Steve Karg
1520f2c612
* Added dependent BACnet stack headers into bacdef.h file. * Changed bacdef.h and other stack includes in c/h files to have a common pattern. * Moved bits.h, bytes.h, and bacnet_stack_exports.h under bacnet/basic/sys/ folder.
462 lines
14 KiB
C
462 lines
14 KiB
C
/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2004 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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/* BACnet Integer encoding and decoding */
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#include <stdint.h>
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#include <stdbool.h>
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/* BACnet Stack defines - first */
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#include "bacnet/bacdef.h"
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/* BACnet Stack API */
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#include "bacnet/bacint.h"
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/** @file bacint.c Encode/Decode Integer Types */
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int encode_unsigned16(uint8_t *apdu, uint16_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)((value & 0xff00) >> 8);
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apdu[1] = (uint8_t)(value & 0x00ff);
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}
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return 2;
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}
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int decode_unsigned16(uint8_t *apdu, uint16_t *value)
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{
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if (apdu && value) {
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*value = (uint16_t)((((uint16_t)apdu[0]) << 8) & 0xff00);
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*value |= ((uint16_t)(((uint16_t)apdu[1]) & 0x00ff));
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}
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return 2;
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}
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int encode_unsigned24(uint8_t *apdu, uint32_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)((value & 0xff0000) >> 16);
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apdu[1] = (uint8_t)((value & 0x00ff00) >> 8);
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apdu[2] = (uint8_t)(value & 0x0000ff);
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}
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return 3;
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}
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int decode_unsigned24(uint8_t *apdu, uint32_t *value)
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{
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if (apdu && value) {
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*value = ((uint32_t)((((uint32_t)apdu[0]) << 16) & 0x00ff0000));
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*value |= (uint32_t)((((uint32_t)apdu[1]) << 8) & 0x0000ff00);
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*value |= ((uint32_t)(((uint32_t)apdu[2]) & 0x000000ff));
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}
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return 3;
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}
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int encode_unsigned32(uint8_t *apdu, uint32_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)((value & 0xff000000) >> 24);
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apdu[1] = (uint8_t)((value & 0x00ff0000) >> 16);
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apdu[2] = (uint8_t)((value & 0x0000ff00) >> 8);
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apdu[3] = (uint8_t)(value & 0x000000ff);
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}
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return 4;
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}
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int decode_unsigned32(uint8_t *apdu, uint32_t *value)
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{
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if (apdu && value) {
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*value = ((uint32_t)((((uint32_t)apdu[0]) << 24) & 0xff000000));
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*value |= ((uint32_t)((((uint32_t)apdu[1]) << 16) & 0x00ff0000));
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*value |= ((uint32_t)((((uint32_t)apdu[2]) << 8) & 0x0000ff00));
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*value |= ((uint32_t)(((uint32_t)apdu[3]) & 0x000000ff));
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}
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return 4;
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}
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#ifdef UINT64_MAX
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/**
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* @brief Encode a 40-bit unsigned value into buffer
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* @param buffer - pointer to bytes for storing encoding
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* @param value - 40-bit value to encode
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* @return Returns the number of bytes encoded
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*/
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int encode_unsigned40(uint8_t *buffer, uint64_t value)
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{
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if (buffer) {
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buffer[0] = (uint8_t)((value & 0x000000ff00000000ULL) >> 32);
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buffer[1] = (uint8_t)((value & 0x00000000ff000000ULL) >> 24);
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buffer[2] = (uint8_t)((value & 0x0000000000ff0000ULL) >> 16);
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buffer[3] = (uint8_t)((value & 0x000000000000ff00ULL) >> 8);
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buffer[4] = (uint8_t)(value & 0x00000000000000ffULL);
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}
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return 5;
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}
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/**
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* @brief Decode a 40-bit unsigned value from a buffer
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* @param buffer - pointer to bytes for used for decoding
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* @param value - pointer to 64-bit value to store the decoded value
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* @return Returns the number of bytes decoded
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*/
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int decode_unsigned40(uint8_t *buffer, uint64_t *value)
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{
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if (buffer && value) {
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*value =
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((uint64_t)((((uint64_t)buffer[0]) << 32) & 0x000000ff00000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[1]) << 24) & 0x00000000ff000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[2]) << 16) & 0x0000000000ff0000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[3]) << 8) & 0x000000000000ff00ULL));
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*value |= ((uint64_t)(((uint64_t)buffer[4]) & 0x00000000000000ffULL));
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}
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return 5;
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}
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/**
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* @brief Encode a 48-bit unsigned value into buffer
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* @param buffer - pointer to bytes for storing encoding
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* @param value - 48-bit value to encode
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* @return Returns the number of bytes encoded
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*/
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int encode_unsigned48(uint8_t *buffer, uint64_t value)
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{
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if (buffer) {
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buffer[0] = (uint8_t)((value & 0x0000ff0000000000ULL) >> 40);
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buffer[1] = (uint8_t)((value & 0x000000ff00000000ULL) >> 32);
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buffer[2] = (uint8_t)((value & 0x00000000ff000000ULL) >> 24);
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buffer[3] = (uint8_t)((value & 0x0000000000ff0000ULL) >> 16);
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buffer[4] = (uint8_t)((value & 0x000000000000ff00ULL) >> 8);
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buffer[5] = (uint8_t)(value & 0x00000000000000ffULL);
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}
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return 6;
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}
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/**
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* @brief Decode a 48-bit unsigned value from a buffer
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* @param buffer - pointer to bytes for used for decoding
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* @param value - pointer to 64-bit value to store the decoded value
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* @return Returns the number of bytes decoded
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*/
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int decode_unsigned48(uint8_t *buffer, uint64_t *value)
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{
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if (buffer && value) {
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*value =
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((uint64_t)((((uint64_t)buffer[0]) << 40) & 0x0000ff0000000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[1]) << 32) & 0x000000ff00000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[2]) << 24) & 0x00000000ff000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[3]) << 16) & 0x0000000000ff0000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[4]) << 8) & 0x000000000000ff00ULL));
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*value |= ((uint64_t)(((uint64_t)buffer[5]) & 0x00000000000000ffULL));
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}
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return 6;
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}
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/**
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* @brief Encode a 56-bit unsigned value into buffer
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* @param buffer - pointer to bytes for storing encoding
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* @param value - 56-bit value to encode
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* @return Returns the number of bytes encoded
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*/
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int encode_unsigned56(uint8_t *buffer, uint64_t value)
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{
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if (buffer) {
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buffer[0] = (uint8_t)((value & 0x00ff000000000000ULL) >> 48);
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buffer[1] = (uint8_t)((value & 0x0000ff0000000000ULL) >> 40);
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buffer[2] = (uint8_t)((value & 0x000000ff00000000ULL) >> 32);
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buffer[3] = (uint8_t)((value & 0x00000000ff000000ULL) >> 24);
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buffer[4] = (uint8_t)((value & 0x0000000000ff0000ULL) >> 16);
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buffer[5] = (uint8_t)((value & 0x000000000000ff00ULL) >> 8);
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buffer[6] = (uint8_t)(value & 0x00000000000000ffULL);
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}
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return 7;
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}
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/**
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* @brief Decode a 56-bit unsigned value from a buffer
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* @param buffer - pointer to bytes for used for decoding
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* @param value - pointer to 64-bit value to store the decoded value
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* @return Returns the number of bytes decoded
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*/
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int decode_unsigned56(uint8_t *buffer, uint64_t *value)
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{
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if (buffer && value) {
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*value =
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((uint64_t)((((uint64_t)buffer[0]) << 48) & 0x00ff000000000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[1]) << 40) & 0x0000ff0000000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[2]) << 32) & 0x000000ff00000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[3]) << 24) & 0x00000000ff000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[4]) << 16) & 0x0000000000ff0000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[5]) << 8) & 0x000000000000ff00ULL));
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*value |= ((uint64_t)(((uint64_t)buffer[6]) & 0x00000000000000ffULL));
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}
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return 7;
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}
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/**
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* @brief Encode a 64-bit unsigned value into buffer
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* @param buffer - pointer to bytes for storing encoding
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* @param value - 16-bit value to encode
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* @return Returns the number of bytes encoded
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*/
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int encode_unsigned64(uint8_t *buffer, uint64_t value)
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{
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if (buffer) {
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buffer[0] = (uint8_t)((value & 0xff00000000000000ULL) >> 56);
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buffer[1] = (uint8_t)((value & 0x00ff000000000000ULL) >> 48);
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buffer[2] = (uint8_t)((value & 0x0000ff0000000000ULL) >> 40);
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buffer[3] = (uint8_t)((value & 0x000000ff00000000ULL) >> 32);
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buffer[4] = (uint8_t)((value & 0x00000000ff000000ULL) >> 24);
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buffer[5] = (uint8_t)((value & 0x0000000000ff0000ULL) >> 16);
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buffer[6] = (uint8_t)((value & 0x000000000000ff00ULL) >> 8);
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buffer[7] = (uint8_t)(value & 0x00000000000000ffULL);
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}
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return 8;
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}
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/**
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* @brief Decode a 64-bit unsigned value from a buffer
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* @param buffer - pointer to bytes for used for decoding
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* @param value - pointer to 64-bit value to store the decoded value
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* @return Returns the number of bytes decoded
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*/
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int decode_unsigned64(uint8_t *buffer, uint64_t *value)
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{
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if (buffer && value) {
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*value =
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((uint64_t)((((uint64_t)buffer[0]) << 56) & 0xff00000000000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[1]) << 48) & 0x00ff000000000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[2]) << 40) & 0x0000ff0000000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[3]) << 32) & 0x000000ff00000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[4]) << 24) & 0x00000000ff000000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[5]) << 16) & 0x0000000000ff0000ULL));
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*value |=
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((uint64_t)((((uint64_t)buffer[6]) << 8) & 0x000000000000ff00ULL));
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*value |= ((uint64_t)(((uint64_t)buffer[7]) & 0x00000000000000ffULL));
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}
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return 8;
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}
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#endif
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/**
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* @brief Determine the number of bytes in the value
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* length of unsigned is variable, as per 20.2.4
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* @param value - pointer to 32-bit or 64-bit value
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* @return Returns the number of bytes
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*/
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int bacnet_unsigned_length(BACNET_UNSIGNED_INTEGER value)
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{
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int len = 0; /* return value */
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if (value <= 0xFF) {
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len = 1;
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} else if (value <= 0xFFFF) {
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len = 2;
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} else if (value <= 0xFFFFFF) {
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len = 3;
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} else {
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#ifdef UINT64_MAX
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if (value <= 0x00000000FFFFFFFFULL) {
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len = 4;
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} else if (value <= 0x000000FFFFFFFFFFULL) {
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len = 5;
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} else if (value <= 0x0000FFFFFFFFFFFFULL) {
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len = 6;
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} else if (value <= 0x00FFFFFFFFFFFFFFULL) {
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len = 7;
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} else {
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len = 8;
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}
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#else
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len = 4;
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#endif
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}
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return len;
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}
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#if BACNET_USE_SIGNED
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int encode_signed8(uint8_t *apdu, int8_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)value;
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}
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return 1;
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}
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int decode_signed8(uint8_t *apdu, int32_t *value)
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{
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if (apdu && value) {
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/* negative - bit 7 is set */
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if (apdu[0] & 0x80) {
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*value = 0xFFFFFF00;
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} else {
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*value = 0;
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}
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*value |= ((int32_t)(((int32_t)apdu[0]) & 0x000000ff));
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}
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return 1;
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}
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int encode_signed16(uint8_t *apdu, int16_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)((value & 0xff00) >> 8);
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apdu[1] = (uint8_t)(value & 0x00ff);
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}
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return 2;
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}
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int decode_signed16(uint8_t *apdu, int32_t *value)
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{
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if (apdu && value) {
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/* negative - bit 7 is set */
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if (apdu[0] & 0x80) {
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*value = 0xFFFF0000;
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} else {
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*value = 0;
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}
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*value |= ((int32_t)((((int32_t)apdu[0]) << 8) & 0x0000ff00));
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*value |= ((int32_t)(((int32_t)apdu[1]) & 0x000000ff));
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}
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return 2;
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}
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int encode_signed24(uint8_t *apdu, int32_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)((value & 0xff0000) >> 16);
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apdu[1] = (uint8_t)((value & 0x00ff00) >> 8);
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apdu[2] = (uint8_t)(value & 0x0000ff);
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}
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return 3;
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}
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int decode_signed24(uint8_t *apdu, int32_t *value)
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{
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if (apdu && value) {
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/* negative - bit 7 is set */
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if (apdu[0] & 0x80) {
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*value = 0xFF000000;
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} else {
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*value = 0;
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}
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*value |= ((int32_t)((((int32_t)apdu[0]) << 16) & 0x00ff0000));
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*value |= ((int32_t)((((int32_t)apdu[1]) << 8) & 0x0000ff00));
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*value |= ((int32_t)(((int32_t)apdu[2]) & 0x000000ff));
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}
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return 3;
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}
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int encode_signed32(uint8_t *apdu, int32_t value)
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{
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if (apdu) {
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apdu[0] = (uint8_t)((value & 0xff000000) >> 24);
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apdu[1] = (uint8_t)((value & 0x00ff0000) >> 16);
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apdu[2] = (uint8_t)((value & 0x0000ff00) >> 8);
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apdu[3] = (uint8_t)(value & 0x000000ff);
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}
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return 4;
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}
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int decode_signed32(uint8_t *apdu, int32_t *value)
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{
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if (apdu && value) {
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*value = ((int32_t)((((int32_t)apdu[0]) << 24) & 0xff000000));
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*value |= ((int32_t)((((int32_t)apdu[1]) << 16) & 0x00ff0000));
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*value |= ((int32_t)((((int32_t)apdu[2]) << 8) & 0x0000ff00));
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*value |= ((int32_t)(((int32_t)apdu[3]) & 0x000000ff));
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}
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return 4;
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}
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/**
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* @brief Determines the number of bytes used by a BACnet Signed Integer
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* from clause 20.2.5 Encoding of an Signed Integer Value
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* @param value - signed value
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* @return number of bytes used by a BACnet Signed Integer
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*/
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int bacnet_signed_length(int32_t value)
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{
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int len;
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if ((value >= -128) && (value < 128)) {
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len = 1;
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} else if ((value >= -32768) && (value < 32768)) {
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len = 2;
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} else if ((value >= -8388608) && (value < 8388608)) {
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len = 3;
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} else {
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len = 4;
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}
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return len;
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}
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#endif
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