ORDER) const
	Peek a 16-bit word. More...

size_t	PeekWord32 (word32 &value, ByteOrder order=BIG_ENDIAN_ORDER) const
	Peek a 32-bit word. More...

lword	TransferTo (BufferedTransformation &target, lword transferMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL)
	move transferMax bytes of the buffered output to target as input More...

virtual lword	Skip (lword skipMax=LWORD_MAX)
	Discard skipMax bytes from the output buffer. More...

lword	CopyTo (BufferedTransformation &target, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
	copy copyMax bytes of the buffered output to target as input More...

lword	CopyRangeTo (BufferedTransformation &target, lword position, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
	Copy bytes from this object using an index to another BufferedTransformation. More...

RETRIEVAL OF MULTIPLE MESSAGES
virtual lword	TotalBytesRetrievable () const
	Provides the number of bytes ready for retrieval. More...

virtual unsigned int	NumberOfMessages () const
	Provides the number of meesages processed by this object. More...

virtual bool	AnyMessages () const
	Determines if any messages are available for retrieval. More...

virtual bool	GetNextMessage ()
	Start retrieving the next message. More...

virtual unsigned int	SkipMessages (unsigned int count=UINT_MAX)
	Skip a number of meessages. More...

unsigned int	TransferMessagesTo (BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL)
	Transfer messages from this object to another BufferedTransformation. More...

unsigned int	CopyMessagesTo (BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) const
	Copy messages from this object to another BufferedTransformation. More...

virtual void	SkipAll ()
	Skip all messages in the series. More...

void	TransferAllTo (BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL)
	Transfer all bytes from this object to another BufferedTransformation. More...

void	CopyAllTo (BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL) const
	Copy messages from this object to another BufferedTransformation. More...

virtual bool	GetNextMessageSeries ()
	Retrieve the next message in a series. More...

virtual unsigned int	NumberOfMessagesInThisSeries () const
	Provides the number of messages in a series. More...

virtual unsigned int	NumberOfMessageSeries () const
	Provides the number of messages in a series. More...

NON-BLOCKING TRANSFER OF OUTPUT
virtual size_t	TransferTo2 (BufferedTransformation &target, lword &byteCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)=0
	Transfer bytes from this object to another BufferedTransformation. More...

virtual size_t	CopyRangeTo2 (BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const =0
	Copy bytes from this object to another BufferedTransformation. More...

size_t	TransferMessagesTo2 (BufferedTransformation &target, unsigned int &messageCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
	Transfer messages from this object to another BufferedTransformation. More...

size_t	TransferAllTo2 (BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
	Transfer all bytes from this object to another BufferedTransformation. More...

CHANNELS
size_t	ChannelPut (const std::string &channel, byte inByte, bool blocking=true)
	Input a byte for processing on a channel. More...

size_t	ChannelPut (const std::string &channel, const byte *inString, size_t length, bool blocking=true)
	Input a byte buffer for processing on a channel. More...

size_t	ChannelPutModifiable (const std::string &channel, byte *inString, size_t length, bool blocking=true)
	Input multiple bytes that may be modified by callee on a channel. More...

size_t	ChannelPutWord16 (const std::string &channel, word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 16-bit word for processing on a channel. More...

size_t	ChannelPutWord32 (const std::string &channel, word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 32-bit word for processing on a channel. More...

bool	ChannelMessageEnd (const std::string &channel, int propagation=-1, bool blocking=true)
	Signal the end of a message. More...

size_t	ChannelPutMessageEnd (const std::string &channel, const byte *inString, size_t length, int propagation=-1, bool blocking=true)
	Input multiple bytes for processing and signal the end of a message. More...

virtual byte *	ChannelCreatePutSpace (const std::string &channel, size_t &size)
	Request space which can be written into by the caller. More...

virtual size_t	ChannelPut2 (const std::string &channel, const byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes for processing on a channel. More...

virtual size_t	ChannelPutModifiable2 (const std::string &channel, byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes that may be modified by callee on a channel. More...

virtual bool	ChannelFlush (const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true)
	Flush buffered input and/or output on a channel. More...

virtual bool	ChannelMessageSeriesEnd (const std::string &channel, int propagation=-1, bool blocking=true)
	Marks the end of a series of messages on a channel. More...

virtual void	SetRetrievalChannel (const std::string &channel)
	Sets the default retrieval channel. More...

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, sends that output to the attached object as input. The entire attachment chain is deleted when the anchor object is destructed.
virtual bool	Attachable ()
	Determines whether the object allows attachment. More...

virtual BufferedTransformation *	AttachedTransformation ()
	Returns the object immediately attached to this object. More...

virtual const BufferedTransformation *	AttachedTransformation () const
	Returns the object immediately attached to this object. More...

virtual void	Detach (BufferedTransformation *newAttachment=0)
	Delete the current attachment chain and attach a new one. More...

virtual void	Attach (BufferedTransformation *newAttachment)
	Add newAttachment to the end of attachment chain. More...

Detailed Description

Interface for buffered transformations.

BufferedTransformation is a generalization of BlockTransformation, StreamTransformation and HashTransformation.

A buffered transformation is an object that takes a stream of bytes as input (this may be done in stages), does some computation on them, and then places the result into an internal buffer for later retrieval. Any partial result already in the output buffer is not modified by further input.

If a method takes a "blocking" parameter, and you pass false for it, then the method will return before all input has been processed if the input cannot be processed without waiting (for network buffers to become available, for example). In this case the method will return true or a non-zero integer value. When this happens you must continue to call the method with the same parameters until it returns false or zero, before calling any other method on it or attached /p BufferedTransformation. The integer return value in this case is approximately the number of bytes left to be processed, and can be used to implement a progress bar.

For functions that take a "propagation" parameter, propagation != 0 means pass on the signal to attached BufferedTransformation objects, with propagation decremented at each step until it reaches 0. -1 means unlimited propagation.

All of the retrieval functions, like Get() and GetWord32(), return the actual number of bytes retrieved, which is the lesser of the request number and MaxRetrievable().

Most of the input functions, like Put() and PutWord32(), return the number of bytes remaining to be processed. A 0 value means all bytes were processed, and a non-0 value means bytes remain to be processed.

Definition at line 1352 of file cryptlib.h.

Constructor & Destructor Documentation

virtual BufferedTransformation::~BufferedTransformation ( )

inlinevirtual

Definition at line 1358 of file cryptlib.h.

BufferedTransformation::BufferedTransformation ( )

inline

Construct a BufferedTransformation.

Definition at line 1361 of file cryptlib.h.

Member Function Documentation

bool BufferedTransformation::AnyMessages ( ) const

virtual

Determines if any messages are available for retrieval.

Returns: true if NumberOfMessages() > 0, false otherwise

AnyMessages returns true if NumberOfMessages() > 0

Definition at line 577 of file cryptlib.cpp.

bool BufferedTransformation::AnyRetrievable ( ) const

virtual

Determines whether bytes are ready for retrieval.

Returns: true if bytes are available for retrieval, false otherwise

Reimplemented in RandomNumberStore, MessageQueue, and ByteQueue.

Definition at line 504 of file cryptlib.cpp.

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void BufferedTransformation::Attach ( BufferedTransformation * newAttachment )

virtual

Add newAttachment to the end of attachment chain.

Parameters

newAttachment the attachment to add to the end of the chain

Definition at line 772 of file cryptlib.cpp.

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virtual bool BufferedTransformation::Attachable ( )

inlinevirtual

Determines whether the object allows attachment.

Returns: true if the object allows an attachment, false otherwise

Sources and Filters will returns true, while Sinks and other objects will return false.

Reimplemented in Filter.

Definition at line 1995 of file cryptlib.h.

virtual BufferedTransformation* BufferedTransformation::AttachedTransformation ( )

inlinevirtual

Returns the object immediately attached to this object.

Returns: the attached transformation

AttachedTransformation() returns NULL if there is no attachment. The non-const version of AttachedTransformation() always returns NULL.

Reimplemented in Filter.

Definition at line 2001 of file cryptlib.h.

virtual const BufferedTransformation* BufferedTransformation::AttachedTransformation ( ) const

inlinevirtual

Returns the object immediately attached to this object.

Returns: the attached transformation

AttachedTransformation() returns NULL if there is no attachment. The non-const version of AttachedTransformation() always returns NULL.

Reimplemented in Filter.

Definition at line 2007 of file cryptlib.h.

virtual bool BufferedTransformation::CanModifyInput ( ) const

inlinevirtual

Determines whether input can be modified by the callee.

Returns: true if input can be modified, false otherwise

The base class implementation returns false.

Reimplemented in Redirector.

Definition at line 1417 of file cryptlib.h.

byte * BufferedTransformation::ChannelCreatePutSpace	(	const std::string &	channel,
		size_t &	size
	)

virtual

Request space which can be written into by the caller.

Parameters

channel	the channel to process the data
size	the requested size of the buffer

Returns: a pointer to a memroy block with length size

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

size is an IN and OUT parameter and used as a hint. When the call is made, size is the requested size of the buffer. When the call returns, size is the size of the array returned to the caller.

The base class implementation sets size to 0 and returns NULL.

Note: Some objects, like ArraySink(), cannot create a space because its fixed. In the case of an ArraySink(), the pointer to the array is returned and the size is remaining size.

Reimplemented in OutputProxy, Redirector, AuthenticatedDecryptionFilter, AuthenticatedEncryptionFilter, Multichannel< Filter >, Multichannel< Sink >, and ChannelSwitch.

Definition at line 456 of file cryptlib.cpp.

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bool BufferedTransformation::ChannelFlush	(	const std::string &	channel,
		bool	hardFlush,
		int	propagation = `-1`,
		bool	blocking = `true`
	)

virtual

Flush buffered input and/or output on a channel.

Parameters

channel	the channel to flush the data
hardFlush	is used to indicate whether all data should be flushed
propagation	the number of attached transformations the ChannelFlush() signal should be passed
blocking	specifies whether the object should block when processing input

Returns: true of the Flush was successful

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Reimplemented in OutputProxy, Redirector, Multichannel< Filter >, Multichannel< Sink >, ChannelSwitch, Unflushable< Filter >, Unflushable< Sink >, and Unflushable< Multichannel< Filter > >.

Definition at line 480 of file cryptlib.cpp.

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bool BufferedTransformation::ChannelMessageEnd	(	const std::string &	channel,
		int	propagation = `-1`,
		bool	blocking = `true`
	)

inline

Signal the end of a message.

Parameters

channel	the channel to process the data.
propagation	the number of attached transformations the ChannelMessageEnd() signal should be passed
blocking	specifies whether the object should block when processing input

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed.

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Definition at line 1913 of file cryptlib.h.

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bool BufferedTransformation::ChannelMessageSeriesEnd	(	const std::string &	channel,
		int	propagation = `-1`,
		bool	blocking = `true`
	)

virtual

Marks the end of a series of messages on a channel.

Parameters

channel	the channel to signal the end of a series of messages
propagation	the number of attached transformations the ChannelMessageSeriesEnd() signal should be passed
blocking	specifies whether the object should block when processing input

Each object that receives the signal will perform its processing, decrement propagation, and then pass the signal on to attached transformations if the value is not 0.

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Note: There should be a MessageEnd() immediately before MessageSeriesEnd().

Reimplemented in OutputProxy, Redirector, InputRejecting< BufferedTransformation >, InputRejecting< Filter >, ChannelSwitch, and EqualityComparisonFilter.

Definition at line 488 of file cryptlib.cpp.

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size_t BufferedTransformation::ChannelPut	(	const std::string &	channel,
		byte	inByte,
		bool	blocking = `true`
	)

inline

Input a byte for processing on a channel.

Parameters

channel	the channel to process the data.
inByte	the 8-bit byte (octet) to be processed.
blocking	specifies whether the object should block when processing input.

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed.

Definition at line 1864 of file cryptlib.h.

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size_t BufferedTransformation::ChannelPut	(	const std::string &	channel,
		const byte *	inString,
		size_t	length,
		bool	blocking = `true`
	)

inline

Input a byte buffer for processing on a channel.

Parameters

channel	the channel to process the data
inString	the byte buffer to process
length	the size of the string, in bytes
blocking	specifies whether the object should block when processing input

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed.

Definition at line 1874 of file cryptlib.h.

size_t BufferedTransformation::ChannelPut2	(	const std::string &	channel,
		const byte *	inString,
		size_t	length,
		int	messageEnd,
		bool	blocking
	)

virtual

Input multiple bytes for processing on a channel.

Parameters

channel	the channel to process the data.
inString	the byte buffer to process.
length	the size of the string, in bytes.
messageEnd	means how many filters to signal MessageEnd() to, including this one.
blocking	specifies whether the object should block when processing input.

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Reimplemented in OutputProxy, Redirector, AuthenticatedDecryptionFilter, AuthenticatedEncryptionFilter, Multichannel< Filter >, Multichannel< Sink >, InputRejecting< BufferedTransformation >, InputRejecting< Filter >, ChannelSwitch, EqualityComparisonFilter, and RawIDA.

Definition at line 464 of file cryptlib.cpp.

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size_t BufferedTransformation::ChannelPutMessageEnd	(	const std::string &	channel,
		const byte *	inString,
		size_t	length,
		int	propagation = `-1`,
		bool	blocking = `true`
	)

inline

Input multiple bytes for processing and signal the end of a message.

Parameters

channel	the channel to process the data.
inString	the byte buffer to process
length	the size of the string, in bytes
propagation	the number of attached transformations the ChannelPutMessageEnd() signal should be passed
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Definition at line 1925 of file cryptlib.h.

size_t BufferedTransformation::ChannelPutModifiable	(	const std::string &	channel,
		byte *	inString,
		size_t	length,
		bool	blocking = `true`
	)

inline

Input multiple bytes that may be modified by callee on a channel.

Parameters

channel	the channel to process the data.
inString	the byte buffer to process
length	the size of the string, in bytes
blocking	specifies whether the object should block when processing input

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed.

Definition at line 1884 of file cryptlib.h.

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size_t BufferedTransformation::ChannelPutModifiable2	(	const std::string &	channel,
		byte *	inString,
		size_t	length,
		int	messageEnd,
		bool	blocking
	)

virtual

Input multiple bytes that may be modified by callee on a channel.

Parameters

channel	the channel to process the data
inString	the byte buffer to process
length	the size of the string, in bytes
messageEnd	means how many filters to signal MessageEnd() to, including this one
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Reimplemented in OutputProxy, Redirector, Multichannel< Filter >, Multichannel< Sink >, and ChannelSwitch.

Definition at line 472 of file cryptlib.cpp.

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size_t BufferedTransformation::ChannelPutWord16	(	const std::string &	channel,
		word16	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`,
		bool	blocking = `true`
	)

Input a 16-bit word for processing on a channel.

Parameters

channel	the channel to process the data.
value	the 16-bit value to be processed.
order	the ByteOrder of the value to be processed.
blocking	specifies whether the object should block when processing input.

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed.

Definition at line 702 of file cryptlib.cpp.

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size_t BufferedTransformation::ChannelPutWord32	(	const std::string &	channel,
		word32	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`,
		bool	blocking = `true`
	)

Input a 32-bit word for processing on a channel.

Parameters

channel	the channel to process the data.
value	the 32-bit value to be processed.
order	the ByteOrder of the value to be processed.
blocking	specifies whether the object should block when processing input.

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed.

Definition at line 708 of file cryptlib.cpp.

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void BufferedTransformation::CopyAllTo	(	BufferedTransformation &	target,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)		const

Copy messages from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
channel	the channel on which the transfer should occur

CopyAllTo copies messages from this object and copies them to the destination.

Definition at line 685 of file cryptlib.cpp.

unsigned int BufferedTransformation::CopyMessagesTo	(	BufferedTransformation &	target,
		unsigned int	count = `UINT_MAX`,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)		const

Copy messages from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
count	the number of messages to transfer
channel	the channel on which the transfer should occur

Returns: the number of bytes that remain in the current transfer block (i.e., bytes not transferred)

CopyMessagesTo copies messages from this object and copies them to the destination. If all bytes are not transferred for a message, then processing stops and the number of remaining bytes is returned. CopyMessagesTo() does not proceed to the next message.

A return value of 0 indicates all messages were successfully copied.

Definition at line 634 of file cryptlib.cpp.

lword BufferedTransformation::CopyRangeTo	(	BufferedTransformation &	target,
		lword	position,
		lword	copyMax = `LWORD_MAX`,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)		const

inline

Copy bytes from this object using an index to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
position	the 0-based index of the byte stream to begin the copying
copyMax	the number of bytes to copy
channel	the channel on which the transfer should occur

Returns: the number of bytes copied during the call.

CopyTo copies bytes from this object to the destination. The bytes remain in this object. Copying begins at the index position in the current stream, and not from an absolute position in the stream.

The function returns the new position in the stream after transferring the bytes starting at the index.

Definition at line 1692 of file cryptlib.h.

virtual size_t BufferedTransformation::CopyRangeTo2	(	BufferedTransformation &	target,
		lword &	begin,
		lword	end = `LWORD_MAX`,
		const std::string &	channel = `DEFAULT_CHANNEL`,
		bool	blocking = `true`
	)		const

pure virtual

Copy bytes from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
begin	the 0-based index of the first byte to copy in the stream
end	the 0-based index of the last byte to copy in the stream
channel	the channel on which the transfer should occur
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the copy block (i.e., bytes not copied)

CopyRangeTo2 copies bytes from this object to the destination. The bytes are not removed from this object. Copying begins at the index position in the current stream, and not from an absolute position in the stream.

begin is an IN and OUT parameter. When the call is made, begin is the starting position of the copy. When the call returns, begin is the position of the first byte that was not copied (which may be different tahn end). begin can be used for subsequent calls to CopyRangeTo2.

Implemented in NullStore, RandomNumberStore, StringStore, Sink, BERGeneralDecoder, ByteQueue::Walker, Filter, FileStore, ByteQueue, and MessageQueue.

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lword BufferedTransformation::CopyTo	(	BufferedTransformation &	target,
		lword	copyMax = `LWORD_MAX`,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)		const

inline

copy copyMax bytes of the buffered output to target as input

Copy bytes from this object to another BufferedTransformation

Parameters

target	the destination BufferedTransformation
copyMax	the number of bytes to copy
channel	the channel on which the transfer should occur

Returns: the number of bytes copied during the call.

CopyTo copies bytes from this object to the destination. The bytes are not removed from this object.

The function always returns copyMax. If an accurate count is needed, then use CopyRangeTo2.

Definition at line 1679 of file cryptlib.h.

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virtual byte* BufferedTransformation::CreatePutSpace ( size_t & size )

inlinevirtual

Request space which can be written into by the caller.

Parameters

size	the requested size of the buffer

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

size is an IN and OUT parameter and used as a hint. When the call is made, size is the requested size of the buffer. When the call returns, size is the size of the array returned to the caller.

The base class implementation sets size to 0 and returns NULL.

Note: Some objects, like ArraySink, cannot create a space because its fixed. In the case of an ArraySink, the pointer to the array is returned and the size is remaining size.

Reimplemented in ArrayXorSink, ArraySink, OutputProxy, Redirector, HashFilter, MeterFilter, Multichannel< Filter >, Multichannel< Sink >, and ByteQueue.

Definition at line 1411 of file cryptlib.h.

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static int BufferedTransformation::DecrementPropagation ( int propagation )

inlinestaticprotected

Decrements the propagation count while clamping at 0.

Returns: the decremented propagation or 0

Definition at line 2029 of file cryptlib.h.

virtual void BufferedTransformation::Detach ( BufferedTransformation * newAttachment = 0 )

inlinevirtual

Delete the current attachment chain and attach a new one.

Parameters

newAttachment the new BufferedTransformation to attach

Exceptions

NotImplemented

Detach delete the current attachment chain and replace it with an optional newAttachment

If a derived class does not override Detach, then the base class throws NotImplemented.

Reimplemented in Filter.

Definition at line 2016 of file cryptlib.h.

bool BufferedTransformation::Flush	(	bool	hardFlush,
		int	propagation = `-1`,
		bool	blocking = `true`
	)

virtual

Flush buffered input and/or output, with signal propagation.

Parameters

hardFlush	is used to indicate whether all data should be flushed
propagation	the number of attached transformations the Flush() signal should be passed
blocking	specifies whether the object should block when processing input

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

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, like 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 OutputProxy, Redirector, Multichannel< Filter >, Multichannel< Sink >, CustomFlushPropagation< Filter >, CustomFlushPropagation< Sink >, InformationDispersal, Unflushable< Filter >, Unflushable< Sink >, Unflushable< Multichannel< Filter > >, SecretSharing, and Filter.

Definition at line 442 of file cryptlib.cpp.

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size_t BufferedTransformation::Get ( byte & outByte )

virtual

Retrieve a 8-bit byte.

Parameters

outByte the 8-bit value to be retrieved

Returns: the number of bytes consumed during the call.

Use the return value of Get to detect short reads.

Reimplemented in ByteQueue::Walker, and ByteQueue.

Definition at line 515 of file cryptlib.cpp.

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size_t BufferedTransformation::Get	(	byte *	outString,
		size_t	getMax
	)

virtual

Retrieve a block of bytes.

Parameters

outString	a block of bytes
getMax	the number of bytes to Get

Returns: the number of bytes consumed during the call.

Use the return value of Get to detect short reads.

Reimplemented in ByteQueue::Walker, and ByteQueue.

Definition at line 523 of file cryptlib.cpp.

virtual int BufferedTransformation::GetAutoSignalPropagation ( ) const

inlinevirtual

Retrieve automatic signal propagation value.

Returns: the number of attached transformations the signal is propagated to. 0 indicates the signal is only witnessed by this object

Reimplemented in SourceTemplate< T >, SourceTemplate< FileStore >, SourceTemplate< RandomNumberStore >, SourceTemplate< StringStore >, AutoSignaling< BufferedTransformation >, AutoSignaling< InputRejecting< BufferedTransformation > >, AutoSignaling< Filter >, and AutoSignaling< Unflushable< Multichannel< Filter > > >.

Definition at line 1566 of file cryptlib.h.

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unsigned int BufferedTransformation::GetMaxWaitObjectCount ( ) const

virtual

Retrieves the maximum number of waitable objects.

Implements Waitable.

Reimplemented in Redirector.

Definition at line 422 of file cryptlib.cpp.

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bool BufferedTransformation::GetNextMessage ( )

virtual

Start retrieving the next message.

Returns: true if a message is ready for retrieval

GetNextMessage() returns true if a message is ready for retrieval; false if no more messages exist or this message is not completely retrieved.

Reimplemented in Store, and MessageQueue.

Definition at line 585 of file cryptlib.cpp.

virtual bool BufferedTransformation::GetNextMessageSeries ( )

inlinevirtual

Retrieve the next message in a series.

Returns: true if a message was retreved, false otherwise

Internally, the base class implementation returns false.

Definition at line 1775 of file cryptlib.h.

void BufferedTransformation::GetWaitObjects	(	WaitObjectContainer &	container,
		CallStack const &	callStack
	)

virtual

Retrieves waitable objects.

Parameters

container	the wait container to receive the references to the objects
callStack	CallStack object used to select waitable objects

GetWaitObjects is usually called in one of two ways. First, it can be called like something.GetWaitObjects(c, CallStack("my func after X", 0));. Second, if in an outer GetWaitObjects() method that itself takes a callStack parameter, it can be called like innerThing.GetWaitObjects(c, CallStack("MyClass::GetWaitObjects at X", &callStack));.

Implements Waitable.

Reimplemented in Redirector.

Definition at line 428 of file cryptlib.cpp.

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size_t BufferedTransformation::GetWord16	(	word16 &	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`
	)

Retrieve a 16-bit word.

Parameters

value	the 16-bit value to be retrieved
order	the ByteOrder of the value to be processed.

Returns: the number of bytes consumed during the call.

Use the return value of GetWord16 to detect short reads.

Definition at line 762 of file cryptlib.cpp.

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size_t BufferedTransformation::GetWord32	(	word32 &	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`
	)

Retrieve a 32-bit word.

Parameters

value	the 32-bit value to be retrieved
order	the ByteOrder of the value to be processed.

Returns: the number of bytes consumed during the call.

Use the return value of GetWord16 to detect short reads.

Definition at line 767 of file cryptlib.cpp.

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void BufferedTransformation::Initialize	(	const NameValuePairs &	parameters = `g_nullNameValuePairs`,
		int	propagation = `-1`
	)

virtual

Initialize or reinitialize this object, with signal propagation.

Parameters

parameters	a set of NameValuePairs to initialize or reinitialize this object
propagation	the number of attached transformations the Initialize() signal should be passed

Initialize() is used to initialize or reinitialize an object using a variable number of arbitrarily typed arguments. The function avoids the need for multiple constructors providing all possible combintations of configurable parameters.

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Reimplemented in OutputProxy, Redirector, CustomSignalPropagation< Sink >, and Filter.

Definition at line 435 of file cryptlib.cpp.

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virtual bool BufferedTransformation::IsolatedFlush	(	bool	hardFlush,
		bool	blocking
	)

pure virtual

Flushes data buffered by this object, without signal propagation.

Parameters

hardFlush	indicates whether all data should be flushed
blocking	specifies whether the object should block when processing input

Note: hardFlush must be used with care

Implemented in ProxyFilter, FilterWithBufferedInput, CustomFlushPropagation< Filter >, CustomFlushPropagation< Sink >, FileSink, InputRejecting< BufferedTransformation >, InputRejecting< Filter >, Deflator, Inflator, Unflushable< Filter >, Unflushable< Sink >, Unflushable< Multichannel< Filter > >, Bufferless< BufferedTransformation >, Bufferless< Filter >, Bufferless< Sink >, and MessageQueue.

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virtual void BufferedTransformation::IsolatedInitialize ( const NameValuePairs & parameters )

inlinevirtual

Initialize or reinitialize this object, without signal propagation.

Parameters

parameters a set of NameValuePairs to initialize this object

Exceptions

NotImplemented

IsolatedInitialize() is used to initialize or reinitialize an object using a variable number of arbitrarily typed arguments. The function avoids the need for multiple constructors providing all possible combintations of configurable parameters.

IsolatedInitialize() does not call Initialize() on attached transformations. If initialization should be propagated, then use the Initialize() function.

If a derived class does not override IsolatedInitialize(), then the base class throws NotImplemented.

Reimplemented in SourceTemplate< T >, SourceTemplate< FileStore >, SourceTemplate< RandomNumberStore >, SourceTemplate< StringStore >, ArraySink, RandomNumberSink, StringSinkTemplate< T >, SignerFilter, AuthenticatedEncryptionFilter, HashFilter, FilterWithInputQueue, BitBucket, FilterWithBufferedInput, Store, MeterFilter, CustomSignalPropagation< Sink >, PaddingRemover, FileSink, InformationRecovery, Base64URLDecoder, Grouper, InformationDispersal, Base64URLEncoder, Deflator, Inflator, ChannelSwitch, SecretRecovery, ByteQueue::Walker, Base32Decoder, BaseN_Decoder, Base64Decoder, SecretSharing, Base32Encoder, Base64Encoder, BaseN_Encoder, HexDecoder, ByteQueue, RawIDA, HexEncoder, and MessageQueue.

Definition at line 1503 of file cryptlib.h.

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virtual bool BufferedTransformation::IsolatedMessageSeriesEnd ( bool blocking )

inlinevirtual

Marks the end of a series of messages, without signal propagation.

Parameters

blocking specifies whether the object should block when completing the processing on the current series of messages

Reimplemented in MeterFilter, InputRejecting< BufferedTransformation >, InputRejecting< Filter >, and MessageQueue.

Definition at line 1517 of file cryptlib.h.

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lword BufferedTransformation::MaxRetrievable ( ) const

virtual

Provides the number of bytes ready for retrieval.

Returns: the number of bytes 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 NullStore, RandomNumberStore, ByteQueue::Walker, FileStore, MessageQueue, and ByteQueue.

Definition at line 496 of file cryptlib.cpp.

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bool BufferedTransformation::MessageEnd	(	int	propagation = `-1`,
		bool	blocking = `true`
	)

inline

Signals the end of messages to the object.

Parameters

propagation	the number of attached transformations the MessageEnd() signal should be passed
blocking	specifies whether the object should block when processing input

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Definition at line 1434 of file cryptlib.h.

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bool BufferedTransformation::MessageSeriesEnd	(	int	propagation = `-1`,
		bool	blocking = `true`
	)

virtual

Marks the end of a series of messages, with signal propagation.

Parameters

propagation	the number of attached transformations the MessageSeriesEnd() signal should be passed
blocking	specifies whether the object should block when processing input

Each object that receives the signal will perform its processing, decrement propagation, and then pass the signal on to attached transformations if the value is not 0.

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Note: There should be a MessageEnd() immediately before MessageSeriesEnd().

Reimplemented in OutputProxy, Redirector, Multichannel< Filter >, Multichannel< Sink >, and Filter.

Definition at line 449 of file cryptlib.cpp.

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unsigned int BufferedTransformation::NumberOfMessages ( ) const

virtual

Provides the number of meesages processed by this object.

Returns: the number of meesages processed by this object

NumberOfMessages returns number of times MessageEnd() has been received minus messages retrieved or skipped

Reimplemented in Store, and MessageQueue.

Definition at line 569 of file cryptlib.cpp.

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virtual unsigned int BufferedTransformation::NumberOfMessageSeries ( ) const

inlinevirtual

Provides the number of messages in a series.

Returns: the number of messages in this series

Reimplemented in MessageQueue.

Definition at line 1781 of file cryptlib.h.

virtual unsigned int BufferedTransformation::NumberOfMessagesInThisSeries ( ) const

inlinevirtual

Provides the number of messages in a series.

Returns: the number of messages in this series

Reimplemented in MessageQueue.

Definition at line 1778 of file cryptlib.h.

size_t BufferedTransformation::Peek ( byte & outByte ) const

virtual

Peek a 8-bit byte.

Parameters

outByte the 8-bit value to be retrieved

Returns: the number of bytes read during the call.

Peek does not remove bytes from the object. Use the return value of Get to detect short reads.

Reimplemented in ByteQueue::Walker, and ByteQueue.

Definition at line 534 of file cryptlib.cpp.

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size_t BufferedTransformation::Peek	(	byte *	outString,
		size_t	peekMax
	)		const

virtual

Peek a block of bytes.

Parameters

outString	a block of bytes
peekMax	the number of bytes to Peek

Returns: the number of bytes read during the call.

Peek does not remove bytes from the object. Use the return value of Get to detect short reads.

Reimplemented in ByteQueue::Walker, and ByteQueue.

Definition at line 542 of file cryptlib.cpp.

size_t BufferedTransformation::PeekWord16	(	word16 &	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`
	)		const

Peek a 16-bit word.

Parameters

value	the 16-bit value to be retrieved
order	the ByteOrder of the value to be processed.

Returns: the number of bytes consumed during the call.

Peek does not consume bytes in the stream. Use the return value of GetWord16 to detect short reads.

Definition at line 731 of file cryptlib.cpp.

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size_t BufferedTransformation::PeekWord32	(	word32 &	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`
	)		const

Peek a 32-bit word.

Parameters

value	the 32-bit value to be retrieved
order	the ByteOrder of the value to be processed.

Returns: the number of bytes consumed during the call.

Peek does not consume bytes in the stream. Use the return value of GetWord16 to detect short reads.

Definition at line 744 of file cryptlib.cpp.

size_t BufferedTransformation::Put	(	byte	inByte,
		bool	blocking = `true`
	)

inline

Input a byte for processing.

Parameters

inByte	the 8-bit byte (octet) to be processed.
blocking	specifies whether the object should block when processing input.

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Put(byte) calls Put(byte*, size_t).

Definition at line 1376 of file cryptlib.h.

size_t BufferedTransformation::Put	(	const byte *	inString,
		size_t	length,
		bool	blocking = `true`
	)

inline

Input a byte buffer for processing.

Parameters

inString	the byte buffer to process
length	the size of the string, in bytes
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Internally, Put() calls Put2().

Definition at line 1385 of file cryptlib.h.

virtual size_t BufferedTransformation::Put2	(	const byte *	inString,
		size_t	length,
		int	messageEnd,
		bool	blocking
	)

pure virtual

Input multiple bytes for processing.

Parameters

inString	the byte buffer to process
length	the size of the string, in bytes
messageEnd	means how many filters to signal MessageEnd() to, including this one
blocking	specifies whether the object should block when processing input

Derived classes must implement Put2().

Implemented in FilterTester, ArrayXorSink, ArraySink, RandomNumberSink, StringSinkTemplate< T >, OutputProxy, Redirector, PK_DefaultDecryptionFilter, PK_DefaultEncryptionFilter, SignerFilter, HashFilter, FilterWithInputQueue, BitBucket, FilterWithBufferedInput, MeterFilter, Multichannel< Filter >, Multichannel< Sink >, PaddingRemover, FileSink, InputRejecting< BufferedTransformation >, InputRejecting< Filter >, Grouper, InformationDispersal, Deflator, Inflator, MaurerRandomnessTest, BaseN_Decoder, SecretSharing, BaseN_Encoder, ByteQueue, and MessageQueue.

size_t BufferedTransformation::PutMessageEnd	(	const byte *	inString,
		size_t	length,
		int	propagation = `-1`,
		bool	blocking = `true`
	)

inline

Input multiple bytes for processing and signal the end of a message.

Parameters

inString	the byte buffer to process
length	the size of the string, in bytes
propagation	the number of attached transformations the MessageEnd() signal should be passed
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Internally, PutMessageEnd() calls Put2() with a modified propagation to ensure all attached transformations finish processing the message.

propagation count includes this object. Setting propagation to 1 means this object only. Setting propagation to -1 means unlimited propagation.

Definition at line 1447 of file cryptlib.h.

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size_t BufferedTransformation::PutModifiable	(	byte *	inString,
		size_t	length,
		bool	blocking = `true`
	)

inline

Input multiple bytes that may be modified by callee.

Parameters

inString	the byte buffer to process
length	the size of the string, in bytes
blocking	specifies whether the object should block when processing input

Returns: 0 indicates all bytes were processed during the call. Non-0 indicates the number of bytes that were not processed

Definition at line 1426 of file cryptlib.h.

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virtual size_t BufferedTransformation::PutModifiable2	(	byte *	inString,
		size_t	length,
		int	messageEnd,
		bool	blocking
	)

inlinevirtual

Input multiple bytes that may be modified by callee.

Parameters

inString	the byte buffer to process.
length	the size of the string, in bytes.
messageEnd	means how many filters to signal MessageEnd() to, including this one.
blocking	specifies whether the object should block when processing input.

Internally, PutModifiable2() calls Put2().

Reimplemented in OutputProxy, FilterWithBufferedInput, MeterFilter, Multichannel< Filter >, and Multichannel< Sink >.

Definition at line 1464 of file cryptlib.h.

size_t BufferedTransformation::PutWord16	(	word16	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`,
		bool	blocking = `true`
	)

Input a 16-bit word for processing.

Parameters

value	the 16-bit value to be processed
order	the ByteOrder of the value to be processed.
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Definition at line 714 of file cryptlib.cpp.

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size_t BufferedTransformation::PutWord32	(	word32	value,
		ByteOrder	order = `BIG_ENDIAN_ORDER`,
		bool	blocking = `true`
	)

Input a 32-bit word for processing.

Parameters

value	the 32-bit value to be processed.
order	the ByteOrder of the value to be processed.
blocking	specifies whether the object should block when processing input.

Returns: the number of bytes that remain in the block (i.e., bytes not processed)

Definition at line 719 of file cryptlib.cpp.

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BufferedTransformation& BufferedTransformation::Ref ( )

inline

Provides a reference to this object.

Returns: A reference to this object

Useful for passing a temporary object to a function that takes a non-const reference

Definition at line 1366 of file cryptlib.h.

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virtual void BufferedTransformation::SetAutoSignalPropagation ( int propagation )

inlinevirtual

Set propagation of automatically generated and transferred signals.

Parameters

propagation then new value

Setting propagation to 0 means do not automatically generate signals. Setting propagation to -1 means unlimited propagation.

Reimplemented in SourceTemplate< T >, SourceTemplate< FileStore >, SourceTemplate< RandomNumberStore >, SourceTemplate< StringStore >, AutoSignaling< BufferedTransformation >, AutoSignaling< InputRejecting< BufferedTransformation > >, AutoSignaling< Filter >, and AutoSignaling< Unflushable< Multichannel< Filter > > >.

Definition at line 1560 of file cryptlib.h.

void BufferedTransformation::SetRetrievalChannel ( const std::string & channel )

virtual

Sets the default retrieval channel.

Parameters

channel the channel to signal the end of a series of messages

Note: this function may not be implemented in all objects that should support it.

Definition at line 696 of file cryptlib.cpp.

lword BufferedTransformation::Skip ( lword skipMax = LWORD_MAX )

virtual

Discard skipMax bytes from the output buffer.

Parameters

skipMax the number of bytes to discard

Skip() discards bytes from the output buffer, which is the AttachedTransformation(), if present. The function always returns the parameter skipMax.

If you want to skip bytes from a Source, then perform the following.

    StringSource ss(str, false, new Redirector(TheBitBucket()));
    ss.Pump(10);    // Skip 10 bytes from Source
    ss.Detach(new FilterChain(...));
    ss.PumpAll();

Reimplemented in FileStore.

Definition at line 553 of file cryptlib.cpp.

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void BufferedTransformation::SkipAll ( )

virtual

Skip all messages in the series.

Definition at line 642 of file cryptlib.cpp.

unsigned int BufferedTransformation::SkipMessages ( unsigned int count = UINT_MAX )

virtual

Skip a number of meessages.

Returns: 0 if the requested number of messages was skipped, non-0 otherwise

SkipMessages() skips count number of messages. If there is an AttachedTransformation() then SkipMessages() is called on the attached transformation. If there is no attached transformation, then count number of messages are sent to TheBitBucket() using TransferMessagesTo().

Definition at line 596 of file cryptlib.cpp.

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lword BufferedTransformation::TotalBytesRetrievable ( ) const

virtual

Provides the number of bytes ready for retrieval.

Returns: the number of bytes ready for retrieval

Reimplemented in MessageQueue.

Definition at line 561 of file cryptlib.cpp.

void BufferedTransformation::TransferAllTo	(	BufferedTransformation &	target,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)

inline

Transfer all bytes from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
channel	the channel on which the transfer should occur

Returns: the number of bytes that remain in the current transfer block (i.e., bytes not transferred)

TransferMessagesTo2() removes messages from this object and moves them to the destination. Internally TransferAllTo() calls TransferAllTo2().

Definition at line 1763 of file cryptlib.h.

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size_t BufferedTransformation::TransferAllTo2	(	BufferedTransformation &	target,
		const std::string &	channel = `DEFAULT_CHANNEL`,
		bool	blocking = `true`
	)

Transfer all bytes from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
channel	the channel on which the transfer should occur
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the current transfer block (i.e., bytes not transferred)

TransferMessagesTo2() removes messages from this object and moves them to the destination.

Definition at line 653 of file cryptlib.cpp.

unsigned int BufferedTransformation::TransferMessagesTo	(	BufferedTransformation &	target,
		unsigned int	count = `UINT_MAX`,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)

inline

Transfer messages from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
count	the number of messages to transfer
channel	the channel on which the transfer should occur

Returns: the number of bytes that remain in the current transfer block (i.e., bytes not transferred)

TransferMessagesTo2() removes messages from this object and moves them to the destination. If all bytes are not transferred for a message, then processing stops and the number of remaining bytes is returned. TransferMessagesTo() does not proceed to the next message.

A return value of 0 indicates all messages were successfully transferred.

Definition at line 1740 of file cryptlib.h.

size_t BufferedTransformation::TransferMessagesTo2	(	BufferedTransformation &	target,
		unsigned int &	messageCount,
		const std::string &	channel = `DEFAULT_CHANNEL`,
		bool	blocking = `true`
	)

Transfer messages from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
messageCount	the number of messages to transfer
channel	the channel on which the transfer should occur
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the current transfer block (i.e., bytes not transferred)

TransferMessagesTo2() removes messages from this object and moves them to the destination.

messageCount is an IN and OUT parameter. When the call is made, messageCount is the the number of messages requested to be transferred. When the call returns, messageCount is the number of messages actually transferred.

Definition at line 604 of file cryptlib.cpp.

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lword BufferedTransformation::TransferTo	(	BufferedTransformation &	target,
		lword	transferMax = `LWORD_MAX`,
		const std::string &	channel = `DEFAULT_CHANNEL`
	)

inline

move transferMax bytes of the buffered output to target as input

Transfer bytes from this object to another BufferedTransformation

Parameters

target	the destination BufferedTransformation
transferMax	the number of bytes to transfer
channel	the channel on which the transfer should occur

Returns: the number of bytes transferred during the call.

TransferTo removes bytes from this object and moves them to the destination.

The function always returns transferMax. If an accurate count is needed, then use TransferTo2.

Definition at line 1654 of file cryptlib.h.

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virtual size_t BufferedTransformation::TransferTo2	(	BufferedTransformation &	target,
		lword &	byteCount,
		const std::string &	channel = `DEFAULT_CHANNEL`,
		bool	blocking = `true`
	)

pure virtual

Transfer bytes from this object to another BufferedTransformation.

Parameters

target	the destination BufferedTransformation
byteCount	the number of bytes to transfer
channel	the channel on which the transfer should occur
blocking	specifies whether the object should block when processing input

Returns: the number of bytes that remain in the transfer block (i.e., bytes not transferred)

TransferTo() removes bytes from this object and moves them to the destination. Transfer begins at the index position in the current stream, and not from an absolute position in the stream.

byteCount is an IN and OUT parameter. When the call is made, byteCount is the requested size of the transfer. When the call returns, byteCount is the number of bytes that were transferred.

Implemented in NullStore, RandomNumberStore, StringStore, Sink, BERGeneralDecoder, ByteQueue::Walker, Filter, FileStore, ByteQueue, and MessageQueue.

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Member Data Documentation

byte BufferedTransformation::m_buf[4]

private

Definition at line 2033 of file cryptlib.h.

const std::string & BufferedTransformation::NULL_CHANNEL = DEFAULT_CHANNEL

static

Definition at line 1356 of file cryptlib.h.

The documentation for this class was generated from the following files:

src/cryptopp/cryptlib.h
src/cryptopp/cryptlib.cpp

Classes

Public Member Functions

Static Public Attributes

Static Protected Member Functions

Private Attributes

INPUT

WAITING

SIGNALS

RETRIEVAL OF ONE MESSAGE

RETRIEVAL OF MULTIPLE MESSAGES

NON-BLOCKING TRANSFER OF OUTPUT

CHANNELS

ATTACHMENT

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation