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read_bin.c
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Sun, Dec 1, 15:29

read_bin.c
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/*this function will read a binary file containing gnfw slope (alpha),
x (r/rsc), kappa and dpl. These values will have to be rescaled
before being used by lenstool. The function will return the number
of complete entries made*/
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#define ARRAY_SIZE 3000000
typedef struct{
double alpha_now,x_now,kappa,dpl;
} lensdata;
//extern lensdata *lens_table;
int read_bin(int tot_count)
{
int i=0;
char outfile[20];
double alphasteps, xsteps;
int int_alphasteps, int_xsteps;
lensdata *lens_table; // comment here if extern lens_table uncommented
lensdata array_tmp[2];
FILE *outf;
strcpy(outfile,"lenstool.tab");
outf = fopen(outfile,"rb+");
//read in the first two lines to find out how many more lines to read*/
fread(&array_tmp[0], sizeof(lensdata),1,outf);
alphasteps = array_tmp[0].x_now+0.01;
int_alphasteps = alphasteps;
fread(&array_tmp[1], sizeof(lensdata),1,outf);
xsteps = array_tmp[1].x_now+0.01;
int_xsteps = xsteps;
tot_count = int_xsteps*int_alphasteps + 2;
// Allocate lens_table
lens_table = (lensdata*) malloc( (unsigned int) tot_count*sizeof(lensdata) );
// Fill the first 2 rows of lens_table with array_tmp
memcpy( &lens_table[0], &array_tmp[0], sizeof(lensdata) );
memcpy( &lens_table[1], &array_tmp[1], sizeof(lensdata) );
if(tot_count > ARRAY_SIZE)
{
printf("Need to increase output array size!!!\n");
return -1;
}
for (i=2; i<tot_count; i++)
{
fread(&lens_table[i], sizeof(lensdata),1,outf);
/*printf("lens_out[%i].alpha=%f\n",i,lens_out[i].alpha_now);*/
}
printf("Finished reading binary file into array.\n");
fclose(outf);
return tot_count;
}

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