EmbData Class Reference

#include <EmbData.h>

List of all members.

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
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
unsigned long	NumBitsNeeded
	exactly the number of bits that the next step will consume from Reservoir and addBits together
BitString	Reservoir
std::string	Passphrase
unsigned short	Version
	version read from input bitstring
EncryptionAlgorithm	EncAlgo
EncryptionMode	EncMode
int	Compression
	compression level: 0(none),1(best speed),...,9(best compression)
bool	Checksum
	will a checksum be embedded ?
unsigned long	CRC32
	the checksum
std::string	FileName
std::vector< BYTE >	Data
	contains the actual message to be embedded
Static Private Attributes
static const unsigned int	NBitsNPlainBits = 32
	number of bits used to code the number of plain bits
static const unsigned int	NBitsNUncompressedBits = 32
	number of bits used to code the number of uncompressed bits
static const unsigned int	NBitsCrc32 = 32
	size of a crc32 checksum in bits
static const unsigned short	CodeVersion = 0
	version of this steghide embedding (stego compatibility of EmbData)
static const UWORD32	Magic = 0x73688DUL
	steghide magic to recognize embedded data (the string "shm")
static const unsigned int	NBitsMagic = 24
	size (in bits of Magic)

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Member Enumeration Documentation

enum EmbData::MODE

Enumerator: EMBED  EXTRACT

enum EmbData::STATE

Enumerator: READ_MAGIC  READ_VERSION  READ_ENCINFO  READ_NPLAINBITS  READ_ENCRYPTED  END

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Constructor & Destructor Documentation

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)

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Member Function Documentation

void EmbData::addBits (  BitString  addbits  )

bool EmbData::checksumOK (  void   )  const

check if crc32 checksum is ok (needs filled Data and CRC32 fields) Returns: true iff checksum is ok

bool EmbData::finished (  void   )

BitString EmbData::getBitString (  void   )

bool EmbData::getChecksum (  void   )  const

int EmbData::getCompression (  void   )  const

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

EncryptionAlgorithm EmbData::getEncAlgo (  void   )  const

EncryptionMode EmbData::getEncMode (  void   )  const

std::string EmbData::getFileName (  void   )  const [inline]

unsigned long EmbData::getNumBitsRequested (  void   )

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

void EmbData::setChecksum (  bool  c  )

void EmbData::setCompression (  int  c  )

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

void EmbData::setEncAlgo (  EncryptionAlgorithm  a  )

void EmbData::setEncMode (  EncryptionMode  m  )

std::string EmbData::stripDir (  std::string  s  )  [protected]

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Member Data Documentation

bool EmbData::Checksum [private]

const unsigned short EmbData::CodeVersion = 0 [static, private]

int EmbData::Compression [private]

unsigned long EmbData::CRC32 [private]

std::vector<BYTE> EmbData::Data [private]

EncryptionAlgorithm EmbData::EncAlgo [private]

EncryptionMode EmbData::EncMode [private]

std::string EmbData::FileName [private]

const UWORD32 EmbData::Magic = 0x73688DUL [static, private]

const unsigned int EmbData::MinStegoHeaderSize = 50 [static]

MODE EmbData::Mode [private]

const unsigned int EmbData::NBitsCrc32 = 32 [static, private]

const unsigned int EmbData::NBitsMagic = 24 [static, private]

const unsigned int EmbData::NBitsNPlainBits = 32 [static, private]

const unsigned int EmbData::NBitsNUncompressedBits = 32 [static, private]

unsigned long EmbData::NPlainBits [private]

unsigned long EmbData::NumBitsNeeded [private]

unsigned long EmbData::NumBitsRequested [private]

std::string EmbData::Passphrase [private]

BitString EmbData::Reservoir [private]

STATE EmbData::State [private]

unsigned short EmbData::Version [private]

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

• EmbData.h
• EmbData.cc

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