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202 lines
5.2 KiB
202 lines
5.2 KiB
/*
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* section and descriptor parser
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*
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* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
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* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef _UCSI_DVB_CELL_LIST_DESCRIPTOR
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#define _UCSI_DVB_CELL_LIST_DESCRIPTOR 1
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <libucsi/descriptor.h>
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#include <libucsi/endianops.h>
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/**
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* dvb_cell_list_descriptor structure.
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*/
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struct dvb_cell_list_descriptor {
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struct descriptor d;
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/* struct dvb_cell_list_entry cells[] */
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} __ucsi_packed;
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/**
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* An entry in the cells field of a dvb_cell_list_descriptor.
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*/
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struct dvb_cell_list_entry {
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uint16_t cell_id;
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uint16_t cell_latitude;
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uint16_t cell_longitude;
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EBIT3(uint32_t cell_extend_of_latitude :12; ,
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uint32_t cell_extend_of_longitude :12; ,
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uint32_t subcell_info_loop_length : 8; );
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/* struct dvb_subcell_list_entry subcells[] */
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} __ucsi_packed;
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/**
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* An entry in the subcells field of a dvb_cell_list_entry.
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*/
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struct dvb_subcell_list_entry {
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uint8_t cell_id_extension;
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uint16_t subcell_latitude;
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uint16_t subcell_longitude;
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EBIT2(uint32_t subcell_extend_of_latitude :12; ,
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uint32_t subcell_extend_of_longitude :12; );
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} __ucsi_packed;
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/**
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* Process a dvb_cell_list_descriptor.
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*
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* @param d Generic descriptor pointer.
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* @return dvb_cell_list_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_cell_list_descriptor*
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dvb_cell_list_descriptor_codec(struct descriptor* d)
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{
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uint32_t pos = 0;
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uint32_t pos2 = 0;
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uint8_t* buf = (uint8_t*) d + 2;
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uint32_t len = d->len;
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while(pos < len) {
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struct dvb_cell_list_entry *e =
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(struct dvb_cell_list_entry*) (buf+pos);
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if ((pos + sizeof(struct dvb_cell_list_entry)) > len)
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return NULL;
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bswap16(buf+pos);
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bswap16(buf+pos+2);
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bswap16(buf+pos+4);
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bswap32(buf+pos+6);
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pos += sizeof(struct dvb_cell_list_entry);
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if ((pos + e->subcell_info_loop_length) > len)
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return NULL;
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if (e->subcell_info_loop_length % sizeof(struct dvb_subcell_list_entry))
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return NULL;
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pos2 = 0;
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while(pos2 < e->subcell_info_loop_length) {
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bswap16(buf+pos+pos2+1);
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bswap16(buf+pos+pos2+3);
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bswap24(buf+pos+pos2+5);
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pos2 += sizeof(struct dvb_subcell_list_entry);
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}
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pos += e->subcell_info_loop_length;
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}
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return (struct dvb_cell_list_descriptor*) d;
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}
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/**
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* Iterator for the cells field of a dvb_cell_list_descriptor.
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*
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* @param d dvb_cell_list_descriptor pointer.
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* @param pos Variable holding a pointer to the current dvb_cell_list_entry.
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*/
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#define dvb_cell_list_descriptor_cells_for_each(d, pos) \
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for ((pos) = dvb_cell_list_descriptor_cells_first(d); \
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(pos); \
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(pos) = dvb_cell_list_descriptor_cells_next(d, pos))
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/**
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* Iterator for the subcells field of a dvb_cell_list_entry.
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*
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* @param cell dvb_cell_list_entry pointer.
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* @param pos Variable holding a pointer to the current dvb_subcell_list_entry.
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*/
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#define dvb_cell_list_entry_subcells_for_each(cell, pos) \
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for ((pos) = dvb_cell_list_entry_subcells_first(cell); \
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(pos); \
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(pos) = dvb_cell_list_entry_subcells_next(cell, pos))
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_cell_list_entry*
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dvb_cell_list_descriptor_cells_first(struct dvb_cell_list_descriptor *d)
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{
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if (d->d.len == 0)
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return NULL;
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return (struct dvb_cell_list_entry *)
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((uint8_t*) d + sizeof(struct dvb_cell_list_descriptor));
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}
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static inline struct dvb_cell_list_entry*
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dvb_cell_list_descriptor_cells_next(struct dvb_cell_list_descriptor *d,
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struct dvb_cell_list_entry *pos)
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{
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uint8_t *end = (uint8_t*) d + 2 + d->d.len;
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uint8_t *next = (uint8_t *) pos +
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sizeof(struct dvb_cell_list_entry) +
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pos->subcell_info_loop_length;
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if (next >= end)
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return NULL;
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return (struct dvb_cell_list_entry *) next;
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}
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static inline struct dvb_subcell_list_entry*
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dvb_cell_list_entry_subcells_first(struct dvb_cell_list_entry *d)
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{
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if (d->subcell_info_loop_length == 0)
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return NULL;
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return (struct dvb_subcell_list_entry*)
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((uint8_t*) d + sizeof(struct dvb_cell_list_entry));
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}
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static inline struct dvb_subcell_list_entry*
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dvb_cell_list_entry_subcells_next(struct dvb_cell_list_entry *d,
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struct dvb_subcell_list_entry *pos)
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{
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uint8_t *next = (uint8_t*) pos + sizeof(struct dvb_subcell_list_entry);
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uint8_t *end = (uint8_t*) d +
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sizeof(struct dvb_cell_list_entry) +
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d->subcell_info_loop_length;
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if (next >= end)
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return NULL;
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return (struct dvb_subcell_list_entry *) next;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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