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/*============================================================================
WCSLIB 4.8 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2011, Mark Calabretta
This file is part of WCSLIB.
WCSLIB is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
WCSLIB 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see <http://www.gnu.org/licenses/>.
Correspondence concerning WCSLIB may be directed to:
Internet email: mcalabre@atnf.csiro.au
Postal address: Dr. Mark Calabretta
Australia Telescope National Facility, CSIRO
PO Box 76
Epping NSW 1710
AUSTRALIA
Author: Mark Calabretta, Australia Telescope National Facility
http://www.atnf.csiro.au/~mcalabre/index.html
$Id: wcsunits.c,v 4.8.1.1 2011/08/15 08:07:06 cal103 Exp cal103 $
*===========================================================================*/
#include <math.h>
#include "wcsunits.h"
/* Map status return value to message. */
const char *wcsunits_errmsg[] = {
"Success",
"Invalid numeric multiplier",
"Dangling binary operator",
"Invalid symbol in INITIAL context",
"Function in invalid context",
"Invalid symbol in EXPON context",
"Unbalanced bracket",
"Unbalanced parenthesis",
"Consecutive binary operators",
"Internal parser error",
"Non-conformant unit specifications",
"Non-conformant functions",
"Potentially unsafe translation"};
/* Unit types. */
const char *wcsunits_types[] = {
"plane angle",
"solid angle",
"charge",
"mole",
"temperature",
"luminous intensity",
"mass",
"length",
"time",
"beam",
"bin",
"bit",
"count",
"stellar magnitude",
"pixel",
"solar ratio",
"voxel"};
const char *wcsunits_units[] = {
"degree",
"steradian",
"Coulomb",
"mole",
"Kelvin",
"candela",
"kilogram",
"metre",
"second",
"", "", "", "", "", "", "", ""};
const char *wcsunits_funcs[] = {
"none",
"log",
"ln",
"exp"};
/*--------------------------------------------------------------------------*/
int wcsunits(
const char have[],
const char want[],
double *scale,
double *offset,
double *power)
{
return wcsunitse(
have, want, scale, offset, power, 0x0);
}
/* : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : */
int wcsunitse(
const char have[],
const char want[],
double *scale,
double *offset,
double *power,
struct wcserr **err)
{
static const char *function = "wcsunitse";
int func1, func2, i, status;
double scale1, scale2, units1[WCSUNITS_NTYPE], units2[WCSUNITS_NTYPE];
if ((status = wcsulexe(have, &func1, &scale1, units1, err))) {
return status;
}
if ((status = wcsulexe(want, &func2, &scale2, units2, err))) {
return status;
}
/* Check conformance. */
for (i = 0; i < WCSUNITS_NTYPE; i++) {
if (units1[i] != units2[i]) {
return wcserr_set(WCSERR_SET(UNITSERR_BAD_UNIT_SPEC),
"Mismatched units type '%s': have '%s', want '%s'",
wcsunits_types[i], have, want);
}
}
*scale = 0.0;
*offset = 0.0;
*power = 1.0;
switch (func1) {
case 0:
/* No function. */
if (func2) {
return wcserr_set(WCSERR_SET(UNITSERR_BAD_FUNCS),
"Mismatched unit functions: have '%s' (%s), want '%s' (%s)",
have, wcsunits_funcs[func1], want, wcsunits_funcs[func2]);
}
*scale = scale1 / scale2;
break;
case 1:
/* log(). */
if (func2 == 1) {
/* log(). */
*scale = 1.0;
*offset = log10(scale1 / scale2);
} else if (func2 == 2) {
/* ln(). */
*scale = log(10.0);
*offset = log(scale1 / scale2);
} else {
return wcserr_set(WCSERR_SET(UNITSERR_BAD_FUNCS),
"Mismatched unit functions: have '%s' (%s), want '%s' (%s)",
have, wcsunits_funcs[func1], want, wcsunits_funcs[func2]);
}
break;
case 2:
/* ln(). */
if (func2 == 1) {
/* log(). */
*scale = 1.0 / log(10.0);
*offset = log(scale1 / scale2);
} else if (func2 == 2) {
/* ln(). */
*scale = 1.0;
*offset = log(scale1 / scale2);
} else {
return wcserr_set(WCSERR_SET(UNITSERR_BAD_FUNCS),
"Mismatched unit functions: have '%s' (%s), want '%s' (%s)",
have, wcsunits_funcs[func1], want, wcsunits_funcs[func2]);
}
break;
case 3:
/* exp(). */
if (func2 != 3) {
return wcserr_set(WCSERR_SET(UNITSERR_BAD_FUNCS),
"Mismatched unit functions: have '%s' (%s), want '%s' (%s)",
have, wcsunits_funcs[func1], want, wcsunits_funcs[func2]);
}
*scale = 1.0;
*power = scale1 / scale2;
break;
default:
/* Internal parser error. */
return wcserr_set(WCSERR_SET(UNITSERR_PARSER_ERROR),
"Internal units parser error");
}
return 0;
}
/*--------------------------------------------------------------------------*/
int wcsutrn(int ctrl, char unitstr[])
{
return wcsutrne(ctrl, unitstr, 0x0);
}
/*--------------------------------------------------------------------------*/
int wcsulex(const char unitstr[], int *func, double *scale, double units[])
{
return wcsulexe(unitstr, func, scale, units, 0x0);
}
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