/* 
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005-2009, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Anthony Minessale II <anthm@freeswitch.org>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 * Anthony Minessale II <anthm@freeswitch.org>
 * Michael Jerris <mike@jerris.com>
 * Paul D. Tinsley <pdt at jackhammer.org>
 *
 *
 * switch_event.c -- Event System
 *
 */

#include <switch.h>
#include <switch_event.h>

#define DISPATCH_QUEUE_LEN 5000
//#define DEBUG_DISPATCH_QUEUES

/*! \brief A node to store binded events */
struct switch_event_node {
	/*! the id of the node */
	char *id;
	/*! the event id enumeration to bind to */
	switch_event_types_t event_id;
	/*! the event subclass to bind to for custom events */
	switch_event_subclass_t *subclass;
	/*! a callback function to execute when the event is triggered */
	switch_event_callback_t callback;
	/*! private data */
	void *user_data;
	struct switch_event_node *next;
};

/*! \brief A registered custom event subclass  */
struct switch_event_subclass {
	/*! the owner of the subclass */
	char *owner;
	/*! the subclass name */
	char *name;
};

#define MAX_DISPATCH_VAL 20
static unsigned int MAX_DISPATCH = MAX_DISPATCH_VAL;
static unsigned int SOFT_MAX_DISPATCH = 0;
static char hostname[128] = "";
static char guess_ip_v4[80] = "";
static char guess_ip_v6[80] = "";
static switch_event_node_t *EVENT_NODES[SWITCH_EVENT_ALL + 1] = { NULL };
static switch_thread_rwlock_t *RWLOCK = NULL;
static switch_mutex_t *BLOCK = NULL;
static switch_mutex_t *POOL_LOCK = NULL;
static switch_memory_pool_t *RUNTIME_POOL = NULL;
static switch_memory_pool_t *THRUNTIME_POOL = NULL;
#define NUMBER_OF_QUEUES 3
static switch_thread_t *EVENT_QUEUE_THREADS[NUMBER_OF_QUEUES] = { 0 };
static switch_queue_t *EVENT_QUEUE[NUMBER_OF_QUEUES] = { 0 };
static switch_thread_t *EVENT_DISPATCH_QUEUE_THREADS[MAX_DISPATCH_VAL] = { 0 };
static switch_queue_t *EVENT_DISPATCH_QUEUE[MAX_DISPATCH_VAL] = { 0 };
static int POOL_COUNT_MAX = SWITCH_CORE_QUEUE_LEN;
static switch_mutex_t *EVENT_QUEUE_MUTEX = NULL;
static switch_hash_t *CUSTOM_HASH = NULL;
static int THREAD_COUNT = 0;
static int SYSTEM_RUNNING = 0;
#ifdef SWITCH_EVENT_RECYCLE
static switch_queue_t *EVENT_RECYCLE_QUEUE = NULL;
static switch_queue_t *EVENT_HEADER_RECYCLE_QUEUE = NULL;
#endif
static void launch_dispatch_threads(uint32_t max, int len, switch_memory_pool_t *pool);

static char *my_dup(const char *s)
{
	size_t len = strlen(s) + 1;
	void *new = malloc(len);
	switch_assert(new);

	return (char *) memcpy(new, s, len);
}

#ifndef ALLOC
#define ALLOC(size) malloc(size)
#endif
#ifndef DUP
#define DUP(str) my_dup(str)
#endif
#ifndef FREE
#define FREE(ptr) switch_safe_free(ptr)
#endif

/* make sure this is synced with the switch_event_types_t enum in switch_types.h
   also never put any new ones before EVENT_ALL
*/
static char *EVENT_NAMES[] = {
	"CUSTOM",
	"CLONE",
	"CHANNEL_CREATE",
	"CHANNEL_DESTROY",
	"CHANNEL_STATE",
	"CHANNEL_ANSWER",
	"CHANNEL_HANGUP",
	"CHANNEL_EXECUTE",
	"CHANNEL_EXECUTE_COMPLETE",
	"CHANNEL_BRIDGE",
	"CHANNEL_UNBRIDGE",
	"CHANNEL_PROGRESS",
	"CHANNEL_PROGRESS_MEDIA",
	"CHANNEL_OUTGOING",
	"CHANNEL_PARK",
	"CHANNEL_UNPARK",
	"CHANNEL_APPLICATION",
	"CHANNEL_ORIGINATE",
	"CHANNEL_UUID",
	"API",
	"LOG",
	"INBOUND_CHAN",
	"OUTBOUND_CHAN",
	"STARTUP",
	"SHUTDOWN",
	"PUBLISH",
	"UNPUBLISH",
	"TALK",
	"NOTALK",
	"SESSION_CRASH",
	"MODULE_LOAD",
	"MODULE_UNLOAD",
	"DTMF",
	"MESSAGE",
	"PRESENCE_IN",
	"NOTIFY_IN",
	"PRESENCE_OUT",
	"PRESENCE_PROBE",
	"MESSAGE_WAITING",
	"MESSAGE_QUERY",
	"ROSTER",
	"CODEC",
	"BACKGROUND_JOB",
	"DETECTED_SPEECH",
	"DETECTED_TONE",
	"PRIVATE_COMMAND",
	"HEARTBEAT",
	"TRAP",
	"ADD_SCHEDULE",
	"DEL_SCHEDULE",
	"EXE_SCHEDULE",
	"RE_SCHEDULE",
	"RELOADXML",
	"NOTIFY",
	"SEND_MESSAGE",
	"RECV_MESSAGE",
	"REQUEST_PARAMS",
	"CHANNEL_DATA",
	"GENERAL",
	"COMMAND",
	"SESSION_HEARTBEAT",
	"CLIENT_DISCONNECTED",
	"SERVER_DISCONNECTED",
	"ALL"
};

static int switch_events_match(switch_event_t *event, switch_event_node_t *node)
{
	int match = 0;
	
	if (node->event_id == SWITCH_EVENT_ALL) {
		match++;
		
		if (!node->subclass) {
			return match;
		}
	}
	
	if (match || event->event_id == node->event_id) {

		if (event->subclass_name && node->subclass) {
			if (!strncasecmp(node->subclass->name, "file:", 5)) {
				char *file_header;
				if ((file_header = switch_event_get_header(event, "file")) != 0) {
					match = strstr(node->subclass->name + 5, file_header) ? 1 : 0;
				}
			} else if (!strncasecmp(node->subclass->name, "func:", 5)) {
				char *func_header;
				if ((func_header = switch_event_get_header(event, "function")) != 0) {
					match = strstr(node->subclass->name + 5, func_header) ? 1 : 0;
				}
			} else if (event->subclass_name && node->subclass->name) {
				match = strstr(event->subclass_name, node->subclass->name) ? 1 : 0;
			}
		} else if ((event->subclass_name && !node->subclass) || (!event->subclass_name && !node->subclass)) {
			match = 1;
		} else {
			match = 0;
		}
	}

	return match;
}

static void *SWITCH_THREAD_FUNC switch_event_dispatch_thread(switch_thread_t *thread, void *obj)
{
	switch_queue_t *queue = (switch_queue_t *) obj;
	int my_id = 0;
	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	THREAD_COUNT++;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	for (my_id = 0; my_id < NUMBER_OF_QUEUES; my_id++) {
		if (EVENT_DISPATCH_QUEUE[my_id] == queue) {
			break;
		}
	}

	for (;;) {
		void *pop = NULL;
		switch_event_t *event = NULL;

		if (!SYSTEM_RUNNING) {
			break;
		}

		if (switch_queue_pop(queue, &pop) != SWITCH_STATUS_SUCCESS) {
			break;
		}

		if (!pop) {
			break;
		}

		event = (switch_event_t *) pop;
		switch_event_deliver(&event);
	}


	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	THREAD_COUNT--;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Dispatch Thread %d Ended.\n", my_id);
	return NULL;

}


static void *SWITCH_THREAD_FUNC switch_event_thread(switch_thread_t *thread, void *obj)
{
	switch_queue_t *queue = (switch_queue_t *) obj;
	uint32_t index = 0;
	int my_id = 0;

	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	THREAD_COUNT++;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	for (my_id = 0; my_id < NUMBER_OF_QUEUES; my_id++) {
		if (EVENT_QUEUE[my_id] == queue) {
			break;
		}
	}

	for (;;) {
		void *pop = NULL;
		switch_event_t *event = NULL;

		if (switch_queue_pop(queue, &pop) != SWITCH_STATUS_SUCCESS) {
			break;
		}

		if (!pop) {
			break;
		}

		if (!SYSTEM_RUNNING) {
			break;
		}

		event = (switch_event_t *) pop;

		while (event) {
			for (index = 0; index < SOFT_MAX_DISPATCH; index++) {
				if (switch_queue_trypush(EVENT_DISPATCH_QUEUE[index], event) == SWITCH_STATUS_SUCCESS) {
					event = NULL;
					break;
				}
			}

			if (event) {
				if (SOFT_MAX_DISPATCH + 1 < MAX_DISPATCH) {
					switch_mutex_lock(EVENT_QUEUE_MUTEX);
					launch_dispatch_threads(SOFT_MAX_DISPATCH + 1, DISPATCH_QUEUE_LEN, RUNTIME_POOL);
					switch_mutex_unlock(EVENT_QUEUE_MUTEX);
				}
			}
		}
	}

	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	THREAD_COUNT--;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Event Thread %d Ended.\n", my_id);
	return NULL;

}


SWITCH_DECLARE(void) switch_event_deliver(switch_event_t **event)
{
	switch_event_types_t e;
	switch_event_node_t *node;

	if (SYSTEM_RUNNING) {
		switch_thread_rwlock_rdlock(RWLOCK);
		for (e = (*event)->event_id;; e = SWITCH_EVENT_ALL) {
			for (node = EVENT_NODES[e]; node; node = node->next) {
				if (switch_events_match(*event, node)) {
					(*event)->bind_user_data = node->user_data;
					node->callback(*event);
				}
			}
			
			if (e == SWITCH_EVENT_ALL) {
				break;
			}
		}
		switch_thread_rwlock_unlock(RWLOCK);
	}

	switch_event_destroy(event);
}

SWITCH_DECLARE(switch_status_t) switch_event_running(void)
{
	return SYSTEM_RUNNING ? SWITCH_STATUS_SUCCESS : SWITCH_STATUS_FALSE;
}

SWITCH_DECLARE(const char *) switch_event_name(switch_event_types_t event)
{
	switch_assert(BLOCK != NULL);
	switch_assert(RUNTIME_POOL != NULL);

	return EVENT_NAMES[event];
}

SWITCH_DECLARE(switch_status_t) switch_name_event(const char *name, switch_event_types_t *type)
{
	switch_event_types_t x;
	switch_assert(BLOCK != NULL);
	switch_assert(RUNTIME_POOL != NULL);

	for (x = 0; x <= SWITCH_EVENT_ALL; x++) {
		if ((strlen(name) > 13 && !strcasecmp(name + 13, EVENT_NAMES[x])) || !strcasecmp(name, EVENT_NAMES[x])) {
			*type = x;
			return SWITCH_STATUS_SUCCESS;
		}
	}

	return SWITCH_STATUS_FALSE;
}

SWITCH_DECLARE(switch_status_t) switch_event_free_subclass_detailed(const char *owner, const char *subclass_name)
{
	switch_event_subclass_t *subclass;
	switch_status_t status = SWITCH_STATUS_FALSE;

	switch_assert(RUNTIME_POOL != NULL);
	switch_assert(CUSTOM_HASH != NULL);

	if ((subclass = switch_core_hash_find(CUSTOM_HASH, subclass_name))) {
		if (!strcmp(owner, subclass->owner)) {
			switch_thread_rwlock_wrlock(RWLOCK);
			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Subclass reservation deleted for %s:%s\n", owner, subclass_name);
			switch_core_hash_delete(CUSTOM_HASH, subclass_name);
			FREE(subclass->owner);
			FREE(subclass->name);
			FREE(subclass);
			status = SWITCH_STATUS_SUCCESS;
			switch_thread_rwlock_unlock(RWLOCK);
		}
	}
	
	return status;
}

SWITCH_DECLARE(switch_status_t) switch_event_reserve_subclass_detailed(const char *owner, const char *subclass_name)
{
	switch_event_subclass_t *subclass;

	switch_assert(RUNTIME_POOL != NULL);
	switch_assert(CUSTOM_HASH != NULL);

	if (switch_core_hash_find(CUSTOM_HASH, subclass_name)) {
		return SWITCH_STATUS_INUSE;
	}

	switch_zmalloc(subclass, sizeof(*subclass));

	subclass->owner = DUP(owner);
	subclass->name = DUP(subclass_name);
	
	switch_core_hash_insert(CUSTOM_HASH, subclass->name, subclass);

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(void) switch_core_memory_reclaim_events(void)
{
#ifdef SWITCH_EVENT_RECYCLE

	void *pop;
	int size;
	size = switch_queue_size(EVENT_RECYCLE_QUEUE);

	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Returning %d recycled event(s) %d bytes\n", size, (int) sizeof(switch_event_t) * size);
	size = switch_queue_size(EVENT_HEADER_RECYCLE_QUEUE);
	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Returning %d recycled event header(s) %d bytes\n",
					  size, (int) sizeof(switch_event_header_t) * size);

	while (switch_queue_trypop(EVENT_HEADER_RECYCLE_QUEUE, &pop) == SWITCH_STATUS_SUCCESS && pop) {
		free(pop);
	}
	while (switch_queue_trypop(EVENT_RECYCLE_QUEUE, &pop) == SWITCH_STATUS_SUCCESS && pop) {
		free(pop);
	}
#else
	return;
#endif

}

SWITCH_DECLARE(switch_status_t) switch_event_shutdown(void)
{
	uint32_t x = 0;
	int last = 0;
	switch_hash_index_t *hi;
	const void *var;
    void *val;

	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	SYSTEM_RUNNING = 0;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	for (x = 0; x < 3; x++) {
		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Stopping event queue %d\n", x);
		switch_queue_trypush(EVENT_QUEUE[x], NULL);
		switch_queue_interrupt_all(EVENT_QUEUE[x]);
	}

	for (x = 0; x < SOFT_MAX_DISPATCH; x++) {
		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Stopping dispatch queue %d\n", x);
		switch_queue_trypush(EVENT_DISPATCH_QUEUE[x], NULL);
		switch_queue_interrupt_all(EVENT_DISPATCH_QUEUE[x]);
	}

	while (x < 10000 && THREAD_COUNT) {
		switch_cond_next();
		if (THREAD_COUNT == last) {
			x++;
		}
		last = THREAD_COUNT;
	}
	
	for (x = 0; x < SOFT_MAX_DISPATCH; x++) {
		void *pop = NULL;
        switch_event_t *event = NULL;
		switch_status_t st;

		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Stopping dispatch thread %d\n", x);
		switch_thread_join(&st, EVENT_DISPATCH_QUEUE_THREADS[x]);

		while (switch_queue_trypop(EVENT_DISPATCH_QUEUE[x], &pop) == SWITCH_STATUS_SUCCESS && pop) {
			event = (switch_event_t *) pop;
			switch_event_destroy(&event);
        }
	}

	for (x = 0; x < NUMBER_OF_QUEUES; x++) {
		void *pop = NULL;
        switch_event_t *event = NULL;
		switch_status_t st;

		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE, "Stopping queue thread %d\n", x);
		switch_thread_join(&st, EVENT_QUEUE_THREADS[x]);

		while (switch_queue_trypop(EVENT_QUEUE[x], &pop) == SWITCH_STATUS_SUCCESS && pop) {
			event = (switch_event_t *) pop;
			switch_event_destroy(&event);
        }
	}
	
	for (hi = switch_hash_first(NULL, CUSTOM_HASH); hi; hi = switch_hash_next(hi)) {
		switch_event_subclass_t *subclass;
		switch_hash_this(hi, &var, NULL, &val);
		if ((subclass = (switch_event_subclass_t *) val)) {
			FREE(subclass->name);
			FREE(subclass->owner);
			FREE(subclass);
		}
	}

	switch_core_hash_destroy(&CUSTOM_HASH);
	switch_core_memory_reclaim_events();

	return SWITCH_STATUS_SUCCESS;
}

static void launch_dispatch_threads(uint32_t max, int len, switch_memory_pool_t *pool)
{
	switch_threadattr_t *thd_attr;
	uint32_t index = 0;

	if (max > MAX_DISPATCH) {
		return;
	}

	if (max < SOFT_MAX_DISPATCH) {
		return;
	}

	for (index = SOFT_MAX_DISPATCH; index < max && index < MAX_DISPATCH; index++) {
		if (EVENT_DISPATCH_QUEUE[index]) {
			continue;
		}
		switch_queue_create(&EVENT_DISPATCH_QUEUE[index], len, pool);
		switch_threadattr_create(&thd_attr, pool);
		switch_threadattr_stacksize_set(thd_attr, SWITCH_THREAD_STACKSIZE);
		switch_threadattr_priority_increase(thd_attr);
		switch_thread_create(&EVENT_DISPATCH_QUEUE_THREADS[index], thd_attr, switch_event_dispatch_thread, EVENT_DISPATCH_QUEUE[index], pool);
		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Create event dispatch thread %d\n", index);
	}

	SOFT_MAX_DISPATCH = index;
}

SWITCH_DECLARE(switch_status_t) switch_event_init(switch_memory_pool_t *pool)
{
	switch_threadattr_t *thd_attr;;

	switch_assert(pool != NULL);
	THRUNTIME_POOL = RUNTIME_POOL = pool;
	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Activate Eventing Engine.\n");
	switch_thread_rwlock_create(&RWLOCK, RUNTIME_POOL);
	switch_mutex_init(&BLOCK, SWITCH_MUTEX_NESTED, RUNTIME_POOL);
	switch_mutex_init(&POOL_LOCK, SWITCH_MUTEX_NESTED, RUNTIME_POOL);
	switch_mutex_init(&EVENT_QUEUE_MUTEX, SWITCH_MUTEX_NESTED, RUNTIME_POOL);
	switch_core_hash_init(&CUSTOM_HASH, RUNTIME_POOL);

	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	SYSTEM_RUNNING = -1;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	switch_threadattr_create(&thd_attr, pool);
	gethostname(hostname, sizeof(hostname));
	switch_find_local_ip(guess_ip_v4, sizeof(guess_ip_v4), AF_INET);
	switch_find_local_ip(guess_ip_v6, sizeof(guess_ip_v6), AF_INET6);


	switch_queue_create(&EVENT_QUEUE[0], POOL_COUNT_MAX + 10, THRUNTIME_POOL);
	switch_queue_create(&EVENT_QUEUE[1], POOL_COUNT_MAX + 10, THRUNTIME_POOL);
	switch_queue_create(&EVENT_QUEUE[2], POOL_COUNT_MAX + 10, THRUNTIME_POOL);
#ifdef SWITCH_EVENT_RECYCLE
	switch_queue_create(&EVENT_RECYCLE_QUEUE, 250000, THRUNTIME_POOL);
	switch_queue_create(&EVENT_HEADER_RECYCLE_QUEUE, 250000, THRUNTIME_POOL);
#endif

	switch_threadattr_stacksize_set(thd_attr, SWITCH_THREAD_STACKSIZE);
	switch_threadattr_priority_increase(thd_attr);

	launch_dispatch_threads(1, DISPATCH_QUEUE_LEN, RUNTIME_POOL);
	switch_thread_create(&EVENT_QUEUE_THREADS[0], thd_attr, switch_event_thread, EVENT_QUEUE[0], RUNTIME_POOL);
	switch_thread_create(&EVENT_QUEUE_THREADS[1], thd_attr, switch_event_thread, EVENT_QUEUE[1], RUNTIME_POOL);
	switch_thread_create(&EVENT_QUEUE_THREADS[2], thd_attr, switch_event_thread, EVENT_QUEUE[2], RUNTIME_POOL);

	while (!THREAD_COUNT) {
		switch_cond_next();
	}


	switch_mutex_lock(EVENT_QUEUE_MUTEX);
	SYSTEM_RUNNING = 1;
	switch_mutex_unlock(EVENT_QUEUE_MUTEX);

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_event_create_subclass_detailed(const char *file, const char *func, int line,
																	  switch_event_t **event, switch_event_types_t event_id, const char *subclass_name)
{
#ifdef SWITCH_EVENT_RECYCLE
	void *pop;
#endif

	*event = NULL;

	if ((event_id != SWITCH_EVENT_CLONE && event_id != SWITCH_EVENT_CUSTOM) && subclass_name) {
		return SWITCH_STATUS_GENERR;
	}

#ifdef SWITCH_EVENT_RECYCLE
	if (switch_queue_trypop(EVENT_RECYCLE_QUEUE, &pop) == SWITCH_STATUS_SUCCESS && pop) {
		*event = (switch_event_t *) pop;
	} else {
#endif
		*event = ALLOC(sizeof(switch_event_t));
		switch_assert(*event);
#ifdef SWITCH_EVENT_RECYCLE
	}
#endif

	memset(*event, 0, sizeof(switch_event_t));

	if (event_id != SWITCH_EVENT_CLONE) {
		(*event)->event_id = event_id;
		switch_event_prep_for_delivery_detailed(file, func, line, *event);
	}

	if (subclass_name) {
		(*event)->subclass_name = DUP(subclass_name);
		switch_event_add_header_string(*event, SWITCH_STACK_BOTTOM, "Event-Subclass", subclass_name);
	}

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_event_set_priority(switch_event_t *event, switch_priority_t priority)
{
	event->priority = priority;
	switch_event_add_header_string(event, SWITCH_STACK_TOP, "priority", switch_priority_name(priority));
	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(char *) switch_event_get_header(switch_event_t *event, const char *header_name)
{
	switch_event_header_t *hp;
	switch_ssize_t hlen = -1;
	unsigned long hash = 0;

	switch_assert(event);

	if (!header_name) return NULL;
	
	hash = switch_ci_hashfunc_default(header_name, &hlen);
	
	for (hp = event->headers; hp; hp = hp->next) {
		if ((!hp->hash || hash == hp->hash) && !strcasecmp(hp->name, header_name) ) {
			return hp->value;
		}
	}
	return NULL;
}

SWITCH_DECLARE(char *) switch_event_get_body(switch_event_t *event)
{
	return (event ? event->body : NULL);
}

SWITCH_DECLARE(switch_status_t) switch_event_del_header(switch_event_t *event, const char *header_name)
{
	switch_event_header_t *hp, *lp = NULL, *tp;
	switch_status_t status = SWITCH_STATUS_FALSE;
	int x = 0;
	switch_ssize_t hlen = -1;
	unsigned long hash = 0;

	tp = event->headers;
	while (tp) {
		hp = tp;
		tp = tp->next;
		
		x++;
		switch_assert(x < 1000);
		hash = switch_ci_hashfunc_default(header_name, &hlen);

		if ((!hp->hash || hash == hp->hash) && !strcasecmp(header_name, hp->name)) {
			if (lp) {
				lp->next = hp->next;
			} else {
				event->headers = hp->next;
			}
			if (hp == event->last_header || !hp->next) {
				event->last_header = lp;
			}
			FREE(hp->name);
			FREE(hp->value);
			memset(hp, 0, sizeof(*hp));
#ifdef SWITCH_EVENT_RECYCLE
			if (switch_queue_trypush(EVENT_HEADER_RECYCLE_QUEUE, hp) != SWITCH_STATUS_SUCCESS) {
				FREE(hp);
			}
#else
			FREE(hp);
#endif
			status = SWITCH_STATUS_SUCCESS;
		} else {
			lp = hp;
		}
	}

	return status;
}

switch_status_t switch_event_base_add_header(switch_event_t *event, switch_stack_t stack, const char *header_name, char *data)
{
	switch_event_header_t *header;
	switch_ssize_t hlen = -1;

#ifdef SWITCH_EVENT_RECYCLE
	void *pop;
	if (switch_queue_trypop(EVENT_HEADER_RECYCLE_QUEUE, &pop) == SWITCH_STATUS_SUCCESS) {
		header = (switch_event_header_t *) pop;
	} else {
#endif
		header = ALLOC(sizeof(*header));
		switch_assert(header);
#ifdef SWITCH_EVENT_RECYCLE
	}
#endif

	memset(header, 0, sizeof(*header));

	header->name = DUP(header_name);
	header->value = data;
	header->hash = switch_ci_hashfunc_default(header->name, &hlen);
	
	if (stack == SWITCH_STACK_TOP) {
		header->next = event->headers;
		event->headers = header;
		if (!event->last_header) {
			event->last_header = header;
		}
	} else {
		if (event->last_header) {
			event->last_header->next = header;
		} else {
			event->headers = header;
			header->next = NULL;
		}
		event->last_header = header;
	}

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_event_add_header(switch_event_t *event, switch_stack_t stack, const char *header_name, const char *fmt, ...)
{
	int ret = 0;
	char *data;
	va_list ap;

	va_start(ap, fmt);
	ret = switch_vasprintf(&data, fmt, ap);
	va_end(ap);

	if (ret == -1) {
		return SWITCH_STATUS_MEMERR;
	}

	return switch_event_base_add_header(event, stack, header_name, data);
}

SWITCH_DECLARE(switch_status_t) switch_event_add_header_string(switch_event_t *event, switch_stack_t stack, const char *header_name, const char *data)
{
	if (data) {
		return switch_event_base_add_header(event, stack, header_name, DUP(data));
	}
	return SWITCH_STATUS_GENERR;
}

SWITCH_DECLARE(switch_status_t) switch_event_add_body(switch_event_t *event, const char *fmt, ...)
{
	int ret = 0;
	char *data;

	va_list ap;
	if (fmt) {
		va_start(ap, fmt);
		ret = switch_vasprintf(&data, fmt, ap);
		va_end(ap);

		if (ret == -1) {
			return SWITCH_STATUS_GENERR;
		} else {
			switch_safe_free(event->body);
			event->body = data;
			return SWITCH_STATUS_SUCCESS;
		}
	} else {
		return SWITCH_STATUS_GENERR;
	}
}

SWITCH_DECLARE(void) switch_event_destroy(switch_event_t **event)
{
	switch_event_t *ep = *event;
	switch_event_header_t *hp, *this;

	if (ep) {
		for (hp = ep->headers; hp;) {
			this = hp;
			hp = hp->next;
			FREE(this->name);
			FREE(this->value);
#ifdef SWITCH_EVENT_RECYCLE
			if (switch_queue_trypush(EVENT_HEADER_RECYCLE_QUEUE, this) != SWITCH_STATUS_SUCCESS) {
				FREE(this);
			}
#else
			FREE(this);
#endif


		}
		FREE(ep->body);
		FREE(ep->subclass_name);
#ifdef SWITCH_EVENT_RECYCLE
		if (switch_queue_trypush(EVENT_RECYCLE_QUEUE, ep) != SWITCH_STATUS_SUCCESS) {
			FREE(ep);
		}
#else
		FREE(ep);
#endif

	}
	*event = NULL;
}

SWITCH_DECLARE(switch_status_t) switch_event_dup(switch_event_t **event, switch_event_t *todup)
{
	switch_event_header_t *hp;

	if (switch_event_create_subclass(event, SWITCH_EVENT_CLONE, todup->subclass_name) != SWITCH_STATUS_SUCCESS) {
		return SWITCH_STATUS_GENERR;
	}

	(*event)->event_id = todup->event_id;
	(*event)->event_user_data = todup->event_user_data;
	(*event)->bind_user_data = todup->bind_user_data;

	for (hp = todup->headers; hp; hp = hp->next) {
		switch_event_add_header_string(*event, SWITCH_STACK_BOTTOM, hp->name, hp->value);
	}

	if (todup->body) {
		(*event)->body = DUP(todup->body);
	}

	(*event)->key = todup->key;

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_event_serialize(switch_event_t *event, char **str, switch_bool_t encode)
{
	switch_size_t len = 0;
	switch_event_header_t *hp;
	switch_size_t llen = 0, dlen = 0, blocksize = 512, encode_len = 1536, new_len = 0;
	char *buf;
	char *encode_buf = NULL;	/* used for url encoding of variables to make sure unsafe things stay out of the serialized copy */

	*str = NULL;

	dlen = blocksize * 2;

	if (!(buf = malloc(dlen))) {
		return SWITCH_STATUS_MEMERR;
	}

	/* go ahead and give ourselves some space to work with, should save a few reallocs */
	if (!(encode_buf = malloc(encode_len))) {
		switch_safe_free(buf);
		return SWITCH_STATUS_MEMERR;
	}

	/* switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "hit serialized!.\n"); */
	for (hp = event->headers; hp; hp = hp->next) {
		/*
		 * grab enough memory to store 3x the string (url encode takes one char and turns it into %XX)
		 * so we could end up with a string that is 3 times the originals length, unlikely but rather
		 * be safe than destroy the string, also add one for the null.  And try to be smart about using 
		 * the memory, allocate and only reallocate if we need more.  This avoids an alloc, free CPU
		 * destroying loop.
		 */

		new_len = (strlen(hp->value) * 3) + 1;

		if (encode_len < new_len) {
			char *tmp;
			/* switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Allocing %d was %d.\n", ((strlen(hp->value) * 3) + 1), encode_len); */
			/* we can use realloc for initial alloc as well, if encode_buf is zero it treats it as a malloc */

			/* keep track of the size of our allocation */
			encode_len = new_len;

			if (!(tmp = realloc(encode_buf, encode_len))) {
				/* oh boy, ram's gone, give back what little we grabbed and bail */
				switch_safe_free(buf);
				switch_safe_free(encode_buf);
				return SWITCH_STATUS_MEMERR;
			}

			encode_buf = tmp;
		}

		/* handle any bad things in the string like newlines : etc that screw up the serialized format */
		if (encode) {
			switch_url_encode(hp->value, encode_buf, encode_len);
		} else {
			switch_snprintf(encode_buf, encode_len, "[%s]", hp->value);
		}

		llen = strlen(hp->name) + strlen(encode_buf) + 8;

		if ((len + llen) > dlen) {
			char *m;
			dlen += (blocksize + (len + llen));
			if ((m = realloc(buf, dlen))) {
				buf = m;
			} else {
				/* we seem to be out of memory trying to resize the serialize string, give back what we already have and give up */
				switch_safe_free(buf);
				switch_safe_free(encode_buf);
				return SWITCH_STATUS_MEMERR;
			}
		}

		switch_snprintf(buf + len, dlen - len, "%s: %s\n", hp->name, *encode_buf == '\0' ? "_undef_" : encode_buf);
		len = strlen(buf);
	}

	/* we are done with the memory we used for encoding, give it back */
	switch_safe_free(encode_buf);

	if (event->body) {
		int blen = (int) strlen(event->body);
		llen = blen;

		if (blen) {
			llen += 25;
		} else {
			llen += 5;
		}

		if ((len + llen) > dlen) {
			char *m;
			dlen += (blocksize + (len + llen));
			if ((m = realloc(buf, dlen))) {
				buf = m;
			} else {
				switch_safe_free(buf);
				return SWITCH_STATUS_MEMERR;
			}
		}

		if (blen) {
			switch_snprintf(buf + len, dlen - len, "Content-Length: %d\n\n%s", blen, event->body);
		} else {
			switch_snprintf(buf + len, dlen - len, "\n");
		}
	} else {
		switch_snprintf(buf + len, dlen - len, "\n");
	}

	*str = buf;

	return SWITCH_STATUS_SUCCESS;
}

static switch_xml_t add_xml_header(switch_xml_t xml, char *name, char *value, int offset)
{
	switch_xml_t header = switch_xml_add_child_d(xml, name, offset);
	
	if (header) {
		switch_size_t encode_len = (strlen(value) * 3) + 1;
		char *encode_buf = malloc(encode_len);
		
		switch_assert(encode_buf);
 
		memset(encode_buf, 0, encode_len);
		switch_url_encode((char *) value, encode_buf, encode_len);
		switch_xml_set_txt_d(header, encode_buf);
		free(encode_buf);
	}
	
	return header;
}

SWITCH_DECLARE(switch_xml_t) switch_event_xmlize(switch_event_t *event, const char *fmt, ...)
{
	switch_event_header_t *hp;
	char *data = NULL, *body = NULL;
	int ret = 0;
	switch_xml_t xml = NULL;
	uint32_t off = 0;
	va_list ap;
	switch_xml_t xheaders = NULL;

	if (!(xml = switch_xml_new("event"))) {
		return xml;
	}

	if (fmt) {
		va_start(ap, fmt);
#ifdef HAVE_VASPRINTF
		ret = vasprintf(&data, fmt, ap);
#else
		data = (char *) malloc(2048);
		if (!data)
			return NULL;
		ret = vsnprintf(data, 2048, fmt, ap);
#endif
		va_end(ap);
		if (ret == -1) {
#ifndef HAVE_VASPRINTF
			free(data);
#endif
			return NULL;
		}
	}

	if ((xheaders = switch_xml_add_child_d(xml, "headers", off++))) {
		int hoff = 0;
		for (hp = event->headers; hp; hp = hp->next) {
			add_xml_header(xheaders, hp->name, hp->value, hoff++);
		}
	}

	if (!switch_strlen_zero(data)) {
		body = data;
	} else if (event->body) {
		body = event->body;
	}

	if (body) {
		int blen = (int) strlen(body);
		char blena[25];
		switch_snprintf(blena, sizeof(blena), "%d", blen);
		if (blen) {
			switch_xml_t xbody = NULL;

			add_xml_header(xml, "Content-Length", blena, off++);
			if ((xbody = switch_xml_add_child_d(xml, "body", off++))) {
				switch_xml_set_txt_d(xbody, body);
			}
		}
	}

	if (data) {
		free(data);
	}

	return xml;
}

SWITCH_DECLARE(void) switch_event_prep_for_delivery_detailed(const char *file, const char *func, int line, switch_event_t *event)
{
	switch_time_exp_t tm;
	char date[80] = "";
	switch_size_t retsize;
	switch_time_t ts = switch_micro_time_now();


	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Event-Name", switch_event_name(event->event_id));
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Core-UUID", switch_core_get_uuid());
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "FreeSWITCH-Hostname", hostname);
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "FreeSWITCH-IPv4", guess_ip_v4);
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "FreeSWITCH-IPv6", guess_ip_v6);

	switch_time_exp_lt(&tm, ts);
	switch_strftime_nocheck(date, &retsize, sizeof(date), "%Y-%m-%d %T", &tm);
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Event-Date-Local", date);
	switch_rfc822_date(date, ts);
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Event-Date-GMT", date);
	switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Event-Date-Timestamp", "%" SWITCH_UINT64_T_FMT, (uint64_t) ts);
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Event-Calling-File", switch_cut_path(file));
	switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Event-Calling-Function", func);
	switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Event-Calling-Line-Number", "%d", line);


}

SWITCH_DECLARE(switch_status_t) switch_event_fire_detailed(const char *file, const char *func, int line, switch_event_t **event, void *user_data)
{

	
	switch_assert(BLOCK != NULL);
	switch_assert(RUNTIME_POOL != NULL);
	switch_assert(EVENT_QUEUE_MUTEX != NULL);
	switch_assert(RUNTIME_POOL != NULL);

	if (SYSTEM_RUNNING <= 0) {
		/* sorry we're closed */
		switch_event_destroy(event);
		return SWITCH_STATUS_SUCCESS;
	}

	if (user_data) {
		(*event)->event_user_data = user_data;
	}


	switch_queue_push(EVENT_QUEUE[(*event)->priority], *event);
	*event = NULL;

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_event_bind_removable(const char *id, switch_event_types_t event, const char *subclass_name, 
															switch_event_callback_t callback, void *user_data, switch_event_node_t **node)
{
	switch_event_node_t *event_node;
	switch_event_subclass_t *subclass = NULL;

	switch_assert(BLOCK != NULL);
	switch_assert(RUNTIME_POOL != NULL);

	if (node) {
		*node = NULL;
	}

	if (subclass_name) {
		if (!(subclass = switch_core_hash_find(CUSTOM_HASH, subclass_name))) {
			switch_event_reserve_subclass_detailed(id, subclass_name);
			subclass = switch_core_hash_find(CUSTOM_HASH, subclass_name);
		}
		if (!subclass) {
			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Could not reserve subclass. '%s'\n", subclass_name);
			return SWITCH_STATUS_FALSE;
		}
	}
	
	if (event <= SWITCH_EVENT_ALL) {
		switch_zmalloc(event_node, sizeof(*event_node));
		switch_mutex_lock(BLOCK);
		switch_thread_rwlock_wrlock(RWLOCK);
		/* <LOCKED> ----------------------------------------------- */
		event_node->id = DUP(id);
		event_node->event_id = event;
		event_node->subclass = subclass;
		event_node->callback = callback;
		event_node->user_data = user_data;

		if (EVENT_NODES[event]) {
			event_node->next = EVENT_NODES[event];
		}

		EVENT_NODES[event] = event_node;
		switch_thread_rwlock_unlock(RWLOCK);
		switch_mutex_unlock(BLOCK);
		/* </LOCKED> ----------------------------------------------- */

		if (node) {
			*node = event_node;
		}

		return SWITCH_STATUS_SUCCESS;
	}

	return SWITCH_STATUS_MEMERR;
}


SWITCH_DECLARE(switch_status_t) switch_event_bind(const char *id, switch_event_types_t event, const char *subclass_name, 
												  switch_event_callback_t callback, void *user_data) 
{
	return switch_event_bind_removable(id, event, subclass_name, callback, user_data, NULL);
}


SWITCH_DECLARE(switch_status_t) switch_event_unbind_callback(switch_event_callback_t callback)
{
	switch_event_node_t *n, *np, *lnp = NULL;
	switch_status_t status = SWITCH_STATUS_FALSE;
	int id;

	switch_thread_rwlock_wrlock(RWLOCK);
	switch_mutex_lock(BLOCK);
	/* <LOCKED> ----------------------------------------------- */
	for (id = 0; id < SWITCH_EVENT_ALL; id++) {
		lnp = NULL;

		for (np = EVENT_NODES[id]; np;) {
			n = np;
			np = np->next;
			if (n->callback == callback) {
				if (lnp) {
					lnp->next = n->next;
				} else {
					EVENT_NODES[n->event_id] = n->next;
				}
				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Event Binding deleted for %s:%s\n", n->id, switch_event_name(n->event_id));
				if (n->subclass) {
					FREE(n->subclass->owner);
					FREE(n->subclass->name);
					FREE(n->subclass);
				}
				FREE(n->id);
				FREE(n);
				status = SWITCH_STATUS_SUCCESS;
			} else {
				lnp = n;
			}
		}
	}
	switch_mutex_unlock(BLOCK);
	switch_thread_rwlock_unlock(RWLOCK);
	/* </LOCKED> ----------------------------------------------- */

	return status;
}



SWITCH_DECLARE(switch_status_t) switch_event_unbind(switch_event_node_t **node)
{
	switch_event_node_t *n, *np, *lnp = NULL;
	switch_status_t status = SWITCH_STATUS_FALSE;

	n = *node;

	if (!n) {
		return status;
	}

	switch_thread_rwlock_wrlock(RWLOCK);
	switch_mutex_lock(BLOCK);
	/* <LOCKED> ----------------------------------------------- */
	for (np = EVENT_NODES[n->event_id]; np; np = np->next) {
		if (np == n) {
			if (lnp) {
				lnp->next = n->next;
			} else {
				EVENT_NODES[n->event_id] = n->next;
			}
			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Event Binding deleted for %s:%s\n", n->id, switch_event_name(n->event_id));
			n->subclass = NULL;
			FREE(n->id);
			FREE(n);
			*node = NULL;
			status = SWITCH_STATUS_SUCCESS;
			break;
		}
		lnp = np;
	}
	switch_mutex_unlock(BLOCK);
	switch_thread_rwlock_unlock(RWLOCK);
	/* </LOCKED> ----------------------------------------------- */

	return status;
}

SWITCH_DECLARE(switch_status_t) switch_event_create_pres_in_detailed(char *file, char *func, int line,
																	 const char *proto, const char *login,
																	 const char *from, const char *from_domain,
																	 const char *status, const char *event_type,
																	 const char *alt_event_type, int event_count,
																	 const char *unique_id, const char *channel_state,
																	 const char *answer_state, const char *call_direction)
{
	switch_event_t *pres_event;

	if (switch_event_create_subclass(&pres_event, SWITCH_EVENT_PRESENCE_IN, SWITCH_EVENT_SUBCLASS_ANY) == SWITCH_STATUS_SUCCESS) {
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "proto", proto);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "login", login);
		switch_event_add_header(pres_event, SWITCH_STACK_TOP, "from", "%s@%s", from, from_domain);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "status", status);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "event_type", event_type);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "alt_event_type", alt_event_type);
		switch_event_add_header(pres_event, SWITCH_STACK_TOP, "event_count", "%d", event_count);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "unique-id", alt_event_type);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "channel-state", channel_state);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "answer-state", answer_state);
		switch_event_add_header_string(pres_event, SWITCH_STACK_TOP, "presence-call-direction", call_direction);
		switch_event_fire_detailed(file, func, line, &pres_event, NULL);
		return SWITCH_STATUS_SUCCESS;
	}
	return SWITCH_STATUS_MEMERR;
}

#define resize(l) {\
char *dp;\
olen += (len + l + block);\
cpos = c - data;\
if ((dp = realloc(data, olen))) {\
    data = dp;\
    c = data + cpos;\
    memset(c, 0, olen - cpos);\
 }}                           \

SWITCH_DECLARE(char *) switch_event_expand_headers(switch_event_t *event, const char *in)
{
	char *p, *c = NULL;
	char *data, *indup, *endof_indup;
	size_t sp = 0, len = 0, olen = 0, vtype = 0, br = 0, cpos, block = 128;
	const char *sub_val = NULL;
	char *cloned_sub_val = NULL;
	char *func_val = NULL;
	int nv = 0;

	nv = switch_string_var_check_const(in);

	if (!nv) {
		return (char *) in;
	}

	nv = 0;
	olen = strlen(in) + 1;
	indup = strdup(in);
	endof_indup = end_of_p(indup) + 1;

	if ((data = malloc(olen))) {
		memset(data, 0, olen);
		c = data;
		for (p = indup; p && p < endof_indup && *p; p++) {
			vtype = 0;

			if (*p == '\\') {
				if (*(p + 1) == '$') {
					nv = 1;
				} else if (*(p + 1) == '\\') {
					*c++ = *p++;
					len++;
					continue;
				}
				p++;
			}

			if (*p == '$' && !nv) {
				if (*(p + 1)) {
					if (*(p + 1) == '{') {
						vtype = 1;
					} else {
						nv = 1;
					}
				} else {
					nv = 1;
				}
			}

			if (nv) {
				*c++ = *p;
				len++;
				nv = 0;
				continue;
			}

			if (vtype) {
				char *s = p, *e, *vname, *vval = NULL;
				size_t nlen;

				s++;

				if (vtype == 1 && *s == '{') {
					br = 1;
					s++;
				}

				e = s;
				vname = s;
				while (*e) {
					if (br == 1 && *e == '}') {
						br = 0;
						*e++ = '\0';
						break;
					}

					if (br > 0) {
						if (e != s && *e == '{') {
							br++;
						} else if (br > 1 && *e == '}') {
							br--;
						}
					}

					e++;
				}
				p = e > endof_indup ? endof_indup : e;

				if ((vval = strchr(vname, '('))) {
					e = vval - 1;
					*vval++ = '\0';
					while (*e == ' ') {
						*e-- = '\0';
					}
					e = vval;
					br = 1;
					while (e && *e) {
						if (*e == '(') {
							br++;
						} else if (br > 1 && *e == ')') {
							br--;
						} else if (br == 1 && *e == ')') {
							*e = '\0';
							break;
						}
						e++;
					}

					vtype = 2;
				}

				if (vtype == 1) {
					char *expanded = NULL;
					int offset = 0;
					int ooffset = 0;
					char *ptr;

					if ((expanded = switch_event_expand_headers(event, (char *) vname)) == vname) {
						expanded = NULL;
					} else {
						vname = expanded;
					}
					if ((ptr = strchr(vname, ':'))) {
						*ptr++ = '\0';
						offset = atoi(ptr);
						if ((ptr = strchr(ptr, ':'))) {
							ptr++;
							ooffset = atoi(ptr);
						}
					}

					if (!(sub_val = switch_event_get_header(event, vname))) {
						sub_val = switch_core_get_variable(vname);
					}

					if (offset || ooffset) {
						cloned_sub_val = strdup(sub_val);
						switch_assert(cloned_sub_val);
						sub_val = cloned_sub_val;
					}

					if (offset >= 0) {
						sub_val += offset;
					} else if ((size_t) abs(offset) <= strlen(sub_val)) {
						sub_val = cloned_sub_val + (strlen(cloned_sub_val) + offset);
					}

					if (ooffset > 0 && (size_t) ooffset < strlen(sub_val)) {
						if ((ptr = (char *) sub_val + ooffset)) {
							*ptr = '\0';
						}
					}

					switch_safe_free(expanded);
				} else {
					switch_stream_handle_t stream = { 0 };
					char *expanded = NULL;

					SWITCH_STANDARD_STREAM(stream);

					if (stream.data) {
						char *expanded_vname = NULL;

						if ((expanded_vname = switch_event_expand_headers(event, (char *) vname)) == vname) {
							expanded_vname = NULL;
						} else {
							vname = expanded_vname;
						}

						if ((expanded = switch_event_expand_headers(event, vval)) == vval) {
							expanded = NULL;
						} else {
							vval = expanded;
						}

						if (switch_api_execute(vname, vval, NULL, &stream) == SWITCH_STATUS_SUCCESS) {
							func_val = stream.data;
							sub_val = func_val;
						} else {
							free(stream.data);
						}

						switch_safe_free(expanded);
						switch_safe_free(expanded_vname);

					} else {
						switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Memory Error!\n");
						free(data);
						free(indup);
						return (char *) in;
					}
				}
				if ((nlen = sub_val ? strlen(sub_val) : 0)) {
					if (len + nlen >= olen) {
						resize(nlen);
					}

					len += nlen;
					strcat(c, sub_val);
					c += nlen;
				}

				switch_safe_free(func_val);
				switch_safe_free(cloned_sub_val);
				sub_val = NULL;
				vname = NULL;
				vtype = 0;
				br = 0;
			}
			if (len + 1 >= olen) {
				resize(1);
			}

			if (sp) {
				*c++ = ' ';
				sp = 0;
				len++;
			}

			if (*p == '$') {
				p--;
			} else {
				*c++ = *p;
				len++;
			}
		}
	}
	free(indup);

	return data;
}

SWITCH_DECLARE(char *) switch_event_build_param_string(switch_event_t *event, const char *prefix, switch_hash_t *vars_map)
{
	switch_stream_handle_t stream = { 0 };
	switch_size_t encode_len = 1024, new_len = 0;
	char *encode_buf = NULL;
	const char *prof[12] = { 0 }, *prof_names[12] = {
	0};
	char *e = NULL;
	switch_event_header_t *hi;
	uint32_t x = 0;
	void *data = NULL;

	SWITCH_STANDARD_STREAM(stream);

	if (prefix) {
		stream.write_function(&stream, "%s&", prefix);
	}

	encode_buf = malloc(encode_len);
	switch_assert(encode_buf);



	for (x = 0; prof[x]; x++) {
		if (switch_strlen_zero(prof[x])) {
			continue;
		}
		new_len = (strlen(prof[x]) * 3) + 1;
		if (encode_len < new_len) {
			char *tmp;

			encode_len = new_len;

			if (!(tmp = realloc(encode_buf, encode_len))) {
				abort();
			}

			encode_buf = tmp;
		}
		switch_url_encode(prof[x], encode_buf, encode_len);
		stream.write_function(&stream, "%s=%s&", prof_names[x], encode_buf);
	}

	if (event) {
		if ((hi = event->headers)) {

			for (; hi; hi = hi->next) {
				char *var = hi->name;
				char *val = hi->value;

				if (vars_map != NULL) {
					if ((data = switch_core_hash_find(vars_map, var)) == NULL || strcasecmp(((char *) data), "enabled"))
						continue;

				}

				new_len = (strlen((char *) var) * 3) + 1;
				if (encode_len < new_len) {
					char *tmp;

					encode_len = new_len;

					tmp = realloc(encode_buf, encode_len);
					switch_assert(tmp);
					encode_buf = tmp;
				}

				switch_url_encode((char *) val, encode_buf, encode_len);
				stream.write_function(&stream, "%s=%s&", (char *) var, encode_buf);

			}
		}
	}

	e = (char *) stream.data + (strlen((char *) stream.data) - 1);

	if (e && *e == '&') {
		*e = '\0';
	}

	switch_safe_free(encode_buf);

	return stream.data;
}

/* For Emacs:
 * Local Variables:
 * mode:c
 * indent-tabs-mode:t
 * tab-width:4
 * c-basic-offset:4
 * End:
 * For VIM:
 * vim:set softtabstop=4 shiftwidth=4 tabstop=4:
 */
