UDPtest - Some quick code to use UDP-only (no TCP) with mBe…

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Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed

Core/lwIP/netif/ethernetif.c@0:a548a085de55, 2010-03-14 (annotated)

Committer:: pehrhovey
Date:: Sun Mar 14 00:54:12 2010 +0000
Revision:: 0:a548a085de55

Who changed what in which revision?

User	Revision	Line number	New contents of line
pehrhovey	0:a548a085de55	1	/**
pehrhovey	0:a548a085de55	2	* @file
pehrhovey	0:a548a085de55	3	* Ethernet Interface Skeleton
pehrhovey	0:a548a085de55	4	*
pehrhovey	0:a548a085de55	5	*/
pehrhovey	0:a548a085de55	6
pehrhovey	0:a548a085de55	7	/*
pehrhovey	0:a548a085de55	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
pehrhovey	0:a548a085de55	9	* All rights reserved.
pehrhovey	0:a548a085de55	10	*
pehrhovey	0:a548a085de55	11	* Redistribution and use in source and binary forms, with or without modification,
pehrhovey	0:a548a085de55	12	* are permitted provided that the following conditions are met:
pehrhovey	0:a548a085de55	13	*
pehrhovey	0:a548a085de55	14	* 1. Redistributions of source code must retain the above copyright notice,
pehrhovey	0:a548a085de55	15	* this list of conditions and the following disclaimer.
pehrhovey	0:a548a085de55	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
pehrhovey	0:a548a085de55	17	* this list of conditions and the following disclaimer in the documentation
pehrhovey	0:a548a085de55	18	* and/or other materials provided with the distribution.
pehrhovey	0:a548a085de55	19	* 3. The name of the author may not be used to endorse or promote products
pehrhovey	0:a548a085de55	20	* derived from this software without specific prior written permission.
pehrhovey	0:a548a085de55	21	*
pehrhovey	0:a548a085de55	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
pehrhovey	0:a548a085de55	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
pehrhovey	0:a548a085de55	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
pehrhovey	0:a548a085de55	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
pehrhovey	0:a548a085de55	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
pehrhovey	0:a548a085de55	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
pehrhovey	0:a548a085de55	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
pehrhovey	0:a548a085de55	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
pehrhovey	0:a548a085de55	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
pehrhovey	0:a548a085de55	31	* OF SUCH DAMAGE.
pehrhovey	0:a548a085de55	32	*
pehrhovey	0:a548a085de55	33	* This file is part of the lwIP TCP/IP stack.
pehrhovey	0:a548a085de55	34	*
pehrhovey	0:a548a085de55	35	* Author: Adam Dunkels <adam@sics.se>
pehrhovey	0:a548a085de55	36	*
pehrhovey	0:a548a085de55	37	*/
pehrhovey	0:a548a085de55	38
pehrhovey	0:a548a085de55	39	/*
pehrhovey	0:a548a085de55	40	* This file is a skeleton for developing Ethernet network interface
pehrhovey	0:a548a085de55	41	* drivers for lwIP. Add code to the low_level functions and do a
pehrhovey	0:a548a085de55	42	* search-and-replace for the word "ethernetif" to replace it with
pehrhovey	0:a548a085de55	43	* something that better describes your network interface.
pehrhovey	0:a548a085de55	44	*/
pehrhovey	0:a548a085de55	45
pehrhovey	0:a548a085de55	46	#include "lwip/opt.h"
pehrhovey	0:a548a085de55	47
pehrhovey	0:a548a085de55	48	#if 0 /* don't build, this is only a skeleton, see previous comment */
pehrhovey	0:a548a085de55	49
pehrhovey	0:a548a085de55	50	#include "lwip/def.h"
pehrhovey	0:a548a085de55	51	#include "lwip/mem.h"
pehrhovey	0:a548a085de55	52	#include "lwip/pbuf.h"
pehrhovey	0:a548a085de55	53	#include "lwip/sys.h"
pehrhovey	0:a548a085de55	54	#include <lwip/stats.h>
pehrhovey	0:a548a085de55	55	#include <lwip/snmp.h>
pehrhovey	0:a548a085de55	56	#include "netif/etharp.h"
pehrhovey	0:a548a085de55	57	#include "netif/ppp_oe.h"
pehrhovey	0:a548a085de55	58
pehrhovey	0:a548a085de55	59	/* Define those to better describe your network interface. */
pehrhovey	0:a548a085de55	60	#define IFNAME0 'e'
pehrhovey	0:a548a085de55	61	#define IFNAME1 'n'
pehrhovey	0:a548a085de55	62
pehrhovey	0:a548a085de55	63	/**
pehrhovey	0:a548a085de55	64	* Helper struct to hold private data used to operate your ethernet interface.
pehrhovey	0:a548a085de55	65	* Keeping the ethernet address of the MAC in this struct is not necessary
pehrhovey	0:a548a085de55	66	* as it is already kept in the struct netif.
pehrhovey	0:a548a085de55	67	* But this is only an example, anyway...
pehrhovey	0:a548a085de55	68	*/
pehrhovey	0:a548a085de55	69	struct ethernetif {
pehrhovey	0:a548a085de55	70	struct eth_addr *ethaddr;
pehrhovey	0:a548a085de55	71	/* Add whatever per-interface state that is needed here. */
pehrhovey	0:a548a085de55	72	};
pehrhovey	0:a548a085de55	73
pehrhovey	0:a548a085de55	74	/* Forward declarations. */
pehrhovey	0:a548a085de55	75	static void ethernetif_input(struct netif *netif);
pehrhovey	0:a548a085de55	76
pehrhovey	0:a548a085de55	77	/**
pehrhovey	0:a548a085de55	78	* In this function, the hardware should be initialized.
pehrhovey	0:a548a085de55	79	* Called from ethernetif_init().
pehrhovey	0:a548a085de55	80	*
pehrhovey	0:a548a085de55	81	* @param netif the already initialized lwip network interface structure
pehrhovey	0:a548a085de55	82	* for this ethernetif
pehrhovey	0:a548a085de55	83	*/
pehrhovey	0:a548a085de55	84	static void
pehrhovey	0:a548a085de55	85	low_level_init(struct netif *netif)
pehrhovey	0:a548a085de55	86	{
pehrhovey	0:a548a085de55	87	struct ethernetif *ethernetif = netif->state;
pehrhovey	0:a548a085de55	88
pehrhovey	0:a548a085de55	89	/* set MAC hardware address length */
pehrhovey	0:a548a085de55	90	netif->hwaddr_len = ETHARP_HWADDR_LEN;
pehrhovey	0:a548a085de55	91
pehrhovey	0:a548a085de55	92	/* set MAC hardware address */
pehrhovey	0:a548a085de55	93	netif->hwaddr[0] = ;
pehrhovey	0:a548a085de55	94	...
pehrhovey	0:a548a085de55	95	netif->hwaddr[5] = ;
pehrhovey	0:a548a085de55	96
pehrhovey	0:a548a085de55	97	/* maximum transfer unit */
pehrhovey	0:a548a085de55	98	netif->mtu = 1500;
pehrhovey	0:a548a085de55	99
pehrhovey	0:a548a085de55	100	/* device capabilities */
pehrhovey	0:a548a085de55	101	/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
pehrhovey	0:a548a085de55	102	netif->flags = NETIF_FLAG_BROADCAST \| NETIF_FLAG_ETHARP \| NETIF_FLAG_LINK_UP;
pehrhovey	0:a548a085de55	103
pehrhovey	0:a548a085de55	104	/* Do whatever else is needed to initialize interface. */
pehrhovey	0:a548a085de55	105	}
pehrhovey	0:a548a085de55	106
pehrhovey	0:a548a085de55	107	/**
pehrhovey	0:a548a085de55	108	* This function should do the actual transmission of the packet. The packet is
pehrhovey	0:a548a085de55	109	* contained in the pbuf that is passed to the function. This pbuf
pehrhovey	0:a548a085de55	110	* might be chained.
pehrhovey	0:a548a085de55	111	*
pehrhovey	0:a548a085de55	112	* @param netif the lwip network interface structure for this ethernetif
pehrhovey	0:a548a085de55	113	* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
pehrhovey	0:a548a085de55	114	* @return ERR_OK if the packet could be sent
pehrhovey	0:a548a085de55	115	* an err_t value if the packet couldn't be sent
pehrhovey	0:a548a085de55	116	*
pehrhovey	0:a548a085de55	117	* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
pehrhovey	0:a548a085de55	118	* strange results. You might consider waiting for space in the DMA queue
pehrhovey	0:a548a085de55	119	* to become availale since the stack doesn't retry to send a packet
pehrhovey	0:a548a085de55	120	* dropped because of memory failure (except for the TCP timers).
pehrhovey	0:a548a085de55	121	*/
pehrhovey	0:a548a085de55	122
pehrhovey	0:a548a085de55	123	static err_t
pehrhovey	0:a548a085de55	124	low_level_output(struct netif netif, struct pbuf p)
pehrhovey	0:a548a085de55	125	{
pehrhovey	0:a548a085de55	126	struct ethernetif *ethernetif = netif->state;
pehrhovey	0:a548a085de55	127	struct pbuf *q;
pehrhovey	0:a548a085de55	128
pehrhovey	0:a548a085de55	129	initiate transfer();
pehrhovey	0:a548a085de55	130
pehrhovey	0:a548a085de55	131	#if ETH_PAD_SIZE
pehrhovey	0:a548a085de55	132	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
pehrhovey	0:a548a085de55	133	#endif
pehrhovey	0:a548a085de55	134
pehrhovey	0:a548a085de55	135	for(q = p; q != NULL; q = q->next) {
pehrhovey	0:a548a085de55	136	/* Send the data from the pbuf to the interface, one pbuf at a
pehrhovey	0:a548a085de55	137	time. The size of the data in each pbuf is kept in the ->len
pehrhovey	0:a548a085de55	138	variable. */
pehrhovey	0:a548a085de55	139	send data from(q->payload, q->len);
pehrhovey	0:a548a085de55	140	}
pehrhovey	0:a548a085de55	141
pehrhovey	0:a548a085de55	142	signal that packet should be sent();
pehrhovey	0:a548a085de55	143
pehrhovey	0:a548a085de55	144	#if ETH_PAD_SIZE
pehrhovey	0:a548a085de55	145	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
pehrhovey	0:a548a085de55	146	#endif
pehrhovey	0:a548a085de55	147
pehrhovey	0:a548a085de55	148	LINK_STATS_INC(link.xmit);
pehrhovey	0:a548a085de55	149
pehrhovey	0:a548a085de55	150	return ERR_OK;
pehrhovey	0:a548a085de55	151	}
pehrhovey	0:a548a085de55	152
pehrhovey	0:a548a085de55	153	/**
pehrhovey	0:a548a085de55	154	* Should allocate a pbuf and transfer the bytes of the incoming
pehrhovey	0:a548a085de55	155	* packet from the interface into the pbuf.
pehrhovey	0:a548a085de55	156	*
pehrhovey	0:a548a085de55	157	* @param netif the lwip network interface structure for this ethernetif
pehrhovey	0:a548a085de55	158	* @return a pbuf filled with the received packet (including MAC header)
pehrhovey	0:a548a085de55	159	* NULL on memory error
pehrhovey	0:a548a085de55	160	*/
pehrhovey	0:a548a085de55	161	static struct pbuf *
pehrhovey	0:a548a085de55	162	low_level_input(struct netif *netif)
pehrhovey	0:a548a085de55	163	{
pehrhovey	0:a548a085de55	164	struct ethernetif *ethernetif = netif->state;
pehrhovey	0:a548a085de55	165	struct pbuf p, q;
pehrhovey	0:a548a085de55	166	u16_t len;
pehrhovey	0:a548a085de55	167
pehrhovey	0:a548a085de55	168	/* Obtain the size of the packet and put it into the "len"
pehrhovey	0:a548a085de55	169	variable. */
pehrhovey	0:a548a085de55	170	len = ;
pehrhovey	0:a548a085de55	171
pehrhovey	0:a548a085de55	172	#if ETH_PAD_SIZE
pehrhovey	0:a548a085de55	173	len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
pehrhovey	0:a548a085de55	174	#endif
pehrhovey	0:a548a085de55	175
pehrhovey	0:a548a085de55	176	/* We allocate a pbuf chain of pbufs from the pool. */
pehrhovey	0:a548a085de55	177	p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
pehrhovey	0:a548a085de55	178
pehrhovey	0:a548a085de55	179	if (p != NULL) {
pehrhovey	0:a548a085de55	180
pehrhovey	0:a548a085de55	181	#if ETH_PAD_SIZE
pehrhovey	0:a548a085de55	182	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
pehrhovey	0:a548a085de55	183	#endif
pehrhovey	0:a548a085de55	184
pehrhovey	0:a548a085de55	185	/* We iterate over the pbuf chain until we have read the entire
pehrhovey	0:a548a085de55	186	* packet into the pbuf. */
pehrhovey	0:a548a085de55	187	for(q = p; q != NULL; q = q->next) {
pehrhovey	0:a548a085de55	188	/* Read enough bytes to fill this pbuf in the chain. The
pehrhovey	0:a548a085de55	189	* available data in the pbuf is given by the q->len
pehrhovey	0:a548a085de55	190	* variable.
pehrhovey	0:a548a085de55	191	* This does not necessarily have to be a memcpy, you can also preallocate
pehrhovey	0:a548a085de55	192	* pbufs for a DMA-enabled MAC and after receiving truncate it to the
pehrhovey	0:a548a085de55	193	* actually received size. In this case, ensure the tot_len member of the
pehrhovey	0:a548a085de55	194	* pbuf is the sum of the chained pbuf len members.
pehrhovey	0:a548a085de55	195	*/
pehrhovey	0:a548a085de55	196	read data into(q->payload, q->len);
pehrhovey	0:a548a085de55	197	}
pehrhovey	0:a548a085de55	198	acknowledge that packet has been read();
pehrhovey	0:a548a085de55	199
pehrhovey	0:a548a085de55	200	#if ETH_PAD_SIZE
pehrhovey	0:a548a085de55	201	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
pehrhovey	0:a548a085de55	202	#endif
pehrhovey	0:a548a085de55	203
pehrhovey	0:a548a085de55	204	LINK_STATS_INC(link.recv);
pehrhovey	0:a548a085de55	205	} else {
pehrhovey	0:a548a085de55	206	drop packet();
pehrhovey	0:a548a085de55	207	LINK_STATS_INC(link.memerr);
pehrhovey	0:a548a085de55	208	LINK_STATS_INC(link.drop);
pehrhovey	0:a548a085de55	209	}
pehrhovey	0:a548a085de55	210
pehrhovey	0:a548a085de55	211	return p;
pehrhovey	0:a548a085de55	212	}
pehrhovey	0:a548a085de55	213
pehrhovey	0:a548a085de55	214	/**
pehrhovey	0:a548a085de55	215	* This function should be called when a packet is ready to be read
pehrhovey	0:a548a085de55	216	* from the interface. It uses the function low_level_input() that
pehrhovey	0:a548a085de55	217	* should handle the actual reception of bytes from the network
pehrhovey	0:a548a085de55	218	* interface. Then the type of the received packet is determined and
pehrhovey	0:a548a085de55	219	* the appropriate input function is called.
pehrhovey	0:a548a085de55	220	*
pehrhovey	0:a548a085de55	221	* @param netif the lwip network interface structure for this ethernetif
pehrhovey	0:a548a085de55	222	*/
pehrhovey	0:a548a085de55	223	static void
pehrhovey	0:a548a085de55	224	ethernetif_input(struct netif *netif)
pehrhovey	0:a548a085de55	225	{
pehrhovey	0:a548a085de55	226	struct ethernetif *ethernetif;
pehrhovey	0:a548a085de55	227	struct eth_hdr *ethhdr;
pehrhovey	0:a548a085de55	228	struct pbuf *p;
pehrhovey	0:a548a085de55	229
pehrhovey	0:a548a085de55	230	ethernetif = netif->state;
pehrhovey	0:a548a085de55	231
pehrhovey	0:a548a085de55	232	/* move received packet into a new pbuf */
pehrhovey	0:a548a085de55	233	p = low_level_input(netif);
pehrhovey	0:a548a085de55	234	/* no packet could be read, silently ignore this */
pehrhovey	0:a548a085de55	235	if (p == NULL) return;
pehrhovey	0:a548a085de55	236	/* points to packet payload, which starts with an Ethernet header */
pehrhovey	0:a548a085de55	237	ethhdr = p->payload;
pehrhovey	0:a548a085de55	238
pehrhovey	0:a548a085de55	239	switch (htons(ethhdr->type)) {
pehrhovey	0:a548a085de55	240	/* IP or ARP packet? */
pehrhovey	0:a548a085de55	241	case ETHTYPE_IP:
pehrhovey	0:a548a085de55	242	case ETHTYPE_ARP:
pehrhovey	0:a548a085de55	243	#if PPPOE_SUPPORT
pehrhovey	0:a548a085de55	244	/* PPPoE packet? */
pehrhovey	0:a548a085de55	245	case ETHTYPE_PPPOEDISC:
pehrhovey	0:a548a085de55	246	case ETHTYPE_PPPOE:
pehrhovey	0:a548a085de55	247	#endif /* PPPOE_SUPPORT */
pehrhovey	0:a548a085de55	248	/* full packet send to tcpip_thread to process */
pehrhovey	0:a548a085de55	249	if (netif->input(p, netif)!=ERR_OK)
pehrhovey	0:a548a085de55	250	{ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
pehrhovey	0:a548a085de55	251	pbuf_free(p);
pehrhovey	0:a548a085de55	252	p = NULL;
pehrhovey	0:a548a085de55	253	}
pehrhovey	0:a548a085de55	254	break;
pehrhovey	0:a548a085de55	255
pehrhovey	0:a548a085de55	256	default:
pehrhovey	0:a548a085de55	257	pbuf_free(p);
pehrhovey	0:a548a085de55	258	p = NULL;
pehrhovey	0:a548a085de55	259	break;
pehrhovey	0:a548a085de55	260	}
pehrhovey	0:a548a085de55	261	}
pehrhovey	0:a548a085de55	262
pehrhovey	0:a548a085de55	263	/**
pehrhovey	0:a548a085de55	264	* Should be called at the beginning of the program to set up the
pehrhovey	0:a548a085de55	265	* network interface. It calls the function low_level_init() to do the
pehrhovey	0:a548a085de55	266	* actual setup of the hardware.
pehrhovey	0:a548a085de55	267	*
pehrhovey	0:a548a085de55	268	* This function should be passed as a parameter to netif_add().
pehrhovey	0:a548a085de55	269	*
pehrhovey	0:a548a085de55	270	* @param netif the lwip network interface structure for this ethernetif
pehrhovey	0:a548a085de55	271	* @return ERR_OK if the loopif is initialized
pehrhovey	0:a548a085de55	272	* ERR_MEM if private data couldn't be allocated
pehrhovey	0:a548a085de55	273	* any other err_t on error
pehrhovey	0:a548a085de55	274	*/
pehrhovey	0:a548a085de55	275	err_t
pehrhovey	0:a548a085de55	276	ethernetif_init(struct netif *netif)
pehrhovey	0:a548a085de55	277	{
pehrhovey	0:a548a085de55	278	struct ethernetif *ethernetif;
pehrhovey	0:a548a085de55	279
pehrhovey	0:a548a085de55	280	LWIP_ASSERT("netif != NULL", (netif != NULL));
pehrhovey	0:a548a085de55	281
pehrhovey	0:a548a085de55	282	ethernetif = mem_malloc(sizeof(struct ethernetif));
pehrhovey	0:a548a085de55	283	if (ethernetif == NULL) {
pehrhovey	0:a548a085de55	284	LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
pehrhovey	0:a548a085de55	285	return ERR_MEM;
pehrhovey	0:a548a085de55	286	}
pehrhovey	0:a548a085de55	287
pehrhovey	0:a548a085de55	288	#if LWIP_NETIF_HOSTNAME
pehrhovey	0:a548a085de55	289	/* Initialize interface hostname */
pehrhovey	0:a548a085de55	290	netif->hostname = "lwip";
pehrhovey	0:a548a085de55	291	#endif /* LWIP_NETIF_HOSTNAME */
pehrhovey	0:a548a085de55	292
pehrhovey	0:a548a085de55	293	/*
pehrhovey	0:a548a085de55	294	* Initialize the snmp variables and counters inside the struct netif.
pehrhovey	0:a548a085de55	295	* The last argument should be replaced with your link speed, in units
pehrhovey	0:a548a085de55	296	* of bits per second.
pehrhovey	0:a548a085de55	297	*/
pehrhovey	0:a548a085de55	298	NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
pehrhovey	0:a548a085de55	299
pehrhovey	0:a548a085de55	300	netif->state = ethernetif;
pehrhovey	0:a548a085de55	301	netif->name[0] = IFNAME0;
pehrhovey	0:a548a085de55	302	netif->name[1] = IFNAME1;
pehrhovey	0:a548a085de55	303	/* We directly use etharp_output() here to save a function call.
pehrhovey	0:a548a085de55	304	* You can instead declare your own function an call etharp_output()
pehrhovey	0:a548a085de55	305	* from it if you have to do some checks before sending (e.g. if link
pehrhovey	0:a548a085de55	306	* is available...) */
pehrhovey	0:a548a085de55	307	netif->output = etharp_output;
pehrhovey	0:a548a085de55	308	netif->linkoutput = low_level_output;
pehrhovey	0:a548a085de55	309
pehrhovey	0:a548a085de55	310	ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
pehrhovey	0:a548a085de55	311
pehrhovey	0:a548a085de55	312	/* initialize the hardware */
pehrhovey	0:a548a085de55	313	low_level_init(netif);
pehrhovey	0:a548a085de55	314
pehrhovey	0:a548a085de55	315	return ERR_OK;
pehrhovey	0:a548a085de55	316	}
pehrhovey	0:a548a085de55	317
pehrhovey	0:a548a085de55	318	#endif /* 0 */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	14 Mar 2010
Imports:	240
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	5

Core/lwIP/netif/ethernetif.c@0:a548a085de55, 2010-03-14 (annotated)

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