EmbData Class Reference

#include <EmbData.h>

Public Types
enum	MODE { EMBED, EXTRACT }
enum	STATE {   READ_MAGIC, READ_VERSION, READ_ENCINFO, READ_NPLAINBITS,   READ_ENCRYPTED, END }

Public Member Functions
	EmbData (MODE m, std::string pp, std::string fn="")
BitString	getBitString (void)
bool	finished (void)
unsigned long	getNumBitsRequested (void)
void	addBits (BitString addbits)
void	setEncAlgo (EncryptionAlgorithm a)
EncryptionAlgorithm	getEncAlgo (void) const
void	setEncMode (EncryptionMode m)
EncryptionMode	getEncMode (void) const
void	setCompression (int c)
int	getCompression (void) const
void	setChecksum (bool c)
bool	getChecksum (void) const
bool	checksumOK (void) const
void	setData (const std::vector< BYTE > data)
std::vector< BYTE >	getData (void) const
std::string	getFileName (void) const

Static Public Attributes
static const unsigned int	MinStegoHeaderSize = 50
	the minimum size of the part of the generatred BitString that is not the data More...

Protected Member Functions
std::string	stripDir (std::string s)

Private Attributes
MODE	Mode
STATE	State
unsigned long	NPlainBits
unsigned long	NumBitsRequested
	the number of bits that the caller must at least supply to addBits More...
unsigned long	NumBitsNeeded
	exactly the number of bits that the next step will consume from Reservoir and addBits together More...
BitString	Reservoir
std::string	Passphrase
unsigned short	Version
	version read from input bitstring More...
EncryptionAlgorithm	EncAlgo
EncryptionMode	EncMode
int	Compression
	compression level: 0(none),1(best speed),...,9(best compression) More...
bool	Checksum
	will a checksum be embedded ? More...
unsigned long	CRC32
	the checksum More...
std::string	FileName
std::vector< BYTE >	Data
	contains the actual message to be embedded More...

Static Private Attributes
static const unsigned int	NBitsNPlainBits = 32
	number of bits used to code the number of plain bits More...
static const unsigned int	NBitsNUncompressedBits = 32
	number of bits used to code the number of uncompressed bits More...
static const unsigned int	NBitsCrc32 = 32
	size of a crc32 checksum in bits More...
static const unsigned short	CodeVersion = 0
	version of this steghide embedding (stego compatibility of EmbData) More...
static const UWORD32	Magic = 0x73688DUL
	steghide magic to recognize embedded data (the string "shm") More...
static const unsigned int	NBitsMagic = 24
	size (in bits of Magic) More...

Member Enumeration Documentation

MODE

enum EmbData::MODE

Enumerator
EMBED
EXTRACT

STATE

enum EmbData::STATE

Enumerator
READ_MAGIC
READ_VERSION
READ_ENCINFO
READ_NPLAINBITS
READ_ENCRYPTED
END

Constructor & Destructor Documentation

EmbData()

EmbData::EmbData	(	MODE	m,
		std::string	pp,
		std::string	fn = ""
	)

construct a new EmbData object

Parameters

m	the mode (EMBED or EXTRACT)
pp	the passphrase
fn	the filename (only need for mode EMBED)

Member Function Documentation

addBits()

void EmbData::addBits

(

BitString

addbits

)

checksumOK()

bool EmbData::checksumOK

(

void

)

const

check if crc32 checksum is ok (needs filled Data and CRC32 fields)

Returns

true iff checksum is ok

finished()

bool EmbData::finished

(

void

)

getBitString()

BitString EmbData::getBitString

(

void

)

getChecksum()

bool EmbData::getChecksum

(

void

)

const

getCompression()

int EmbData::getCompression

(

void

)

const

getData()

std::vector<BYTE> EmbData::getData ( void  ) const

inline

getEncAlgo()

EncryptionAlgorithm EmbData::getEncAlgo

(

void

)

const

getEncMode()

EncryptionMode EmbData::getEncMode

(

void

)

const

getFileName()

std::string EmbData::getFileName ( void  ) const

inline

getNumBitsRequested()

unsigned long EmbData::getNumBitsRequested

(

void

)

get the minimum length of the BitString that is to be passed to addBits

setChecksum()

void EmbData::setChecksum

(

bool

c

)

setCompression()

void EmbData::setCompression

(

int

c

)

setData()

void EmbData::setData ( const std::vector< BYTE >  data )

inline

setEncAlgo()

void EmbData::setEncAlgo

(

EncryptionAlgorithm

a

)

setEncMode()

void EmbData::setEncMode

(

EncryptionMode

m

)

stripDir()

std::string EmbData::stripDir ( std::string  s )

protected

Member Data Documentation

Checksum

bool EmbData::Checksum

private

CodeVersion

const unsigned short EmbData::CodeVersion = 0

staticprivate

Compression

int EmbData::Compression

private

CRC32

unsigned long EmbData::CRC32

private

Data

std::vector<BYTE> EmbData::Data

private

EncAlgo

EncryptionAlgorithm EmbData::EncAlgo

private

EncMode

EncryptionMode EmbData::EncMode

private

FileName

std::string EmbData::FileName

private

Magic

const UWORD32 EmbData::Magic = 0x73688DUL

staticprivate

MinStegoHeaderSize

const unsigned int EmbData::MinStegoHeaderSize = 50

static

Mode

MODE EmbData::Mode

private

NBitsCrc32

const unsigned int EmbData::NBitsCrc32 = 32

staticprivate

NBitsMagic

const unsigned int EmbData::NBitsMagic = 24

staticprivate

NBitsNPlainBits

const unsigned int EmbData::NBitsNPlainBits = 32

staticprivate

NBitsNUncompressedBits

const unsigned int EmbData::NBitsNUncompressedBits = 32

staticprivate

NPlainBits

unsigned long EmbData::NPlainBits

private

NumBitsNeeded

unsigned long EmbData::NumBitsNeeded

private

NumBitsRequested

unsigned long EmbData::NumBitsRequested

private

Passphrase

std::string EmbData::Passphrase

private

Reservoir

BitString EmbData::Reservoir

private

State

STATE EmbData::State

private

Version

unsigned short EmbData::Version

private

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

• EmbData.h
• EmbData.cc