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convm.c
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convm.c
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/*****************************************************************************
** CONVM.C version: 1.2 **
******************************************************************************
** This program converts MULTIPLE JPL-supplied unix binary files into **
** a single binary file readable with C code under Linux and DOS on the **
** Intel 80x86 based machines. It should also be readable with Fortran **
** under both Linux and DOS. Tests for various fortran compilers in progress**
******************************************************************************
** This (1.2) version works with JPL ephemerides: **
** DE200, DE403, DE404, DE405 and DE406. **
******************************************************************************
** This program reads a series of standard unix binary file supplied **
** by JPL ( UNXP1600.405, UNXP1650.405, ... for EXAMPLE ) and creates **
** a single, binary ephemeris file, in which all data from **
** the original files were copied WITH REVERSED ORDER OF BYTES **
** in 4 byte integers and 8 byte double numbers. **
** All other data and the overall structure ( record length, **
** variable order etc.) remains the same. **
** It is also a possibility of creating the converted binary file only **
** for a given time subinterval of the whole ephemeris. **
******************************************************************************
** YOU SHOULD MANUALLY ADJUST THIS SOURCE FILE BEFORE COMPILED AND RUN **
******************************************************************************
** Originally written by: Piotr A. Dybczynski, e-mail:[email protected] **
******************************************************************************
** Created: July 2, 1997 by PAD ** Last modified: July 23, 1997 by PAD. **
*****************************************************************************/
#include<stdio.h>
#include<math.h>
void reverse( unsigned char t[], int n);
/****************************************************************************/
/* UNCOMMENT ONE AND ONLY ONE OF THE FOLLOWING DENUM DEFINITIONS: */
/*#define DENUM 200*/
/*#define DENUM 403*/
/*#define DENUM 404*/
#define DENUM 405
/*#define DENUM 406*/
/****************************************************************************/
#if DENUM==200
#define KSIZE 1652
#elif DENUM==403 || DENUM==405
#define KSIZE 2036
#define DSTART 1600
#define DSTOP 2150
#define DSTEP 50
#define STEP 32.
#elif DENUM==404 || DENUM==406
#define KSIZE 1456
#define DSTART -3000
#define DSTOP 2700
#define DSTEP 300
#define STEP 64.
#endif
#define NRECL 4
#define RECSIZE (NRECL*KSIZE)
#define NCOEFF (KSIZE/2)
/* we use long int instead of int for DOS-Linux compatibility: in either case
there are 4 bytes per integer variable ! */
/* Declarations in comments come from ephemeris reading software.
They are replaced with char arrays for byte order reversing. */
struct rec1{
char ttl[3][84];
char cnam[400][6];
/*double ss[3];*/
unsigned char ss[24];
/*long int ncon;*/
unsigned char ncon[4];
/*double au;*/
unsigned char au[8];
/*double emrat;*/
unsigned char emrat[8];
/*
long int ipt[12][3];
long int numde;
long int lpt[3];
*/
unsigned char other[160];
};
struct{
struct rec1 r1;
char spare[RECSIZE-sizeof(struct rec1)];
} R1;
struct rec2{
/*double cval[400];*/
unsigned char cval[3200];
};
struct{
struct rec2 r2;
char spare[RECSIZE-sizeof(struct rec2)];
} R2;
union {
double ss[3];
unsigned char bb[24];
} B;
FILE *F1,*F2;
void main(void)
{
int i,first,firstblock,fnum;
unsigned char buff[10000];
double t1,t2,te1,tlast,tend;
puts("CONVM: multiple file conversion program for the JPL export ephemerides\n");
/* Decide what interval is desired.... */
printf("Enter Start Epoch (in JED, zero if whole ephemeris): ");
scanf(" %lf",&t1);
if(t1!=0.0)
{
t1 -= 2440400.5;
t1 = STEP*floor(t1/STEP)+2440400.5;
printf("Enter Final Epoch (in JED): ");
scanf(" %lf",&t2);
t2 -= 2440400.5;
t2 = STEP*ceil(t2/STEP)+2440400.5;
}
else
{
t1=0.0;
t2=999999999.0;
}
printf("\nOutput file name: ");
scanf(" %s",buff);
F2=fopen(buff,"wb");
if(F2==NULL){
printf("Cannot open %s file for writting, aborted!\n",buff);
fclose(F1);
return;
}
first=1;
firstblock=1;
for(fnum=DSTART;fnum<=DSTOP;fnum+=DSTEP)
{
/************ YOU SHOULD ADJUST THE FOLLOWING LINE TO YOUR ENVIRONMENT*******/
sprintf(buff,"D:\\de405\\unx%c%04d.%03d",(fnum<0?'m':'p'),(fnum<0?-1*fnum:fnum),DENUM);
/****************************************************************************/
F1=fopen(buff,"rb");
if(F1==NULL)
{
printf("File: %s is not available.\n",buff);
continue;
}
/**** reading first two records from each file (constants, epochs, etc.) ****/
fread(&R1,RECSIZE,1,F1);
fread(&R2,RECSIZE,1,F1);
/**** converting epochs to compare with selected interval *******************/
for(i=0;i<3;++i) reverse(R1.r1.ss+8*i,8);
for(i=0;i<16;++i) B.bb[i]=R1.r1.ss[i];
/* write once the first two records converted. They are identical in all
binary files except two variables: starting and final epochs.
The first record will be overwritten at the end of conversion with those
epochs adjusted to the ephemeris file created */
if(first)
{
reverse(R1.r1.ncon,4);
reverse(R1.r1.au,8);
reverse(R1.r1.emrat,8);
for(i=0;i<40;++i) reverse(R1.r1.other+4*i,4);
for(i=0;i<400;++i) reverse(R2.r2.cval+8*i,8);
fwrite(&R1,RECSIZE,1,F2);
fwrite(&R2,RECSIZE,1,F2);
first=0;
}
/**** checking whether this file contens useful data ************************/
if(B.ss[0] >= t2) break; /* all data for the subinterval copied */
if(B.ss[1] <= t1) continue; /* this file is for previous epochs */
/* main loop of reading, converting and writting ephemeris binary data */
while( fread(buff,RECSIZE,1,F1)==1)
{
/*** fist two variables stored in each block (8 bytes each) are starting
and final epochs for that block of chebyshev polinomial coefficients ***/
reverse(buff,8);
reverse(buff+8,8);
for(i=0;i<16;++i) B.bb[i]=buff[i];
if(B.ss[0] >= t2) break;
if(B.ss[1] <= t1) continue;
if(firstblock)
{
te1=B.ss[0]; /* saving first epoch written */
firstblock=0;
tlast=te1;
tend=B.ss[1];
}
else
{
if(B.ss[0]==tlast) continue; /* allow for double blocks */
if(B.ss[0]!=tend)
{
puts("\nAborted becouse of the gap in binary data.\n");
fnum=9999;
break;
}
}
for(i=2;i<NCOEFF;++i) reverse(buff+i*8,8);
fwrite(buff,RECSIZE,1,F2);
tlast=B.ss[0];
tend=B.ss[1];
}
fclose(F1);
}
/*** all binary data were converted and stored in the new file **************/
/*** now overwrite the first record with corrected epochs *******************/
fflush(F2);
fseek(F2,0,SEEK_SET); /* point to the begining of the file */
B.ss[0]=te1; /* restore first epoch */
B.ss[1]=tend; /* restore last epoch */
for(i=0;i<16;++i) R1.r1.ss[i] = B.bb[i]; /* copy them into first record */
/* reverse the rest of values */
reverse(R1.r1.ncon,4);
reverse(R1.r1.au,8);
reverse(R1.r1.emrat,8);
for(i=0;i<40;++i) reverse(R1.r1.other+4*i,4);
fwrite(&R1,RECSIZE,1,F2); /* ovewrite first record with actual epochs */
fclose(F2);
}
/****************************************************************************/
/* subroutine reverse reverses the order of n nbytes starting from t */
void reverse( unsigned char t[], int n)
{
unsigned char buff[10];
int i;
for(i=0;i<n;++i) buff[n-i-1] = t[i];
for(i=0;i<n;++i) t[i] = buff[i];
}