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/*
en50221 encoder An implementation for libdvb
an implementation for the en50221 transport layer
Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
Copyright (C) 2005 Julian Scheel (julian at jusst dot 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_APP_UTILS_H__
#define __EN50221_APP_UTILS_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#include <stdint.h>
#include <sys/uio.h>
/**
* A decomposed public resource structure.
*
* we will ignore private resource (resource_id_type==3),
* because they are not used by any modules at all and
* would need special code for any private resource anyway.
*/
struct en50221_app_public_resource_id {
uint16_t resource_class;
uint16_t resource_type;
uint8_t resource_version;
};
typedef int (*en50221_send_data) (void *arg,
uint16_t session_number,
uint8_t * data,
uint16_t data_length);
typedef int (*en50221_send_datav) (void *arg,
uint16_t session_number,
struct iovec * vector,
int iov_count);
/**
* An abstraction away from hardcoded send functions so different layers may be
* slotted in under the application layer.
*/
struct en50221_app_send_functions {
/**
* Argument to pass to these functions.
*/
void *arg;
/**
* Send data.
*/
en50221_send_data send_data;
/**
* Send vector data.
*/
en50221_send_datav send_datav;
};
/**
* Make a host-endian uint32_t formatted resource id.
*
* @param CLASS Class of resource.
* @param TYPE Type of resource.
* @param VERSION Version of resource.
* @return Formatted resource id.
*/
#define MKRID(CLASS, TYPE, VERSION) ((((CLASS)&0xffff)<<16) | (((TYPE)&0x3ff)<<6) | ((VERSION)&0x3f))
/**
* Decode a host-endian public resource_id into an en50221_app_public_resource_id structure.
*
* @param idf Structure to write decoded resource_id into.
* @param resource_id ID to decode.
* @return Pointer to idf on success, or NULL if this is not a public resource.
*/
struct en50221_app_public_resource_id *
en50221_app_decode_public_resource_id(struct en50221_app_public_resource_id *idf,
uint32_t resource_id);
/**
* Encode an en50221_app_public_resource_id structure into a host-endian uint32_t.
*
* @param idf Structure to encode.
* @return The encoded value
*/
static inline uint32_t en50221_app_encode_public_resource_id(struct en50221_app_public_resource_id *idf) {
return MKRID(idf->resource_class, idf->resource_type, idf->resource_version);
}
#ifdef __cplusplus
}
#endif
#endif
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