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/*
* section and descriptor parser
*
* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
* Copyright (C) 2005 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 library 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _UCSI_DVB_CONTENT_IDENTIFIER_DESCRIPTOR
#define _UCSI_DVB_CONTENT_IDENTIFIER_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* Possible values for the crid_type.
*/
enum {
DVB_CRID_TYPE_NONE = 0x00,
DVB_CRID_TYPE_ITEM = 0x01,
DVB_CRID_TYPE_SERIES = 0x02,
DVB_CRID_TYPE_RECOMMENDATION = 0x03,
};
/**
* Possible values for the crid_location.
*/
enum {
DVB_CRID_LOCATION_THIS_DESCRIPTOR = 0x00,
DVB_CRID_LOCATION_CIT = 0x01,
};
/**
* dvb_content_identifier_descriptor structure.
*/
struct dvb_content_identifier_descriptor {
struct descriptor d;
/* struct dvb_content_identifier_entry entries[] */
} __ucsi_packed;
/**
* An entry in the entries field of a dvb_content_identifier_descriptor.
*/
struct dvb_content_identifier_entry {
EBIT2(uint8_t crid_type : 6; ,
uint8_t crid_location : 2; );
/* struct dvb_content_identifier_data_00 data0 */
/* struct dvb_content_identifier_data_01 data1 */
} __ucsi_packed;
/**
* The data if crid_location == 0
*/
struct dvb_content_identifier_entry_data_0 {
uint8_t crid_length;
/* uint8_t data[] */
} __ucsi_packed;
/**
* The data if crid_location == 1
*/
struct dvb_content_identifier_entry_data_1 {
uint16_t crid_ref;
} __ucsi_packed;
/**
* Process a dvb_content_identifier_descriptor.
*
* @param d Generic descriptor.
* @return dvb_content_identifier_descriptor pointer, or NULL on error.
*/
static inline struct dvb_content_identifier_descriptor*
dvb_content_identifier_descriptor_codec(struct descriptor* d)
{
uint32_t len = d->len + 2;
uint32_t pos = 2;
uint8_t *buf = (uint8_t*) d;
while(pos < len) {
struct dvb_content_identifier_entry *e =
(struct dvb_content_identifier_entry*) (buf + pos);
if (len < (pos+1))
return NULL;
pos++;
switch(e->crid_location) {
case 0:
if (len < (pos + 1))
return NULL;
if (len < (pos + 1 + buf[pos]))
return NULL;
pos += 1 + buf[pos];
break;
case 1:
if (len < (pos+2))
return NULL;
bswap16(buf+pos);
break;
}
}
if (pos != len)
return NULL;
return (struct dvb_content_identifier_descriptor*) d;
}
/**
* Iterator for entries field of a dvb_content_identifier_descriptor.
*
* @param d dvb_content_identifier_descriptor pointer.
* @param pos Variable holding a pointer to the current dvb_content_identifier_entry.
*/
#define dvb_content_identifier_descriptor_entries_for_each(d, pos) \
for ((pos) = dvb_content_identifier_descriptor_entries_first(d); \
(pos); \
(pos) = dvb_content_identifier_descriptor_entries_next(d, pos))
/**
* Accessor for the data0 field of a dvb_content_identifier_entry.
*
* @param d dvb_content_identifier_entry pointer.
* @return Pointer, or NULL on error.
*/
static inline struct dvb_content_identifier_entry_data_0*
dvb_content_identifier_entry_data_0(struct dvb_content_identifier_entry *d)
{
if (d->crid_location != 0)
return NULL;
return (struct dvb_content_identifier_entry_data_0*)
((uint8_t*) d + sizeof(struct dvb_content_identifier_entry));
}
/**
* Accessor for the data field of a dvb_content_identifier_entry_data_0.
*
* @param d dvb_content_identifier_entry_data_0 pointer.
* @return Pointer, or NULL on error.
*/
static inline uint8_t*
dvb_content_identifier_entry_data_0_data(struct dvb_content_identifier_entry_data_0 *d)
{
return ((uint8_t*) d + sizeof(struct dvb_content_identifier_entry_data_0));
}
/**
* Accessor for the data1 field of a dvb_content_identifier_entry.
*
* @param d dvb_content_identifier_entry pointer.
* @return Pointer, or NULL on error.
*/
static inline struct dvb_content_identifier_entry_data_1*
dvb_content_identifier_entry_data_1(struct dvb_content_identifier_entry *d)
{
if (d->crid_location != 1)
return NULL;
return (struct dvb_content_identifier_entry_data_1*)
((uint8_t*) d + sizeof(struct dvb_content_identifier_entry));
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_content_identifier_entry*
dvb_content_identifier_descriptor_entries_first(struct dvb_content_identifier_descriptor *d)
{
if (d->d.len == 0)
return NULL;
return (struct dvb_content_identifier_entry *)
((uint8_t*) d + sizeof(struct dvb_content_identifier_descriptor));
}
static inline struct dvb_content_identifier_entry*
dvb_content_identifier_descriptor_entries_next(struct dvb_content_identifier_descriptor *d,
struct dvb_content_identifier_entry *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_content_identifier_entry);
if (next >= end)
return NULL;
switch(pos->crid_location) {
case 0:
if ((next+2) >= end)
return NULL;
if ((next+2+next[1]) >= end)
return NULL;
break;
case 1:
if ((next+3) >= end)
return NULL;
break;
}
return (struct dvb_content_identifier_entry*) next;
}
#ifdef __cplusplus
}
#endif
#endif
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