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/*
* 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_LINKAGE_DESCRIPTOR
#define _UCSI_DVB_LINKAGE_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* Possible values for linkage_type.
*/
enum {
DVB_LINKAGE_TYPE_INFORMATION = 0x01,
DVB_LINKAGE_TYPE_EPG = 0x02,
DVB_LINKAGE_TYPE_CA_REPLACEMENT = 0x03,
DVB_LINKAGE_TYPE_TS_WITH_BAT_NIT = 0x04,
DVB_LINKAGE_TYPE_SERVICE_REPLACMENT = 0x05,
DVB_LINKAGE_TYPE_DATA_BCAST = 0x06,
DVB_LINKAGE_TYPE_RCS_MAP = 0x07,
DVB_LINKAGE_TYPE_MOBILE_HANDOVER = 0x08,
DVB_LINKAGE_TYPE_SOFTWARE_UPDATE = 0x09,
DVB_LINKAGE_TYPE_TS_WITH_SSU_BAT_NIT = 0x0a,
DVB_LINKAGE_TYPE_IP_MAC_NOTIFICATION = 0x0b,
DVB_LINKAGE_TYPE_TS_WITH_INT_BAT_NIT = 0x0c,
};
/**
* Possible values for hand_over_type.
*/
enum {
DVB_HAND_OVER_TYPE_IDENTICAL_NEIGHBOURING_COUNTRY = 0x01,
DVB_HAND_OVER_TYPE_LOCAL_VARIATION = 0x02,
DVB_HAND_OVER_TYPE_ASSOCIATED_SERVICE = 0x03,
};
/**
* Possible values for origin_type.
*/
enum {
DVB_ORIGIN_TYPE_NIT = 0x00,
DVB_ORIGIN_TYPE_SDT = 0x01,
};
/**
* dvb_linkage_descriptor structure.
*/
struct dvb_linkage_descriptor {
struct descriptor d;
uint16_t transport_stream_id;
uint16_t original_network_id;
uint16_t service_id;
uint8_t linkage_type;
/* uint8_t data[] */
} __ucsi_packed;
/**
* Data for a linkage_type of 0x08.
*/
struct dvb_linkage_data_08 {
EBIT3(uint8_t hand_over_type : 4; ,
uint8_t reserved : 3; ,
uint8_t origin_type : 1; );
/* uint16_t network_id if hand_over_type == 1,2,3 */
/* uint16_t initial_service_id if origin_type = 0 */
/* uint8_t data[] */
} __ucsi_packed;
/**
* Data for an linkage_type of 0x0b (IP/MAC Notification Table).
*/
struct dvb_linkage_data_0b {
uint8_t platform_id_data_length;
/* struct platform_id ids[] */
} __ucsi_packed;
/**
* Entries in the ids field of a dvb_linkage_data_0b.
*/
struct dvb_platform_id {
EBIT2(uint32_t platform_id : 24; ,
uint8_t platform_name_loop_length : 8; );
/* struct platform_name names[] */
} __ucsi_packed;
/**
* Entries in the names field of a dvb_platform_id.
*/
struct dvb_platform_name {
iso639lang_t language_code;
uint8_t platform_name_length;
/* uint8_t text[] */
} __ucsi_packed;
/**
* Data for a linkage_type of 0x0c (IP/MAC Notification Table).
*/
struct dvb_linkage_data_0c {
uint8_t table_type;
/* uint16_t bouquet_id if table_type == 0x02 */
} __ucsi_packed;
/**
* Process a dvb_linkage_descriptor.
*
* @param d Generic descriptor pointer.
* @return dvb_linkage_descriptor pointer, or NULL on error.
*/
static inline struct dvb_linkage_descriptor*
dvb_linkage_descriptor_codec(struct descriptor* d)
{
uint32_t pos = 0;
uint8_t* buf = (uint8_t*) d + 2;
uint32_t len = d->len;
struct dvb_linkage_descriptor *p =
(struct dvb_linkage_descriptor*) d;
if (len < (sizeof(struct dvb_linkage_descriptor) - 2))
return NULL;
bswap16(buf);
bswap16(buf+2);
bswap16(buf+4);
pos += sizeof(struct dvb_linkage_descriptor) - 2;
if (p->linkage_type == 0x08) {
struct dvb_linkage_data_08 *d08;
if ((len - pos) < sizeof(struct dvb_linkage_data_08))
return NULL;
d08 = (struct dvb_linkage_data_08 *) (buf+pos);
pos += sizeof(struct dvb_linkage_data_08);
switch(d08->hand_over_type) {
case 1:
case 2:
case 3:
if ((len - pos) < 2)
return NULL;
bswap16(buf+pos);
pos += 2;
break;
}
if (d08->origin_type == 0) {
if ((len - pos) < 2)
return NULL;
bswap16(buf+pos);
pos+=2;
}
} else if (p->linkage_type == 0x0b) {
uint32_t pos2=0;
struct dvb_linkage_data_0b *l_0b = (struct dvb_linkage_data_0b *) (buf + pos);
if ((len - pos) < sizeof(struct dvb_linkage_data_0b))
return NULL;
pos += sizeof(struct dvb_linkage_data_0b);
if ((len - pos) < l_0b->platform_id_data_length)
return NULL;
while (pos2 < l_0b->platform_id_data_length) {
bswap32(buf + pos + pos2);
struct dvb_platform_id *p_id = (struct dvb_platform_id *) (buf + pos + pos2);
if ((len - pos - pos2) < p_id->platform_name_loop_length)
return NULL;
pos2 += sizeof(struct dvb_platform_id) + p_id->platform_name_loop_length;
}
pos += pos2;
} else if (p->linkage_type == 0x0c) {
struct dvb_linkage_data_0c *l_0c = (struct dvb_linkage_data_0c *) (buf + pos);
if ((len - pos) < sizeof(struct dvb_linkage_data_0c))
return NULL;
pos += sizeof(struct dvb_linkage_data_0c);
if (l_0c->table_type == 0x02) {
if ((len - pos) < 2)
return NULL;
bswap16(buf+pos);
}
}
return (struct dvb_linkage_descriptor*) d;
}
/**
* Accessor for the data field of a dvb_linkage_descriptor.
*
* @param d dvb_linkage_descriptor pointer.
* @return Pointer to the data field.
*/
static inline uint8_t *
dvb_linkage_descriptor_data(struct dvb_linkage_descriptor *d)
{
return (uint8_t *) d + sizeof(struct dvb_linkage_descriptor);
}
/**
* Determine the length of the data field of a dvb_linkage_descriptor.
*
* @param d dvb_linkage_descriptor pointer.
* @return Length of the field in bytes.
*/
static inline int
dvb_linkage_descriptor_data_length(struct dvb_linkage_descriptor *d)
{
return d->d.len - 7;
}
/**
* Accessor for a dvb_linkage_data_08 pointer.
*
* @param d dvb_linkage_descriptor pointer.
* @return Pointer to the data field.
*/
static inline struct dvb_linkage_data_08 *
dvb_linkage_data_08(struct dvb_linkage_descriptor *d)
{
if (d->linkage_type != 0x08)
return NULL;
return (struct dvb_linkage_data_08 *) dvb_linkage_descriptor_data(d);
}
/**
* Accessor for the network_id field of a dvb_linkage_data_08.
*
* @param d dvb_linkage_descriptor pointer
* @param d08 dvb_linkage_data_08 pointer.
* @return network_id, or -1 if not present
*/
static inline int
dvb_linkage_data_08_network_id(struct dvb_linkage_descriptor *d, struct dvb_linkage_data_08 *d08)
{
if (d->linkage_type != 0x08)
return -1;
switch(d08->hand_over_type) {
case 1:
case 2:
case 3:
return *((uint16_t*) ((uint8_t*) d08 + sizeof(struct dvb_linkage_data_08)));
}
return -1;
}
/**
* Accessor for the initial_service_id field of a dvb_linkage_data_08.
*
* @param d dvb_linkage_descriptor pointer
* @param d08 dvb_linkage_data_08 pointer.
* @return initial_service_id, or -1 if not present
*/
static inline int
dvb_linkage_data_08_initial_service_id(struct dvb_linkage_descriptor *d, struct dvb_linkage_data_08 *d08)
{
uint8_t *pos;
if (d->linkage_type != 0x08)
return -1;
if (d08->origin_type != 0)
return -1;
pos = ((uint8_t*) d08) + sizeof(struct dvb_linkage_data_08);
switch(d08->hand_over_type) {
case 1:
case 2:
case 3:
pos +=2;
break;
}
return *((uint16_t*) pos);
}
/**
* Accessor for the data field of a dvb_linkage_data_08.
*
* @param d dvb_linkage_descriptor pointer
* @param d08 dvb_linkage_data_08 pointer.
* @param length Pointer to int destination for data length.
* @return Pointer to the data field, or NULL if invalid
*/
static inline uint8_t *
dvb_linkage_data_08_data(struct dvb_linkage_descriptor *d, struct dvb_linkage_data_08 *d08, int *length)
{
uint8_t *pos;
int used = 0;
if (d->linkage_type != 0x08) {
*length = 0;
return NULL;
}
pos = ((uint8_t*) d08) + sizeof(struct dvb_linkage_data_08);
switch(d08->hand_over_type) {
case 1:
case 2:
case 3:
pos += 2;
used += 2;
break;
}
if (d08->origin_type == 0) {
pos+=2;
used+=2;
}
*length = dvb_linkage_descriptor_data_length(d) - (sizeof(struct dvb_linkage_data_08) + used);
return pos;
}
/**
* Accessor for a dvb_linkage_data_0b pointer.
*
* @param d dvb_linkage_descriptor pointer.
* @return Pointer to the data field.
*/
static inline struct dvb_linkage_data_0b *
dvb_linkage_data_0b(struct dvb_linkage_descriptor *d)
{
if (d->linkage_type != 0x0b)
return NULL;
return (struct dvb_linkage_data_0b *) dvb_linkage_descriptor_data(d);
}
/**
* Iterator for the platform_id field of a dvb_linkage_data_0b.
*
* @param linkage dvb_linkage_data_0b pointer.
* @param pos Variable containing a pointer to the current dvb_platform_id.
*/
#define dvb_linkage_data_0b_platform_id_for_each(linkage, pos) \
for ((pos) = dvb_platform_id_first(linkage); \
(pos); \
(pos) = dvb_platform_id_next(linkage, pos))
/**
* Iterator for the platform_name field of a dvb_platform_id.
*
* @param platid dvb_platform_id pointer.
* @param pos Variable containing a pointer to the current dvb_platform_name.
*/
#define dvb_platform_id_platform_name_for_each(platid, pos) \
for ((pos) = dvb_platform_name_first(platid); \
(pos); \
(pos) = dvb_platform_name_next(platid, pos))
/**
* Accessor for the text field of a dvb_platform_name.
*
* @param p dvb_platform_name pointer.
* @return Pointer to the field.
*/
static inline uint8_t *
dvb_platform_name_text(struct dvb_platform_name *p)
{
return (uint8_t *) p + sizeof(struct dvb_platform_name);
}
/**
* Accessor for a dvb_linkage_data_0c pointer.
*
* @param d dvb_linkage_descriptor pointer.
* @return Pointer to the data field.
*/
static inline struct dvb_linkage_data_0c *
dvb_linkage_data_0c(struct dvb_linkage_descriptor *d)
{
if (d->linkage_type != 0x0c)
return NULL;
return (struct dvb_linkage_data_0c *) dvb_linkage_descriptor_data(d);
}
/**
* Accessor for the bouquet_id field of a dvb_linkage_data_0c if table_id == 0x02.
*
* @param l_0c dvb_linkage_data_0c pointer.
* @return The bouquet field, or -1 on error.
*/
static inline int
dvb_linkage_data_0c_bouquet_id(struct dvb_linkage_data_0c *l_0c)
{
if (l_0c->table_type != 0x02)
return -1;
return *((uint16_t *) ((uint8_t*) l_0c + 1));
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_platform_id *
dvb_platform_id_first(struct dvb_linkage_data_0b *d)
{
if (d->platform_id_data_length == 0)
return NULL;
return (struct dvb_platform_id *) ((uint8_t *) d + sizeof(struct dvb_linkage_data_0b));
}
static inline struct dvb_platform_id *
dvb_platform_id_next(struct dvb_linkage_data_0b *d,
struct dvb_platform_id *pos)
{
uint8_t *end = (uint8_t *) d + d->platform_id_data_length;
uint8_t *next = (uint8_t *) pos +
sizeof(struct dvb_platform_id) +
pos->platform_name_loop_length;
if (next >= end)
return NULL;
return (struct dvb_platform_id *) next;
}
static inline struct dvb_platform_name *
dvb_platform_name_first(struct dvb_platform_id *p)
{
if (p->platform_name_loop_length == 0)
return NULL;
return (struct dvb_platform_name *) ((uint8_t *) p + sizeof(struct dvb_platform_id));
}
static inline struct dvb_platform_name *
dvb_platform_name_next(struct dvb_platform_id *p,
struct dvb_platform_name *pos)
{
uint8_t *end = (uint8_t *) p + p->platform_name_loop_length;
uint8_t *next = (uint8_t *) pos +
sizeof(struct dvb_platform_name) +
pos->platform_name_length;
if (next >= end)
return NULL;
return (struct dvb_platform_name *) next;
}
#ifdef __cplusplus
}
#endif
#endif
|