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80 lines
2.4 KiB
80 lines
2.4 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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* Copyright (C) 2005 Patrick Boettcher (pb@linuxtv.org)
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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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#include <libucsi/dvb/int_section.h>
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struct dvb_int_section * dvb_int_section_codec(struct section_ext *ext)
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{
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uint8_t *buf = (uint8_t *) ext;
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struct dvb_int_section *in = (struct dvb_int_section *) ext;
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size_t pos = sizeof(struct section_ext);
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size_t len = section_ext_length(ext);
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if (len < sizeof(struct dvb_int_section))
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return NULL;
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bswap32(buf+8);
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bswap16(buf+12);
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pos += 6;
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if (len - pos < in->platform_descriptors_length)
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return NULL;
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if (verify_descriptors(buf + pos, in->platform_descriptors_length))
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return NULL;
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pos += in->platform_descriptors_length;
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while (pos < len) {
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struct dvb_int_target *s2 = (struct dvb_int_target *) (buf + pos);
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struct dvb_int_operational_loop *s3;
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bswap16(buf + pos); /* target_descriptor_loop_length swap */
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if (len - pos < s2->target_descriptors_length)
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return NULL;
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pos += sizeof(struct dvb_int_target);
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if (verify_descriptors(buf + pos, s2->target_descriptors_length))
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return NULL;
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pos += s2->target_descriptors_length;
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s3 = (struct dvb_int_operational_loop *) (buf + pos);
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bswap16(buf + pos); /* operational_descriptor_loop_length swap */
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if (len - pos < s3->operational_descriptors_length)
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return NULL;
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pos += sizeof(struct dvb_int_operational_loop);
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if (verify_descriptors(buf + pos, s3->operational_descriptors_length))
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return NULL;
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pos += s3->operational_descriptors_length;
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}
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return (struct dvb_int_section *) ext;
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}
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