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lwip/include/lwip/api.h@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

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User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1	/*
mbed714	0:d616ece2d859	2	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed714	0:d616ece2d859	3	* All rights reserved.
mbed714	0:d616ece2d859	4	*
mbed714	0:d616ece2d859	5	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:d616ece2d859	6	* are permitted provided that the following conditions are met:
mbed714	0:d616ece2d859	7	*
mbed714	0:d616ece2d859	8	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:d616ece2d859	9	* this list of conditions and the following disclaimer.
mbed714	0:d616ece2d859	10	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:d616ece2d859	11	* this list of conditions and the following disclaimer in the documentation
mbed714	0:d616ece2d859	12	* and/or other materials provided with the distribution.
mbed714	0:d616ece2d859	13	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:d616ece2d859	14	* derived from this software without specific prior written permission.
mbed714	0:d616ece2d859	15	*
mbed714	0:d616ece2d859	16	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:d616ece2d859	17	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:d616ece2d859	18	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:d616ece2d859	19	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:d616ece2d859	20	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:d616ece2d859	21	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:d616ece2d859	22	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:d616ece2d859	23	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:d616ece2d859	24	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:d616ece2d859	25	* OF SUCH DAMAGE.
mbed714	0:d616ece2d859	26	*
mbed714	0:d616ece2d859	27	* This file is part of the lwIP TCP/IP stack.
mbed714	0:d616ece2d859	28	*
mbed714	0:d616ece2d859	29	* Author: Adam Dunkels <adam@sics.se>
mbed714	0:d616ece2d859	30	*
mbed714	0:d616ece2d859	31	*/
mbed714	0:d616ece2d859	32	#ifndef __LWIP_API_H__
mbed714	0:d616ece2d859	33	#define __LWIP_API_H__
mbed714	0:d616ece2d859	34
mbed714	0:d616ece2d859	35	#include "lwip/opt.h"
mbed714	0:d616ece2d859	36
mbed714	0:d616ece2d859	37	#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
mbed714	0:d616ece2d859	38
mbed714	0:d616ece2d859	39	#include <stddef.h> /* for size_t */
mbed714	0:d616ece2d859	40
mbed714	0:d616ece2d859	41	#include "lwip/netbuf.h"
mbed714	0:d616ece2d859	42	#include "lwip/sys.h"
mbed714	0:d616ece2d859	43	#include "lwip/ip_addr.h"
mbed714	0:d616ece2d859	44	#include "lwip/err.h"
mbed714	0:d616ece2d859	45
mbed714	0:d616ece2d859	46	#ifdef __cplusplus
mbed714	0:d616ece2d859	47	extern "C" {
mbed714	0:d616ece2d859	48	#endif
mbed714	0:d616ece2d859	49
mbed714	0:d616ece2d859	50	/* Throughout this file, IP addresses and port numbers are expected to be in
mbed714	0:d616ece2d859	51	* the same byte order as in the corresponding pcb.
mbed714	0:d616ece2d859	52	*/
mbed714	0:d616ece2d859	53
mbed714	0:d616ece2d859	54	/* Flags for netconn_write (u8_t) */
mbed714	0:d616ece2d859	55	#define NETCONN_NOFLAG 0x00
mbed714	0:d616ece2d859	56	#define NETCONN_NOCOPY 0x00 /* Only for source code compatibility */
mbed714	0:d616ece2d859	57	#define NETCONN_COPY 0x01
mbed714	0:d616ece2d859	58	#define NETCONN_MORE 0x02
mbed714	0:d616ece2d859	59	#define NETCONN_DONTBLOCK 0x04
mbed714	0:d616ece2d859	60
mbed714	0:d616ece2d859	61	/* Flags for struct netconn.flags (u8_t) */
mbed714	0:d616ece2d859	62	/** TCP: when data passed to netconn_write doesn't fit into the send buffer,
mbed714	0:d616ece2d859	63	this temporarily stores whether to wake up the original application task
mbed714	0:d616ece2d859	64	if data couldn't be sent in the first try. */
mbed714	0:d616ece2d859	65	#define NETCONN_FLAG_WRITE_DELAYED 0x01
mbed714	0:d616ece2d859	66	/** Should this netconn avoid blocking? */
mbed714	0:d616ece2d859	67	#define NETCONN_FLAG_NON_BLOCKING 0x02
mbed714	0:d616ece2d859	68	/** Was the last connect action a non-blocking one? */
mbed714	0:d616ece2d859	69	#define NETCONN_FLAG_IN_NONBLOCKING_CONNECT 0x04
mbed714	0:d616ece2d859	70	/** If this is set, a TCP netconn must call netconn_recved() to update
mbed714	0:d616ece2d859	71	the TCP receive window (done automatically if not set). */
mbed714	0:d616ece2d859	72	#define NETCONN_FLAG_NO_AUTO_RECVED 0x08
mbed714	0:d616ece2d859	73	/** If a nonblocking write has been rejected before, poll_tcp needs to
mbed714	0:d616ece2d859	74	check if the netconn is writable again */
mbed714	0:d616ece2d859	75	#define NETCONN_FLAG_CHECK_WRITESPACE 0x10
mbed714	0:d616ece2d859	76
mbed714	0:d616ece2d859	77
mbed714	0:d616ece2d859	78	/* Helpers to process several netconn_types by the same code */
mbed714	0:d616ece2d859	79	#define NETCONNTYPE_GROUP(t) (t&0xF0)
mbed714	0:d616ece2d859	80	#define NETCONNTYPE_DATAGRAM(t) (t&0xE0)
mbed714	0:d616ece2d859	81
mbed714	0:d616ece2d859	82	/** Protocol family and type of the netconn */
mbed714	0:d616ece2d859	83	enum netconn_type {
mbed714	0:d616ece2d859	84	NETCONN_INVALID = 0,
mbed714	0:d616ece2d859	85	/* NETCONN_TCP Group */
mbed714	0:d616ece2d859	86	NETCONN_TCP = 0x10,
mbed714	0:d616ece2d859	87	/* NETCONN_UDP Group */
mbed714	0:d616ece2d859	88	NETCONN_UDP = 0x20,
mbed714	0:d616ece2d859	89	NETCONN_UDPLITE = 0x21,
mbed714	0:d616ece2d859	90	NETCONN_UDPNOCHKSUM= 0x22,
mbed714	0:d616ece2d859	91	/* NETCONN_RAW Group */
mbed714	0:d616ece2d859	92	NETCONN_RAW = 0x40
mbed714	0:d616ece2d859	93	};
mbed714	0:d616ece2d859	94
mbed714	0:d616ece2d859	95	/** Current state of the netconn. Non-TCP netconns are always
mbed714	0:d616ece2d859	96	* in state NETCONN_NONE! */
mbed714	0:d616ece2d859	97	enum netconn_state {
mbed714	0:d616ece2d859	98	NETCONN_NONE,
mbed714	0:d616ece2d859	99	NETCONN_WRITE,
mbed714	0:d616ece2d859	100	NETCONN_LISTEN,
mbed714	0:d616ece2d859	101	NETCONN_CONNECT,
mbed714	0:d616ece2d859	102	NETCONN_CLOSE
mbed714	0:d616ece2d859	103	};
mbed714	0:d616ece2d859	104
mbed714	0:d616ece2d859	105	/** Use to inform the callback function about changes */
mbed714	0:d616ece2d859	106	enum netconn_evt {
mbed714	0:d616ece2d859	107	NETCONN_EVT_RCVPLUS,
mbed714	0:d616ece2d859	108	NETCONN_EVT_RCVMINUS,
mbed714	0:d616ece2d859	109	NETCONN_EVT_SENDPLUS,
mbed714	0:d616ece2d859	110	NETCONN_EVT_SENDMINUS,
mbed714	0:d616ece2d859	111	NETCONN_EVT_ERROR
mbed714	0:d616ece2d859	112	};
mbed714	0:d616ece2d859	113
mbed714	0:d616ece2d859	114	#if LWIP_IGMP
mbed714	0:d616ece2d859	115	/** Used for netconn_join_leave_group() */
mbed714	0:d616ece2d859	116	enum netconn_igmp {
mbed714	0:d616ece2d859	117	NETCONN_JOIN,
mbed714	0:d616ece2d859	118	NETCONN_LEAVE
mbed714	0:d616ece2d859	119	};
mbed714	0:d616ece2d859	120	#endif /* LWIP_IGMP */
mbed714	0:d616ece2d859	121
mbed714	0:d616ece2d859	122	/* forward-declare some structs to avoid to include their headers */
mbed714	0:d616ece2d859	123	struct ip_pcb;
mbed714	0:d616ece2d859	124	struct tcp_pcb;
mbed714	0:d616ece2d859	125	struct udp_pcb;
mbed714	0:d616ece2d859	126	struct raw_pcb;
mbed714	0:d616ece2d859	127	struct netconn;
mbed714	0:d616ece2d859	128	struct api_msg_msg;
mbed714	0:d616ece2d859	129
mbed714	0:d616ece2d859	130	/** A callback prototype to inform about events for a netconn */
mbed714	0:d616ece2d859	131	typedef void (* netconn_callback)(struct netconn *, enum netconn_evt, u16_t len);
mbed714	0:d616ece2d859	132
mbed714	0:d616ece2d859	133	/** A netconn descriptor */
mbed714	0:d616ece2d859	134	struct netconn {
mbed714	0:d616ece2d859	135	/** type of the netconn (TCP, UDP or RAW) */
mbed714	0:d616ece2d859	136	enum netconn_type type;
mbed714	0:d616ece2d859	137	/** current state of the netconn */
mbed714	0:d616ece2d859	138	enum netconn_state state;
mbed714	0:d616ece2d859	139	/** the lwIP internal protocol control block */
mbed714	0:d616ece2d859	140	union {
mbed714	0:d616ece2d859	141	struct ip_pcb *ip;
mbed714	0:d616ece2d859	142	struct tcp_pcb *tcp;
mbed714	0:d616ece2d859	143	struct udp_pcb *udp;
mbed714	0:d616ece2d859	144	struct raw_pcb *raw;
mbed714	0:d616ece2d859	145	} pcb;
mbed714	0:d616ece2d859	146	/** the last error this netconn had */
mbed714	0:d616ece2d859	147	err_t last_err;
mbed714	0:d616ece2d859	148	/** sem that is used to synchroneously execute functions in the core context */
mbed714	0:d616ece2d859	149	sys_sem_t op_completed;
mbed714	0:d616ece2d859	150	/** mbox where received packets are stored until they are fetched
mbed714	0:d616ece2d859	151	by the netconn application thread (can grow quite big) */
mbed714	0:d616ece2d859	152	sys_mbox_t recvmbox;
mbed714	0:d616ece2d859	153	#if LWIP_TCP
mbed714	0:d616ece2d859	154	/** mbox where new connections are stored until processed
mbed714	0:d616ece2d859	155	by the application thread */
mbed714	0:d616ece2d859	156	sys_mbox_t acceptmbox;
mbed714	0:d616ece2d859	157	#endif /* LWIP_TCP */
mbed714	0:d616ece2d859	158	/** only used for socket layer */
mbed714	0:d616ece2d859	159	#if LWIP_SOCKET
mbed714	0:d616ece2d859	160	int socket;
mbed714	0:d616ece2d859	161	#endif /* LWIP_SOCKET */
mbed714	0:d616ece2d859	162	#if LWIP_SO_RCVTIMEO
mbed714	0:d616ece2d859	163	/** timeout to wait for new data to be received
mbed714	0:d616ece2d859	164	(or connections to arrive for listening netconns) */
mbed714	0:d616ece2d859	165	int recv_timeout;
mbed714	0:d616ece2d859	166	#endif /* LWIP_SO_RCVTIMEO */
mbed714	0:d616ece2d859	167	#if LWIP_SO_RCVBUF
mbed714	0:d616ece2d859	168	/** maximum amount of bytes queued in recvmbox
mbed714	0:d616ece2d859	169	not used for TCP: adjust TCP_WND instead! */
mbed714	0:d616ece2d859	170	int recv_bufsize;
mbed714	0:d616ece2d859	171	#endif /* LWIP_SO_RCVBUF */
mbed714	0:d616ece2d859	172	/** number of bytes currently in recvmbox to be received,
mbed714	0:d616ece2d859	173	tested against recv_bufsize to limit bytes on recvmbox
mbed714	0:d616ece2d859	174	for UDP and RAW
mbed714	0:d616ece2d859	175	@todo: should only be necessary with LWIP_SO_RCVBUF==1 */
mbed714	0:d616ece2d859	176	s16_t recv_avail;
mbed714	0:d616ece2d859	177	/** flags holding more netconn-internal state, see NETCONN_FLAG_* defines */
mbed714	0:d616ece2d859	178	u8_t flags;
mbed714	0:d616ece2d859	179	#if LWIP_TCP
mbed714	0:d616ece2d859	180	/** TCP: when data passed to netconn_write doesn't fit into the send buffer,
mbed714	0:d616ece2d859	181	this temporarily stores how much is already sent. */
mbed714	0:d616ece2d859	182	size_t write_offset;
mbed714	0:d616ece2d859	183	/** TCP: when data passed to netconn_write doesn't fit into the send buffer,
mbed714	0:d616ece2d859	184	this temporarily stores the message.
mbed714	0:d616ece2d859	185	Also used during connect and close. */
mbed714	0:d616ece2d859	186	struct api_msg_msg *current_msg;
mbed714	0:d616ece2d859	187	#endif /* LWIP_TCP */
mbed714	0:d616ece2d859	188	/** A callback function that is informed about events for this netconn */
mbed714	0:d616ece2d859	189	netconn_callback callback;
mbed714	0:d616ece2d859	190	};
mbed714	0:d616ece2d859	191
mbed714	0:d616ece2d859	192	/** Register an Network connection event */
mbed714	0:d616ece2d859	193	#define API_EVENT(c,e,l) if (c->callback) { \
mbed714	0:d616ece2d859	194	(*c->callback)(c, e, l); \
mbed714	0:d616ece2d859	195	}
mbed714	0:d616ece2d859	196
mbed714	0:d616ece2d859	197	/** Set conn->last_err to err but don't overwrite fatal errors */
mbed714	0:d616ece2d859	198	#define NETCONN_SET_SAFE_ERR(conn, err) do { \
mbed714	0:d616ece2d859	199	SYS_ARCH_DECL_PROTECT(lev); \
mbed714	0:d616ece2d859	200	SYS_ARCH_PROTECT(lev); \
mbed714	0:d616ece2d859	201	if (!ERR_IS_FATAL((conn)->last_err)) { \
mbed714	0:d616ece2d859	202	(conn)->last_err = err; \
mbed714	0:d616ece2d859	203	} \
mbed714	0:d616ece2d859	204	SYS_ARCH_UNPROTECT(lev); \
mbed714	0:d616ece2d859	205	} while(0);
mbed714	0:d616ece2d859	206
mbed714	0:d616ece2d859	207	/* Network connection functions: */
mbed714	0:d616ece2d859	208	#define netconn_new(t) netconn_new_with_proto_and_callback(t, 0, NULL)
mbed714	0:d616ece2d859	209	#define netconn_new_with_callback(t, c) netconn_new_with_proto_and_callback(t, 0, c)
mbed714	0:d616ece2d859	210	struct
mbed714	0:d616ece2d859	211	netconn *netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto,
mbed714	0:d616ece2d859	212	netconn_callback callback);
mbed714	0:d616ece2d859	213	err_t netconn_delete(struct netconn *conn);
mbed714	0:d616ece2d859	214	/** Get the type of a netconn (as enum netconn_type). */
mbed714	0:d616ece2d859	215	#define netconn_type(conn) (conn->type)
mbed714	0:d616ece2d859	216
mbed714	0:d616ece2d859	217	err_t netconn_getaddr(struct netconn conn, ip_addr_t addr,
mbed714	0:d616ece2d859	218	u16_t *port, u8_t local);
mbed714	0:d616ece2d859	219	#define netconn_peer(c,i,p) netconn_getaddr(c,i,p,0)
mbed714	0:d616ece2d859	220	#define netconn_addr(c,i,p) netconn_getaddr(c,i,p,1)
mbed714	0:d616ece2d859	221
mbed714	0:d616ece2d859	222	err_t netconn_bind(struct netconn conn, ip_addr_t addr, u16_t port);
mbed714	0:d616ece2d859	223	err_t netconn_connect(struct netconn conn, ip_addr_t addr, u16_t port);
mbed714	0:d616ece2d859	224	err_t netconn_disconnect (struct netconn *conn);
mbed714	0:d616ece2d859	225	err_t netconn_listen_with_backlog(struct netconn *conn, u8_t backlog);
mbed714	0:d616ece2d859	226	#define netconn_listen(conn) netconn_listen_with_backlog(conn, TCP_DEFAULT_LISTEN_BACKLOG)
mbed714	0:d616ece2d859	227	err_t netconn_accept(struct netconn conn, struct netconn *new_conn);
mbed714	0:d616ece2d859	228	err_t netconn_recv(struct netconn conn, struct netbuf *new_buf);
mbed714	0:d616ece2d859	229	err_t netconn_recv_tcp_pbuf(struct netconn conn, struct pbuf *new_buf);
mbed714	0:d616ece2d859	230	void netconn_recved(struct netconn *conn, u32_t length);
mbed714	0:d616ece2d859	231	err_t netconn_sendto(struct netconn conn, struct netbuf buf,
mbed714	0:d616ece2d859	232	ip_addr_t *addr, u16_t port);
mbed714	0:d616ece2d859	233	err_t netconn_send(struct netconn conn, struct netbuf buf);
mbed714	0:d616ece2d859	234	err_t netconn_write(struct netconn conn, const void dataptr, size_t size,
mbed714	0:d616ece2d859	235	u8_t apiflags);
mbed714	0:d616ece2d859	236	err_t netconn_close(struct netconn *conn);
mbed714	0:d616ece2d859	237	err_t netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx);
mbed714	0:d616ece2d859	238
mbed714	0:d616ece2d859	239	#if LWIP_IGMP
mbed714	0:d616ece2d859	240	err_t netconn_join_leave_group(struct netconn conn, ip_addr_t multiaddr,
mbed714	0:d616ece2d859	241	ip_addr_t *netif_addr, enum netconn_igmp join_or_leave);
mbed714	0:d616ece2d859	242	#endif /* LWIP_IGMP */
mbed714	0:d616ece2d859	243	#if LWIP_DNS
mbed714	0:d616ece2d859	244	err_t netconn_gethostbyname(const char name, ip_addr_t addr);
mbed714	0:d616ece2d859	245	#endif /* LWIP_DNS */
mbed714	0:d616ece2d859	246
mbed714	0:d616ece2d859	247	#define netconn_err(conn) ((conn)->last_err)
mbed714	0:d616ece2d859	248	#define netconn_recv_bufsize(conn) ((conn)->recv_bufsize)
mbed714	0:d616ece2d859	249
mbed714	0:d616ece2d859	250	/** Set the blocking status of netconn calls (@todo: write/send is missing) */
mbed714	0:d616ece2d859	251	#define netconn_set_nonblocking(conn, val) do { if(val) { \
mbed714	0:d616ece2d859	252	(conn)->flags \|= NETCONN_FLAG_NON_BLOCKING; \
mbed714	0:d616ece2d859	253	} else { \
mbed714	0:d616ece2d859	254	(conn)->flags &= ~ NETCONN_FLAG_NON_BLOCKING; }} while(0)
mbed714	0:d616ece2d859	255	/** Get the blocking status of netconn calls (@todo: write/send is missing) */
mbed714	0:d616ece2d859	256	#define netconn_is_nonblocking(conn) (((conn)->flags & NETCONN_FLAG_NON_BLOCKING) != 0)
mbed714	0:d616ece2d859	257
mbed714	0:d616ece2d859	258	/** TCP: Set the no-auto-recved status of netconn calls (see NETCONN_FLAG_NO_AUTO_RECVED) */
mbed714	0:d616ece2d859	259	#define netconn_set_noautorecved(conn, val) do { if(val) { \
mbed714	0:d616ece2d859	260	(conn)->flags \|= NETCONN_FLAG_NO_AUTO_RECVED; \
mbed714	0:d616ece2d859	261	} else { \
mbed714	0:d616ece2d859	262	(conn)->flags &= ~ NETCONN_FLAG_NO_AUTO_RECVED; }} while(0)
mbed714	0:d616ece2d859	263	/** TCP: Get the no-auto-recved status of netconn calls (see NETCONN_FLAG_NO_AUTO_RECVED) */
mbed714	0:d616ece2d859	264	#define netconn_get_noautorecved(conn) (((conn)->flags & NETCONN_FLAG_NO_AUTO_RECVED) != 0)
mbed714	0:d616ece2d859	265
mbed714	0:d616ece2d859	266	#if LWIP_SO_RCVTIMEO
mbed714	0:d616ece2d859	267	/** Set the receive timeout in milliseconds */
mbed714	0:d616ece2d859	268	#define netconn_set_recvtimeout(conn, timeout) ((conn)->recv_timeout = (timeout))
mbed714	0:d616ece2d859	269	/** Get the receive timeout in milliseconds */
mbed714	0:d616ece2d859	270	#define netconn_get_recvtimeout(conn) ((conn)->recv_timeout)
mbed714	0:d616ece2d859	271	#endif /* LWIP_SO_RCVTIMEO */
mbed714	0:d616ece2d859	272	#if LWIP_SO_RCVBUF
mbed714	0:d616ece2d859	273	/** Set the receive buffer in bytes */
mbed714	0:d616ece2d859	274	#define netconn_set_recvbufsize(conn, recvbufsize) ((conn)->recv_bufsize = (recvbufsize))
mbed714	0:d616ece2d859	275	/** Get the receive buffer in bytes */
mbed714	0:d616ece2d859	276	#define netconn_get_recvbufsize(conn) ((conn)->recv_bufsize)
mbed714	0:d616ece2d859	277	#endif /* LWIP_SO_RCVBUF*/
mbed714	0:d616ece2d859	278
mbed714	0:d616ece2d859	279	#ifdef __cplusplus
mbed714	0:d616ece2d859	280	}
mbed714	0:d616ece2d859	281	#endif
mbed714	0:d616ece2d859	282
mbed714	0:d616ece2d859	283	#endif /* LWIP_NETCONN */
mbed714	0:d616ece2d859	284
mbed714	0:d616ece2d859	285	#endif /* __LWIP_API_H__ */

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lwip/include/lwip/api.h@0:d616ece2d859, 2010-09-18 (annotated)

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