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/*
* section and descriptor parser
*
* 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_SECTION_BUF_H
#define _UCSI_SECTION_BUF_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <stdint.h>
#define DVB_MAX_SECTION_BYTES 4096
/**
* Buffer used to keep track of section fragments. You should allocate an
* area of memory of size (sizeof(section_buf) + <maxsectionsize>), and pass that area
* to section_buf_init() to set it up.
*/
struct section_buf {
uint32_t max; /* maximum size of section - setup by section_buf_init() */
uint32_t count; /* number of bytes currently accumulated */
uint32_t len; /* total number of bytes expected in the complete section */
uint8_t header:1; /* flag indicating the section header has been commpletely received */
uint8_t wait_pdu:1;/* flag indicating to wait till the next PDU start */
/* uint8_t data[] */
};
/**
* Initialise a section_buf structure.
*
* @param section The section_buf to initialise.
* @param max Maximum number of bytes in section (must be > 3)
* @return 0 on success, nonzero on error.
*/
extern int section_buf_init(struct section_buf *section, int max);
/**
* Reset a section_buf structure (e.g. if a discontinuity occurred). The
* section_buf will wait for the first PDU start indicator.
*
* @param section The section_buf to reset.
*/
static inline void section_buf_reset(struct section_buf *section)
{
int tmp = section->wait_pdu;
section_buf_init(section, section->max);
section->wait_pdu = tmp;
}
/**
* Add a data fragment to a section_buf.
*
* @param section section_buf to add to.
* @param frag Pointer to data fragment.
* @param len Number of bytes of data.
* @param section_status 0: nothing special. 1: section complete. -ERANGE indicates that the
* section is larger than section->max.
* @return Number of bytes which were consumed.
*/
extern int section_buf_add(struct section_buf *section, uint8_t* frag, int len, int *section_status);
/**
* Add a transport packet PSI payload to a section_buf. This takes into account
* the extra byte present in PDU_START flagged packets.
*
* @param section section_buf to add to.
* @param payload Pointer to packet payload data.
* @param len Number of bytes of data.
* @param pdu_start True if the payload_unit_start_indicator flag was set in the
* TS packet.
* @param section_status 0: nothing special. 1: section complete. -ERANGE indicates that the
* section is larger than section->max. -EINVAL indicates the pointer_field was completely
* invalid (too large).
*/
extern int section_buf_add_transport_payload(struct section_buf *section,
uint8_t* payload, int len,
int pdu_start, int *section_status);
/**
* Get the number of bytes left to be received in a section_buf.
*
* @param section The section_buf concerned.
* @return The number of bytes.
*/
static inline int section_buf_remaining(struct section_buf *section)
{
return section->len - section->count;
}
/**
* Return a pointer to the start of the data in the section_buf.
*
* @param section The section_buf concerned.
* @return The data.
*/
static inline uint8_t* section_buf_data(struct section_buf *section)
{
return (uint8_t*) section + sizeof(struct section_buf);
}
#ifdef __cplusplus
}
#endif
#endif
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