strencodings.h File Reference

#include <attributes.h>
#include <span.h>
#include <cstdint>
#include <iterator>
#include <string>
#include <vector>

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Macros
#define	ARRAYLEN(array)   (sizeof(array)/sizeof((array)[0]))
	Utilities for converting data from/to strings. More...

Enumerations
enum	SafeChars { SAFE_CHARS_DEFAULT, SAFE_CHARS_UA_COMMENT, SAFE_CHARS_FILENAME, SAFE_CHARS_URI }
	Used by SanitizeString() More...

Functions
std::string	SanitizeString (const std::string &str, int rule=SAFE_CHARS_DEFAULT)
	Remove unsafe chars. More...
std::vector< unsigned char >	ParseHex (const char *psz)
std::vector< unsigned char >	ParseHex (const std::string &str)
signed char	HexDigit (char c)
bool	IsHex (const std::string &str)
bool	IsHexNumber (const std::string &str)
	Return true if the string is a hex number, optionally prefixed with "0x". More...
std::vector< unsigned char >	DecodeBase64 (const char *p, bool *pf_invalid=nullptr)
std::string	DecodeBase64 (const std::string &str, bool *pf_invalid=nullptr)
std::string	EncodeBase64 (Span< const unsigned char > input)
std::string	EncodeBase64 (const std::string &str)
std::vector< unsigned char >	DecodeBase32 (const char *p, bool *pf_invalid=nullptr)
std::string	DecodeBase32 (const std::string &str, bool *pf_invalid=nullptr)
std::string	EncodeBase32 (Span< const unsigned char > input, bool pad=true)
	Base32 encode. More...
std::string	EncodeBase32 (const std::string &str, bool pad=true)
	Base32 encode. More...
void	SplitHostPort (std::string in, int &portOut, std::string &hostOut)
int64_t	atoi64 (const std::string &str)
int	atoi (const std::string &str)
constexpr bool	IsDigit (char c)
	Tests if the given character is a decimal digit. More...
constexpr bool	IsSpace (char c) noexcept
	Tests if the given character is a whitespace character. More...
NODISCARD bool	ParseInt32 (const std::string &str, int32_t *out)
	Convert string to signed 32-bit integer with strict parse error feedback. More...
NODISCARD bool	ParseInt64 (const std::string &str, int64_t *out)
	Convert string to signed 64-bit integer with strict parse error feedback. More...
NODISCARD bool	ParseUInt8 (const std::string &str, uint8_t *out)
	Convert decimal string to unsigned 8-bit integer with strict parse error feedback. More...
NODISCARD bool	ParseUInt32 (const std::string &str, uint32_t *out)
	Convert decimal string to unsigned 32-bit integer with strict parse error feedback. More...
NODISCARD bool	ParseUInt64 (const std::string &str, uint64_t *out)
	Convert decimal string to unsigned 64-bit integer with strict parse error feedback. More...
NODISCARD bool	ParseDouble (const std::string &str, double *out)
	Convert string to double with strict parse error feedback. More...
std::string	HexStr (const Span< const uint8_t > s)
	Convert a span of bytes to a lower-case hexadecimal string. More...
std::string	HexStr (const Span< const char > s)
std::string	FormatParagraph (const std::string &in, size_t width=79, size_t indent=0)
	Format a paragraph of text to a fixed width, adding spaces for indentation to any added line. More...
template<typename T >
bool	TimingResistantEqual (const T &a, const T &b)
	Timing-attack-resistant comparison. More...
NODISCARD bool	ParseFixedPoint (const std::string &val, int decimals, int64_t *amount_out)
	Parse number as fixed point according to JSON number syntax. More...
template<int frombits, int tobits, bool pad, typename O , typename I >
bool	ConvertBits (const O &outfn, I it, I end)
	Convert from one power-of-2 number base to another. More...
constexpr char	ToLower (char c)
	Converts the given character to its lowercase equivalent. More...
std::string	ToLower (const std::string &str)
	Returns the lowercase equivalent of the given string. More...
constexpr char	ToUpper (char c)
	Converts the given character to its uppercase equivalent. More...
std::string	ToUpper (const std::string &str)
	Returns the uppercase equivalent of the given string. More...
std::string	Capitalize (std::string str)
	Capitalizes the first character of the given string. More...

Macro Definition Documentation

ARRAYLEN

#define ARRAYLEN

(

array

)

(sizeof(array)/sizeof((array)[0]))

Utilities for converting data from/to strings.

Definition at line 20 of file strencodings.h.

Enumeration Type Documentation

SafeChars

enum SafeChars

Used by SanitizeString()

Enumerator
SAFE_CHARS_DEFAULT	The full set of allowed chars.
SAFE_CHARS_UA_COMMENT	BIP-0014 subset.
SAFE_CHARS_FILENAME	Chars allowed in filenames.
SAFE_CHARS_URI	Chars allowed in URIs (RFC 3986)

Definition at line 23 of file strencodings.h.

Function Documentation

atoi()

int atoi

(

const std::string &

str

)

Definition at line 435 of file strencodings.cpp.

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atoi64()

int64_t atoi64

(

const std::string &

str

)

Definition at line 426 of file strencodings.cpp.

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Capitalize()

std::string Capitalize

(

std::string

str

)

Capitalizes the first character of the given string.

This function is locale independent. It only converts lowercase characters in the standard 7-bit ASCII range. This is a feature, not a limitation.

Parameters

[in]

str

the string to capitalize.

Returns

string with the first letter capitalized.

Definition at line 573 of file strencodings.cpp.

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ConvertBits()

template<int frombits, int tobits, bool pad, typename O , typename I >

bool ConvertBits	(	const O &	outfn,
		I	it,
		I	end
	)

Convert from one power-of-2 number base to another.

Definition at line 177 of file strencodings.h.

DecodeBase32() [1/2]

std::vector<unsigned char> DecodeBase32	(	const char *	p,
		bool *	pf_invalid = nullptr
	)

Definition at line 224 of file strencodings.cpp.

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DecodeBase32() [2/2]

std::string DecodeBase32	(	const std::string &	str,
		bool *	pf_invalid = nullptr
	)

Definition at line 271 of file strencodings.cpp.

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DecodeBase64() [1/2]

std::vector<unsigned char> DecodeBase64	(	const char *	p,
		bool *	pf_invalid = nullptr
	)

Definition at line 145 of file strencodings.cpp.

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DecodeBase64() [2/2]

std::string DecodeBase64	(	const std::string &	str,
		bool *	pf_invalid = nullptr
	)

Definition at line 192 of file strencodings.cpp.

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EncodeBase32() [1/2]

std::string EncodeBase32	(	Span< const unsigned char >	input,
		bool	pad = true
	)

Base32 encode.

If pad is true, then the output will be padded with '=' so that its length is a multiple of 8.

Definition at line 204 of file strencodings.cpp.

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EncodeBase32() [2/2]

std::string EncodeBase32	(	const std::string &	str,
		bool	pad = true
	)

Base32 encode.

If pad is true, then the output will be padded with '=' so that its length is a multiple of 8.

Definition at line 219 of file strencodings.cpp.

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EncodeBase64() [1/2]

std::string EncodeBase64

(

Span< const unsigned char >

input

)

Definition at line 129 of file strencodings.cpp.

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EncodeBase64() [2/2]

std::string EncodeBase64

(

const std::string &

str

)

Definition at line 140 of file strencodings.cpp.

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FormatParagraph()

std::string FormatParagraph	(	const std::string &	in,
		size_t	width = 79,
		size_t	indent = 0
	)

Format a paragraph of text to a fixed width, adding spaces for indentation to any added line.

Definition at line 385 of file strencodings.cpp.

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HexDigit()

signed char HexDigit

(

char

c

)

Definition at line 56 of file strencodings.cpp.

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HexStr() [1/2]

std::string HexStr

(

const Span< const uint8_t >

s

)

Convert a span of bytes to a lower-case hexadecimal string.

Definition at line 580 of file strencodings.cpp.

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HexStr() [2/2]

std::string HexStr ( const Span< const char >  s )

inline

Definition at line 145 of file strencodings.h.

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IsDigit()

constexpr bool IsDigit

(

char

c

)

Tests if the given character is a decimal digit.

Parameters

[in]

c

character to test

Returns

true if the argument is a decimal digit; otherwise false.

Definition at line 79 of file strencodings.h.

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IsHex()

bool IsHex

(

const std::string &

str

)

Definition at line 61 of file strencodings.cpp.

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IsHexNumber()

bool IsHexNumber

(

const std::string &

str

)

Return true if the string is a hex number, optionally prefixed with "0x".

Definition at line 71 of file strencodings.cpp.

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IsSpace()

constexpr bool IsSpace ( char  c )

inlinenoexcept

Tests if the given character is a whitespace character.

The whitespace characters are: space, form-feed (''), newline ('
'), carriage return (''), horizontal tab (''), and vertical tab ('').

This function is locale independent. Under the C locale this function gives the same result as std::isspace.

Parameters

[in]

c

character to test

Returns

true if the argument is a whitespace character; otherwise false

Definition at line 95 of file strencodings.h.

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ParseDouble()

NODISCARD bool ParseDouble	(	const std::string &	str,
		double *	out
	)

Convert string to double with strict parse error feedback.

Returns

true if the entire string could be parsed as valid double, false if not the entire string could be parsed or when overflow or underflow occurred.

Definition at line 371 of file strencodings.cpp.

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ParseFixedPoint()

NODISCARD bool ParseFixedPoint	(	const std::string &	val,
		int	decimals,
		int64_t *	amount_out
	)

Parse number as fixed point according to JSON number syntax.

See http://json.org/number.gif

Returns

true on success, false on error.

Note

The result must be in the range (-10^18,10^18), otherwise an overflow error will trigger.

Definition at line 467 of file strencodings.cpp.

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ParseHex() [1/2]

std::vector<unsigned char> ParseHex

(

const char *

psz

)

Definition at line 84 of file strencodings.cpp.

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ParseHex() [2/2]

std::vector<unsigned char> ParseHex

(

const std::string &

str

)

Definition at line 105 of file strencodings.cpp.

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ParseInt32()

NODISCARD bool ParseInt32	(	const std::string &	str,
		int32_t *	out
	)

Convert string to signed 32-bit integer with strict parse error feedback.

Returns

true if the entire string could be parsed as valid integer, false if not the entire string could be parsed or when overflow or underflow occurred.

Definition at line 294 of file strencodings.cpp.

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ParseInt64()

NODISCARD bool ParseInt64	(	const std::string &	str,
		int64_t *	out
	)

Convert string to signed 64-bit integer with strict parse error feedback.

Returns

true if the entire string could be parsed as valid integer, false if not the entire string could be parsed or when overflow or underflow occurred.

Definition at line 310 of file strencodings.cpp.

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ParseUInt32()

NODISCARD bool ParseUInt32	(	const std::string &	str,
		uint32_t *	out
	)

Convert decimal string to unsigned 32-bit integer with strict parse error feedback.

Returns

true if the entire string could be parsed as valid integer, false if not the entire string could be parsed or when overflow or underflow occurred.

Definition at line 337 of file strencodings.cpp.

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ParseUInt64()

NODISCARD bool ParseUInt64	(	const std::string &	str,
		uint64_t *	out
	)

Convert decimal string to unsigned 64-bit integer with strict parse error feedback.

Returns

true if the entire string could be parsed as valid integer, false if not the entire string could be parsed or when overflow or underflow occurred.

Definition at line 354 of file strencodings.cpp.

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ParseUInt8()

NODISCARD bool ParseUInt8	(	const std::string &	str,
		uint8_t *	out
	)

Convert decimal string to unsigned 8-bit integer with strict parse error feedback.

Returns

true if the entire string could be parsed as valid integer, false if not the entire string could be parsed or when overflow or underflow occurred.

Definition at line 325 of file strencodings.cpp.

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SanitizeString()

std::string SanitizeString	(	const std::string &	str,
		int	rule = SAFE_CHARS_DEFAULT
	)

Remove unsafe chars.

Safe chars chosen to allow simple messages/URLs/email addresses, but avoid anything even possibly remotely dangerous like & or >

Parameters

[in]	str	The string to sanitize
[in]	rule	The set of safe chars to choose (default: least restrictive)

Returns

A new string without unsafe chars

Definition at line 27 of file strencodings.cpp.

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SplitHostPort()

void SplitHostPort	(	std::string	in,
		int &	portOut,
		std::string &	hostOut
	)

Definition at line 110 of file strencodings.cpp.

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TimingResistantEqual()

template<typename T >

bool TimingResistantEqual	(	const T &	a,
		const T &	b
	)

Timing-attack-resistant comparison.

Takes time proportional to length of first argument.

Definition at line 159 of file strencodings.h.

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ToLower() [1/2]

constexpr char ToLower

(

char

c

)

Converts the given character to its lowercase equivalent.

This function is locale independent. It only converts uppercase characters in the standard 7-bit ASCII range. This is a feature, not a limitation.

Parameters

[in]

c

the character to convert to lowercase.

Returns

the lowercase equivalent of c; or the argument if no conversion is possible.

Definition at line 209 of file strencodings.h.

ToLower() [2/2]

std::string ToLower

(

const std::string &

str

)

Returns the lowercase equivalent of the given string.

This function is locale independent. It only converts uppercase characters in the standard 7-bit ASCII range. This is a feature, not a limitation.

Parameters

[in]

str

the string to convert to lowercase.

Returns

lowercased equivalent of str

Definition at line 559 of file strencodings.cpp.

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ToUpper() [1/2]

constexpr char ToUpper

(

char

c

)

Converts the given character to its uppercase equivalent.

This function is locale independent. It only converts lowercase characters in the standard 7-bit ASCII range. This is a feature, not a limitation.

Parameters

[in]

c

the character to convert to uppercase.

Returns

the uppercase equivalent of c; or the argument if no conversion is possible.

Definition at line 235 of file strencodings.h.

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ToUpper() [2/2]

std::string ToUpper

(

const std::string &

str

)

Returns the uppercase equivalent of the given string.

This function is locale independent. It only converts lowercase characters in the standard 7-bit ASCII range. This is a feature, not a limitation.

Parameters

[in]

str

the string to convert to uppercase.

Returns

UPPERCASED EQUIVALENT OF str

Definition at line 566 of file strencodings.cpp.

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