bi.c

Bacnet protocol stack for linux

/**************************************************************************
*
* Copyright (C) 2006 Steve Karg <[e-mail]>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/

/* Binary Input Objects customize for your use */

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "bacdef.h"
#include "bacdcode.h"
#include "bacenum.h"
#include "config.h"

#define MAX_BINARY_INPUTS 8
#if (MAX_BINARY_INPUTS > 9)
#error Modify the Binary_Input_Name to handle multiple digits
#endif

static BACNET_BINARY_PV Present_Value[MAX_BINARY_INPUTS];

static void Binary_Input_Initialize(
    void)
{
    static bool initialized = false;
    unsigned i;

    if (!initialized) {
        initialized = true;
        for (i = 0; i < MAX_BINARY_INPUTS; i++) {
            Present_Value[i] = BINARY_INACTIVE;
        }
    }
}

/* we simply have 0-n object instances. */
bool Binary_Input_Valid_Instance(
    uint32_t object_instance)
{
    if (object_instance < MAX_BINARY_INPUTS)
        return true;

    return false;
}

/* we simply have 0-n object instances. */
unsigned Binary_Input_Count(
    void)
{
    return MAX_BINARY_INPUTS;
}

/* we simply have 0-n object instances.*/
uint32_t Binary_Input_Index_To_Instance(
    unsigned index)
{
    return index;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need to return the index */
/* that correlates to the correct instance number */
unsigned Binary_Input_Instance_To_Index(
    uint32_t object_instance)
{
    unsigned index = MAX_BINARY_INPUTS;

    if (object_instance < MAX_BINARY_INPUTS)
        index = object_instance;

    return index;
}

static BACNET_BINARY_PV Binary_Input_Present_Value(
    uint32_t object_instance)
{
    BACNET_BINARY_PV value = BINARY_INACTIVE;
    unsigned index = 0;

    Binary_Input_Initialize();
    index = Binary_Input_Instance_To_Index(object_instance);
    if (index < MAX_BINARY_INPUTS) {
        value = Present_Value[index];
    }

    return value;
}

char *Binary_Input_Name(
    uint32_t object_instance)
{
    static char text_string[16] = "BI-0";       /* okay for single thread */

    if (object_instance < MAX_BINARY_INPUTS) {
        text_string[3] = '0' + (uint8_t) object_instance;
        return text_string;
    }

    return NULL;
}

/* return apdu length, or -1 on error */
/* assumption - object already exists, and has been bounds checked */
int Binary_Input_Encode_Property_APDU(
    uint8_t * apdu,
    uint32_t object_instance,
    BACNET_PROPERTY_ID property,
    int32_t array_index,
    BACNET_ERROR_CLASS * error_class,
    BACNET_ERROR_CODE * error_code)
{
    int apdu_len = 0;   /* return value */
    BACNET_BIT_STRING bit_string;
    BACNET_CHARACTER_STRING char_string;
    BACNET_POLARITY polarity = POLARITY_NORMAL;
    BACNET_BINARY_PV value = BINARY_INACTIVE;


    (void) array_index;
    Binary_Input_Initialize();
    switch (property) {
        case PROP_OBJECT_IDENTIFIER:
            apdu_len =
                encode_application_object_id(&apdu[0], OBJECT_BINARY_INPUT,
                object_instance);
            break;
        case PROP_OBJECT_NAME:
        case PROP_DESCRIPTION:
            /* note: object name must be unique in our device */
            characterstring_init_ansi(&char_string,
                Binary_Input_Name(object_instance));
            apdu_len =
                encode_application_character_string(&apdu[0], &char_string);
            break;
        case PROP_OBJECT_TYPE:
            apdu_len =
                encode_application_enumerated(&apdu[0], OBJECT_BINARY_INPUT);
            break;
        case PROP_PRESENT_VALUE:
            value = Binary_Input_Present_Value(object_instance);
            apdu_len = encode_application_enumerated(&apdu[0], value);
            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);
            bitstring_set_bit(&bit_string, STATUS_FLAG_FAULT, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OVERRIDDEN, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OUT_OF_SERVICE, false);
            apdu_len = encode_application_bitstring(&apdu[0], &bit_string);
            break;
        case PROP_EVENT_STATE:
            /* note: see the details in the standard on how to use this */
            apdu_len =
                encode_application_enumerated(&apdu[0], EVENT_STATE_NORMAL);
            break;
        case PROP_OUT_OF_SERVICE:
            apdu_len = encode_application_boolean(&apdu[0], false);
            break;
        case PROP_POLARITY:
            apdu_len = encode_application_enumerated(&apdu[0], polarity);
            break;
        default:
            *error_class = ERROR_CLASS_PROPERTY;
            *error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            apdu_len = -1;
            break;
    }

    return apdu_len;
}

#ifdef TEST
#include <assert.h>
#include <string.h>
#include "ctest.h"

void testBinaryInput(
    Test * pTest)
{
    uint8_t apdu[MAX_APDU] = { 0 };
    int len = 0;
    uint32_t len_value = 0;
    uint8_t tag_number = 0;
    BACNET_OBJECT_TYPE decoded_type = OBJECT_BINARY_OUTPUT;
    uint32_t decoded_instance = 0;
    uint32_t instance = 123;
    BACNET_ERROR_CLASS error_class;
    BACNET_ERROR_CODE error_code;


    /* FIXME: we should do a lot more testing here... */
    len =
        Binary_Input_Encode_Property_APDU(&apdu[0], instance,
        PROP_OBJECT_IDENTIFIER, BACNET_ARRAY_ALL, &error_class, &error_code);
    ct_test(pTest, len >= 0);
    len = decode_tag_number_and_value(&apdu[0], &tag_number, &len_value);
    ct_test(pTest, tag_number == BACNET_APPLICATION_TAG_OBJECT_ID);
    len =
        decode_object_id(&apdu[len], (int *) &decoded_type, &decoded_instance);
    ct_test(pTest, decoded_type == OBJECT_BINARY_INPUT);
    ct_test(pTest, decoded_instance == instance);

    return;
}

#ifdef TEST_BINARY_INPUT
int main(
    void)
{
    Test *pTest;
    bool rc;

    pTest = ct_create("BACnet Binary Input", NULL);
    /* individual tests */
    rc = ct_addTestFunction(pTest, testBinaryInput);
    assert(rc);

    ct_setStream(pTest, stdout);
    ct_run(pTest);
    (void) ct_report(pTest);
    ct_destroy(pTest);

    return 0;
}
#endif /* TEST_BINARY_INPUT */
#endif /* TEST */