Class for encoding and decoding binary data using an algorithm described in RFC 4648. More...

#include <encode.h>

Inheritance diagram for isc::util::encode::BaseNEncoder:

Public Member Functions
	BaseNEncoder (const std::string &algorithm, const char *digit_set, const std::vector< uint8_t > &bits_table, size_t bits_per_digit, size_t digits_per_group, const char pad_char, size_t max_pad, bool case_sensitive)
	Constructor.

virtual	~BaseNEncoder ()=default
	Destructor.

char	bitsToDigit (uint8_t bits)
	Translate a byte of binary data into the appropriate algorithm digit.

void	decode (const std::string &encoded_str, std::vector< uint8_t > &output)
	Decodes an encoded string using the encoder's algorithm.

uint8_t	digitToBits (uint8_t digit)
	Translate a digit into the appropriate algorithm bit value.

std::string	encode (const std::vector< uint8_t > &input)
	Encodes binary data using the encoder's algorithm.

std::string	getAlgorithm () const
	Get the algorithm name.

size_t	getBitsPerDigit ()
	Get the number of data bits represented by a digit.

const std::vector< uint8_t > &	getBitsTable () const
	Get the digit lookup table.

const char *	getDigitSet () const
	Get the digit set.

size_t	getDigitsPerGroup () const
	Get the number of digits contained in a group.

size_t	getMaxBitsToDigit ()
	Get the maxium index value of the digit set.

size_t	getMaxDigitToBits ()
	Get the maxium index value of the algorithm bit table.

size_t	getMaxPad ()
	Get the maximum number of pad characters in a group.

uint8_t	getPadChar () const
	Get the character used for padding out to group size (0 means no padding)

bool	isCaseSensitive ()
	Indicates whether or not the algorithm's digit set is case-sensitive.

Protected Attributes
std::string	algorithm_
	Name of the algorithm, used for logging.

size_t	bits_per_digit_
	Number of data bits represented by a digit.

std::vector< uint8_t >	bits_table_
	Table to translate digits to data used during decoding.

bool	case_sensitive_
	Indicates whether or not the algorithm's digit set is case-sensitive.

const char *	digit_set_
	Set of digits (i.e. alphabet) used for encoding.

size_t	digits_per_group_
	Number of digits contained in a group.

size_t	max_bits_to_digit_
	Maxium index value of the digit set.

size_t	max_digit_to_bits_
	Maxium index value of the algorithm bit table.

size_t	max_pad_
	Maximum number of pad characters in a group.

const char	pad_char_
	Character used for padding out to group size (0 means no padding)

Detailed Description

Class for encoding and decoding binary data using an algorithm described in RFC 4648.

Definition at line 20 of file encode.h.

Constructor & Destructor Documentation

◆ BaseNEncoder()

isc::util::encode::BaseNEncoder::BaseNEncoder	(	const std::string &	algorithm,
		const char *	digit_set,
		const std::vector< uint8_t > &	bits_table,
		size_t	bits_per_digit,
		size_t	digits_per_group,
		const char	pad_char,
		size_t	max_pad,
		bool	case_sensitive )

Constructor.

Parameters

algorithm	name of the algorithm, used for logging
digit_set	set of digits (i.e. alphabet) used for encoding
bits_table	table to translate digits to data used during decoding
bits_per_digit	number of data bits represented by a digit
digits_per_group	number of digits contained in a group
pad_char	character used for padding out to group size (0 means no padding)
max_pad	maximum number of pad characters in a group
case_sensitive	indicates if the algorithm's digit set is case sensitive

Definition at line 26 of file encode.cc.

◆ ~BaseNEncoder()

virtual isc::util::encode::BaseNEncoder::~BaseNEncoder ( )

virtualdefault

Destructor.

References encode().

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Member Function Documentation

◆ bitsToDigit()

char isc::util::encode::BaseNEncoder::bitsToDigit ( uint8_t bits )

Translate a byte of binary data into the appropriate algorithm digit.

Parameters

bits	binary value to translate

Returns: char containing the digit corresponding to the binary value

Exceptions

BadValue if the bits value is out of range

Definition at line 47 of file encode.cc.

References algorithm_, digit_set_, isc_throw, and max_bits_to_digit_.

Referenced by encode().

◆ decode()

void isc::util::encode::BaseNEncoder::decode	(	const std::string &	encoded_str,
		std::vector< uint8_t > &	output )

Decodes an encoded string using the encoder's algorithm.

Parameters

	encoded_str	encoded string to decode
[out]	output	vector into which the decoded data is stored

Exceptions

BadValue if an error occurs during decoding

Definition at line 150 of file encode.cc.

References algorithm_, bits_per_digit_, digits_per_group_, digitToBits(), isc_throw, max_pad_, and pad_char_.

Referenced by isc::util::encode::decodeBase32Hex(), isc::util::encode::decodeBase64(), and isc::util::encode::decodeHex().

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◆ digitToBits()

uint8_t isc::util::encode::BaseNEncoder::digitToBits ( uint8_t digit )

Translate a digit into the appropriate algorithm bit value.

Function maps all 256 ASCII chars to their corresponding algorithm-specific data value. A data value of 0xee marks a char as whitespace, 0xff marks a char is invalid.

Parameters

digit the algorithm digit to translate

Returns: byte containing the binary value corresponding to the digit

Definition at line 57 of file encode.cc.

References algorithm_, bits_table_, isc_throw, and max_digit_to_bits_.

Referenced by decode().

◆ encode()

std::string isc::util::encode::BaseNEncoder::encode ( const std::vector< uint8_t > & input )

Encodes binary data using the encoder's algorithm.

Parameters

input binary data to encode

Returns: resultant encoded data string

Exceptions

BadValue if an error occurs during encoding

Definition at line 67 of file encode.cc.

References bits_per_digit_, bitsToDigit(), digits_per_group_, and pad_char_.

Referenced by ~BaseNEncoder().

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◆ getAlgorithm()

std::string isc::util::encode::BaseNEncoder::getAlgorithm ( ) const

inline

Get the algorithm name.

Returns: string containing the algorithm name

Definition at line 85 of file encode.h.

References algorithm_.

◆ getBitsPerDigit()

size_t isc::util::encode::BaseNEncoder::getBitsPerDigit ( )

inline

Get the number of data bits represented by a digit.

Returns: number of data bits per digit

Definition at line 106 of file encode.h.

References bits_per_digit_.

◆ getBitsTable()

const std::vector< uint8_t > & isc::util::encode::BaseNEncoder::getBitsTable ( ) const

inline

Get the digit lookup table.

Returns: vector containing the lookup table

Definition at line 99 of file encode.h.

References bits_table_.

◆ getDigitSet()

const char * isc::util::encode::BaseNEncoder::getDigitSet ( ) const

inline

Get the digit set.

Returns: string containing the set of digits

Definition at line 92 of file encode.h.

References digit_set_.

◆ getDigitsPerGroup()

size_t isc::util::encode::BaseNEncoder::getDigitsPerGroup ( ) const

inline

Get the number of digits contained in a group.

Returns: number of digits per group

Definition at line 113 of file encode.h.

References digits_per_group_.

◆ getMaxBitsToDigit()

size_t isc::util::encode::BaseNEncoder::getMaxBitsToDigit ( )

inline

Get the maxium index value of the digit set.

Returns: Maxium index value of the digit set

Definition at line 134 of file encode.h.

References max_bits_to_digit_.

◆ getMaxDigitToBits()

size_t isc::util::encode::BaseNEncoder::getMaxDigitToBits ( )

inline

Get the maxium index value of the algorithm bit table.

Returns: Maxium index value of the algorithm bit table

Definition at line 141 of file encode.h.

References max_digit_to_bits_.

◆ getMaxPad()

size_t isc::util::encode::BaseNEncoder::getMaxPad ( )

inline

Get the maximum number of pad characters in a group.

Returns: Maximum number of pad characters

Definition at line 127 of file encode.h.

References max_pad_.

◆ getPadChar()

uint8_t isc::util::encode::BaseNEncoder::getPadChar ( ) const

inline

Get the character used for padding out to group size (0 means no padding)

Returns: Character used as a pad byte

Definition at line 120 of file encode.h.

References pad_char_.

◆ isCaseSensitive()

bool isc::util::encode::BaseNEncoder::isCaseSensitive ( )

inline

Indicates whether or not the algorithm's digit set is case-sensitive.

Returns: true if the digit set is case-sensitive, false otherwise

Definition at line 149 of file encode.h.

References case_sensitive_.

Member Data Documentation

◆ algorithm_

std::string isc::util::encode::BaseNEncoder::algorithm_

protected

Name of the algorithm, used for logging.

Definition at line 155 of file encode.h.

Referenced by bitsToDigit(), decode(), digitToBits(), and getAlgorithm().

◆ bits_per_digit_

size_t isc::util::encode::BaseNEncoder::bits_per_digit_

protected

Number of data bits represented by a digit.

Definition at line 168 of file encode.h.

Referenced by decode(), encode(), and getBitsPerDigit().

◆ bits_table_

std::vector<uint8_t> isc::util::encode::BaseNEncoder::bits_table_

protected

Table to translate digits to data used during decoding.

The table must map all 256 ASCII chars to their corresponding algorithm-specific data value. A data value of 0xee marks a char as whitespace, 0xff marks a char is invalid

Definition at line 165 of file encode.h.

Referenced by digitToBits(), and getBitsTable().

◆ case_sensitive_

bool isc::util::encode::BaseNEncoder::case_sensitive_

protected

Indicates whether or not the algorithm's digit set is case-sensitive.

Definition at line 180 of file encode.h.

Referenced by isCaseSensitive().

◆ digit_set_

const char* isc::util::encode::BaseNEncoder::digit_set_

protected

Set of digits (i.e. alphabet) used for encoding.

Definition at line 158 of file encode.h.

Referenced by bitsToDigit(), and getDigitSet().

◆ digits_per_group_

size_t isc::util::encode::BaseNEncoder::digits_per_group_

protected

Number of digits contained in a group.

Definition at line 171 of file encode.h.

Referenced by decode(), encode(), and getDigitsPerGroup().

◆ max_bits_to_digit_

size_t isc::util::encode::BaseNEncoder::max_bits_to_digit_

protected

Maxium index value of the digit set.

Definition at line 183 of file encode.h.

Referenced by bitsToDigit(), and getMaxBitsToDigit().

◆ max_digit_to_bits_

size_t isc::util::encode::BaseNEncoder::max_digit_to_bits_

protected

Maxium index value of the algorithm bit table.

Definition at line 186 of file encode.h.

Referenced by digitToBits(), and getMaxDigitToBits().

◆ max_pad_

size_t isc::util::encode::BaseNEncoder::max_pad_

protected

Maximum number of pad characters in a group.

Definition at line 177 of file encode.h.

Referenced by decode(), and getMaxPad().

◆ pad_char_

const char isc::util::encode::BaseNEncoder::pad_char_

protected

Character used for padding out to group size (0 means no padding)

Definition at line 174 of file encode.h.

Referenced by decode(), encode(), and getPadChar().

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

Public Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ BaseNEncoder()

◆ ~BaseNEncoder()

Member Function Documentation

◆ bitsToDigit()

◆ decode()

◆ digitToBits()

◆ encode()

◆ getAlgorithm()

◆ getBitsPerDigit()

◆ getBitsTable()

◆ getDigitSet()

◆ getDigitsPerGroup()

◆ getMaxBitsToDigit()

◆ getMaxDigitToBits()

◆ getMaxPad()

◆ getPadChar()

◆ isCaseSensitive()

Member Data Documentation

◆ algorithm_

◆ bits_per_digit_

◆ bits_table_

◆ case_sensitive_

◆ digit_set_

◆ digits_per_group_

◆ max_bits_to_digit_

◆ max_digit_to_bits_

◆ max_pad_

◆ pad_char_