Provide operations for reading primitive data values, byte arrays, strings, Serializable objects from a byte stream. More...

#include <DataInput.hpp>

Public Member Functions
void	advanceCursor (size_t offset)
	advance the cursor by given offset

const uint8_t *	currentBufferPosition () const
	Get the pointer to current buffer position.

size_t	getBytesRead () const
	get the number of bytes read in the buffer

size_t	getBytesRemaining () const
	get the number of bytes remaining to be read in the buffer

int8_t	read ()
	Read a signed byte from the `DataInput`.

int32_t	readArrayLength ()
	Read a 32-bit signed integer array length value from the `DataInput` in a manner compatible with java server's `DataSerializer.readArrayLength`.

bool	readBoolean ()
	Read a boolean value from the `DataInput`.

void	readBytes (int8_t *bytes, int32_t len)
	Read an array of signed bytes from the `DataInput` expecting to find the length of array in the stream at the start.

void	readBytes (uint8_t *bytes, int32_t len)
	Read an array of unsigned bytes from the `DataInput` expecting to find the length of array in the stream at the start.

void	readBytesOnly (int8_t *buffer, size_t len)
	Read the given number of signed bytes from the `DataInput`.

void	readBytesOnly (uint8_t *buffer, size_t len)
	Read the given number of unsigned bytes from the `DataInput`.

double	readDouble ()
	Read a double precision number from the `DataInput`.

float	readFloat ()
	Read a float from the `DataInput`.

int16_t	readInt16 ()
	Read a 16-bit signed integer from the `DataInput`.

int32_t	readInt32 ()
	Read a 32-bit signed integer from the `DataInput`.g.

int64_t	readInt64 ()
	Read a 64-bit signed integer from the `DataInput`.

std::shared_ptr< Serializable >	readObject ()
	Read a Serializable object from the DataInput.

void	readObject (std::shared_ptr< Serializable > &ptr)
	Read a `Serializable` object from the `DataInput`.

int64_t	readUnsignedVL ()
	Decode a 64 bit integer as a variable length array.

void	reset ()
	reset the cursor to the start of buffer

void	rewindCursor (size_t offset)
	rewind the cursor by given offset

Protected Member Functions
	DataInput (const uint8_t buffer, size_t len, const CacheImpl cache, Pool *pool)
	constructor given a pre-allocated byte array with size

Detailed Description

Provide operations for reading primitive data values, byte arrays, strings, Serializable objects from a byte stream.

This class is intentionally not thread safe.

Remarks: None of the output parameters in the methods below can be nullptr unless otherwise noted.

Constructor & Destructor Documentation

◆ DataInput()

apache::geode::client::DataInput::DataInput	(	const uint8_t *	buffer,
		size_t	len,
		const CacheImpl *	cache,
		Pool *	pool
	)

protected

constructor given a pre-allocated byte array with size

Member Function Documentation

◆ advanceCursor()

void apache::geode::client::DataInput::advanceCursor ( size_t offset )

inline

advance the cursor by given offset

◆ currentBufferPosition()

const uint8_t * apache::geode::client::DataInput::currentBufferPosition ( ) const

inline

Get the pointer to current buffer position.

This should be treated as readonly and modification of contents using this internal pointer has undefined behavior.

◆ getBytesRead()

size_t apache::geode::client::DataInput::getBytesRead ( ) const

inline

get the number of bytes read in the buffer

◆ getBytesRemaining()

size_t apache::geode::client::DataInput::getBytesRemaining ( ) const

inline

get the number of bytes remaining to be read in the buffer

◆ read()

int8_t apache::geode::client::DataInput::read ( )

inline

Read a signed byte from the DataInput.

@return signed byte read from stream

◆ readArrayLength()

int32_t apache::geode::client::DataInput::readArrayLength ( )

inline

Read a 32-bit signed integer array length value from the DataInput in a manner compatible with java server's DataSerializer.readArrayLength.

◆ readBoolean()

bool apache::geode::client::DataInput::readBoolean ( )

inline

Read a boolean value from the DataInput.

◆ readBytes() [1/2]

void apache::geode::client::DataInput::readBytes	(	int8_t **	bytes,
		int32_t *	len
	)

inline

Read an array of signed bytes from the DataInput expecting to find the length of array in the stream at the start.

Remarks: This method is complimentary to DataOutput::writeBytes.

Parameters

bytes	output array to hold the bytes read from stream; the array is allocated by this method
len	output parameter to hold the length of array read from stream

◆ readBytes() [2/2]

void apache::geode::client::DataInput::readBytes	(	uint8_t **	bytes,
		int32_t *	len
	)

inline

Read an array of unsigned bytes from the DataInput expecting to find the length of array in the stream at the start.

Remarks: This method is complimentary to DataOutput::writeBytes.

Parameters

bytes	output array to hold the bytes read from stream; the array is allocated by this method
len	output parameter to hold the length of array read from stream

◆ readBytesOnly() [1/2]

void apache::geode::client::DataInput::readBytesOnly	(	int8_t *	buffer,
		size_t	len
	)

inline

Read the given number of signed bytes from the DataInput.

Remarks: This method is complimentary to DataOutput::writeBytesOnly and, unlike readBytes, does not expect the length of array in the stream.

Parameters

buffer	array to hold the bytes read from stream
len	number of signed bytes to be read

◆ readBytesOnly() [2/2]

void apache::geode::client::DataInput::readBytesOnly	(	uint8_t *	buffer,
		size_t	len
	)

inline

Read the given number of unsigned bytes from the DataInput.

Remarks: This method is complimentary to DataOutput::writeBytesOnly and, unlike readBytes, does not expect the length of array in the stream.

Parameters

buffer	array to hold the bytes read from stream
len	number of unsigned bytes to be read

◆ readDouble()

double apache::geode::client::DataInput::readDouble ( )

inline

Read a double precision number from the DataInput.

◆ readFloat()

float apache::geode::client::DataInput::readFloat ( )

inline

Read a float from the DataInput.

◆ readInt16()

int16_t apache::geode::client::DataInput::readInt16 ( )

inline

Read a 16-bit signed integer from the DataInput.

Returns: 16-bit signed integer read from stream

◆ readInt32()

int32_t apache::geode::client::DataInput::readInt32 ( )

inline

Read a 32-bit signed integer from the DataInput.g.

◆ readInt64()

int64_t apache::geode::client::DataInput::readInt64 ( )

inline

Read a 64-bit signed integer from the DataInput.

◆ readObject() [1/2]

std::shared_ptr< Serializable > apache::geode::client::DataInput::readObject ( )

inline

Read a Serializable object from the DataInput.

Returns: Serializable object or nullptr.

◆ readObject() [2/2]

void apache::geode::client::DataInput::readObject ( std::shared_ptr< Serializable > & ptr )

inline

Read a Serializable object from the DataInput.

Null objects are handled.

◆ readUnsignedVL()

int64_t apache::geode::client::DataInput::readUnsignedVL ( )

inline

Decode a 64 bit integer as a variable length array.

This is taken from the varint encoding in protobufs (BSD licensed). See https://developers.google.com/protocol-buffers/docs/encoding

◆ reset()

void apache::geode::client::DataInput::reset ( )

inline

reset the cursor to the start of buffer

◆ rewindCursor()

void apache::geode::client::DataInput::rewindCursor ( size_t offset )

inline

rewind the cursor by given offset

VMware GemFire Native Client C++ API Reference

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ DataInput()

Member Function Documentation

◆ advanceCursor()

◆ currentBufferPosition()

◆ getBytesRead()

◆ getBytesRemaining()

◆ read()

◆ readArrayLength()

◆ readBoolean()

◆ readBytes() [1/2]

◆ readBytes() [2/2]

◆ readBytesOnly() [1/2]

◆ readBytesOnly() [2/2]

◆ readDouble()

◆ readFloat()

◆ readInt16()

◆ readInt32()

◆ readInt64()

◆ readObject() [1/2]

◆ readObject() [2/2]

◆ readUnsignedVL()

◆ reset()

◆ rewindCursor()