src/app/util/util.cpp

/**
 *
 *    Copyright (c) 2020-2021 Project CHIP Authors
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include <app/util/util.h>

#include <app-common/zap-generated/attribute-type.h>
#include <app-common/zap-generated/attributes/Accessors.h>
#include <app-common/zap-generated/ids/Clusters.h>
#include <app/util/af.h>
#include <app/util/attribute-storage.h>
#include <app/util/config.h>
#include <app/util/ember-strings.h>
#include <app/util/generic-callbacks.h>
#include <lib/core/CHIPConfig.h>
#include <lib/core/CHIPEncoding.h>
#include <protocols/interaction_model/StatusCode.h>

// TODO: figure out a clear path for compile-time codegen
#include <app/PluginApplicationCallbacks.h>

using namespace chip;

using chip::Protocols::InteractionModel::Status;

// Calculates difference. See EmberAfDifferenceType for the maximum data size
// that this function will support.
EmberAfDifferenceType emberAfGetDifference(uint8_t * pData, EmberAfDifferenceType value, uint8_t dataSize)
{
    EmberAfDifferenceType value2 = 0, diff;
    uint8_t i;

    // only support data types up to 8 bytes
    if (dataSize > sizeof(EmberAfDifferenceType))
    {
        return 0;
    }

    // get the value
    for (i = 0; i < dataSize; i++)
    {
        value2 = value2 << 8;
#if (CHIP_CONFIG_BIG_ENDIAN_TARGET)
        value2 += pData[i];
#else  // BIGENDIAN
        value2 += pData[dataSize - i - 1];
#endif // BIGENDIAN
    }

    if (value > value2)
    {
        diff = value - value2;
    }
    else
    {
        diff = value2 - value;
    }

    return diff;
}

// ****************************************
// Initialize Clusters
// ****************************************
void emberAfInit()
{
    emberAfInitializeAttributes(kInvalidEndpointId);

    MATTER_PLUGINS_INIT

    emAfCallInits();
}

// Cluster init functions that don't have a cluster implementation to define
// them in.
void MatterBallastConfigurationPluginServerInitCallback() {}
void MatterBooleanStatePluginServerInitCallback() {}
void MatterElectricalMeasurementPluginServerInitCallback() {}
void MatterRelativeHumidityMeasurementPluginServerInitCallback() {}
void MatterIlluminanceMeasurementPluginServerInitCallback() {}
void MatterBinaryInputBasicPluginServerInitCallback() {}
void MatterPressureMeasurementPluginServerInitCallback() {}
void MatterTemperatureMeasurementPluginServerInitCallback() {}
void MatterFlowMeasurementPluginServerInitCallback() {}
void MatterOnOffSwitchConfigurationPluginServerInitCallback() {}
void MatterThermostatUserInterfaceConfigurationPluginServerInitCallback() {}
void MatterBridgedDeviceBasicInformationPluginServerInitCallback() {}
void MatterPowerConfigurationPluginServerInitCallback() {}
void MatterPowerProfilePluginServerInitCallback() {}
void MatterPulseWidthModulationPluginServerInitCallback() {}
void MatterAlarmsPluginServerInitCallback() {}
void MatterTimePluginServerInitCallback() {}
void MatterAclPluginServerInitCallback() {}
void MatterPollControlPluginServerInitCallback() {}
void MatterUnitLocalizationPluginServerInitCallback() {}
void MatterProxyValidPluginServerInitCallback() {}
void MatterProxyDiscoveryPluginServerInitCallback() {}
void MatterProxyConfigurationPluginServerInitCallback() {}
void MatterFanControlPluginServerInitCallback() {}
void MatterActivatedCarbonFilterMonitoringPluginServerInitCallback() {}
void MatterHepaFilterMonitoringPluginServerInitCallback() {}
void MatterAirQualityPluginServerInitCallback() {}
void MatterCarbonMonoxideConcentrationMeasurementPluginServerInitCallback() {}
void MatterCarbonDioxideConcentrationMeasurementPluginServerInitCallback() {}
void MatterFormaldehydeConcentrationMeasurementPluginServerInitCallback() {}
void MatterNitrogenDioxideConcentrationMeasurementPluginServerInitCallback() {}
void MatterOzoneConcentrationMeasurementPluginServerInitCallback() {}
void MatterPm10ConcentrationMeasurementPluginServerInitCallback() {}
void MatterPm1ConcentrationMeasurementPluginServerInitCallback() {}
void MatterPm25ConcentrationMeasurementPluginServerInitCallback() {}
void MatterRadonConcentrationMeasurementPluginServerInitCallback() {}
void MatterTotalVolatileOrganicCompoundsConcentrationMeasurementPluginServerInitCallback() {}
void MatterRvcRunModePluginServerInitCallback() {}
void MatterRvcCleanModePluginServerInitCallback() {}
void MatterDishwasherModePluginServerInitCallback() {}
void MatterLaundryWasherModePluginServerInitCallback() {}
void MatterRefrigeratorAndTemperatureControlledCabinetModePluginServerInitCallback() {}
void MatterOperationalStatePluginServerInitCallback() {}
void MatterRvcOperationalStatePluginServerInitCallback() {}
void MatterOvenModePluginServerInitCallback() {}
void MatterOvenCavityOperationalStatePluginServerInitCallback() {}
void MatterDishwasherAlarmPluginServerInitCallback() {}
void MatterMicrowaveOvenModePluginServerInitCallback() {}
void MatterDeviceEnergyManagementModePluginServerInitCallback() {}
void MatterEnergyEvseModePluginServerInitCallback() {}
void MatterPowerTopologyPluginServerInitCallback() {}
void MatterElectricalEnergyMeasurementPluginServerInitCallback() {}
void MatterElectricalPowerMeasurementPluginServerInitCallback() {}

#if (CHIP_CONFIG_BIG_ENDIAN_TARGET)
#define EM_BIG_ENDIAN true
#else
#define EM_BIG_ENDIAN false
#endif

// You can pass in val1 as NULL, which will assume that it is
// pointing to an array of all zeroes. This is used so that
// default value of NULL is treated as all zeroes.
int8_t emberAfCompareValues(const uint8_t * val1, const uint8_t * val2, uint16_t len, bool signedNumber)
{
    if (len == 0)
    {
        // no length means nothing to compare.  Shouldn't even happen, since len is sizeof(some-integer-type).
        return 0;
    }

    if (signedNumber)
    { // signed number comparison
        if (len <= 4)
        { // only number with 32-bits or less is supported
            int32_t accum1 = 0x0;
            int32_t accum2 = 0x0;
            int32_t all1s  = -1;

            for (uint16_t i = 0; i < len; i++)
            {
                uint8_t j = (val1 == nullptr ? 0 : (EM_BIG_ENDIAN ? val1[i] : val1[(len - 1) - i]));
                accum1 |= j << (8 * (len - 1 - i));

                uint8_t k = (EM_BIG_ENDIAN ? val2[i] : val2[(len - 1) - i]);
                accum2 |= k << (8 * (len - 1 - i));
            }

            // sign extending, no need for 32-bits numbers
            if (len < 4)
            {
                if ((accum1 & (1 << (8 * len - 1))) != 0)
                { // check sign
                    accum1 |= all1s - ((1 << (len * 8)) - 1);
                }
                if ((accum2 & (1 << (8 * len - 1))) != 0)
                { // check sign
                    accum2 |= all1s - ((1 << (len * 8)) - 1);
                }
            }

            if (accum1 > accum2)
            {
                return 1;
            }
            if (accum1 < accum2)
            {
                return -1;
            }

            return 0;
        }

        // not supported
        return 0;
    }

    // regular unsigned number comparison
    for (uint16_t i = 0; i < len; i++)
    {
        uint8_t j = (val1 == nullptr ? 0 : (EM_BIG_ENDIAN ? val1[i] : val1[(len - 1) - i]));
        uint8_t k = (EM_BIG_ENDIAN ? val2[i] : val2[(len - 1) - i]);

        if (j > k)
        {
            return 1;
        }
        if (k > j)
        {
            return -1;
        }
    }
    return 0;
}

// Zigbee spec says types between signed 8 bit and signed 64 bit
bool emberAfIsTypeSigned(EmberAfAttributeType dataType)
{
    return (dataType >= ZCL_INT8S_ATTRIBUTE_TYPE && dataType <= ZCL_INT64S_ATTRIBUTE_TYPE);
}

bool emberAfContainsAttribute(chip::EndpointId endpoint, chip::ClusterId clusterId, chip::AttributeId attributeId)
{
    return (emberAfGetServerAttributeIndexByAttributeId(endpoint, clusterId, attributeId) != UINT16_MAX);
}

bool emberAfIsKnownVolatileAttribute(chip::EndpointId endpoint, chip::ClusterId clusterId, chip::AttributeId attributeId)
{
    const EmberAfAttributeMetadata * metadata = emberAfLocateAttributeMetadata(endpoint, clusterId, attributeId);

    if (metadata == nullptr)
    {
        return false;
    }

    return !metadata->IsAutomaticallyPersisted() && !metadata->IsExternal();
}