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#include <stdio.h>
#ifdef _MSC_VER
#include "stdint.h"
#include "inttypes.h"
#else
#include <stdint.h>
#include <inttypes.h>
#include <strings.h>
#endif
#include <string.h>
#include <stdlib.h>
#if 0 /*3rd party calibration */
#define POI_CA 0x80000034 /*0 */
#define POI_CB 0xF1C71CD4 /*160 */
#define ZERO (POI_CA)
#define SCALE (((double) (POI_CB-POI_CA))/160.)
#endif
#if 0 /*From VW */
#define POI_CA 0x80b60b60 /*1*/
#define POI_CB 0xff49f49f /*179*/
#define SCALE (((double) (POI_CB-POI_CA))/178.)
#define ONE (POI_CA)
#define ZERO (ONE - (uint32_t) (SCALE+.5))
#endif
#if 1 /*From James*/
#define ZERO 0x80000000
#define SCALE (((float) 0x7FFFFFFF)/180.)
#endif
static void
fromz (int64_t a, double *lat, double *lon)
{
uint64_t b, c;
uint32_t d, e, f;
memcpy (&b, &a, sizeof (a));
e = f = 0;
for (c = 1, d = 1; c; c <<= 1, d <<= 1)
{
if (b & c)
e |= d;
c <<= 1;
if (b & c)
f |= d;
}
*lon = e;
*lat = f;
*lon -= ZERO;
*lat -= ZERO;
*lon /= SCALE;
*lat /= SCALE;
}
static void
toz (double lat, double lon, int64_t * a)
{
uint64_t b, c;
uint32_t d, e, f;
lon *= SCALE;
lat *= SCALE;
lon += ZERO;
lat += ZERO;
e = (uint32_t) (lon + .5);
f = (uint32_t) (lat + .5);
//printf("%.1f %x\n",lat-ZERO, e,f);
b = 0;
for (c = 1, d = 1; c; c <<= 1, d <<= 1)
{
if (e & d)
b |= c;
c <<= 1;
if (f & d)
b |= c;
}
memcpy (a, &b, sizeof (*a));
}
void
librns510_encode (const char *slat, const char *slon, char *out)
{
double lat = atof (slat), lon = atof (slon);
int64_t z;
toz (lat, lon, &z);
sprintf (out, "%" PRId64, z);
}
void
librns510_decode (const char *code, char *slat, char *slon)
{
double lat, lon;
int64_t z;
#ifdef _MSC_VER
sscanf(code, "%" PRId64, &z);
#else
z = atoll (code);
#endif
fromz (z, &lat, &lon);
sprintf (slat, "%.10f", lat);
sprintf (slon, "%.10f", lon);
}
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