+++ /dev/null
-/*
- * Copyright © 2012 Keith Packard <keithp@keithp.com>
- *
- * 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; version 2 of the License.
- *
- * 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, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-
-#if !defined(AO_CONVERT_TEST) && !defined(AO_FLIGHT_TEST)
-#include "ao.h"
-#endif
-
-#ifndef AO_CONST_ATTRIB
-#define AO_CONST_ATTRIB
-#endif
-
-static const alt_t altitude_table[] AO_CONST_ATTRIB = {
-#include "altitude-pa.h"
-};
-
-#ifndef FETCH_ALT
-#define FETCH_ALT(o) altitude_table[o]
-#endif
-
-#define ALT_SCALE (1 << ALT_SHIFT)
-#define ALT_MASK (ALT_SCALE - 1)
-
-alt_t
-ao_pa_to_altitude(int32_t pa)
-{
- int16_t o;
- int16_t part;
- int32_t low, high;
-
- if (pa < 0)
- pa = 0;
- if (pa > 120000L)
- pa = 120000L;
- o = pa >> ALT_SHIFT;
- part = pa & ALT_MASK;
-
- low = (int32_t) FETCH_ALT(o) * (ALT_SCALE - part);
- high = (int32_t) FETCH_ALT(o+1) * part + (ALT_SCALE >> 1);
- return (low + high) >> ALT_SHIFT;
-}
-
-#ifdef AO_CONVERT_TEST
-int32_t
-ao_altitude_to_pa(int32_t alt)
-{
- int32_t span, sub_span;
- uint16_t l, h, m;
- int32_t pa;
-
- l = 0;
- h = NALT - 1;
- while ((h - l) != 1) {
- m = (l + h) >> 1;
- if (altitude_table[m] < alt)
- h = m;
- else
- l = m;
- }
- span = altitude_table[l] - altitude_table[h];
- sub_span = altitude_table[l] - alt;
- pa = ((((int32_t) l * (span - sub_span) + (int32_t) h * sub_span) << ALT_SHIFT) + (span >> 1)) / span;
- if (pa > 120000)
- pa = 120000;
- if (pa < 0)
- pa = 0;
- return pa;
-}
-#endif