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122 lines
4.1 KiB
C
122 lines
4.1 KiB
C
/*
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* uri.h -- helper functions for URI treatment
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*
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* Copyright (C) 2010-2011,2016 Olaf Bergmann <bergmann@tzi.org>
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*
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* This file is part of the CoAP library libcoap. Please see README for terms
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* of use.
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*/
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#ifndef _COAP_URI_H_
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#define _COAP_URI_H_
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#include "hashkey.h"
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#include "str.h"
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/**
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* Representation of parsed URI. Components may be filled from a string with
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* coap_split_uri() and can be used as input for option-creation functions.
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*/
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typedef struct {
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str host; /**< host part of the URI */
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unsigned short port; /**< The port in host byte order */
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str path; /**< Beginning of the first path segment.
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Use coap_split_path() to create Uri-Path options */
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str query; /**< The query part if present */
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} coap_uri_t;
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/**
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* Creates a new coap_uri_t object from the specified URI. Returns the new
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* object or NULL on error. The memory allocated by the new coap_uri_t
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* must be released using coap_free().
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*
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* @param uri The URI path to copy.
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* @param length The length of uri.
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*
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* @return New URI object or NULL on error.
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*/
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coap_uri_t *coap_new_uri(const unsigned char *uri, unsigned int length);
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/**
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* Clones the specified coap_uri_t object. Thie function allocates sufficient
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* memory to hold the coap_uri_t structure and its contents. The object must
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* be released with coap_free(). */
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coap_uri_t *coap_clone_uri(const coap_uri_t *uri);
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/**
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* Calculates a hash over the given path and stores the result in
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* @p key. This function returns @c 0 on error or @c 1 on success.
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*
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* @param path The URI path to generate hash for.
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* @param len The length of @p path.
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* @param key The output buffer.
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*
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* @return @c 1 if @p key was set, @c 0 otherwise.
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*/
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int coap_hash_path(const unsigned char *path, size_t len, coap_key_t key);
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/**
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* @defgroup uri_parse URI Parsing Functions
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*
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* CoAP PDUs contain normalized URIs with their path and query split into
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* multiple segments. The functions in this module help splitting strings.
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* @{
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*/
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/**
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* Parses a given string into URI components. The identified syntactic
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* components are stored in the result parameter @p uri. Optional URI
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* components that are not specified will be set to { 0, 0 }, except for the
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* port which is set to @c COAP_DEFAULT_PORT. This function returns @p 0 if
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* parsing succeeded, a value less than zero otherwise.
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*
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* @param str_var The string to split up.
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* @param len The actual length of @p str_var
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* @param uri The coap_uri_t object to store the result.
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* @return @c 0 on success, or < 0 on error.
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*
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*/
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int coap_split_uri(const unsigned char *str_var, size_t len, coap_uri_t *uri);
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/**
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* Splits the given URI path into segments. Each segment is preceded
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* by an option pseudo-header with delta-value 0 and the actual length
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* of the respective segment after percent-decoding.
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*
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* @param s The path string to split.
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* @param length The actual length of @p s.
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* @param buf Result buffer for parsed segments.
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* @param buflen Maximum length of @p buf. Will be set to the actual number
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* of bytes written into buf on success.
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*
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* @return The number of segments created or @c -1 on error.
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*/
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int coap_split_path(const unsigned char *s,
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size_t length,
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unsigned char *buf,
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size_t *buflen);
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/**
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* Splits the given URI query into segments. Each segment is preceded
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* by an option pseudo-header with delta-value 0 and the actual length
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* of the respective query term.
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*
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* @param s The query string to split.
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* @param length The actual length of @p s.
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* @param buf Result buffer for parsed segments.
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* @param buflen Maximum length of @p buf. Will be set to the actual number
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* of bytes written into buf on success.
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*
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* @return The number of segments created or @c -1 on error.
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*
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* @bug This function does not reserve additional space for delta > 12.
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*/
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int coap_split_query(const unsigned char *s,
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size_t length,
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unsigned char *buf,
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size_t *buflen);
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/** @} */
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#endif /* _COAP_URI_H_ */
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