From ab959d7b4194715870128e616b8e29d4a101e488 Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:41 +0200 Subject: Imported Upstream version 1.1.1+rev1207 --- lib/libucsi/dvb/content_identifier_descriptor.h | 233 ++++++++++++++++++++++++ 1 file changed, 233 insertions(+) create mode 100644 lib/libucsi/dvb/content_identifier_descriptor.h (limited to 'lib/libucsi/dvb/content_identifier_descriptor.h') diff --git a/lib/libucsi/dvb/content_identifier_descriptor.h b/lib/libucsi/dvb/content_identifier_descriptor.h new file mode 100644 index 0000000..c2cf9ea --- /dev/null +++ b/lib/libucsi/dvb/content_identifier_descriptor.h @@ -0,0 +1,233 @@ +/* + * 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 +#include +#include + + +/** + * 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 -- cgit v1.2.3