petermcs
2e51778790
Also added possibility for RMP of encoding large items in-line in the response packet so that the object RP handlers know how much space they really have without the need for a full APDU buffer being maintained.
307 lines
7.6 KiB
C
307 lines
7.6 KiB
C
/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2004-2008 Steve Karg
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA.
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As a special exception, if other files instantiate templates or
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use macros or inline functions from this file, or you compile
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this file and link it with other works to produce a work based
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on this file, this file does not by itself cause the resulting
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work to be covered by the GNU General Public License. However
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the source code for this file must still be made available in
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accordance with section (3) of the GNU General Public License.
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This exception does not invalidate any other reasons why a work
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based on this file might be covered by the GNU General Public
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License.
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-------------------------------------------
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####COPYRIGHTEND####*/
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#include <string.h>
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#include "bacdef.h"
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#include "bacdcode.h"
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#include "bacenum.h"
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#include "bits.h"
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#include "bacstr.h"
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#include "bacint.h"
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#include "bacreal.h"
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/** @file bacreal.c Encode/Decode Floating Point (Real) Types */
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/* NOTE: byte order plays a role in decoding multibyte values */
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/* http://www.unixpapa.com/incnote/byteorder.html */
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#ifndef BIG_ENDIAN
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#error Define BIG_ENDIAN=0 or BIG_ENDIAN=1 for BACnet Stack in compiler settings
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#endif
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/* from clause 20.2.6 Encoding of a Real Number Value */
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/* returns the number of apdu bytes consumed */
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int decode_real(
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uint8_t * apdu,
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float *real_value)
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{
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union {
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uint8_t byte[4];
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float real_value;
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} my_data;
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/* NOTE: assumes the compiler stores float as IEEE-754 float */
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#if BIG_ENDIAN
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my_data.byte[0] = apdu[0];
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my_data.byte[1] = apdu[1];
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my_data.byte[2] = apdu[2];
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my_data.byte[3] = apdu[3];
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#else
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my_data.byte[0] = apdu[3];
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my_data.byte[1] = apdu[2];
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my_data.byte[2] = apdu[1];
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my_data.byte[3] = apdu[0];
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#endif
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*real_value = my_data.real_value;
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return 4;
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}
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int decode_real_safe(
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uint8_t * apdu,
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uint32_t len_value,
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float *real_value)
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{
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if (len_value != 4) {
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*real_value = 0.0f;
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return (int) len_value;
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} else {
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return decode_real(apdu, real_value);
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}
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}
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int decode_context_real(
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uint8_t * apdu,
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uint8_t tag_number,
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float *real_value)
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{
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uint32_t len_value;
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int len = 0;
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if (decode_is_context_tag(&apdu[len], tag_number)) {
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len +=
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decode_tag_number_and_value(&apdu[len], &tag_number, &len_value);
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len += decode_real(&apdu[len], real_value);
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} else {
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len = -1;
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}
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return len;
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}
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/* from clause 20.2.6 Encoding of a Real Number Value */
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/* returns the number of apdu bytes consumed */
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int encode_bacnet_real(
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float value,
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uint8_t * apdu)
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{
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union {
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uint8_t byte[4];
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float real_value;
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} my_data;
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/* NOTE: assumes the compiler stores float as IEEE-754 float */
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my_data.real_value = value;
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#if BIG_ENDIAN
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apdu[0] = my_data.byte[0];
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apdu[1] = my_data.byte[1];
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apdu[2] = my_data.byte[2];
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apdu[3] = my_data.byte[3];
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#else
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apdu[0] = my_data.byte[3];
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apdu[1] = my_data.byte[2];
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apdu[2] = my_data.byte[1];
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apdu[3] = my_data.byte[0];
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#endif
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return 4;
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}
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#if BACNET_USE_DOUBLE
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/* from clause 20.2.7 Encoding of a Double Precision Real Number Value */
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/* returns the number of apdu bytes consumed */
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int decode_double(
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uint8_t * apdu,
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double *double_value)
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{
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union {
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uint8_t byte[8];
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double double_value;
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} my_data;
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/* NOTE: assumes the compiler stores float as IEEE-754 float */
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#if BIG_ENDIAN
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my_data.byte[0] = apdu[0];
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my_data.byte[1] = apdu[1];
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my_data.byte[2] = apdu[2];
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my_data.byte[3] = apdu[3];
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my_data.byte[4] = apdu[4];
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my_data.byte[5] = apdu[5];
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my_data.byte[6] = apdu[6];
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my_data.byte[7] = apdu[7];
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#else
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my_data.byte[0] = apdu[7];
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my_data.byte[1] = apdu[6];
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my_data.byte[2] = apdu[5];
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my_data.byte[3] = apdu[4];
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my_data.byte[4] = apdu[3];
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my_data.byte[5] = apdu[2];
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my_data.byte[6] = apdu[1];
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my_data.byte[7] = apdu[0];
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#endif
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*double_value = my_data.double_value;
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return 8;
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}
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int decode_double_safe(
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uint8_t * apdu,
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uint32_t len_value,
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double *double_value)
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{
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if (len_value != 8) {
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*double_value = 0.0;
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return (int) len_value;
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} else {
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return decode_double(apdu, double_value);
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}
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}
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/* from clause 20.2.7 Encoding of a Double Precision Real Number Value */
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/* returns the number of apdu bytes consumed */
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int encode_bacnet_double(
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double value,
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uint8_t * apdu)
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{
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union {
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uint8_t byte[8];
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double double_value;
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} my_data;
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/* NOTE: assumes the compiler stores float as IEEE-754 float */
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my_data.double_value = value;
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#if BIG_ENDIAN
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apdu[0] = my_data.byte[0];
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apdu[1] = my_data.byte[1];
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apdu[2] = my_data.byte[2];
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apdu[3] = my_data.byte[3];
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apdu[4] = my_data.byte[4];
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apdu[5] = my_data.byte[5];
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apdu[6] = my_data.byte[6];
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apdu[7] = my_data.byte[7];
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#else
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apdu[0] = my_data.byte[7];
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apdu[1] = my_data.byte[6];
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apdu[2] = my_data.byte[5];
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apdu[3] = my_data.byte[4];
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apdu[4] = my_data.byte[3];
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apdu[5] = my_data.byte[2];
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apdu[6] = my_data.byte[1];
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apdu[7] = my_data.byte[0];
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#endif
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return 8;
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}
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int decode_context_double(
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uint8_t * apdu,
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uint8_t tag_number,
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double *double_value)
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{
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uint32_t len_value;
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int len = 0;
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if (decode_is_context_tag(&apdu[len], tag_number)) {
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len +=
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decode_tag_number_and_value(&apdu[len], &tag_number, &len_value);
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len += decode_double(&apdu[len], double_value);
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} else {
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len = -1;
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}
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return len;
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}
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#endif
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/* end of decoding_encoding.c */
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#ifdef TEST
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#include <assert.h>
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#include <string.h>
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#include <ctype.h>
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#include "ctest.h"
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void testBACreal(
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Test * pTest)
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{
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float real_value = 3.14159F, test_real_value = 0.0;
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uint8_t apdu[MAX_APDU] = { 0 };
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int len = 0, test_len = 0;
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len = encode_bacnet_real(real_value, &apdu[0]);
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ct_test(pTest, len == 4);
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test_len = decode_real(&apdu[0], &test_real_value);
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ct_test(pTest, test_len == len);
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ct_test(pTest, test_real_value == real_value);
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}
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void testBACdouble(
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Test * pTest)
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{
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double double_value = 3.1415927, test_double_value = 0.0;
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uint8_t apdu[MAX_APDU] = { 0 };
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int len = 0, test_len = 0;
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len = encode_bacnet_double(double_value, &apdu[0]);
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ct_test(pTest, len == 8);
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test_len = decode_double(&apdu[0], &test_double_value);
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ct_test(pTest, test_len == len);
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ct_test(pTest, test_double_value == double_value);
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}
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#ifdef TEST_BACNET_REAL
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int main(
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void)
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{
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Test *pTest;
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bool rc;
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pTest = ct_create("BACreal", NULL);
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/* individual tests */
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rc = ct_addTestFunction(pTest, testBACreal);
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assert(rc);
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rc = ct_addTestFunction(pTest, testBACdouble);
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assert(rc);
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/* configure output */
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ct_setStream(pTest, stdout);
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ct_run(pTest);
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(void) ct_report(pTest);
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ct_destroy(pTest);
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return 0;
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}
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#endif /* TEST_BACNET_REAL */
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#endif /* TEST */
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