CoAP option handling functions. More...

#include "coap3/coap_libcoap_build.h"
#include <stdio.h>
#include <string.h>

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Macros
#define	ADVANCE_OPT(o, e, step)

#define	ADVANCE_OPT_CHECK(o, e, step)

#define	LONG_MASK ((1 << COAP_OPT_FILTER_LONG) - 1)

#define	SHORT_MASK (~LONG_MASK & ((1 << (COAP_OPT_FILTER_LONG + COAP_OPT_FILTER_SHORT)) - 1))

Enumerations
enum	filter_op_t { FILTER_SET , FILTER_CLEAR , FILTER_GET }
	Operation specifiers for coap_filter_op(). More...

Functions
size_t	coap_opt_parse (const coap_opt_t opt, size_t length, coap_option_t result)
	Parses the option pointed to by `opt` into `result`. More...

coap_opt_iterator_t *	coap_option_iterator_init (const coap_pdu_t pdu, coap_opt_iterator_t oi, const coap_opt_filter_t *filter)
	Initializes the given option iterator `oi` to point to the beginning of the `pdu's` option list. More...

COAP_STATIC_INLINE int	opt_finished (coap_opt_iterator_t *oi)

coap_opt_t *	coap_option_next (coap_opt_iterator_t *oi)
	Updates the iterator `oi` to point to the next option. More...

coap_opt_t *	coap_check_option (const coap_pdu_t pdu, coap_option_num_t number, coap_opt_iterator_t oi)
	Retrieves the first option of number `number` from `pdu`. More...

uint32_t	coap_opt_length (const coap_opt_t *opt)
	Returns the length of the given option. More...

const uint8_t *	coap_opt_value (const coap_opt_t *opt)
	Returns a pointer to the value of the given option. More...

size_t	coap_opt_size (const coap_opt_t *opt)
	Returns the size of the given option, taking into account a possible option jump. More...

size_t	coap_opt_setheader (coap_opt_t *opt, size_t maxlen, uint16_t delta, size_t length)
	Encodes the given delta and length values into `opt`. More...

size_t	coap_opt_encode_size (uint16_t delta, size_t length)
	Compute storage bytes needed for an option with given `delta` and `length`. More...

size_t	coap_opt_encode (coap_opt_t opt, size_t maxlen, uint16_t delta, const uint8_t val, size_t length)
	Encodes option with given `delta` into `opt`. More...

COAP_STATIC_INLINE int	is_long_option (coap_option_num_t number)
	Returns true iff `number` denotes an option number larger than 255. More...

static int	coap_option_filter_op (coap_opt_filter_t *filter, coap_option_num_t number, enum filter_op_t op)
	Applies `op` on `filter` with respect to `number`. More...

void	coap_option_filter_clear (coap_opt_filter_t *filter)
	Clears filter `filter`. More...

int	coap_option_filter_set (coap_opt_filter_t *filter, coap_option_num_t option)
	Sets the corresponding entry for `number` in `filter`. More...

int	coap_option_filter_unset (coap_opt_filter_t *filter, coap_option_num_t option)
	Clears the corresponding entry for `number` in `filter`. More...

int	coap_option_filter_get (coap_opt_filter_t *filter, coap_option_num_t option)
	Checks if `number` is contained in `filter`. More...

coap_optlist_t *	coap_new_optlist (uint16_t number, size_t length, const uint8_t *data)
	Create a new optlist entry. More...

static int	order_opts (void a, void b)

int	coap_add_optlist_pdu (coap_pdu_t pdu, coap_optlist_t *options)
	The current optlist of `optlist_chain` is first sorted (as per RFC7272 ordering requirements) and then added to the `pdu`. More...

int	coap_insert_optlist (coap_optlist_t *head, coap_optlist_t node)
	Adds `optlist` to the given `optlist_chain`. More...

static int	coap_internal_delete (coap_optlist_t *node)

void	coap_delete_optlist (coap_optlist_t *queue)
	Removes all entries from the `optlist_chain`, freeing off their memory usage. More...

Detailed Description

CoAP option handling functions.

Definition in file coap_option.c.

Macro Definition Documentation

◆ ADVANCE_OPT

#define ADVANCE_OPT	(	o,
		e,
		step
	)

Value:

    if ((e) < step) {           \
    coap_log_debug("cannot advance opt past end\n"); \
    return 0;                                             \
  } else {                                                \
    (e) -= step;                                          \
    (o) = ((o)) + step;                                   \
  }

Definition at line 22 of file coap_option.c.

◆ ADVANCE_OPT_CHECK

#define ADVANCE_OPT_CHECK	(	o,
		e,
		step
	)

Value:

    do { \
    ADVANCE_OPT(o,e,step);               \
    if ((e) < 1)                         \
      return 0;                          \
  } while (0)

Definition at line 34 of file coap_option.c.

◆ LONG_MASK

#define LONG_MASK ((1 << COAP_OPT_FILTER_LONG) - 1)

Definition at line 398 of file coap_option.c.

◆ SHORT_MASK

#define SHORT_MASK (~LONG_MASK & ((1 << (COAP_OPT_FILTER_LONG + COAP_OPT_FILTER_SHORT)) - 1))

Definition at line 399 of file coap_option.c.

Enumeration Type Documentation

◆ filter_op_t

enum filter_op_t

Operation specifiers for coap_filter_op().

Enumerator
FILTER_SET
FILTER_CLEAR
FILTER_GET

Definition at line 409 of file coap_option.c.

Function Documentation

◆ coap_internal_delete()

static int coap_internal_delete ( coap_optlist_t * node )

static

Definition at line 584 of file coap_option.c.

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◆ coap_opt_parse()

size_t coap_opt_parse	(	const coap_opt_t *	opt,
		size_t	length,
		coap_option_t *	result
	)

Parses the option pointed to by opt into result.

This function returns the number of bytes that have been parsed, or 0 on error. An error is signaled when illegal delta or length values are encountered or when option parsing would result in reading past the option (i.e. beyond opt + length).

Parameters

opt	The beginning of the option to parse.
length	The maximum length of `opt`.
result	A pointer to the coap_option_t structure that is filled with actual values iff coap_opt_parse() > 0.

Returns: The number of bytes parsed or 0 on error.

Definition at line 41 of file coap_option.c.

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◆ coap_opt_size()

size_t coap_opt_size ( const coap_opt_t * opt )

Returns the size of the given option, taking into account a possible option jump.

Parameters

opt	An option jump or the beginning of the option.

Returns: The number of bytes between opt and the end of the option starting at opt. In case of an error, this function returns 0 as options need at least one byte storage space.

Definition at line 284 of file coap_option.c.

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◆ coap_option_filter_op()

static int coap_option_filter_op	(	coap_opt_filter_t *	filter,
		coap_option_num_t	number,
		enum filter_op_t	op
	)

static

Applies op on filter with respect to number.

The following operations are defined:

FILTER_SET: Store number into an empty slot in filter. Returns 1 on success, or 0 if no spare slot was available.

FILTER_CLEAR: Remove number from filter if it exists.

FILTER_GET: Search for number in filter. Returns 1 if found, or 0 if not found.

Parameters

filter	The filter object.
number	The option number to set, get or clear in `filter`.
op	The operation to apply to `filter` and `number`.

Returns: 1 on success, and 0 when FILTER_GET yields no hit or no free slot is available to store number with FILTER_SET.

Definition at line 431 of file coap_option.c.

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◆ is_long_option()

COAP_STATIC_INLINE int is_long_option ( coap_option_num_t number )

Returns true iff number denotes an option number larger than 255.

Definition at line 404 of file coap_option.c.

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◆ opt_finished()

COAP_STATIC_INLINE int opt_finished ( coap_opt_iterator_t * oi )

Definition at line 141 of file coap_option.c.

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◆ order_opts()

static int order_opts	(	void *	a,
		void *	b
	)

static

Definition at line 540 of file coap_option.c.

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Macros

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ ADVANCE_OPT

◆ ADVANCE_OPT_CHECK

◆ LONG_MASK

◆ SHORT_MASK

Enumeration Type Documentation

◆ filter_op_t

Function Documentation

◆ coap_internal_delete()

◆ coap_opt_parse()

◆ coap_opt_size()

◆ coap_option_filter_op()

◆ is_long_option()

◆ opt_finished()

◆ order_opts()