112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*
|
|
* mem.h -- CoAP memory handling
|
|
*
|
|
* Copyright (C) 2010-2011,2014-2015 Olaf Bergmann <bergmann@tzi.org>
|
|
*
|
|
* This file is part of the CoAP library libcoap. Please see README for terms
|
|
* of use.
|
|
*/
|
|
|
|
#ifndef _COAP_MEM_H_
|
|
#define _COAP_MEM_H_
|
|
|
|
#include <stdlib.h>
|
|
|
|
#ifndef WITH_LWIP
|
|
/**
|
|
* Initializes libcoap's memory management.
|
|
* This function must be called once before coap_malloc() can be used on
|
|
* constrained devices.
|
|
*/
|
|
void coap_memory_init(void);
|
|
#endif /* WITH_LWIP */
|
|
|
|
/**
|
|
* Type specifiers for coap_malloc_type(). Memory objects can be typed to
|
|
* facilitate arrays of type objects to be used instead of dynamic memory
|
|
* management on constrained devices.
|
|
*/
|
|
typedef enum {
|
|
COAP_STRING,
|
|
COAP_ATTRIBUTE_NAME,
|
|
COAP_ATTRIBUTE_VALUE,
|
|
COAP_PACKET,
|
|
COAP_NODE,
|
|
COAP_CONTEXT,
|
|
COAP_ENDPOINT,
|
|
COAP_PDU,
|
|
COAP_PDU_BUF,
|
|
COAP_RESOURCE,
|
|
COAP_RESOURCEATTR
|
|
} coap_memory_tag_t;
|
|
|
|
#ifndef WITH_LWIP
|
|
|
|
/**
|
|
* Allocates a chunk of @p size bytes and returns a pointer to the newly
|
|
* allocated memory. The @p type is used to select the appropriate storage
|
|
* container on constrained devices. The storage allocated by coap_malloc_type()
|
|
* must be released with coap_free_type().
|
|
*
|
|
* @param type The type of object to be stored.
|
|
* @param size The number of bytes requested.
|
|
* @return A pointer to the allocated storage or @c NULL on error.
|
|
*/
|
|
void *coap_malloc_type(coap_memory_tag_t type, size_t size);
|
|
|
|
/**
|
|
* Releases the memory that was allocated by coap_malloc_type(). The type tag @p
|
|
* type must be the same that was used for allocating the object pointed to by
|
|
* @p .
|
|
*
|
|
* @param type The type of the object to release.
|
|
* @param p A pointer to memory that was allocated by coap_malloc_type().
|
|
*/
|
|
void coap_free_type(coap_memory_tag_t type, void *p);
|
|
|
|
/**
|
|
* Wrapper function to coap_malloc_type() for backwards compatibility.
|
|
*/
|
|
static inline void *coap_malloc(size_t size) {
|
|
return coap_malloc_type(COAP_STRING, size);
|
|
}
|
|
|
|
/**
|
|
* Wrapper function to coap_free_type() for backwards compatibility.
|
|
*/
|
|
static inline void coap_free(void *object) {
|
|
coap_free_type(COAP_STRING, object);
|
|
}
|
|
|
|
#endif /* not WITH_LWIP */
|
|
|
|
#ifdef WITH_LWIP
|
|
|
|
#include <lwip/memp.h>
|
|
|
|
/* no initialization needed with lwip (or, more precisely: lwip must be
|
|
* completely initialized anyway by the time coap gets active) */
|
|
static inline void coap_memory_init(void) {}
|
|
|
|
/* It would be nice to check that size equals the size given at the memp
|
|
* declaration, but i currently don't see a standard way to check that without
|
|
* sourcing the custom memp pools and becoming dependent of its syntax
|
|
*/
|
|
#define coap_malloc_type(type, size) memp_malloc(MEMP_ ## type)
|
|
#define coap_free_type(type, p) memp_free(MEMP_ ## type, p)
|
|
|
|
/* Those are just here to make uri.c happy where string allocation has not been
|
|
* made conditional.
|
|
*/
|
|
static inline void *coap_malloc(size_t size) {
|
|
LWIP_ASSERT("coap_malloc must not be used in lwIP", 0);
|
|
}
|
|
|
|
static inline void coap_free(void *pointer) {
|
|
LWIP_ASSERT("coap_free must not be used in lwIP", 0);
|
|
}
|
|
|
|
#endif /* WITH_LWIP */
|
|
|
|
#endif /* _COAP_MEM_H_ */
|