uri.c File Reference

#include "coap_config.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "mem.h"
#include "debug.h"
#include "pdu.h"
#include "option.h"
#include "uri.h"

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Data Structures
struct	cnt_str

Macros
#define	ISEQUAL_CI(a, b)   ((a) == (b) || (islower(b) && ((a) == ((b) - 0x20))))
#define	hexchar_to_dec(c)
	Calculates decimal value from hexadecimal ASCII character given in c. More...
#define	min(a, b)   ((a) < (b) ? (a) : (b))
#define	URI_DATA(uriobj)   ((unsigned char *)(uriobj) + sizeof(coap_uri_t))

Typedefs
typedef void(*	segment_handler_t) (unsigned char *, size_t, void *)

Functions
static unsigned char *	strnchr (unsigned char *s, size_t len, unsigned char c)
	A length-safe version of strchr(). More...
int	coap_split_uri (const unsigned char *str_var, size_t len, coap_uri_t *uri)
	Parses a given string into URI components. More...
static void	decode_segment (const unsigned char *seg, size_t length, unsigned char *buf)
	Decodes percent-encoded characters while copying the string seg of size length to buf. More...
static int	check_segment (const unsigned char *s, size_t length)
	Runs through the given path (or query) segment and checks if percent-encodings are correct. More...
static int	make_decoded_option (const unsigned char *s, size_t length, unsigned char *buf, size_t buflen)
	Writes a coap option from given string s to buf. More...
static int	dots (unsigned char *s, size_t len)
	Checks if path segment s consists of one or two dots. More...
static size_t	coap_split_path_impl (const unsigned char *s, size_t length, segment_handler_t h, void *data)
	Splits the given string into segments. More...
static void	write_option (unsigned char *s, size_t len, void *data)
int	coap_split_path (const unsigned char *s, size_t length, unsigned char *buf, size_t *buflen)
	Splits the given URI path into segments. More...
int	coap_split_query (const unsigned char *s, size_t length, unsigned char *buf, size_t *buflen)
	Splits the given URI query into segments. More...
coap_uri_t *	coap_new_uri (const unsigned char *uri, unsigned int length)
	Creates a new coap_uri_t object from the specified URI. More...
coap_uri_t *	coap_clone_uri (const coap_uri_t *uri)
	Clones the specified coap_uri_t object. More...
static void	hash_segment (unsigned char *s, size_t len, void *data)
int	coap_hash_path (const unsigned char *path, size_t len, coap_key_t key)
	Calculates a hash over the given path and stores the result in key. More...

Macro Definition Documentation

hexchar_to_dec

#define hexchar_to_dec

(

c

)

Calculates decimal value from hexadecimal ASCII character given in c.

The caller must ensure that c actually represents a valid heaxdecimal character, e.g. with isxdigit(3).

Definition at line 190 of file uri.c.

ISEQUAL_CI

#define ISEQUAL_CI	(		a,
			b
	)		((a) == (b) || (islower(b) && ((a) == ((b) - 0x20))))

Definition at line 44 of file uri.c.

min

#define min	(		a,
			b
	)		((a) < (b) ? (a) : (b))

Definition at line 303 of file uri.c.

URI_DATA

#define URI_DATA

(

uriobj

)

((unsigned char *)(uriobj) + sizeof(coap_uri_t))

Definition at line 411 of file uri.c.

Typedef Documentation

segment_handler_t

typedef void(* segment_handler_t) (unsigned char *, size_t, void *)

Definition at line 306 of file uri.c.

Function Documentation

check_segment()

static int check_segment ( const unsigned char *  s, size_t  length  )

static

Runs through the given path (or query) segment and checks if percent-encodings are correct.

This function returns -1 on error or the length of s when decoded.

Definition at line 227 of file uri.c.

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coap_clone_uri()

coap_uri_t* coap_clone_uri

(

const coap_uri_t *

uri

)

Clones the specified coap_uri_t object.

Thie function allocates sufficient memory to hold the coap_uri_t structure and its contents. The object must be released with coap_free().

Definition at line 433 of file uri.c.

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coap_hash_path()

int coap_hash_path	(	const unsigned char *	path,
		size_t	len,
		coap_key_t	key
	)

Calculates a hash over the given path and stores the result in key.

This function returns 0 on error or 1 on success.

Parameters

path	The URI path to generate hash for.
len	The length of path.
key	The output buffer.

Returns

1 if key was set, 0 otherwise.

Definition at line 483 of file uri.c.

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coap_new_uri()

coap_uri_t* coap_new_uri	(	const unsigned char *	uri,
		unsigned int	length
	)

Creates a new coap_uri_t object from the specified URI.

Returns the new object or NULL on error. The memory allocated by the new coap_uri_t must be released using coap_free().

Parameters

uri	The URI path to copy.
length	The length of uri.

Returns

New URI object or NULL on error.

Definition at line 414 of file uri.c.

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coap_split_path_impl()

static size_t coap_split_path_impl ( const unsigned char *  s, size_t  length, segment_handler_t  h, void *  data  )

static

Splits the given string into segments.

You should call one of the macros coap_split_path() or coap_split_query() instead.

Parameters

s	The URI string to be tokenized.
length	The length of s.
h	A handler that is called with every token.
data	Opaque data that is passed to h when called.

Returns

The number of characters that have been parsed from s.

Definition at line 328 of file uri.c.

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decode_segment()

static void decode_segment ( const unsigned char *  seg, size_t  length, unsigned char *  buf  )

static

Decodes percent-encoded characters while copying the string seg of size length to buf.

The caller of this function must ensure that the percent-encodings are correct (i.e. the character '' is always followed by two hex digits. and that buf provides sufficient space to hold the result. This function is supposed to be called by make_decoded_option() only.

Parameters

seg	The segment to decode and copy.
length	Length of seg.
buf	The result buffer.

Definition at line 205 of file uri.c.

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dots()

static int dots ( unsigned char *  s, size_t  len  )

inlinestatic

Checks if path segment s consists of one or two dots.

Definition at line 312 of file uri.c.

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hash_segment()

static void hash_segment ( unsigned char *  s, size_t  len, void *  data  )

inlinestatic

Definition at line 478 of file uri.c.

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make_decoded_option()

static int make_decoded_option ( const unsigned char *  s, size_t  length, unsigned char *  buf, size_t  buflen  )

static

Writes a coap option from given string s to buf.

s should point to a (percent-encoded) path or query segment of a coap_uri_t object. The created option will have type 0, and the length parameter will be set according to the size of the decoded string. On success, this function returns the option's size, or a value less than zero on error. This function must be called from coap_split_path_impl() only.

Parameters

s	The string to decode.
length	The size of the percent-encoded string s.
buf	The buffer to store the new coap option.
buflen	The maximum size of buf.

Returns

The option's size, or -1 on error.

Bug:

This function does not split segments that are bigger than 270 bytes.

Definition at line 266 of file uri.c.

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strnchr()

static unsigned char* strnchr ( unsigned char *  s, size_t  len, unsigned char  c  )

inlinestatic

A length-safe version of strchr().

This function returns a pointer to the first occurrence of c in s, or NULL if not found.

Parameters

s	The string to search for c.
len	The length of s.
c	The character to search.

Returns

A pointer to the first occurence of c, or NULL if not found.

Definition at line 37 of file uri.c.

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write_option()

static void write_option ( unsigned char *  s, size_t  len, void *  data  )

static

Definition at line 362 of file uri.c.

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