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+/*
+ en50221 encoder An implementation for libdvb
+ an implementation for the en50221 session layer
+
+ Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
+ Copyright (C) 2005 Julian Scheel (julian@jusst.de)
+ Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of
+ the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+
+#ifndef __EN50221_SESSION_H__
+#define __EN50221_SESSION_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <libdvben50221/en50221_transport.h>
+
+#define S_SCALLBACK_REASON_CAMCONNECTING 0x00 // CAM originated session connecting to resource (check for availability)
+#define S_SCALLBACK_REASON_CAMCONNECTED 0x01 // CAM originated session connection established succesfully
+#define S_SCALLBACK_REASON_CAMCONNECTFAIL 0x02 // CAM originated session connection failed
+#define S_SCALLBACK_REASON_CONNECTED 0x03 // Host originated session ACKed by CAM.
+#define S_SCALLBACK_REASON_CONNECTFAIL 0x04 // Host originated session NACKed by CAM.
+#define S_SCALLBACK_REASON_CLOSE 0x05 // Session closed
+#define S_SCALLBACK_REASON_TC_CONNECT 0x06 // A host originated transport connection has been established.
+#define S_SCALLBACK_REASON_TC_CAMCONNECT 0x07 // A CAM originated transport connection has been established.
+
+
+/**
+ * Opaque type representing a session layer.
+ */
+struct en50221_session_layer;
+
+/**
+ * Type definition for resource callback function - called by session layer when data
+ * arrives for a particular resource.
+ *
+ * @param arg Private argument.
+ * @param slot_id Slot id concerned.
+ * @param session_number Session number.
+ * @param resource_id Resource id.
+ * @param data The data.
+ * @param data_length Length of data in bytes.
+ * @return 0 on success, or -1 on failure.
+ */
+typedef int (*en50221_sl_resource_callback) (void *arg,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint32_t resource_id,
+ uint8_t * data,
+ uint32_t data_length);
+
+/**
+ * Type definition for resource lookup callback function - used by the session layer to
+ * look up requested resources.
+ *
+ * @param arg Private argument.
+ * @param slot_id Slot id the request came from.
+ * @param requested_resource_id Resource id requested.
+ * @param callback_out Output parameter for pointer to resource callback function.
+ * @param arg_out Output parameter for arg to pass to resource callback.
+ * @param resource_id_out Set this to the resource_id connected to (e.g. may differ from resource_id due to versions).
+ * @return 0 on success,
+ * -1 if the resource was not found,
+ * -2 if it exists, but had a lower version, or
+ * -3 if it exists, but was unavailable.
+ */
+typedef int (*en50221_sl_lookup_callback) (void *arg,
+ uint8_t slot_id,
+ uint32_t requested_resource_id,
+ en50221_sl_resource_callback * callback_out,
+ void **arg_out,
+ uint32_t *resource_id_out);
+
+
+/**
+ * Type definition for session callback function - used to inform top level code when a CAM
+ * modifies a session to a resource.
+ *
+ * @param arg Private argument.
+ * @param reason One of the S_CCALLBACK_REASON_* values above.
+ * @param slot_id Slot id concerned.
+ * @param session_number Session number.
+ * @param resource_id Resource id.
+ * @return 0 on sucess, or -1 on error.
+ */
+typedef int (*en50221_sl_session_callback) (void *arg, int reason,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint32_t resource_id);
+
+/**
+ * Construct a new instance of the session layer.
+ *
+ * @param tl The en50221_transport_layer instance to use.
+ * @param max_sessions Maximum number of sessions supported.
+ * @return The en50221_session_layer instance, or NULL on error.
+ */
+extern struct en50221_session_layer *en50221_sl_create(struct en50221_transport_layer *tl,
+ uint32_t max_sessions);
+
+/**
+ * Destroy an instance of the session layer.
+ *
+ * @param tl The en50221_session_layer instance.
+ */
+extern void en50221_sl_destroy(struct en50221_session_layer *sl);
+
+/**
+ * Gets the last error.
+ *
+ * @param tl The en50221_session_layer instance.
+ * @return One of the EN50221ERR_* values.
+ */
+extern int en50221_sl_get_error(struct en50221_session_layer *tl);
+
+/**
+ * Register the callback for resource lookup.
+ *
+ * @param sl The en50221_session_layer instance.
+ * @param callback The callback. Set to NULL to remove the callback completely.
+ * @param arg Private data passed as arg0 of the callback.
+ */
+extern void en50221_sl_register_lookup_callback(struct en50221_session_layer *sl,
+ en50221_sl_lookup_callback callback,
+ void *arg);
+
+/**
+ * Register the callback for informing about session from a cam.
+ *
+ * @param sl The en50221_session_layer instance.
+ * @param callback The callback. Set to NULL to remove the callback completely.
+ * @param arg Private data passed as arg0 of the callback.
+ */
+extern void en50221_sl_register_session_callback(struct en50221_session_layer *sl,
+ en50221_sl_session_callback callback,
+ void *arg);
+
+/**
+ * Create a new session to a module in a slot.
+ *
+ * @param sl The en50221_session_layer instance.
+ * @param slot The slot to connect to.
+ * @param resource_id The resource_id to connect to.
+ * @param callback The callback for received data.
+ * @param arg Argument to pass to the callback.
+ * @return The new session_number, or -1 on error.
+ */
+extern int en50221_sl_create_session(struct en50221_session_layer *sl, int slot_id,
+ uint8_t connection_id,
+ uint32_t resource_id,
+ en50221_sl_resource_callback callback,
+ void *arg);
+
+/**
+ * Destroy a session.
+ *
+ * @param sl The en50221_session_layer instance.
+ * @param session_number The session to destroy.
+ * @return 0 on success, or -1 on error.
+ */
+extern int en50221_sl_destroy_session(struct en50221_session_layer *sl,
+ uint16_t session_number);
+
+/**
+ * this function is used to take a data-block, pack into
+ * into a SPDU (SESSION_NUMBER) and send it to the transport layer
+ *
+ * @param sl The en50221_session_layer instance to use.
+ * @param session_number Session number concerned.
+ * @param data Data to send.
+ * @param data_length Length of data in bytes.
+ * @return 0 on success, or -1 on error.
+ */
+extern int en50221_sl_send_data(struct en50221_session_layer *sl,
+ uint16_t session_number,
+ uint8_t * data,
+ uint16_t data_length);
+
+/**
+ * this function is used to take a data-block, pack into
+ * into a SPDU (SESSION_NUMBER) and send it to the transport layer
+ *
+ * @param sl The en50221_session_layer instance to use.
+ * @param session_number Session number concerned.
+ * @param vector IOVEC to send.
+ * @param iov_count Number of elements in io vector.
+ * @return 0 on success, or -1 on error.
+ */
+extern int en50221_sl_send_datav(struct en50221_session_layer *sl,
+ uint16_t session_number,
+ struct iovec *vector,
+ int iov_count);
+
+/**
+ * this is used to send a message to all sessions, linked
+ * to resource res
+ *
+ * @param tl The en50221_session_layer instance to use.
+ * @param slot_id Set to -1 to send to any slot. Other values will send to only that slot.
+ * @param resource_id Resource id concerned.
+ * @param data Data to send.
+ * @param data_length Length of data in bytes.
+ * @return 0 on success, or -1 on error.
+ */
+extern int en50221_sl_broadcast_data(struct en50221_session_layer *sl,
+ int slot_id,
+ uint32_t resource_id,
+ uint8_t * data,
+ uint16_t data_length);
+
+#ifdef __cplusplus
+}
+#endif
+#endif