/* * 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_MULTILINGUAL_COMPONENT_DESCRIPTOR #define _UCSI_DVB_MULTILINGUAL_COMPONENT_DESCRIPTOR 1 #ifdef __cplusplus extern "C" { #endif #include <libucsi/descriptor.h> #include <libucsi/endianops.h> #include <libucsi/types.h> /** * dvb_multilingual_component_descriptor structure. */ struct dvb_multilingual_component_descriptor { struct descriptor d; uint8_t component_tag; /* struct dvb_multilingual_component components[] */ } __ucsi_packed; /** * An entry in the components field of a dvb_multilingual_component_descriptor. */ struct dvb_multilingual_component { iso639lang_t language_code; uint8_t text_description_length; /* uint8_t text_char[] */ } __ucsi_packed; /** * Process a dvb_multilingual_component_descriptor. * * @param d Generic descriptor pointer. * @return dvb_multilingual_component_descriptor pointer, or NULL on error. */ static inline struct dvb_multilingual_component_descriptor* dvb_multilingual_component_descriptor_codec(struct descriptor* d) { uint8_t* buf = (uint8_t*) d + 2; uint32_t pos = sizeof(struct dvb_multilingual_component_descriptor) - 2; uint32_t len = d->len; if (pos > len) return NULL; while(pos < len) { struct dvb_multilingual_component *e = (struct dvb_multilingual_component*) (buf+pos); pos += sizeof(struct dvb_multilingual_component); if (pos > len) return NULL; pos += e->text_description_length; if (pos > len) return NULL; } return (struct dvb_multilingual_component_descriptor*) d; } /** * Iterator for entries in the components field of a dvb_multilingual_component_descriptor. * * @param d Generic descriptor pointer. * @param pos Variable containing a pointer to the current dvb_multilingual_component. */ #define dvb_multilingual_component_descriptor_components_for_each(d, pos) \ for ((pos) = dvb_multilingual_component_descriptor_components_first(d); \ (pos); \ (pos) = dvb_multilingual_component_descriptor_components_next(d, pos)) /** * Accessor for the text_char field in a dvb_multilingual_component. * * @param e dvb_multilingual_component pointer. * @return Pointer to the field. */ static inline uint8_t * dvb_multilingual_component_text_char(struct dvb_multilingual_component *e) { return (uint8_t *) e + sizeof(struct dvb_multilingual_component); } /******************************** PRIVATE CODE ********************************/ static inline struct dvb_multilingual_component* dvb_multilingual_component_descriptor_components_first(struct dvb_multilingual_component_descriptor *d) { if (d->d.len == 1) return NULL; return (struct dvb_multilingual_component *) ((uint8_t*) d + sizeof(struct dvb_multilingual_component_descriptor)); } static inline struct dvb_multilingual_component* dvb_multilingual_component_descriptor_components_next(struct dvb_multilingual_component_descriptor *d, struct dvb_multilingual_component *pos) { uint8_t *end = (uint8_t*) d + 2 + d->d.len; uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_multilingual_component) + pos->text_description_length; if (next >= end) return NULL; return (struct dvb_multilingual_component *) next; } #ifdef __cplusplus } #endif #endif