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234 lines
5.8 KiB
234 lines
5.8 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_CONTENT_IDENTIFIER_DESCRIPTOR
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#define _UCSI_DVB_CONTENT_IDENTIFIER_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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#include <libucsi/types.h>
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/**
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* Possible values for the crid_type.
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*/
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enum {
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DVB_CRID_TYPE_NONE = 0x00,
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DVB_CRID_TYPE_ITEM = 0x01,
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DVB_CRID_TYPE_SERIES = 0x02,
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DVB_CRID_TYPE_RECOMMENDATION = 0x03,
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};
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/**
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* Possible values for the crid_location.
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*/
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enum {
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DVB_CRID_LOCATION_THIS_DESCRIPTOR = 0x00,
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DVB_CRID_LOCATION_CIT = 0x01,
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};
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/**
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* dvb_content_identifier_descriptor structure.
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*/
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struct dvb_content_identifier_descriptor {
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struct descriptor d;
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/* struct dvb_content_identifier_entry entries[] */
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} __ucsi_packed;
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/**
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* An entry in the entries field of a dvb_content_identifier_descriptor.
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*/
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struct dvb_content_identifier_entry {
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EBIT2(uint8_t crid_type : 6; ,
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uint8_t crid_location : 2; );
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/* struct dvb_content_identifier_data_00 data0 */
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/* struct dvb_content_identifier_data_01 data1 */
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} __ucsi_packed;
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/**
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* The data if crid_location == 0
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*/
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struct dvb_content_identifier_entry_data_0 {
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uint8_t crid_length;
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/* uint8_t data[] */
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} __ucsi_packed;
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/**
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* The data if crid_location == 1
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*/
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struct dvb_content_identifier_entry_data_1 {
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uint16_t crid_ref;
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} __ucsi_packed;
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/**
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* Process a dvb_content_identifier_descriptor.
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*
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* @param d Generic descriptor.
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* @return dvb_content_identifier_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_content_identifier_descriptor*
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dvb_content_identifier_descriptor_codec(struct descriptor* d)
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{
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uint32_t len = d->len + 2;
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uint32_t pos = 2;
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uint8_t *buf = (uint8_t*) d;
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while(pos < len) {
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struct dvb_content_identifier_entry *e =
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(struct dvb_content_identifier_entry*) (buf + pos);
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if (len < (pos+1))
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return NULL;
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pos++;
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switch(e->crid_location) {
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case 0:
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if (len < (pos + 1))
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return NULL;
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if (len < (pos + 1 + buf[pos]))
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return NULL;
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pos += 1 + buf[pos];
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break;
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case 1:
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if (len < (pos+2))
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return NULL;
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bswap16(buf+pos);
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break;
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}
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}
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if (pos != len)
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return NULL;
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return (struct dvb_content_identifier_descriptor*) d;
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}
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/**
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* Iterator for entries field of a dvb_content_identifier_descriptor.
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*
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* @param d dvb_content_identifier_descriptor pointer.
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* @param pos Variable holding a pointer to the current dvb_content_identifier_entry.
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*/
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#define dvb_content_identifier_descriptor_entries_for_each(d, pos) \
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for ((pos) = dvb_content_identifier_descriptor_entries_first(d); \
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(pos); \
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(pos) = dvb_content_identifier_descriptor_entries_next(d, pos))
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/**
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* Accessor for the data0 field of a dvb_content_identifier_entry.
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*
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* @param d dvb_content_identifier_entry pointer.
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* @return Pointer, or NULL on error.
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*/
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static inline struct dvb_content_identifier_entry_data_0*
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dvb_content_identifier_entry_data_0(struct dvb_content_identifier_entry *d)
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{
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if (d->crid_location != 0)
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return NULL;
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return (struct dvb_content_identifier_entry_data_0*)
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((uint8_t*) d + sizeof(struct dvb_content_identifier_entry));
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}
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/**
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* Accessor for the data field of a dvb_content_identifier_entry_data_0.
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*
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* @param d dvb_content_identifier_entry_data_0 pointer.
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* @return Pointer, or NULL on error.
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*/
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static inline uint8_t*
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dvb_content_identifier_entry_data_0_data(struct dvb_content_identifier_entry_data_0 *d)
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{
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return ((uint8_t*) d + sizeof(struct dvb_content_identifier_entry_data_0));
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}
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/**
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* Accessor for the data1 field of a dvb_content_identifier_entry.
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*
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* @param d dvb_content_identifier_entry pointer.
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* @return Pointer, or NULL on error.
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*/
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static inline struct dvb_content_identifier_entry_data_1*
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dvb_content_identifier_entry_data_1(struct dvb_content_identifier_entry *d)
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{
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if (d->crid_location != 1)
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return NULL;
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return (struct dvb_content_identifier_entry_data_1*)
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((uint8_t*) d + sizeof(struct dvb_content_identifier_entry));
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}
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_content_identifier_entry*
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dvb_content_identifier_descriptor_entries_first(struct dvb_content_identifier_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_content_identifier_entry *)
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((uint8_t*) d + sizeof(struct dvb_content_identifier_descriptor));
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}
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static inline struct dvb_content_identifier_entry*
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dvb_content_identifier_descriptor_entries_next(struct dvb_content_identifier_descriptor *d,
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struct dvb_content_identifier_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 + sizeof(struct dvb_content_identifier_entry);
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if (next >= end)
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return NULL;
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switch(pos->crid_location) {
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case 0:
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if ((next+2) >= end)
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return NULL;
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if ((next+2+next[1]) >= end)
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return NULL;
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break;
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case 1:
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if ((next+3) >= end)
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return NULL;
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break;
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}
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return (struct dvb_content_identifier_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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