text_util.h File Reference

This file contains definitions for ARI text CODEC functions. More...

#include "cace/cace_data.h"
#include <m-string.h>
#include <stdint.h>
#include <time.h>

Include dependency graph for text_util.h:

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Functions
bool	cace_ari_text_is_identity (const cace_data_t *text)
	Determine if a text string conforms to the "id-text" rule from Section 4.1 of [ietf-dtn-ari-00].
int	cace_uri_percent_encode (m_string_t out, const cace_data_t *in, const char *safe)
	Encode to URI percent-encoding text form.
int	cace_uri_percent_decode (m_string_t out, const cace_data_t *in)
	Decode from URI percent-encoding text form.
int	cace_ari_uint64_encode (m_string_t out, uint64_t value, int base)
	Encode an unsigned integer to text form.
int	cace_ari_uint64_decode (uint64_t *out, const m_string_t in)
int	cace_ari_float64_encode (m_string_t out, double value, char form)
	Encode a floating point number to text form.
int	cace_decfrac_encode (m_string_t out, const struct timespec *in)
	Encode a decimal fraction to text form.
int	cace_decfrac_decode (struct timespec *out, const cace_data_t *in)
	Decode a decimal fraction from text.
bool	cace_data_is_utf8 (const cace_data_t *in)
	Determine if data contains only valid UTF-8 code points.
int	cace_slash_escape (m_string_t out, const cace_data_t *in, const char quote)
	Escape backslashes in tstr or bstr text form.
int	cace_slash_unescape (m_string_t out, const cace_data_t *in)
	Unescape backslashes in tstr/bstr text form.
void	cace_strip_space (m_string_t out, const char *in, size_t in_len)
	Remove whitespace characters from a text string.
void	cace_string_tolower (m_string_t out)
	Convert a text string to lowercase.
void	cace_string_toupper (m_string_t out)
	Convert a text string to uppercase.
int	cace_base16_encode (m_string_t out, const cace_data_t *in, bool uppercase)
	Encode to base16 text form.
int	cace_base16_decode (cace_data_t *out, const m_string_t in)
	Decode base16 text form.
int	cace_base64_encode (m_string_t out, const cace_data_t *in, bool useurl, bool usepad)
	Encode base64 and base64url text forms.
int	cace_base64_decode (cace_data_t *out, const m_string_t in)
	Decode base64 and base64url text forms.
int	cace_date_encode (m_string_t out, const struct tm *in, bool usesep)
	Encode to a Gregorian date in text form.
int	cace_date_decode (struct tm *out, const cace_data_t *in)
	Decode a UTC time from text form.
int	cace_utctime_encode (m_string_t out, const struct timespec *in, bool usesep)
	Encode to a UTC time in text form.
int	cace_utctime_decode (struct timespec *out, const cace_data_t *in)
	Decode a UTC time from text form.
int	cace_timeperiod_encode (m_string_t out, const struct timespec *in)
	Encode a signed time period time in text form.
int	cace_timeperiod_decode (struct timespec *out, const cace_data_t *in)
	Decode a signed time period from text form.

Detailed Description

This file contains definitions for ARI text CODEC functions.

Function Documentation

cace_ari_float64_encode()

int cace_ari_float64_encode	(	m_string_t	out,
		double	value,
		char	form
	)

Encode a floating point number to text form.

Parameters

[out]	out	The output buffer, which will be appended to.
	value	The value to encode.
	form	The encoding form as one of: 'f' 'g' 'x'

Returns

Zero upon success.

cace_ari_text_is_identity()

bool cace_ari_text_is_identity

(

const cace_data_t *

text

)

Determine if a text string conforms to the "id-text" rule from Section 4.1 of [ietf-dtn-ari-00].

Parameters

[in]

text

The null-terminated text string.

Returns

True if the text matches the identifier rule.

References CHKFALSE, and cace_data_t::ptr.

cace_ari_uint64_encode()

int cace_ari_uint64_encode	(	m_string_t	out,
		uint64_t	value,
		int	base
	)

Encode an unsigned integer to text form.

The sign will be prepended as necessary.

Parameters

[out]	out	The output buffer, which will be appended to.
	in	The input encoded text which may be null-terminated.
	base	The base to encode to, which must be one of: 2, 10, 16.

Returns

Zero upon success.

References CHKERR1.

cace_base16_decode()

int cace_base16_decode	(	cace_data_t *	out,
		const m_string_t	in
	)

Decode base16 text form.

This is defined in Section 8 of RFC 4648 [11].

Parameters

[out]	out	The output buffer, which will be sized to its data.
[in]	in	The input buffer to read, which must be null terminated. Whitespace in the input must have already been removed with strip_space().

Returns

Zero upon success.

References cace_data_resize(), CHKERR1, and cace_data_t::ptr.

cace_base16_encode()

int cace_base16_encode	(	m_string_t	out,
		const cace_data_t *	in,
		bool	uppercase
	)

Encode to base16 text form.

This is defined in Section 8 of RFC 4648 [11].

Parameters

[out]	out	The output buffer, which will be appended to.
[in]	in	The input buffer to read.
	uppercase	True to use upper-case letters, false to use lower-case.

Returns

Zero upon success.

References cace_data_t::len, and cace_data_t::ptr.

cace_base64_decode()

int cace_base64_decode	(	cace_data_t *	out,
		const m_string_t	in
	)

Decode base64 and base64url text forms.

These is defined in Section 4 and 5 of RFC 4648 [11].

Parameters

[out]	out	The output buffer, which will be sized to its data.
[in]	in	The input buffer to read, which must be null terminated. Whitespace in the input must have already been removed with strip_space().

Returns

Zero upon success.

References cace_data_extend_back(), cace_data_resize(), CHKERR1, and cace_data_t::ptr.

cace_base64_encode()

int cace_base64_encode	(	m_string_t	out,
		const cace_data_t *	in,
		bool	useurl,
		bool	usepad
	)

Encode base64 and base64url text forms.

These is defined in Section 4 and 5 of RFC 4648 [11].

Parameters

[out]	out	The output buffer, which will be appended to.
[in]	in	The input buffer to read.
	useurl	True to use the base64url alphabet, false to use the base64 alphabet.
	usepad	True to include padding characters (=), false to not use padding.

Returns

Zero upon success.

References cace_data_t::len, and cace_data_t::ptr.

cace_data_is_utf8()

bool cace_data_is_utf8

(

const cace_data_t *

in

)

Determine if data contains only valid UTF-8 code points.

Parameters

[in]

in

The data to check.

Returns

True if the data contains no null codepoints and only valid UTF-8 codepoints.

References CHKFALSE, cace_data_t::len, and cace_data_t::ptr.

cace_date_decode()

int cace_date_decode	(	struct tm *	out,
		const cace_data_t *	in
	)

Decode a UTC time from text form.

This is defined in Appendix A of RFC 3339 [12].

Parameters

[out]	out	The decoded time from DTN epoch.
	in	The input buffer to read, which may be null terminated.

Returns

Zero upon success.

References CHKERR1, and cace_data_t::ptr.

cace_date_encode()

int cace_date_encode	(	m_string_t	out,
		const struct tm *	in,
		bool	usesep
	)

Encode to a Gregorian date in text form.

This is defined as "full-date" in Appendix A of RFC 3339 [12].

Note

The CBOR tag 100 epoch of 1970-01-01 is used from [10].

Parameters

[out]	out	The output buffer, which will be sized to its text and null terminated.
[in]	in	The time in separated fields.
	usesep	If true component separators will be added, if false the concise form is used.

Returns

Zero upon success.

References CHKERR1.

cace_decfrac_decode()

int cace_decfrac_decode	(	struct timespec *	out,
		const cace_data_t *	in
	)

Decode a decimal fraction from text.

Parameters

[out]	out	The fractional value with least digit 1e-9
[in]	in	The input buffer to read, which may be null terminated.

Returns

Zero upon success. Or 1 to indicate an argument error, 2 to indicate a numeric error, 3 to indicate extra text at the end, and 4 to indicate value underflow.

References CHKERR1, and cace_data_t::ptr.

cace_decfrac_encode()

int cace_decfrac_encode	(	m_string_t	out,
		const struct timespec *	in
	)

Encode a decimal fraction to text form.

Parameters

[out]	out	The output buffer, which will be appended to.
	in	The input fractional value with least digit 1e-9

Returns

Zero upon success.

References CHKERR1.

cace_slash_escape()

int cace_slash_escape	(	m_string_t	out,
		const cace_data_t *	in,
		const char	quote
	)

Escape backslashes in tstr or bstr text form.

This is defined in Section G.2 of RFC 8610 [2] and Section 7 of RFC 8259 [8].

Parameters

[out]	out	The output buffer, which will be appended to.
	in	The input buffer to read, which must be null terminated.
	quote	The character used to quote the string.

Returns

Zero upon success.

References CHKERR1, cace_data_t::len, and cace_data_t::ptr.

cace_slash_unescape()

int cace_slash_unescape	(	m_string_t	out,
		const cace_data_t *	in
	)

Unescape backslashes in tstr/bstr text form.

This is defined in Section G.2 of RFC8610 [2].

Parameters

[out]	out	The output buffer, which will be appended to.
	in	The input buffer to read, which may be null terminated.

Returns

Zero upon success.

References cace_data_append_byte(), cace_data_copy(), cace_data_deinit(), cace_data_init(), cace_data_init_view(), CHKERR1, cace_data_t::len, and cace_data_t::ptr.

cace_string_tolower()

void cace_string_tolower

(

m_string_t

out

)

Convert a text string to lowercase.

This is written to work on byte strings, not unicode.

Parameters

[out]

out

The output buffer, which will be replaced.

References CHKVOID.

cace_string_toupper()

void cace_string_toupper

(

m_string_t

out

)

Convert a text string to uppercase.

This is written to work on byte strings, not unicode.

Parameters

[out]

out

The output buffer, which will be replaced.

References CHKVOID.

cace_strip_space()

void cace_strip_space	(	m_string_t	out,
		const char *	in,
		size_t	in_len
	)

Remove whitespace characters from a text string.

This is based on isspace() inspection.

Parameters

[out]	out	The output buffer, which will be replaced.
[in]	in	The input text to read.
	in_len	The length of text not including null terminator.

cace_timeperiod_decode()

int cace_timeperiod_decode	(	struct timespec *	out,
		const cace_data_t *	in
	)

Decode a signed time period from text form.

This is defined in Appendix A of RFC 3339 [12] with the addition of an optional leading sign character.

Parameters

[out]	out	The decoded relative time.
	in	The input buffer to read, which may be null terminated.

Returns

Zero upon success.

References CHKERR1, and cace_data_t::ptr.

cace_timeperiod_encode()

int cace_timeperiod_encode	(	m_string_t	out,
		const struct timespec *	in
	)

Encode a signed time period time in text form.

This is defined in Appendix A of RFC 3339 [12] with the addition of an optional leading sign character.

Parameters

[out]	out	The output buffer, which will be sized to its text and null terminated.
	in	The relative time.

Returns

Zero upon success.

References CHKERR1.

cace_uri_percent_decode()

int cace_uri_percent_decode	(	m_string_t	out,
		const cace_data_t *	in
	)

Decode from URI percent-encoding text form.

This is defined in Section 2.1 of RFC 3986 [1].

Parameters

[out]	out	The output buffer, which will be appended to.
[in]	in	The input encoded text which may be null-terminated.

Returns

Zero upon success.

References CHKERR1, and cace_data_t::ptr.

cace_uri_percent_encode()

int cace_uri_percent_encode	(	m_string_t	out,
		const cace_data_t *	in,
		const char *	safe
	)

Encode to URI percent-encoding text form.

This is defined in Section 2.1 of RFC 3986 [1]. The set of unreserved characters are alpha, digits, and _.-~ characters. in accordance with Section 2.3 of RFC 3986 [1].

Parameters

[out]	out	The output buffer, which will be appended to.
	in	The input encoded text which is null-terminated.
	safe	A set of additional safe characters to not be encoded, which is null-terminated.

Returns

Zero upon success.

References CHKERR1, and cace_data_t::ptr.

cace_utctime_decode()

int cace_utctime_decode	(	struct timespec *	out,
		const cace_data_t *	in
	)

Decode a UTC time from text form.

This is defined in Appendix A of RFC 3339 [12] with the addition of an optional leading sign character.

Parameters

[out]	out	The decoded time from DTN epoch.
[in]	in	The input buffer to read, which may be null terminated.

Returns

Zero upon success.

References cace_ari_dtn_epoch, CHKERR1, and cace_data_t::ptr.

cace_utctime_encode()

int cace_utctime_encode	(	m_string_t	out,
		const struct timespec *	in,
		bool	usesep
	)

Encode to a UTC time in text form.

This is defined in Appendix A of RFC 3339 [12].

Note

The DTN epoch is 2000-01-01T00:00:00Z from [9].

Parameters

[out]	out	The output buffer, which will be sized to its text and null terminated.
[in]	in	The time from DTN epoch.
	usesep	If true component separators will be added, if false the concise form is used.

Returns

Zero upon success.