p1-parser.h

/*
   File: p1-parser.h

   	  Prototypes and structs to help parse Dutch Smart Meter P1-telegrams.
   	  
   	  (c)2017, Levien van Zon (levien at zonnetjes.net, https://github.com/lvzon)
*/

#define _GNU_SOURCE 1

#include <inttypes.h>

// Data structure to hold meter data

#include "dsmr-data.h"

// Default meter timezone is CET (The Netherlands and most of mainland Western Europe)

#define METER_TIMEZONE	"CET-1CEST,M3.5.0/2,M10.5.0/3"

// Parser buffer used to store strings

#define PARSER_BUFLEN 4096

// Parser stack length (maximum number of string/int capture-elements per line)

#define PARSER_MAXARGS 12

// Data structure used by the Ragel parser

struct parser
{
	int cs;						// Variables needed by Ragel parsers/scanners
	const char *pe;
	char *ts;
	char *te;
	int act;
		
	char buffer[PARSER_BUFLEN+1];		// String capture buffers
	int buflen;
	
	int argc;							// Integer capture stack
	long long arg[PARSER_MAXARGS];
	int multiplier;
	int bitcount;
	int decimalpos;

	int strargc;						// String capture stack
	char *strarg[PARSER_MAXARGS];
	
	// Variables specific to the P1-parser
	
	uint16_t	crc16;
	char		*meter_timezone;
	int			parse_errors, pfaileventcount;

	unsigned int devcount, timeseries_period_minutes;
	uint32_t timeseries_time;
	
	// Data structure to hold meter data
	
	struct dsmr_data_struct	data;
};


// Lookup table for long long integer powers of ten

# define MAX_DIVIDER_EXP 18

static const long long pow10[MAX_DIVIDER_EXP + 1] = {
        1, 10, 100, 1000, 10000, 100000L, 1000000L, 10000000L, 100000000L, 1000000000L,
        10000000000LL, 100000000000LL, 1000000000000LL, 10000000000000LL, 100000000000000LL, 
        1000000000000000LL, 10000000000000000LL, 100000000000000000LL, 1000000000000000000LL};


// Function prototypes

void parser_init( struct parser *fsm );
void parser_execute(struct parser *fsm, const char *data, int len, int eofflag);
int parser_finish(struct parser *fsm);