Yasushi TAUCHI / Mbed 2 deprecated giken9_HTMLServer_Sample

ソースの整理中ですが、利用はできます。

Dependencies:   EthernetInterface HttpServer TextLCD mbed-rpc mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/api/netbuf.c@2:14b689a85306, 2014-03-12 (annotated)

Committer:
yueee_yt
Date:
Wed Mar 12 04:39:15 2014 +0000
Revision:
2:14b689a85306
Parent:
0:7766f6712673 
bug fix

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yueee_yt 0:7766f6712673 1 /**
yueee_yt 0:7766f6712673 2 * @file
yueee_yt 0:7766f6712673 3 * Network buffer management
yueee_yt 0:7766f6712673 4 *
yueee_yt 0:7766f6712673 5 */
yueee_yt 0:7766f6712673 6
yueee_yt 0:7766f6712673 7 /*
yueee_yt 0:7766f6712673 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
yueee_yt 0:7766f6712673 9 * All rights reserved.
yueee_yt 0:7766f6712673 10 *
yueee_yt 0:7766f6712673 11 * Redistribution and use in source and binary forms, with or without modification,
yueee_yt 0:7766f6712673 12 * are permitted provided that the following conditions are met:
yueee_yt 0:7766f6712673 13 *
yueee_yt 0:7766f6712673 14 * 1. Redistributions of source code must retain the above copyright notice,
yueee_yt 0:7766f6712673 15 * this list of conditions and the following disclaimer.
yueee_yt 0:7766f6712673 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
yueee_yt 0:7766f6712673 17 * this list of conditions and the following disclaimer in the documentation
yueee_yt 0:7766f6712673 18 * and/or other materials provided with the distribution.
yueee_yt 0:7766f6712673 19 * 3. The name of the author may not be used to endorse or promote products
yueee_yt 0:7766f6712673 20 * derived from this software without specific prior written permission.
yueee_yt 0:7766f6712673 21 *
yueee_yt 0:7766f6712673 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
yueee_yt 0:7766f6712673 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
yueee_yt 0:7766f6712673 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
yueee_yt 0:7766f6712673 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
yueee_yt 0:7766f6712673 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
yueee_yt 0:7766f6712673 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
yueee_yt 0:7766f6712673 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
yueee_yt 0:7766f6712673 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
yueee_yt 0:7766f6712673 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
yueee_yt 0:7766f6712673 31 * OF SUCH DAMAGE.
yueee_yt 0:7766f6712673 32 *
yueee_yt 0:7766f6712673 33 * This file is part of the lwIP TCP/IP stack.
yueee_yt 0:7766f6712673 34 *
yueee_yt 0:7766f6712673 35 * Author: Adam Dunkels <adam@sics.se>
yueee_yt 0:7766f6712673 36 *
yueee_yt 0:7766f6712673 37 */
yueee_yt 0:7766f6712673 38
yueee_yt 0:7766f6712673 39 #include "lwip/opt.h"
yueee_yt 0:7766f6712673 40
yueee_yt 0:7766f6712673 41 #if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
yueee_yt 0:7766f6712673 42
yueee_yt 0:7766f6712673 43 #include "lwip/netbuf.h"
yueee_yt 0:7766f6712673 44 #include "lwip/memp.h"
yueee_yt 0:7766f6712673 45
yueee_yt 0:7766f6712673 46 #include <string.h>
yueee_yt 0:7766f6712673 47
yueee_yt 0:7766f6712673 48 /**
yueee_yt 0:7766f6712673 49 * Create (allocate) and initialize a new netbuf.
yueee_yt 0:7766f6712673 50 * The netbuf doesn't yet contain a packet buffer!
yueee_yt 0:7766f6712673 51 *
yueee_yt 0:7766f6712673 52 * @return a pointer to a new netbuf
yueee_yt 0:7766f6712673 53 * NULL on lack of memory
yueee_yt 0:7766f6712673 54 */
yueee_yt 0:7766f6712673 55 struct
yueee_yt 0:7766f6712673 56 netbuf *netbuf_new(void)
yueee_yt 0:7766f6712673 57 {
yueee_yt 0:7766f6712673 58 struct netbuf *buf;
yueee_yt 0:7766f6712673 59
yueee_yt 0:7766f6712673 60 buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
yueee_yt 0:7766f6712673 61 if (buf != NULL) {
yueee_yt 0:7766f6712673 62 buf->p = NULL;
yueee_yt 0:7766f6712673 63 buf->ptr = NULL;
yueee_yt 0:7766f6712673 64 ip_addr_set_any(&buf->addr);
yueee_yt 0:7766f6712673 65 buf->port = 0;
yueee_yt 0:7766f6712673 66 #if LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 67 #if LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 68 buf->flags = 0;
yueee_yt 0:7766f6712673 69 #endif /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 70 buf->toport_chksum = 0;
yueee_yt 0:7766f6712673 71 #if LWIP_NETBUF_RECVINFO
yueee_yt 0:7766f6712673 72 ip_addr_set_any(&buf->toaddr);
yueee_yt 0:7766f6712673 73 #endif /* LWIP_NETBUF_RECVINFO */
yueee_yt 0:7766f6712673 74 #endif /* LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 75 return buf;
yueee_yt 0:7766f6712673 76 } else {
yueee_yt 0:7766f6712673 77 return NULL;
yueee_yt 0:7766f6712673 78 }
yueee_yt 0:7766f6712673 79 }
yueee_yt 0:7766f6712673 80
yueee_yt 0:7766f6712673 81 /**
yueee_yt 0:7766f6712673 82 * Deallocate a netbuf allocated by netbuf_new().
yueee_yt 0:7766f6712673 83 *
yueee_yt 0:7766f6712673 84 * @param buf pointer to a netbuf allocated by netbuf_new()
yueee_yt 0:7766f6712673 85 */
yueee_yt 0:7766f6712673 86 void
yueee_yt 0:7766f6712673 87 netbuf_delete(struct netbuf *buf)
yueee_yt 0:7766f6712673 88 {
yueee_yt 0:7766f6712673 89 if (buf != NULL) {
yueee_yt 0:7766f6712673 90 if (buf->p != NULL) {
yueee_yt 0:7766f6712673 91 pbuf_free(buf->p);
yueee_yt 0:7766f6712673 92 buf->p = buf->ptr = NULL;
yueee_yt 0:7766f6712673 93 }
yueee_yt 0:7766f6712673 94 memp_free(MEMP_NETBUF, buf);
yueee_yt 0:7766f6712673 95 }
yueee_yt 0:7766f6712673 96 }
yueee_yt 0:7766f6712673 97
yueee_yt 0:7766f6712673 98 /**
yueee_yt 0:7766f6712673 99 * Allocate memory for a packet buffer for a given netbuf.
yueee_yt 0:7766f6712673 100 *
yueee_yt 0:7766f6712673 101 * @param buf the netbuf for which to allocate a packet buffer
yueee_yt 0:7766f6712673 102 * @param size the size of the packet buffer to allocate
yueee_yt 0:7766f6712673 103 * @return pointer to the allocated memory
yueee_yt 0:7766f6712673 104 * NULL if no memory could be allocated
yueee_yt 0:7766f6712673 105 */
yueee_yt 0:7766f6712673 106 void *
yueee_yt 0:7766f6712673 107 netbuf_alloc(struct netbuf *buf, u16_t size)
yueee_yt 0:7766f6712673 108 {
yueee_yt 0:7766f6712673 109 LWIP_ERROR("netbuf_alloc: invalid buf", (buf != NULL), return NULL;);
yueee_yt 0:7766f6712673 110
yueee_yt 0:7766f6712673 111 /* Deallocate any previously allocated memory. */
yueee_yt 0:7766f6712673 112 if (buf->p != NULL) {
yueee_yt 0:7766f6712673 113 pbuf_free(buf->p);
yueee_yt 0:7766f6712673 114 }
yueee_yt 0:7766f6712673 115 buf->p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);
yueee_yt 0:7766f6712673 116 if (buf->p == NULL) {
yueee_yt 0:7766f6712673 117 return NULL;
yueee_yt 0:7766f6712673 118 }
yueee_yt 0:7766f6712673 119 LWIP_ASSERT("check that first pbuf can hold size",
yueee_yt 0:7766f6712673 120 (buf->p->len >= size));
yueee_yt 0:7766f6712673 121 buf->ptr = buf->p;
yueee_yt 0:7766f6712673 122 return buf->p->payload;
yueee_yt 0:7766f6712673 123 }
yueee_yt 0:7766f6712673 124
yueee_yt 0:7766f6712673 125 /**
yueee_yt 0:7766f6712673 126 * Free the packet buffer included in a netbuf
yueee_yt 0:7766f6712673 127 *
yueee_yt 0:7766f6712673 128 * @param buf pointer to the netbuf which contains the packet buffer to free
yueee_yt 0:7766f6712673 129 */
yueee_yt 0:7766f6712673 130 void
yueee_yt 0:7766f6712673 131 netbuf_free(struct netbuf *buf)
yueee_yt 0:7766f6712673 132 {
yueee_yt 0:7766f6712673 133 LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
yueee_yt 0:7766f6712673 134 if (buf->p != NULL) {
yueee_yt 0:7766f6712673 135 pbuf_free(buf->p);
yueee_yt 0:7766f6712673 136 }
yueee_yt 0:7766f6712673 137 buf->p = buf->ptr = NULL;
yueee_yt 0:7766f6712673 138 }
yueee_yt 0:7766f6712673 139
yueee_yt 0:7766f6712673 140 /**
yueee_yt 0:7766f6712673 141 * Let a netbuf reference existing (non-volatile) data.
yueee_yt 0:7766f6712673 142 *
yueee_yt 0:7766f6712673 143 * @param buf netbuf which should reference the data
yueee_yt 0:7766f6712673 144 * @param dataptr pointer to the data to reference
yueee_yt 0:7766f6712673 145 * @param size size of the data
yueee_yt 0:7766f6712673 146 * @return ERR_OK if data is referenced
yueee_yt 0:7766f6712673 147 * ERR_MEM if data couldn't be referenced due to lack of memory
yueee_yt 0:7766f6712673 148 */
yueee_yt 0:7766f6712673 149 err_t
yueee_yt 0:7766f6712673 150 netbuf_ref(struct netbuf *buf, const void *dataptr, u16_t size)
yueee_yt 0:7766f6712673 151 {
yueee_yt 0:7766f6712673 152 LWIP_ERROR("netbuf_ref: invalid buf", (buf != NULL), return ERR_ARG;);
yueee_yt 0:7766f6712673 153 if (buf->p != NULL) {
yueee_yt 0:7766f6712673 154 pbuf_free(buf->p);
yueee_yt 0:7766f6712673 155 }
yueee_yt 0:7766f6712673 156 buf->p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
yueee_yt 0:7766f6712673 157 if (buf->p == NULL) {
yueee_yt 0:7766f6712673 158 buf->ptr = NULL;
yueee_yt 0:7766f6712673 159 return ERR_MEM;
yueee_yt 0:7766f6712673 160 }
yueee_yt 0:7766f6712673 161 buf->p->payload = (void*)dataptr;
yueee_yt 0:7766f6712673 162 buf->p->len = buf->p->tot_len = size;
yueee_yt 0:7766f6712673 163 buf->ptr = buf->p;
yueee_yt 0:7766f6712673 164 return ERR_OK;
yueee_yt 0:7766f6712673 165 }
yueee_yt 0:7766f6712673 166
yueee_yt 0:7766f6712673 167 /**
yueee_yt 0:7766f6712673 168 * Chain one netbuf to another (@see pbuf_chain)
yueee_yt 0:7766f6712673 169 *
yueee_yt 0:7766f6712673 170 * @param head the first netbuf
yueee_yt 0:7766f6712673 171 * @param tail netbuf to chain after head, freed by this function, may not be reference after returning
yueee_yt 0:7766f6712673 172 */
yueee_yt 0:7766f6712673 173 void
yueee_yt 0:7766f6712673 174 netbuf_chain(struct netbuf *head, struct netbuf *tail)
yueee_yt 0:7766f6712673 175 {
yueee_yt 0:7766f6712673 176 LWIP_ERROR("netbuf_ref: invalid head", (head != NULL), return;);
yueee_yt 0:7766f6712673 177 LWIP_ERROR("netbuf_chain: invalid tail", (tail != NULL), return;);
yueee_yt 0:7766f6712673 178 pbuf_cat(head->p, tail->p);
yueee_yt 0:7766f6712673 179 head->ptr = head->p;
yueee_yt 0:7766f6712673 180 memp_free(MEMP_NETBUF, tail);
yueee_yt 0:7766f6712673 181 }
yueee_yt 0:7766f6712673 182
yueee_yt 0:7766f6712673 183 /**
yueee_yt 0:7766f6712673 184 * Get the data pointer and length of the data inside a netbuf.
yueee_yt 0:7766f6712673 185 *
yueee_yt 0:7766f6712673 186 * @param buf netbuf to get the data from
yueee_yt 0:7766f6712673 187 * @param dataptr pointer to a void pointer where to store the data pointer
yueee_yt 0:7766f6712673 188 * @param len pointer to an u16_t where the length of the data is stored
yueee_yt 0:7766f6712673 189 * @return ERR_OK if the information was retreived,
yueee_yt 0:7766f6712673 190 * ERR_BUF on error.
yueee_yt 0:7766f6712673 191 */
yueee_yt 0:7766f6712673 192 err_t
yueee_yt 0:7766f6712673 193 netbuf_data(struct netbuf *buf, void **dataptr, u16_t *len)
yueee_yt 0:7766f6712673 194 {
yueee_yt 0:7766f6712673 195 LWIP_ERROR("netbuf_data: invalid buf", (buf != NULL), return ERR_ARG;);
yueee_yt 0:7766f6712673 196 LWIP_ERROR("netbuf_data: invalid dataptr", (dataptr != NULL), return ERR_ARG;);
yueee_yt 0:7766f6712673 197 LWIP_ERROR("netbuf_data: invalid len", (len != NULL), return ERR_ARG;);
yueee_yt 0:7766f6712673 198
yueee_yt 0:7766f6712673 199 if (buf->ptr == NULL) {
yueee_yt 0:7766f6712673 200 return ERR_BUF;
yueee_yt 0:7766f6712673 201 }
yueee_yt 0:7766f6712673 202 *dataptr = buf->ptr->payload;
yueee_yt 0:7766f6712673 203 *len = buf->ptr->len;
yueee_yt 0:7766f6712673 204 return ERR_OK;
yueee_yt 0:7766f6712673 205 }
yueee_yt 0:7766f6712673 206
yueee_yt 0:7766f6712673 207 /**
yueee_yt 0:7766f6712673 208 * Move the current data pointer of a packet buffer contained in a netbuf
yueee_yt 0:7766f6712673 209 * to the next part.
yueee_yt 0:7766f6712673 210 * The packet buffer itself is not modified.
yueee_yt 0:7766f6712673 211 *
yueee_yt 0:7766f6712673 212 * @param buf the netbuf to modify
yueee_yt 0:7766f6712673 213 * @return -1 if there is no next part
yueee_yt 0:7766f6712673 214 * 1 if moved to the next part but now there is no next part
yueee_yt 0:7766f6712673 215 * 0 if moved to the next part and there are still more parts
yueee_yt 0:7766f6712673 216 */
yueee_yt 0:7766f6712673 217 s8_t
yueee_yt 0:7766f6712673 218 netbuf_next(struct netbuf *buf)
yueee_yt 0:7766f6712673 219 {
yueee_yt 0:7766f6712673 220 LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return -1;);
yueee_yt 0:7766f6712673 221 if (buf->ptr->next == NULL) {
yueee_yt 0:7766f6712673 222 return -1;
yueee_yt 0:7766f6712673 223 }
yueee_yt 0:7766f6712673 224 buf->ptr = buf->ptr->next;
yueee_yt 0:7766f6712673 225 if (buf->ptr->next == NULL) {
yueee_yt 0:7766f6712673 226 return 1;
yueee_yt 0:7766f6712673 227 }
yueee_yt 0:7766f6712673 228 return 0;
yueee_yt 0:7766f6712673 229 }
yueee_yt 0:7766f6712673 230
yueee_yt 0:7766f6712673 231 /**
yueee_yt 0:7766f6712673 232 * Move the current data pointer of a packet buffer contained in a netbuf
yueee_yt 0:7766f6712673 233 * to the beginning of the packet.
yueee_yt 0:7766f6712673 234 * The packet buffer itself is not modified.
yueee_yt 0:7766f6712673 235 *
yueee_yt 0:7766f6712673 236 * @param buf the netbuf to modify
yueee_yt 0:7766f6712673 237 */
yueee_yt 0:7766f6712673 238 void
yueee_yt 0:7766f6712673 239 netbuf_first(struct netbuf *buf)
yueee_yt 0:7766f6712673 240 {
yueee_yt 0:7766f6712673 241 LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
yueee_yt 0:7766f6712673 242 buf->ptr = buf->p;
yueee_yt 0:7766f6712673 243 }
yueee_yt 0:7766f6712673 244
yueee_yt 0:7766f6712673 245 #endif /* LWIP_NETCONN */