1 /* mem.c -- CoAP memory handling
2 *
3 * Copyright (C) 2014--2015 Olaf Bergmann <bergmann@tzi.org>
4 *
5 * This file is part of the CoAP library libcoap. Please see
6 * README for terms of use.
7 */
8
9
10 #include "coap_config.h"
11 #include "mem.h"
12 #include "debug.h"
13
14 #ifdef HAVE_ASSERT_H
15 #include <assert.h>
16 #else /* HAVE_ASSERT_H */
17 #define assert(...)
18 #endif /* HAVE_ASSERT_H */
19
20 #ifdef HAVE_MALLOC
21 #include <stdlib.h>
22
23 void
coap_memory_init(void)24 coap_memory_init(void) {
25 }
26
27 #ifdef __GNUC__
28 #define UNUSED_PARAM __attribute__((unused))
29 #else
30 #define UNUSED_PARAM
31 #endif /* __GNUC__ */
32
33 void *
coap_malloc_type(coap_memory_tag_t type UNUSED_PARAM,size_t size)34 coap_malloc_type(coap_memory_tag_t type UNUSED_PARAM, size_t size) {
35 return malloc(size);
36 }
37
38 void
coap_free_type(coap_memory_tag_t type UNUSED_PARAM,void * p)39 coap_free_type(coap_memory_tag_t type UNUSED_PARAM, void *p) {
40 free(p);
41 }
42
43 #else /* HAVE_MALLOC */
44
45 #ifdef WITH_CONTIKI
46
47 #define COAP_MAX_STRING_SIZE 12
48 #define COAP_MAX_STRINGS 8
49
50 struct coap_string_t {
51 char data[COAP_MAX_STRING_SIZE];
52 };
53
54 #include "coap_config.h"
55 #include "net.h"
56 #include "pdu.h"
57 #include "coap_io.h"
58 #include "resource.h"
59
60 #define COAP_MAX_PACKET_SIZE (sizeof(coap_packet_t) + COAP_MAX_PDU_SIZE)
61 #define COAP_MAX_PACKETS 2
62
63 typedef union {
64 coap_pdu_t packet; /* try to convince the compiler to word-align this structure */
65 char buf[COAP_MAX_PACKET_SIZE];
66 } coap_packetbuf_t;
67
68 MEMB(string_storage, struct coap_string_t, COAP_MAX_STRINGS);
69 MEMB(packet_storage, coap_packetbuf_t, COAP_MAX_PACKETS);
70 MEMB(node_storage, coap_queue_t, COAP_PDU_MAXCNT);
71 MEMB(pdu_storage, coap_pdu_t, COAP_PDU_MAXCNT);
72 MEMB(pdu_buf_storage, coap_packetbuf_t, COAP_PDU_MAXCNT);
73 MEMB(resource_storage, coap_resource_t, COAP_MAX_RESOURCES);
74 MEMB(attribute_storage, coap_attr_t, COAP_MAX_ATTRIBUTES);
75
76 static struct memb *
get_container(coap_memory_tag_t type)77 get_container(coap_memory_tag_t type) {
78 switch(type) {
79 case COAP_PACKET: return &packet_storage;
80 case COAP_NODE: return &node_storage;
81 case COAP_PDU: return &pdu_storage;
82 case COAP_PDU_BUF: return &pdu_buf_storage;
83 case COAP_RESOURCE: return &resource_storage;
84 case COAP_RESOURCEATTR: return &attribute_storage;
85 default:
86 return &string_storage;
87 }
88 }
89
90 void
coap_memory_init(void)91 coap_memory_init(void) {
92 memb_init(&string_storage);
93 memb_init(&packet_storage);
94 memb_init(&node_storage);
95 memb_init(&pdu_storage);
96 memb_init(&pdu_buf_storage);
97 memb_init(&resource_storage);
98 memb_init(&attribute_storage);
99 }
100
101 void *
coap_malloc_type(coap_memory_tag_t type,size_t size)102 coap_malloc_type(coap_memory_tag_t type, size_t size) {
103 struct memb *container = get_container(type);
104
105 assert(container);
106
107 if (size > container->size) {
108 debug("coap_malloc_type: Requested memory exceeds maximum object size\n");
109 return NULL;
110 }
111
112 return memb_alloc(container);
113 }
114
115 void
coap_free_type(coap_memory_tag_t type,void * object)116 coap_free_type(coap_memory_tag_t type, void *object) {
117 memb_free(get_container(type), object);
118 }
119 #endif /* WITH_CONTIKI */
120
121 #endif /* HAVE_MALLOC */
122
