/* * list.c *//* * Copyright (C) 2005, Simon Kilvington * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA */#include <stdio.h>#include <limits.h>#include "table.h"#include "utils.h"/* PID and TID we want */#define PID_SDT		0x0011#define TID_SDS		0x42/* service_descriptor tag */#define TAG_SERVICE_DESCRIPTOR	0x48voidlist_channels(unsigned int adapter, unsigned int timeout){	char demux_dev[PATH_MAX];	unsigned char *sds;	uint16_t size;	uint16_t offset;	uint16_t service_id;	uint16_t desc_loop_length;	uint8_t desc_tag;	uint8_t desc_length;	uint8_t name_len;	snprintf(demux_dev, sizeof(demux_dev), DEMUX_DEVICE, adapter);	printf("Channels on this mutiplex:\n\n");	printf("ID\tChannel\n");	printf("==\t=======\n");	/* grab the Service Description Section table */	if((sds = read_table(demux_dev, PID_SDT, TID_SDS, timeout)) == NULL)		fatal("Unable to read SDT");	/* 12 bit section_length field */	size = 3 + (((sds[1] & 0x0f) << 8) + sds[2]);	/* loop through the services */	offset = 11;	/* -4 for the CRC at the end */	while(offset < (size - 4))	{		service_id = (sds[offset] << 8) + sds[offset+1];		printf("%u\t", service_id);		/* move on to the descriptors */		offset += 3;		desc_loop_length = ((sds[offset] & 0x0f) << 8) + sds[offset+1];		offset += 2;		/* find the service_descriptor tag */		while(desc_loop_length != 0)		{			desc_tag = sds[offset];			desc_length = sds[offset+1];			offset += 2;			desc_loop_length -= 2;			if(desc_tag == TAG_SERVICE_DESCRIPTOR)			{				/* service_type = sds[offset]; */				offset += 1;				/* service_provider_name */				name_len = sds[offset];				offset += 1 + name_len;				/* service_name */				name_len = sds[offset];				offset += 1;				printf("%.*s\n", name_len, &sds[offset]);				offset += name_len;			}			else			{				vverbose("desc_tag: %u", desc_tag);				vhexdump(&sds[offset], desc_length);				offset += desc_length;			}			desc_loop_length -= desc_length;		}	}	return;}