ByteBufferDataReader Class Reference

A DataReader which reads data from a ByteBuffer. More...

#include <ByteBufferDataReader.h++>

Inheritance diagram for ByteBufferDataReader:

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Collaboration diagram for ByteBufferDataReader:

[legend]

List of all members.

Public Member Functions
	ByteBufferDataReader (ByteBuffer &buffer)
	Construct a new ByteBufferDataReader for the given ByteBuffer.
	~ByteBufferDataReader () throw ()
	Destructor.
void	skip (size_t count) throw (IOException)
	Skip past the given number of bytes in the data stream.
void	reset () throw (IOException)
	Reset the encoder.
void	setOffset (int64_t offset) throw (IOException)
	Set the current reading/writing offset.
DataReader &	operator>> (bool &v) throw (IOException)
	Read operator.
DataReader &	operator>> (byte_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (byte_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (char &v) throw (IOException)
	Read operator.
DataReader &	operator>> (char *v) throw (IOException)
	Read operator.
DataReader &	operator>> (int16_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (int16_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (uint16_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (uint16_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (int32_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (int32_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (uint32_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (uint32_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (int64_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (int64_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (uint64_t &v) throw (IOException)
	Read operator.
DataReader &	operator>> (uint64_t *v) throw (IOException)
	Read operator.
DataReader &	operator>> (float &v) throw (IOException)
	Read operator.
DataReader &	operator>> (float *v) throw (IOException)
	Read operator.
DataReader &	operator>> (double &v) throw (IOException)
	Read operator.
DataReader &	operator>> (double *v) throw (IOException)
	Read operator.
DataReader &	operator>> (Blob &v) throw (IOException)
	Read operator.
DataReader &	operator>> (String &v) throw (IOException)
	Read operator.
DataReader &	operator>> (const Manipulator &manip) throw (IOException)
	Read operator.
void	pushContext ()
	Push a new encoder context.
void	popContext ()
	Pop the active encoder context.
bool	isTopContext () const throw ()
	Determine if the active context is the topmost (and only) context.
uint_t	getContextDepth () const throw ()
	Get the current context depth.
void	setEndianness (Endianness endianness) throw ()
	Specify the byte-endianness for reading/writing primitive integer types in the active context.
Endianness	getEndianness () const throw ()
	Get the byte-endianness in the active context.
void	setLength (size_t length) throw ()
	Specify the length of String, Blob, and array values for subsequent reading/writing in the active context.
size_t	getLength () const throw ()
	Get the current length for string values.
void	setLimit (int64_t limit) throw (IOException)
	Specify the maximum number of bytes that can be read/written in the active context.
int64_t	getLimit () const throw ()
	Get the current limit.
void	setStringPadding (bool stringPadding) throw ()
	Enables or disable string padding in the active context.
bool	getStringPadding () const throw ()
	Get the current string padding status.
int64_t	getOffset () const throw ()
	Get the current encoding/decoding offset.
int64_t	getCumulativeOffset () const throw ()
	Get the cumulative reading/writing offset.
int64_t	getRemaining () const throw ()
	Get the number of bytes between the current offset and the limit, i.e., the number of bytes remaining to be read or written.
void	align (size_t size) throw (IOException)
	Skip past enough bytes to re-align the data stream at a specified boundary.
Protected Member Functions
size_t	read (byte_t *buf, size_t count) throw (IOException)
	Read raw data from the input source.
bool	isSameEndianness () const throw ()
	Test if the endianness of the encoder is the same as the endianness of the host system.
Context &	currentContext ()
	Get a reference to the current context.
const Context &	currentContext () const
	Get a reference to the current context.
void	checkRemaining (const Context &ctx, size_t count) const throw (IOException)
	Check if at least the given number of bytes are available to be read or written.
Protected Attributes
ContextStack *	_contexts
int64_t	_maxOffset

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Detailed Description

A DataReader which reads data from a ByteBuffer.

Author:

Mark Lindner

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Constructor & Destructor Documentation

ByteBufferDataReader

(

ByteBuffer &

buffer

)

Construct a new ByteBufferDataReader for the given ByteBuffer.

Parameters:

buffer

The buffer.

~ByteBufferDataReader

(

)

throw ()

Destructor.

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Member Function Documentation

void align

(

size_t

size

)

throw (IOException) [inherited]

Skip past enough bytes to re-align the data stream at a specified boundary.

When reading, the bytes are simply skipped over; when writing, the bytes are filled with NULs.

Parameters:

size

The alignment size. Typical values include 2, 4, or 8. Other values are allowed but are of limited usefulness.

Exceptions:

IOException

If an I/O error occurs.

void checkRemaining	(	const Context &	ctx,
		size_t	count
	)			const throw (IOException) [protected, inherited]

Check if at least the given number of bytes are available to be read or written.

Parameters:

	ctx	The context to check.
	count	The number of bytes.

Exceptions:

IOException

If there are not enough bytes remaining.

const DataEncoder::Context & currentContext

(

)

const [protected, inherited]

Get a reference to the current context.

DataEncoder::Context & currentContext

(

)

[protected, inherited]

Get a reference to the current context.

uint_t getContextDepth

(

)

const throw () [inherited]

Get the current context depth.

int64_t getCumulativeOffset

(

)

const throw () [inherited]

Get the cumulative reading/writing offset.

This is a sum of the offsets across all contexts.

Endianness getEndianness

(

)

const throw () [inherited]

Get the byte-endianness in the active context.

size_t getLength

(

)

const throw () [inherited]

Get the current length for string values.

int64_t getLimit

(

)

const throw () [inherited]

Get the current limit.

int64_t getOffset

(

)

const throw () [inherited]

Get the current encoding/decoding offset.

int64_t getRemaining

(

)

const throw () [inherited]

Get the number of bytes between the current offset and the limit, i.e., the number of bytes remaining to be read or written.

bool getStringPadding

(

)

const throw () [inherited]

Get the current string padding status.

bool isSameEndianness

(

)

const throw () [protected, inherited]

Test if the endianness of the encoder is the same as the endianness of the host system.

bool isTopContext

(

)

const throw () [inherited]

Determine if the active context is the topmost (and only) context.

DataReader & operator>>

(

const Manipulator &

manip

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

String &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

Blob &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

double *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

double &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

float *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

float &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

uint64_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

uint64_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

int64_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

int64_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

uint32_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

uint32_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

int32_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

int32_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

uint16_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

uint16_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

int16_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

int16_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

char *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

char &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

byte_t *

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

byte_t &

v

)

throw (IOException) [inherited]

Read operator.

DataReader & operator>>

(

bool &

v

)

throw (IOException) [inherited]

Read operator.

void popContext

(

)

[inherited]

Pop the active encoder context.

The previous context becomes the active context, and the offset in the current context is incremented by the offset of the popped context.

void pushContext

(

)

[inherited]

Push a new encoder context.

size_t read	(	byte_t *	buf,
		size_t	count
	)			throw (IOException) [protected, virtual]

Read raw data from the input source.

Implements DataReader.

void reset

(

)

throw (IOException) [virtual]

Reset the encoder.

Discards all but the topmost context, and resets the topmost context to default values.

Reimplemented from DataEncoder.

void setEndianness

(

Endianness

endianness

)

throw () [inherited]

Specify the byte-endianness for reading/writing primitive integer types in the active context.

void setLength

(

size_t

length

)

throw () [inherited]

Specify the length of String, Blob, and array values for subsequent reading/writing in the active context.

Depending on whether string padding is enabled or disabled, written strings will be padded with either space characters or NUL bytes, respectively.

void setLimit

(

int64_t

limit

)

throw (IOException) [inherited]

Specify the maximum number of bytes that can be read/written in the active context.

Attempts to read/write past this limit will raise an IOException.

void setOffset

(

int64_t

offset

)

throw (IOException) [virtual]

Set the current reading/writing offset.

Implements DataEncoder.

void setStringPadding

(

bool

stringPadding

)

throw () [inherited]

Enables or disable string padding in the active context.

When enabled, strings are padded with spaces during writing; otherwise they are padded with NUL bytes.

Parameters:

stringPadding

A flag indicating the type of padding; true for spaces, false for NUL bytes.

void skip

(

size_t

count

)

throw (IOException) [virtual]

Skip past the given number of bytes in the data stream.

When reading, the bytes are simply skipped over; when writing, the bytes are filled with NULs.

Parameters:

count

The number of bytes to skip.

Exceptions:

IOException

If an I/O error occurs.

Implements DataEncoder.

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Member Data Documentation

ContextStack* _contexts [protected, inherited]

int64_t _maxOffset [protected, inherited]

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

• ByteBufferDataReader.h++
• ByteBufferDataReader.c++