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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_CELL_LIST_DESCRIPTOR
#define _UCSI_DVB_CELL_LIST_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
/**
* dvb_cell_list_descriptor structure.
*/
struct dvb_cell_list_descriptor {
struct descriptor d;
/* struct dvb_cell_list_entry cells[] */
} __ucsi_packed;
/**
* An entry in the cells field of a dvb_cell_list_descriptor.
*/
struct dvb_cell_list_entry {
uint16_t cell_id;
uint16_t cell_latitude;
uint16_t cell_longitude;
EBIT3(uint32_t cell_extend_of_latitude :12; ,
uint32_t cell_extend_of_longitude :12; ,
uint32_t subcell_info_loop_length : 8; );
/* struct dvb_subcell_list_entry subcells[] */
} __ucsi_packed;
/**
* An entry in the subcells field of a dvb_cell_list_entry.
*/
struct dvb_subcell_list_entry {
uint8_t cell_id_extension;
uint16_t subcell_latitude;
uint16_t subcell_longitude;
EBIT2(uint32_t subcell_extend_of_latitude :12; ,
uint32_t subcell_extend_of_longitude :12; );
} __ucsi_packed;
/**
* Process a dvb_cell_list_descriptor.
*
* @param d Generic descriptor pointer.
* @return dvb_cell_list_descriptor pointer, or NULL on error.
*/
static inline struct dvb_cell_list_descriptor*
dvb_cell_list_descriptor_codec(struct descriptor* d)
{
uint32_t pos = 0;
uint32_t pos2 = 0;
uint8_t* buf = (uint8_t*) d + 2;
uint32_t len = d->len;
while(pos < len) {
struct dvb_cell_list_entry *e =
(struct dvb_cell_list_entry*) (buf+pos);
if ((pos + sizeof(struct dvb_cell_list_entry)) > len)
return NULL;
bswap16(buf+pos);
bswap16(buf+pos+2);
bswap16(buf+pos+4);
bswap32(buf+pos+6);
pos += sizeof(struct dvb_cell_list_entry);
if ((pos + e->subcell_info_loop_length) > len)
return NULL;
if (e->subcell_info_loop_length % sizeof(struct dvb_subcell_list_entry))
return NULL;
pos2 = 0;
while(pos2 < e->subcell_info_loop_length) {
bswap16(buf+pos+pos2+1);
bswap16(buf+pos+pos2+3);
bswap24(buf+pos+pos2+5);
pos2 += sizeof(struct dvb_subcell_list_entry);
}
pos += e->subcell_info_loop_length;
}
return (struct dvb_cell_list_descriptor*) d;
}
/**
* Iterator for the cells field of a dvb_cell_list_descriptor.
*
* @param d dvb_cell_list_descriptor pointer.
* @param pos Variable holding a pointer to the current dvb_cell_list_entry.
*/
#define dvb_cell_list_descriptor_cells_for_each(d, pos) \
for ((pos) = dvb_cell_list_descriptor_cells_first(d); \
(pos); \
(pos) = dvb_cell_list_descriptor_cells_next(d, pos))
/**
* Iterator for the subcells field of a dvb_cell_list_entry.
*
* @param cell dvb_cell_list_entry pointer.
* @param pos Variable holding a pointer to the current dvb_subcell_list_entry.
*/
#define dvb_cell_list_entry_subcells_for_each(cell, pos) \
for ((pos) = dvb_cell_list_entry_subcells_first(cell); \
(pos); \
(pos) = dvb_cell_list_entry_subcells_next(cell, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_cell_list_entry*
dvb_cell_list_descriptor_cells_first(struct dvb_cell_list_descriptor *d)
{
if (d->d.len == 0)
return NULL;
return (struct dvb_cell_list_entry *)
((uint8_t*) d + sizeof(struct dvb_cell_list_descriptor));
}
static inline struct dvb_cell_list_entry*
dvb_cell_list_descriptor_cells_next(struct dvb_cell_list_descriptor *d,
struct dvb_cell_list_entry *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t *next = (uint8_t *) pos +
sizeof(struct dvb_cell_list_entry) +
pos->subcell_info_loop_length;
if (next >= end)
return NULL;
return (struct dvb_cell_list_entry *) next;
}
static inline struct dvb_subcell_list_entry*
dvb_cell_list_entry_subcells_first(struct dvb_cell_list_entry *d)
{
if (d->subcell_info_loop_length == 0)
return NULL;
return (struct dvb_subcell_list_entry*)
((uint8_t*) d + sizeof(struct dvb_cell_list_entry));
}
static inline struct dvb_subcell_list_entry*
dvb_cell_list_entry_subcells_next(struct dvb_cell_list_entry *d,
struct dvb_subcell_list_entry *pos)
{
uint8_t *next = (uint8_t*) pos + sizeof(struct dvb_subcell_list_entry);
uint8_t *end = (uint8_t*) d +
sizeof(struct dvb_cell_list_entry) +
d->subcell_info_loop_length;
if (next >= end)
return NULL;
return (struct dvb_subcell_list_entry *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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