mem.h

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/*
 * mem.h -- CoAP memory handling
 *
 * Copyright (C) 2010-2011,2014-2015 Olaf Bergmann <bergmann@tzi.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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
void coap_memory_init(void);
#endif /* WITH_LWIP */
 
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_DTLS_SESSION,
  COAP_SESSION,
  COAP_OPTLIST,
  COAP_CACHE_KEY,
  COAP_CACHE_ENTRY,
  COAP_LG_XMIT,
  COAP_LG_CRCV,
  COAP_LG_SRCV,
  COAP_DIGEST_CTX,
  COAP_SUBSCRIPTION,
  COAP_DTLS_CONTEXT,
} coap_memory_tag_t;
 
#ifndef WITH_LWIP
 
void *coap_malloc_type(coap_memory_tag_t type, size_t size);
 
void *coap_realloc_type(coap_memory_tag_t type, void *p, size_t size);
 
void coap_free_type(coap_memory_tag_t type, void *p);
 
COAP_STATIC_INLINE void *coap_malloc(size_t size) {
  return coap_malloc_type(COAP_STRING, size);
}
 
COAP_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)  */
COAP_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, asize) \
 (((asize) <= memp_pools[MEMP_ ## type]->size) ? \
                                         memp_malloc(MEMP_ ## type) : NULL)
#define coap_free_type(type, p) memp_free(MEMP_ ## type, p)
 
/* As these are fixed size, return value if already defined */
#define coap_realloc_type(type, p, asize) \
  ((p) ? ((asize) <= memp_pools[MEMP_ ## type]->size) ? (p) : NULL : coap_malloc_type(type, asize))
 
/* Those are just here to make uri.c happy where string allocation has not been
 * made conditional.
 */
COAP_STATIC_INLINE void *coap_malloc(size_t size) {
  (void)size;
  LWIP_ASSERT("coap_malloc must not be used in lwIP", 0);
}
 
COAP_STATIC_INLINE void coap_free(void *pointer) {
  (void)pointer;
  LWIP_ASSERT("coap_free must not be used in lwIP", 0);
}
 
#endif /* WITH_LWIP */
 
#endif /* COAP_MEM_H_ */