C++ ccn_charbuf_create函数代码示例

struct ccndc_data *
ccndc_initialize_data(void) {
    struct ccndc_data *self;
    const char *msg = "Unable to initialize ccndc";
    int res;
    
    self = calloc(1, sizeof(*self));
    if (self == NULL) {
        ON_ERROR_EXIT (-1, msg);
    }
    
    self->ccn_handle = ccn_create();
    ON_ERROR_EXIT(ccn_connect(self->ccn_handle, NULL), "Unable to connect to local ccnd");
    ON_ERROR_EXIT(ccndc_get_ccnd_id(self), "Unable to obtain ID of local ccnd");
    
    /* Set up an Interest template to indicate scope 1 (Local) */
    self->local_scope_template = ccn_charbuf_create();
    res = ccnb_element_begin(self->local_scope_template, CCN_DTAG_Interest);
    res |= ccnb_element_begin(self->local_scope_template, CCN_DTAG_Name);
    res |= ccnb_element_end(self->local_scope_template);	/* </Name> */
    res |= ccnb_tagged_putf(self->local_scope_template, CCN_DTAG_Scope, "1");
    res |= ccnb_element_end(self->local_scope_template);	/* </Interest> */
    ON_ERROR_EXIT(res, msg);
    
    /* Create a null name */
    self->no_name = ccn_charbuf_create();
    ON_ERROR_EXIT(ccn_name_init(self->no_name), msg);
    
    self->lifetime = (~0U) >> 1;
    
    return self;
}

/**
 * Write a file named index/stable that contains the size of
 * repoFile1 when the repository is shut down.
 */
static int
r_store_write_stable_point(struct ccnr_handle *h)
{
    struct ccn_charbuf *path = NULL;
    struct ccn_charbuf *cb = NULL;
    int fd;
    
    path = ccn_charbuf_create();
    cb = ccn_charbuf_create();
    ccn_charbuf_putf(path, "%s/index/stable", h->directory);
    unlink(ccn_charbuf_as_string(path)); /* Should not exist, but just in case. */
    fd = open(ccn_charbuf_as_string(path),
              O_CREAT | O_EXCL | O_WRONLY | O_TRUNC, 0666);
    if (fd == -1) {
        ccnr_msg(h, "cannot write stable mark %s: %s",
                 ccn_charbuf_as_string(path), strerror(errno));
        unlink(ccn_charbuf_as_string(path));
    }
    else {
        ccn_charbuf_putf(cb, "%ju", (uintmax_t)(h->stable));
        write(fd, cb->buf, cb->length);
        close(fd);
        if (CCNSHOULDLOG(h, dfsdf, CCNL_INFO))
            ccnr_msg(h, "Index marked stable - %s", ccn_charbuf_as_string(cb));
    }
    ccn_charbuf_destroy(&path);
    ccn_charbuf_destroy(&cb);
    return(0);
}

char * 
get_orig_router_from_info_content_name(struct ccn_charbuf * content_name)
{
	int start,end;

	start=0;

	struct ccn_indexbuf *comps=ccn_indexbuf_create();
	ccn_name_split (content_name, comps);

	end=check_for_name_component_in_name(content_name,comps,"nlsr");


	struct ccn_charbuf *temp=ccn_charbuf_create();
	ccn_name_init(temp);	
	ccn_name_append_components( temp,	content_name->buf,
								comps->buf[start], 
								comps->buf[end]);

	struct ccn_charbuf *temp1=ccn_charbuf_create();
	ccn_uri_append(temp1, temp->buf, temp->length, 0);

	char *orig_router=(char *)calloc(strlen(ccn_charbuf_as_string(temp1))+1,
																sizeof(char));
	memcpy(orig_router,ccn_charbuf_as_string(temp1),
										strlen(ccn_charbuf_as_string(temp1)));
	orig_router[strlen(orig_router)]='\0';
	
	ccn_charbuf_destroy(&temp);
	ccn_charbuf_destroy(&temp1);
	ccn_indexbuf_destroy(&comps);
	return orig_router;
	

}

/**
 *
 * Create new face by sending out a request Interest
 * The actual new face instance is returned
 * 
 */
static 
struct ccn_face_instance *create_face(struct ccn *h, struct ccn_charbuf *local_scope_template,
        struct ccn_charbuf *no_name, struct ccn_face_instance *face_instance)
{
	struct ccn_charbuf *newface = NULL;
	struct ccn_charbuf *signed_info = NULL;
	struct ccn_charbuf *temp = NULL;
	struct ccn_charbuf *name = NULL;
	struct ccn_charbuf *resultbuf = NULL;
	struct ccn_parsed_ContentObject pcobuf = {0};
	struct ccn_face_instance *new_face_instance = NULL;
	const unsigned char *ptr = NULL;
	size_t length = 0;
	int res = 0;

	/* Encode the given face instance */
	newface = ccn_charbuf_create();
	ccnb_append_face_instance(newface, face_instance);

	temp = ccn_charbuf_create();
	res = ccn_sign_content(h, temp, no_name, NULL, newface->buf, newface->length);
	resultbuf = ccn_charbuf_create();

	/* Construct the Interest name that will create the face */
	name = ccn_charbuf_create();
	ccn_name_init(name);
	ccn_name_append_str(name, "ccnx");
	ccn_name_append(name, face_instance->ccnd_id, face_instance->ccnd_id_size);
	ccn_name_append_str(name, face_instance->action);
	ccn_name_append(name, temp->buf, temp->length);

	/* send Interest to retrieve Data that contains the newly created face */
	res = ccn_get(h, name, local_scope_template, 1000, resultbuf, &pcobuf, NULL, 0);
	ON_ERROR_CLEANUP(res);

	/* decode Data to get the actual face instance */
	res = ccn_content_get_value(resultbuf->buf, resultbuf->length, &pcobuf, &ptr, &length);
	ON_ERROR_CLEANUP(res);

	new_face_instance = ccn_face_instance_parse(ptr, length);

	ccn_charbuf_destroy(&newface);
	ccn_charbuf_destroy(&signed_info);
	ccn_charbuf_destroy(&temp);
	ccn_charbuf_destroy(&resultbuf);
	ccn_charbuf_destroy(&name);

	return new_face_instance;

	cleanup:
		ccn_charbuf_destroy(&newface);
		ccn_charbuf_destroy(&signed_info);
		ccn_charbuf_destroy(&temp);
		ccn_charbuf_destroy(&resultbuf);
		ccn_charbuf_destroy(&name);

	return NULL;
}

static int 
add_delete_ccn_face(struct ccn *h, const char *uri, const char *address, const unsigned int p, int operation)
{
	struct ccn_charbuf *prefix;
	char port[6];
	struct ccn_charbuf *local_scope_template = ccn_charbuf_create();
	struct ccn_charbuf *no_name = ccn_charbuf_create();
	unsigned char ccndid_storage[32] = {0};
	unsigned char *ccndid = ccndid_storage;
	size_t ccndid_size = 0;
	struct ccn_face_instance *fi;
	struct ccn_face_instance *nfi;
	int res;

	prefix = ccn_charbuf_create();
	res = ccn_name_from_uri(prefix, uri);
	ON_ERROR_CLEANUP(res);
	memset(port, 0, 6);
	sprintf(port, "%d", p);

	init_data(local_scope_template, no_name);

	ccndid_size = get_ccndid(h, local_scope_template, ccndid);
	if (ccndid_size != sizeof(ccndid_storage))
 	{
		fprintf(stderr, "Incorrect size for ccnd id in response\n");
		ON_ERROR_CLEANUP(-1);
	}

	/* construct a face instance for new face request */
	fi = construct_face(ccndid, ccndid_size, address, port);
	ON_NULL_CLEANUP(fi);

	/* send new face request to actually create a new face */
	nfi = create_face(h, local_scope_template, no_name, fi);
	ON_NULL_CLEANUP(nfi);

	res = register_unregister_prefix(h, local_scope_template, no_name, prefix, nfi, operation);
	ON_ERROR_CLEANUP(res);

	ccn_charbuf_destroy(&local_scope_template);
	ccn_charbuf_destroy(&no_name);
	ccn_face_instance_destroy(&fi);
	ccn_face_instance_destroy(&nfi);
	ccn_charbuf_destroy(&prefix);

	return 0;

	cleanup:
		ccn_charbuf_destroy(&prefix);
		ccn_charbuf_destroy(&local_scope_template);
		ccn_charbuf_destroy(&no_name);
		ccn_face_instance_destroy(&fi);
		ccn_face_instance_destroy(&nfi);

	return -1;
}

int 
get_content_by_content_name(char *content_name, unsigned char **content_data,
							char *orig_router)
{
	
	int ret=-1;
	struct ccn_charbuf *name = NULL;
	struct ccn_charbuf *templ = NULL;
	struct ccn_charbuf *resultbuf = NULL;
	struct ccn_parsed_ContentObject pcobuf = { 0 };
	int res;
	int allow_stale = 1;
	int content_only = 1;
	int scope = -1;
	const unsigned char *ptr,*ptr_in; 
	size_t length,length_in;
	int resolve_version = CCN_V_HIGHEST;
	int timeout_ms = 3000;
	const unsigned lifetime_default = CCN_INTEREST_LIFETIME_SEC << 12;
	unsigned lifetime_l12 = lifetime_default;
	int get_flags = 0;

	name = ccn_charbuf_create();
	res = ccn_name_from_uri(name,content_name);
	if (res < 0) {
		fprintf(stderr, "Bad ccn URI: %s\n", content_name);
		ccn_charbuf_destroy(&name);
		return ret;
	}

	if (allow_stale || lifetime_l12 != lifetime_default || scope != -1) {
		templ = ccn_charbuf_create();
		ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
		ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
		ccn_charbuf_append_closer(templ); /* </Name> */
		if (allow_stale) {
			ccn_charbuf_append_tt(templ, CCN_DTAG_AnswerOriginKind, CCN_DTAG);
			ccnb_append_number(templ,
					CCN_AOK_DEFAULT | CCN_AOK_STALE);
			ccn_charbuf_append_closer(templ); /* </AnswerOriginKind> */
		}
		if (scope != -1) {
			ccnb_tagged_putf(templ, CCN_DTAG_Scope, "%d", scope);
		}
		if (lifetime_l12 != lifetime_default) {
			/*
			 * Choose the interest lifetime so there are at least 3
			 * expressions (in the unsatisfied case).
			 */
			unsigned char buf[3] = { 0 };
			int i;
			for (i = sizeof(buf) - 1; i >= 0; i--, lifetime_l12 >>= 8)
				buf[i] = lifetime_l12 & 0xff;
			ccnb_append_tagged_blob(templ, CCN_DTAG_InterestLifetime, buf, 
					sizeof(buf));
		}

int ccn_dhcp_content_parse(const unsigned char *p, size_t size, struct ccn_dhcp_entry *tail)
{
    struct ccn_buf_decoder decoder;
    struct ccn_buf_decoder *d = ccn_buf_decoder_start(&decoder, p, size);
    int i;
    int count;
    struct ccn_dhcp_entry *de = tail;

    if (ccn_buf_match_dtag(d, CCN_DTAG_Entry)) {
        ccn_buf_advance(d);

        count = ccn_parse_optional_tagged_nonNegativeInteger(d, CCN_DTAG_Count);

        for (i = 0; i < count; i ++) {
            struct ccn_charbuf *store = ccn_charbuf_create();
            size_t start;
            size_t end;
            int host_off = -1;
            int port_off = -1;

            de->next = calloc(1, sizeof(*de));
            de = de->next;
            memset(de, 0, sizeof(*de));
            de->store = store;
            de->next = NULL;

            if (ccn_buf_match_dtag(d, CCN_DTAG_Name)) {
                de->name_prefix = ccn_charbuf_create();
                start = d->decoder.token_index;
                ccn_parse_Name(d, NULL);
                end = d->decoder.token_index;
                ccn_charbuf_append(de->name_prefix, p + start, end - start);
            }
            else
                de->name_prefix = NULL;

            host_off = ccn_parse_tagged_string(d, CCN_DTAG_Host, store);
            port_off = ccn_parse_tagged_string(d, CCN_DTAG_Port, store);

            char *b = (char *)store->buf;
            char *h = b + host_off;
            char *p = b + port_off;
            if (host_off >= 0)
                memcpy((void *)de->address, h, strlen(h));
            if (port_off >= 0)
                memcpy((void *)de->port, p, strlen(p));
        }
    }
    else
        d->decoder.state = -__LINE__;

    if (d->decoder.index != size || !CCN_FINAL_DSTATE(d->decoder.state))
        ccn_dhcp_content_destroy(tail->next);

    return count;
}

char * 
get_orig_router_from_lsa_name(struct ccn_charbuf * content_name)
{
	int start=0;

	size_t comp_size;
	const unsigned char *second_last_comp;
	char *second_comp_type;
	char *sep=".";
	char *rem;

	struct ccn_indexbuf *components=ccn_indexbuf_create();
	struct ccn_charbuf *name=ccn_charbuf_create();
	ccn_name_from_uri(name,nlsr->slice_prefix);
	ccn_name_split (name, components);
	start=components->n-2;
	ccn_charbuf_destroy(&name);
	ccn_indexbuf_destroy(&components);

	struct ccn_indexbuf *comps=ccn_indexbuf_create();
	ccn_name_split (content_name, comps);
	ccn_name_comp_get( content_name->buf, comps, 
					  comps->n-1-2, &second_last_comp, &comp_size);

	second_comp_type=strtok_r((char *)second_last_comp, sep, &rem);
	if ( strcmp( second_comp_type, "lsId" ) == 0 ){
		ccn_name_chop(content_name,comps,-3);
	}
	else{
		ccn_name_chop(content_name,comps,-2);
	}
	

	struct ccn_charbuf *temp=ccn_charbuf_create();
	ccn_name_init(temp);	
	ccn_name_append_components( temp,	content_name->buf,
								comps->buf[start+1], 
								comps->buf[comps->n - 1]);

	struct ccn_charbuf *temp1=ccn_charbuf_create();
	ccn_uri_append(temp1, temp->buf, temp->length, 0);

	char *orig_router=(char *)calloc(strlen(ccn_charbuf_as_string(temp1))+1,
																sizeof(char));
	memcpy(orig_router,ccn_charbuf_as_string(temp1),
										strlen(ccn_charbuf_as_string(temp1)));
	orig_router[strlen(orig_router)]='\0';
	
	ccn_charbuf_destroy(&temp);
	ccn_charbuf_destroy(&temp1);
	ccn_indexbuf_destroy(&comps);
	return orig_router;
	

}

/**
 * Verify a signed interest
 *
 * params are as returned in upcall info structure
 * key is what should be used to verify
 *
 * returns:
 * -1 for parsing error
 *  0 for incorrect signature / unverified
 *  1 for proper verification
 *
 */
int verify_signed_interest(const unsigned char *ccnb, const struct ccn_indexbuf *comps,
							  size_t num_comps, size_t start, size_t stop,
							  struct ccn_pkey* key) {

    fprintf(stderr,"verifying signed interest...\n");
    
    // What is info->interest_comps->n ?
    //fprintf(stderr, "Interest components %d\n", (int) info->interest_comps->n);

    unsigned char* comp;
    size_t size;
    int res;

    // Create a charbuf with the matched interest name incl nonce
	struct ccn_charbuf* name = ccn_charbuf_create();
    ccn_name_init(name);
    res = ccn_name_append_components(name, ccnb, start, stop);

    // Last component, should be the signature
    res = ccn_name_comp_get(ccnb, comps,
    						num_comps,
                            (const unsigned char**)&comp, &size);
	if (memcmp(NS_SIGNATURE, comp, NS_SIGNATURE_LEN) != 0) {
		fprintf(stderr, "debug: Last component not tagged as a signature.\n");
		return(-1);
	}
    
	// Parse our nameless, dataless content object that follows the namespace
	// and replace the name with the implicit name from the interest, so that
	// we can use the standard signature verification calls.  Could be made
	// more efficient with different library calls.
	struct ccn_charbuf* co_with_name = ccn_charbuf_create();
    unsigned char* co = &comp[NS_SIGNATURE_LEN];
    replace_name(co_with_name, co, size-NS_SIGNATURE_LEN, name);
	//fprintf(stderr, "replace_name == %d (%s)\n", res, (res==0)?"ok":"fail");

	// For now, use standard routines to verify signature
	struct ccn_parsed_ContentObject pco = {0};

    fprintf(stderr,"verifying signed interest...2\n");
    
	res = ccn_parse_ContentObject(co_with_name->buf, co_with_name->length, &pco, NULL);
	if (!res) {
		// Verify the signature against the authorized public key given to us, passed through to the handler
		res = ccn_verify_signature(co_with_name->buf, pco.offset[CCN_PCO_E], &pco, key );
	} else {
		fprintf(stderr, "debug: Constructed content object parse failed (res==%d)\n", res);
	}
    fprintf(stderr,"verifying signed interest...3\n");
	ccn_charbuf_destroy(&co_with_name);
	ccn_charbuf_destroy(&name);
	return (res);

}

/**
 * Base loop for the background CCN task
 *
 * This is the main execution loop for the background task responsible for
 * interacting with the CCN network. It is from this point that many of the above methods are
 * called to work the inbound messages from ccnx as well as sending out the data messages.
 *
 * \param data		the task context information setup by the parent sink element thread
 */
static void
ccn_event_thread (void *data)
{
  Gstccnxsink *me = (Gstccnxsink *) data;
  struct ccn_charbuf *filtName;
  struct ccn_charbuf *temp;
  int res = 0;

  GST_DEBUG ("CCNxSink event: *** event thread starting");

  temp = ccn_charbuf_create ();
  filtName = ccn_charbuf_create ();

  /* A closure is what defines what to do when an inbound interest arrives */
  if ((me->ccn_closure = calloc (1, sizeof (struct ccn_closure))) == NULL) {
    GST_ELEMENT_ERROR (me, RESOURCE, READ, (NULL), ("closure alloc failed"));
    return;
  }

  /* We setup the closure to contain the sink element context reference, and also tell it what function to call */
  me->ccn_closure->data = me;
  me->ccn_closure->p = new_interests;
  me->timeouts = 0;
  ccn_charbuf_append (filtName, me->name->buf, me->name->length);

  /* This call will set up a handler for interests we expect to get from clients */

  // hDump(DUMP_ADDR(filtName->buf), DUMP_SIZE(filtName->length));
  ccn_set_interest_filter (me->ccn, filtName, me->ccn_closure);
  GST_DEBUG ("CCNxSink event: interest filter registered\n");

  /* Some debugging information */
  temp->length = 0;
  ccn_uri_append (temp, me->name->buf, me->name->length, TRUE);
  GST_DEBUG ("CCNxSink event: using uri: %s\n", ccn_charbuf_as_string (temp));

  /* Now that the interest is registered, we loop around waiting for something to do */
  /* We pass control to ccnx for a while so it can work with any incoming or outgoing data */
  /* and then we check our fifo queue for work to do. That's about it! */
  /* We check to see if any problems have caused our ccnd connection to fail, and we reconnect */
  while (res >= 0) {
    GST_DEBUG ("CCNxSink event: *** looping");
    res = ccn_run (me->ccn, 50);
    check_fifo (me);
    if (res < 0 && ccn_get_connection_fd (me->ccn) == -1) {
      GST_DEBUG ("CCNxSink event: need to reconnect...");
      /* Try reconnecting, after a bit of delay */
      msleep ((30 + (getpid () % 30)) * 1000);
      res = ccn_connect (me->ccn, ccndHost ());
    }
  }
  GST_DEBUG ("CCNxSink event: *** event thread ending");
}

void NdnMediaProcess::initPipe(struct ccn_closure *selfp, struct ccn_upcall_info *info, UserDataBuf *userBuf) {
	fprintf(stderr, "initializing pipe\n");
	// get seq
	const unsigned char *ccnb = info->content_ccnb;
	size_t ccnb_size = info->pco->offset[CCN_PCO_E];
	struct ccn_indexbuf *comps = info->content_comps;

	long seq;
	const unsigned char *seqptr = NULL;
	char *endptr = NULL;
	size_t seq_size = 0;
	int k = comps->n - 2;

	if (userBuf->seq < 0) {
		seq = ccn_ref_tagged_BLOB(CCN_DTAG_Component, ccnb,
				comps->buf[k], comps->buf[k + 1],
				&seqptr, &seq_size);
		if (seq >= 0) {
			seq = strtol((const char *)seqptr, &endptr, 10);
			if (endptr != ((const char *)seqptr) + seq_size)
				seq = -1;
		}
		if (seq >= 0) {
			userBuf->seq = seq;
		}
		else {
			return;
		}
	}	
	
	fprintf(stderr, "fetched content with seq %d\n", seq);
	// send hint-ahead interests
	for (int i = 0; i < hint_ahead; i ++) {
		userBuf->seq++;
		struct ccn_charbuf *pathbuf = ccn_charbuf_create();
		ccn_name_init(pathbuf);
		ccn_name_append_components(pathbuf, ccnb, comps->buf[0], comps->buf[k]);
		struct ccn_charbuf *temp = ccn_charbuf_create();
		ccn_charbuf_putf(temp, "%ld", userBuf->seq);
		ccn_name_append(pathbuf, temp->buf, temp->length);
		
		// no need to trylock as we already have the lock
		// this should use  pipe callback, selfp is normal callback
		int res = ccn_express_interest(info->h, pathbuf, userBuf->data_buf.pipe_callback, NULL);
		if (res < 0) {
			fprintf(stderr, "Sending interest failed at normal processor\n");
			std::exit(1);
		}
		ccn_charbuf_destroy(&pathbuf);
		ccn_charbuf_destroy(&temp);
	}
}

int NdnMediaProcess::checkInterest()
{
    int res = 0;
    QHash<QString,UserDataBuf *>::iterator it; 
	ruMutex->lock();
    for ( it = qhRemoteUser.begin(); it != qhRemoteUser.end(); ++it ) {
        if (!it.value()->interested) {
            /* Use a template to express our order preference for the first packet. */
            struct ccn_charbuf *templ = ccn_charbuf_create();
            struct ccn_charbuf *path = ccn_charbuf_create();
            ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
            ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
            ccn_charbuf_append_closer(templ);
            ccn_charbuf_append_tt(templ, CCN_DTAG_ChildSelector, CCN_DTAG);
            ccn_charbuf_append_tt(templ, 1, CCN_UDATA);
            ccn_charbuf_append(templ, "1", 1);	/* low bit 1: rightmost */
            ccn_charbuf_append_closer(templ); /*<ChildSelector>*/
            ccn_charbuf_append_closer(templ);
			ccn_name_from_uri(path, it.key().toLocal8Bit().constData());
			ccn_name_append_str(path, "audio");
            if (res >= 0) {
                if (it.value()->data_buf.callback->p == NULL) {fprintf(stderr, "data_buf.callback is NULL!\n"); exit(1); }
				/*
				int c = 0;
				while (pthread_mutex_trylock(&ccn_mutex) != 0) {
					c++;
					if (c > 10000000) {
						fprintf(stderr, "cannot obtain lock! %s:%d\n", __FILE__, __LINE__);
						std::exit(1);
					}
				}
				*/
				pthread_mutex_lock(&ccn_mutex);
                res = ccn_express_interest(ndnState.ccn, path, it.value()->data_buf.callback, templ);
				pthread_mutex_unlock(&ccn_mutex);
                it.value()->interested = 1;
				fprintf(stderr, "short interest sent\n");
            }
            if (res < 0) {
				fprintf(stderr, "sending the first interest failed\n");
				exit(1);
			}
            ccn_charbuf_destroy(&path);
            ccn_charbuf_destroy(&templ);
        }
    }
	ruMutex->unlock();
    return res;
}

struct ccn_proxy *
ccn_proxy_init(const char *filter_uri,
               const char *prefix_uri)
{
    struct ccn_proxy *proxy = calloc(1, sizeof(struct ccn_proxy));
    struct ccn_buf_decoder decoder;
    struct ccn_buf_decoder *d = &decoder;
    int res;

    DEBUG_PRINT("IN %d %s\n", __LINE__, __func__);



    /* Convert URI to name this proxy is responsible for */

    proxy->prefix = ccn_charbuf_create();
    res = ccn_name_from_uri(proxy->prefix, prefix_uri);

    if (res < 0) {
        DEBUG_PRINT("ABORT %d %s bad ccn URI: %s\n", __LINE__, __func__, prefix_uri);
        abort();
    }

    d = ccn_buf_decoder_start(d, proxy->prefix->buf, proxy->prefix->length);
    proxy->prefix_comps = ccn_indexbuf_create();
    proxy->prefix_ncomps = ccn_parse_Name(d, proxy->prefix_comps);


    proxy->filter = ccn_charbuf_create();
    res = ccn_name_from_uri(proxy->filter, filter_uri);

    if (res < 0) {
        DEBUG_PRINT("ABORT %d %s bad ccn URI: %s\n", __LINE__, __func__, filter_uri);
        abort();
    }


    /* Initialization should be done by ccn_proxy_connect() */

    proxy->handle_name = ccn_charbuf_create();
    ccn_charbuf_append_string(proxy->handle_name, "in/outb");



    DEBUG_PRINT("OUT %d %s\n", __LINE__, __func__);

    return(proxy);
}

int
sync_cb(struct ccns_handle *h,
        struct ccn_charbuf *lhash,
        struct ccn_charbuf *rhash,
        struct ccn_charbuf *name)
{
    char *hexL;
    char *hexR;
    struct ccn_charbuf *uri = ccn_charbuf_create();
    ccn_uri_append(uri, name->buf, name->length, 1);
    if (lhash == NULL || lhash->length == 0) {
        hexL = strdup("none");
    } else
        hexL = hex_string(lhash->buf, lhash->length);
    if (rhash == NULL || rhash->length == 0) {
        hexR = strdup("none");
    } else
        hexR = hex_string(rhash->buf, rhash->length);
    printf("%s %s %s\n", ccn_charbuf_as_string(uri), hexL, hexR);
    fflush(stdout);
    free(hexL);
    free(hexR);
    ccn_charbuf_destroy(&uri);
    return(0);
}

/*
 * utility, may need to be exported, to parse the buffer into a given slice
 * structure.
 */
static int
slice_parse(struct ccns_slice *s, const unsigned char *p, size_t size) {
    int res = 0;
    struct ccn_buf_decoder decoder;
    struct ccn_buf_decoder *d = ccn_buf_decoder_start(&decoder, p, size);
    uintmax_t version;
    int op;
    int start;
    struct ccn_charbuf *clause = NULL;

    if (!ccn_buf_match_dtag(d, CCN_DTAG_SyncConfigSlice))
        return (-1);
    ccn_buf_advance(d);
    if (!ccn_buf_match_dtag(d, CCN_DTAG_SyncVersion))
        return (-1);
    ccn_buf_advance(d);
    ccn_parse_uintmax(d, &version);
    ccn_buf_check_close(d);
    if (version != SLICE_VERSION)
        return (-1);
    start = d->decoder.token_index;
    if (ccn_parse_Name(d, NULL) < 0)
        return(-1);
    ccn_charbuf_reset(s->topo);
    res = ccn_charbuf_append(s->topo, p + start, d->decoder.token_index - start);
    if (res < 0)
        return(-1);
    start = d->decoder.token_index;
    if (ccn_parse_Name(d, NULL) < 0)
        return(-1);
    ccn_charbuf_reset(s->prefix);
    res = ccn_charbuf_append(s->prefix, p + start, d->decoder.token_index - start);
    if (res < 0)
        return(-1);
    if (!ccn_buf_match_dtag(d, CCN_DTAG_SyncConfigSliceList))
        return(-1);
    ccn_buf_advance(d);
    clause = ccn_charbuf_create();
    if (clause == NULL)
        return(-1);
    while (ccn_buf_match_dtag(d, CCN_DTAG_SyncConfigSliceOp)) {
        ccn_buf_advance(d);
        op = ccn_parse_nonNegativeInteger(d); // op is a small integer
        ccn_buf_check_close(d);
        if (op != 0)
            break;
        ccn_charbuf_reset(clause);
        start = d->decoder.token_index;
        if (ccn_parse_Name(d, NULL) < 0)
            break;
        res = ccn_charbuf_append(clause, p + start, d->decoder.token_index - start);
        ccns_slice_add_clause(s, clause);
    }
    ccn_charbuf_destroy(&clause);
    ccn_buf_check_close(d); /* </SyncConfigSliceList> */
    ccn_buf_check_close(d); /* </SyncConfigSlice> */
    if (d->decoder.index != size || !CCN_FINAL_DSTATE(d->decoder.state))
        return(-1);
    return(0);
}