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bacnet_stack/src/bacnet/basic/object/bitstring_value.c
T

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C

/**
* @file
* @author Steve Karg <skarg@users.sourceforge.net>
* @date June 2024
* @brief The BitString Value object is an object with a present-value that
* uses a BACnetBitString data type.
* @copyright SPDX-License-Identifier: MIT
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include "bacnet/bacdef.h"
#include "bacnet/bacdcode.h"
#include "bacnet/bacenum.h"
#include "bacnet/bacapp.h"
#include "bacnet/config.h"
#include "bacnet/proplist.h"
#include "bacnet/property.h"
#include "bacnet/rp.h"
#include "bacnet/wp.h"
#include "bacnet/basic/services.h"
#include "bacnet/basic/sys/keylist.h"
/* me! */
#include "bitstring_value.h"
struct object_data {
bool Change_Of_Value : 1;
bool Write_Enabled : 1;
bool Out_Of_Service : 1;
BACNET_BIT_STRING Present_Value;
BACNET_RELIABILITY Reliability;
const char *Object_Name;
const char *Description;
};
/* Key List for storing the object data sorted by instance number */
static OS_Keylist Object_List;
/* callback for present value writes */
static bitstring_value_write_present_value_callback
BitString_Value_Write_Present_Value_Callback;
/* These three arrays are used by the ReadPropertyMultiple handler */
static const int Properties_Required[] = {
PROP_OBJECT_IDENTIFIER, PROP_OBJECT_NAME, PROP_OBJECT_TYPE,
PROP_PRESENT_VALUE, PROP_STATUS_FLAGS, -1
};
static const int Properties_Optional[] = { PROP_RELIABILITY,
PROP_OUT_OF_SERVICE,
PROP_DESCRIPTION, -1 };
static const int Properties_Proprietary[] = { -1 };
/**
* Initialize the pointers for the required, the optional and the properitary
* value properties.
*
* @param pRequired - Pointer to the pointer of required values.
* @param pOptional - Pointer to the pointer of optional values.
* @param pProprietary - Pointer to the pointer of properitary values.
*/
void BitString_Value_Property_Lists(
const int **pRequired, const int **pOptional, const int **pProprietary)
{
if (pRequired) {
*pRequired = Properties_Required;
}
if (pOptional) {
*pOptional = Properties_Optional;
}
if (pProprietary) {
*pProprietary = Properties_Proprietary;
}
return;
}
/**
* @brief Gets an object from the list using an instance number as the key
* @param object_instance - object-instance number of the object
* @return object found in the list, or NULL if not found
*/
static struct object_data *BitString_Value_Object(uint32_t object_instance)
{
return Keylist_Data(Object_List, object_instance);
}
/**
* We simply have 0-n object instances. Yours might be
* more complex, and then you need validate that the
* given instance exists.
*
* @param object_instance Object instance
*
* @return true/false
*/
bool BitString_Value_Valid_Instance(uint32_t object_instance)
{
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
return true;
}
return false;
}
/**
* Return the count of character string values.
*
* @return Count of character string values.
*/
unsigned BitString_Value_Count(void)
{
return Keylist_Count(Object_List);
}
/**
* @brief Determines the object instance-number for a given 0..N index
* of objects where N is the count.
* @param index - 0..N value
* @return object instance-number for a valid given index, or UINT32_MAX
*/
uint32_t BitString_Value_Index_To_Instance(unsigned index)
{
uint32_t instance = UINT32_MAX;
(void)Keylist_Index_Key(Object_List, index, &instance);
return instance;
}
/**
* We simply have 0-n object instances. Yours might be
* more complex, and then you need to return the instance
* that correlates to the correct index.
*
* @param object_instance Object instance
*
* @return Object instance
*/
unsigned BitString_Value_Instance_To_Index(uint32_t object_instance)
{
return Keylist_Index(Object_List, object_instance);
}
/**
* @brief For a given object instance-number, read the present-value.
* @param object_instance - object-instance number of the object
* @param value - Pointer to the new value
* @return true if value is within range and copied
*/
bool BitString_Value_Present_Value(
uint32_t object_instance, BACNET_BIT_STRING *value)
{
bool status = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
status = bitstring_copy(value, &pObject->Present_Value);
}
return status;
}
/**
* @brief For a given object instance-number, sets the present-value,
* taken from another bitstring.
* @param object_instance - object-instance number of the object
* @param value - Pointer to the value.
* @return true if value is within range and copied
*/
bool BitString_Value_Present_Value_Set(
uint32_t object_instance, const BACNET_BIT_STRING *value)
{
bool status = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
if (!bitstring_same(&pObject->Present_Value, value)) {
pObject->Change_Of_Value = true;
}
status = bitstring_copy(&pObject->Present_Value, value);
}
return status;
}
/**
* For a given object instance-number, sets the present-value
* from WriteProperty service
*
* @param object_instance - object-instance number of the object
* @param value - new present value
* @param priority - priority-array index value 1..16
* @param error_class - the BACnet error class
* @param error_code - BACnet Error code
*
* @return true if values are within range and present-value is set.
*/
static bool BitString_Value_Present_Value_Write(
uint32_t object_instance,
BACNET_BIT_STRING *value,
uint8_t priority,
BACNET_ERROR_CLASS *error_class,
BACNET_ERROR_CODE *error_code)
{
bool status = false;
struct object_data *pObject;
BACNET_BIT_STRING old_value;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
(void)priority;
if (pObject->Write_Enabled) {
bitstring_copy(&old_value, &pObject->Present_Value);
bitstring_copy(&pObject->Present_Value, value);
if (pObject->Out_Of_Service) {
/* The physical point that the object represents
is not in service. This means that changes to the
Present_Value property are decoupled from the
physical point when the value of Out_Of_Service
is true. */
} else if (BitString_Value_Write_Present_Value_Callback) {
BitString_Value_Write_Present_Value_Callback(
object_instance, &old_value, value);
}
status = true;
} else {
*error_class = ERROR_CLASS_PROPERTY;
*error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
}
} else {
*error_class = ERROR_CLASS_OBJECT;
*error_code = ERROR_CODE_UNKNOWN_OBJECT;
}
return status;
}
/**
* For a given object instance-number, read the out of service value.
*
* @param object_instance - object-instance number of the object
*
* @return true/false
*/
bool BitString_Value_Out_Of_Service(uint32_t object_instance)
{
bool value = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
value = pObject->Out_Of_Service;
}
return value;
}
/**
* @brief For a given object instance-number, checks the out-of-service for COV
* @param pObject - specific object with valid data
* @param value - out-of-service value
*/
static void BitString_Value_Out_Of_Service_COV_Detect(
struct object_data *pObject, bool value)
{
if (pObject) {
if (pObject->Out_Of_Service != value) {
pObject->Change_Of_Value = true;
}
}
}
/**
* @brief For a given object instance-number, set the out of service value.
* @param object_instance - object-instance number of the object
* @param true/false
*/
void BitString_Value_Out_Of_Service_Set(uint32_t object_instance, bool value)
{
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
BitString_Value_Out_Of_Service_COV_Detect(pObject, value);
pObject->Out_Of_Service = value;
}
return;
}
/**
* For a given object instance-number, sets the out of service flag
* from WriteProperty service
*
* @param object_instance - object-instance number of the object
* @param value - new value
* @param error_class - BACnet error class
* @param error_code - BACnet error code
*
* @return true if value is set, or false if not set or error occurred
*/
static bool BitString_Value_Out_Of_Service_Write(
uint32_t object_instance,
bool value,
BACNET_ERROR_CLASS *error_class,
BACNET_ERROR_CODE *error_code)
{
bool status = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
if (pObject->Write_Enabled) {
BitString_Value_Out_Of_Service_COV_Detect(pObject, value);
pObject->Out_Of_Service = value;
status = true;
} else {
*error_class = ERROR_CLASS_PROPERTY;
*error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
}
} else {
*error_class = ERROR_CLASS_OBJECT;
*error_code = ERROR_CODE_UNKNOWN_OBJECT;
}
return status;
}
/**
* @brief For a given object instance-number, read the reliability value.
* @param object_instance - object-instance number of the object
* @return BACNET_RELIABILITY value
*/
BACNET_RELIABILITY BitString_Value_Reliablity(uint32_t object_instance)
{
BACNET_RELIABILITY value = RELIABILITY_NO_FAULT_DETECTED;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
value = pObject->Reliability;
}
return value;
}
/**
* @brief For a given object, gets the Fault status flag
* @param object_instance - object-instance number of the object
* @return true the status flag is in Fault
*/
static bool BitString_Value_Object_Fault(const struct object_data *pObject)
{
bool fault = false;
if (pObject) {
if (pObject->Reliability != RELIABILITY_NO_FAULT_DETECTED) {
fault = true;
}
}
return fault;
}
/**
* @brief For a given object instance-number, set the reliability value.
* @param object_instance - object-instance number of the object
* @param true/false
*/
bool BitString_Value_Reliablity_Set(
uint32_t object_instance, BACNET_RELIABILITY value)
{
struct object_data *pObject;
bool status = false;
bool fault = false;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
if (value <= 255) {
fault = BitString_Value_Object_Fault(pObject);
pObject->Reliability = value;
if (fault != BitString_Value_Object_Fault(pObject)) {
pObject->Change_Of_Value = true;
}
status = true;
}
pObject->Reliability = value;
}
return status;
}
/**
* @brief For a given object instance-number, gets the Fault status flag
* @param object_instance - object-instance number of the object
* @return true the status flag is in Fault
*/
static bool BitString_Value_Fault(uint32_t object_instance)
{
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
return BitString_Value_Object_Fault(pObject);
}
/**
* @brief Get the COV change flag status
* @param object_instance - object-instance number of the object
* @return the COV change flag status
*/
bool BitString_Value_Change_Of_Value(uint32_t object_instance)
{
bool changed = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
changed = pObject->Change_Of_Value;
}
return changed;
}
/**
* @brief Clear the COV change flag
* @param object_instance - object-instance number of the object
*/
void BitString_Value_Change_Of_Value_Clear(uint32_t object_instance)
{
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
pObject->Change_Of_Value = false;
}
}
/**
* @brief For a given object instance-number,
* loads the value_list with the COV data.
* @param object_instance - object-instance number of the object
* @param value_list - list of COV data
* @return true if the value list is encoded
*/
bool BitString_Value_Encode_Value_List(
uint32_t object_instance, BACNET_PROPERTY_VALUE *value_list)
{
bool status = false;
const bool in_alarm = false;
const bool fault = false;
const bool overridden = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
status = cov_value_list_encode_bit_string(
value_list, &pObject->Present_Value, in_alarm, fault, overridden,
pObject->Out_Of_Service);
}
return status;
}
/**
* For a given object instance-number, loads the object-name into
* a characterstring. Note that the object name must be unique
* within this device.
*
* @param object_instance - object-instance number of the object
* @param object_name - holds the object-name retrieved
*
* @return true if object-name was retrieved
*/
bool BitString_Value_Object_Name(
uint32_t object_instance, BACNET_CHARACTER_STRING *object_name)
{
bool status = false;
struct object_data *pObject;
char name_text[32] = "BITSTRING_VALUE-4194303";
pObject = BitString_Value_Object(object_instance);
if (pObject) {
if (pObject->Object_Name) {
status =
characterstring_init_ansi(object_name, pObject->Object_Name);
} else {
snprintf(
name_text, sizeof(name_text), "BITSTRING_VALUE-%u",
object_instance);
status = characterstring_init_ansi(object_name, name_text);
}
}
return status;
}
/**
* For a given object instance-number, sets the object-name
* Note that the object name must be unique within this device.
*
* @param object_instance - object-instance number of the object
* @param new_name - holds the object-name to be set
*
* @return true if object-name was set
*/
bool BitString_Value_Name_Set(uint32_t object_instance, const char *new_name)
{
bool status = false; /* return value */
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
status = true;
pObject->Object_Name = new_name;
}
return status;
}
/**
* @brief Return the object name C string
* @param object_instance [in] BACnet object instance number
* @return object name or NULL if not found
*/
const char *BitString_Value_Name_ASCII(uint32_t object_instance)
{
const char *name = NULL;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
name = pObject->Object_Name;
}
return name;
}
/**
* @brief For a given object instance-number, return the description.
* @param object_instance - object-instance number of the object
* @return C-string pointer to the description,
* or NULL if object doesn't exist
*/
const char *BitString_Value_Description(uint32_t object_instance)
{
const char *name = NULL; /* return value */
const struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
if (pObject->Description) {
name = pObject->Description;
} else {
name = "";
}
}
return name;
}
/**
* For a given object instance-number, set the description text.
*
* @param object_instance - object-instance number of the object
* @param new_descr - C-String pointer to the string, representing the
* description text
*
* @return True on success, false otherwise.
*/
bool BitString_Value_Description_Set(
uint32_t object_instance, const char *value)
{
bool status = false; /* return value */
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
status = true;
pObject->Description = value;
}
return status;
}
/**
* Return the requested property of the character string value.
*
* @param rpdata Property requested, see for BACNET_READ_PROPERTY_DATA details.
*
* @return apdu len, or BACNET_STATUS_ERROR on error
*/
int BitString_Value_Read_Property(BACNET_READ_PROPERTY_DATA *rpdata)
{
int apdu_len = 0; /* return value */
BACNET_BIT_STRING bit_string;
BACNET_CHARACTER_STRING char_string;
bool state = false;
uint8_t *apdu = NULL;
if ((rpdata == NULL) || (rpdata->application_data == NULL) ||
(rpdata->application_data_len == 0)) {
return 0;
}
apdu = rpdata->application_data;
switch (rpdata->object_property) {
case PROP_OBJECT_IDENTIFIER:
apdu_len = encode_application_object_id(
&apdu[0], OBJECT_BITSTRING_VALUE, rpdata->object_instance);
break;
case PROP_OBJECT_NAME:
if (BitString_Value_Object_Name(
rpdata->object_instance, &char_string)) {
apdu_len =
encode_application_character_string(&apdu[0], &char_string);
}
break;
case PROP_DESCRIPTION:
characterstring_init_ansi(
&char_string,
BitString_Value_Description(rpdata->object_instance));
apdu_len = encode_application_character_string(apdu, &char_string);
break;
case PROP_OBJECT_TYPE:
apdu_len =
encode_application_enumerated(&apdu[0], OBJECT_BITSTRING_VALUE);
break;
case PROP_PRESENT_VALUE:
BitString_Value_Present_Value(rpdata->object_instance, &bit_string);
apdu_len = encode_application_bitstring(&apdu[0], &bit_string);
break;
case PROP_STATUS_FLAGS:
/* note: see the details in the standard on how to use these */
bitstring_init(&bit_string);
bitstring_set_bit(&bit_string, STATUS_FLAG_IN_ALARM, false);
state = BitString_Value_Fault(rpdata->object_instance);
bitstring_set_bit(&bit_string, STATUS_FLAG_FAULT, state);
bitstring_set_bit(&bit_string, STATUS_FLAG_OVERRIDDEN, false);
state = BitString_Value_Out_Of_Service(rpdata->object_instance);
bitstring_set_bit(&bit_string, STATUS_FLAG_OUT_OF_SERVICE, state);
apdu_len = encode_application_bitstring(&apdu[0], &bit_string);
break;
case PROP_OUT_OF_SERVICE:
state = BitString_Value_Out_Of_Service(rpdata->object_instance);
apdu_len = encode_application_boolean(&apdu[0], state);
break;
case PROP_RELIABILITY:
apdu_len = encode_application_enumerated(
&apdu[0], BitString_Value_Reliablity(rpdata->object_instance));
break;
default:
rpdata->error_class = ERROR_CLASS_PROPERTY;
rpdata->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
apdu_len = BACNET_STATUS_ERROR;
break;
}
return apdu_len;
}
/**
* Set the requested property of the character string value.
*
* @param wp_data Property requested, see for BACNET_WRITE_PROPERTY_DATA
* details.
*
* @return true if successful
*/
bool BitString_Value_Write_Property(BACNET_WRITE_PROPERTY_DATA *wp_data)
{
bool status = false; /* return value */
int len = 0;
BACNET_APPLICATION_DATA_VALUE value = { 0 };
if (wp_data == NULL) {
return false;
}
if (wp_data->application_data_len == 0) {
return false;
}
/* Decode the some of the request. */
len = bacapp_decode_application_data(
wp_data->application_data, wp_data->application_data_len, &value);
/* FIXME: len < application_data_len: more data? */
if (len < 0) {
/* error while decoding - a value larger than we can handle */
wp_data->error_class = ERROR_CLASS_PROPERTY;
wp_data->error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
return false;
}
switch (wp_data->object_property) {
case PROP_PRESENT_VALUE:
status = write_property_type_valid(
wp_data, &value, BACNET_APPLICATION_TAG_BIT_STRING);
if (status) {
status = BitString_Value_Present_Value_Write(
wp_data->object_instance, &value.type.Bit_String,
wp_data->priority, &wp_data->error_class,
&wp_data->error_code);
}
break;
case PROP_OUT_OF_SERVICE:
status = write_property_type_valid(
wp_data, &value, BACNET_APPLICATION_TAG_BOOLEAN);
if (status) {
status = BitString_Value_Out_Of_Service_Write(
wp_data->object_instance, value.type.Boolean,
&wp_data->error_class, &wp_data->error_code);
}
break;
default:
if (property_lists_member(
Properties_Required, Properties_Optional,
Properties_Proprietary, wp_data->object_property)) {
wp_data->error_class = ERROR_CLASS_PROPERTY;
wp_data->error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
} else {
wp_data->error_class = ERROR_CLASS_PROPERTY;
wp_data->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
}
break;
}
return status;
}
/**
* @brief Sets a callback used when present-value is written from BACnet
* @param cb - callback used to provide indications
*/
void BitString_Value_Write_Present_Value_Callback_Set(
bitstring_value_write_present_value_callback cb)
{
BitString_Value_Write_Present_Value_Callback = cb;
}
/**
* @brief Determines a object write-enabled flag state
* @param object_instance - object-instance number of the object
* @return write-enabled status flag
*/
bool BitString_Value_Write_Enabled(uint32_t object_instance)
{
bool value = false;
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
value = pObject->Write_Enabled;
}
return value;
}
/**
* @brief For a given object instance-number, sets the write-enabled flag
* @param object_instance - object-instance number of the object
*/
void BitString_Value_Write_Enable(uint32_t object_instance)
{
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
pObject->Write_Enabled = true;
}
}
/**
* @brief For a given object instance-number, clears the write-enabled flag
* @param object_instance - object-instance number of the object
*/
void BitString_Value_Write_Disable(uint32_t object_instance)
{
struct object_data *pObject;
pObject = BitString_Value_Object(object_instance);
if (pObject) {
pObject->Write_Enabled = false;
}
}
/**
* Creates a BitString Value object
* @param object_instance - object-instance number of the object
*/
uint32_t BitString_Value_Create(uint32_t object_instance)
{
struct object_data *pObject = NULL;
int index = 0;
if (object_instance > BACNET_MAX_INSTANCE) {
return BACNET_MAX_INSTANCE;
} else if (object_instance == BACNET_MAX_INSTANCE) {
/* wildcard instance */
/* the Object_Identifier property of the newly created object
shall be initialized to a value that is unique within the
responding BACnet-user device. The method used to generate
the object identifier is a local matter.*/
object_instance = Keylist_Next_Empty_Key(Object_List, 1);
}
pObject = BitString_Value_Object(object_instance);
if (!pObject) {
pObject = calloc(1, sizeof(struct object_data));
if (pObject) {
pObject->Object_Name = NULL;
pObject->Description = NULL;
bitstring_init(&pObject->Present_Value);
pObject->Reliability = RELIABILITY_NO_FAULT_DETECTED;
pObject->Out_Of_Service = false;
pObject->Change_Of_Value = false;
pObject->Write_Enabled = true;
/* add to list */
index = Keylist_Data_Add(Object_List, object_instance, pObject);
if (index < 0) {
free(pObject);
return BACNET_MAX_INSTANCE;
}
} else {
return BACNET_MAX_INSTANCE;
}
}
return object_instance;
}
/**
* Deletes an BitString Value object
* @param object_instance - object-instance number of the object
* @return true if the object is deleted
*/
bool BitString_Value_Delete(uint32_t object_instance)
{
bool status = false;
struct object_data *pObject = NULL;
pObject = Keylist_Data_Delete(Object_List, object_instance);
if (pObject) {
free(pObject);
status = true;
}
return status;
}
/**
* Deletes all the BitString Value objects and their data
*/
void BitString_Value_Cleanup(void)
{
struct object_data *pObject;
if (Object_List) {
do {
pObject = Keylist_Data_Pop(Object_List);
if (pObject) {
free(pObject);
}
} while (pObject);
Keylist_Delete(Object_List);
Object_List = NULL;
}
}
/**
* Initializes the object data
*/
void BitString_Value_Init(void)
{
if (!Object_List) {
Object_List = Keylist_Create();
}
}