fmrecover.cpp

/*  FM-Index - Text Index
 *  Copyright (C) 2011  Matthias Petri
 *
 *  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 3 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, see <http://www.gnu.org/licenses/>. */

#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "FM.h"

static void
print_usage(const char *program)
{
    fprintf(stderr, "USAGE: %s -i <index> <qrys>\n", program);
	fprintf(stderr, "  qrys : file containing queries\n");
	fprintf(stderr, "  index : index file\n");
	fprintf(stderr, "  -v verbose output\n");
    fprintf(stderr, "\n");
    fprintf(stderr, "EXAMPLE: %s -i alice29.fm alice29.qrys\n",program);
    fprintf(stderr, "\n");
    return;
}

/*
 * 
 */
int main(int argc, char** argv) {
    int32_t opt;
    char* idxname;
    FM* FMIdx;
	uint32_t start,stop,n;
	uint8_t* result;
    
    /* parse command line parameter */
    if (argc <= 2) {
        print_usage(argv[0]);
        exit(EXIT_FAILURE);
    }
    
	opt = -1;
    idxname = NULL;
    while ((opt = getopt(argc, argv, "vhi:")) != -1) {
        switch (opt) {
			case 'i':
				idxname = optarg;
				break;
			case 'v':
				FM::verbose = 1;
				break;
            case 'h':
            default:
                print_usage(argv[0]);
                exit(EXIT_FAILURE);
        }
    }
		
	/* load index */
	FMIdx = FM::load(idxname);
	if(!FMIdx) {
		perror("error loading index from file");
		exit(EXIT_FAILURE);
	}
	
	start = gettime();
	result = FMIdx->reconstructText(&n);
	fwrite(result,1,n,stdout);
	stop = gettime();
	FM::info("time: %.3f sec",((float)(stop-start))/1000000);
	
	/* clean up */
	free(result);
	delete FMIdx;
	/* T already deleted in FMIdx */
    
    return (EXIT_SUCCESS);
}