path: root/parameter/FixedPointParameterType.cpp

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 * <FILENAME>
 * 
 * INTEL CONFIDENTIAL
 * Copyright © 2011 Intel 
 * Corporation All Rights Reserved.
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 * The source code contained or described herein and all documents related to
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 * 
 *  AUTHOR: Patrick Benavoli (patrickx.benavoli@intel.com)
 * CREATED: 2011-06-01
 * UPDATED: 2011-07-27
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#include "FixedPointParameterType.h"
#include <stdlib.h>
#include <sstream>
#include <iomanip>
#include <assert.h>
#include "Parameter.h"
#include "ParameterAccessContext.h"
#include "ConfigurationAccessContext.h"

#define base CParameterType

CFixedPointParameterType::CFixedPointParameterType(const string& strName) : base(strName), _uiIntegral(0), _uiFractional(0)
{
}

string CFixedPointParameterType::getKind() const
{
    return "FixedPointParameter";
}

// Element properties
void CFixedPointParameterType::showProperties(string& strResult) const
{
    base::showProperties(strResult);

    // Notation
    strResult += "Notation: Q";
    strResult += toString(_uiIntegral);
    strResult += ".";
    strResult += toString(_uiFractional);
    strResult += "\n";
}

// XML Serialization value space handling
// Value space handling for configuration import
void CFixedPointParameterType::handleValueSpaceAttribute(CXmlElement& xmlConfigurableElementSettingsElement, CConfigurationAccessContext& configurationAccessContext) const
{
    // Direction?
    if (!configurationAccessContext.serializeOut()) {

        // Get Value space from XML
        if (xmlConfigurableElementSettingsElement.hasAttribute("ValueSpace")) {

            configurationAccessContext.setValueSpaceRaw(xmlConfigurableElementSettingsElement.getAttributeBoolean("ValueSpace", "Raw"));
        } else {

            configurationAccessContext.setValueSpaceRaw(false);
        }
    } else {
        // Provide value space only if not the default one
        if (configurationAccessContext.valueSpaceIsRaw()) {

            xmlConfigurableElementSettingsElement.setAttributeString("ValueSpace", "Raw");
        }
    }
}

bool CFixedPointParameterType::fromXml(const CXmlElement& xmlElement, CXmlSerializingContext& serializingContext)
{
    // Size
    uint32_t uiSizeInBits = xmlElement.getAttributeInteger("Size");

    // Q notation
    _uiIntegral = xmlElement.getAttributeInteger("Integral");
    _uiFractional = xmlElement.getAttributeInteger("Fractional");

    // Size vs. Q notation integrity check
    if (uiSizeInBits < getUtilSizeInBits()) {

        serializingContext.setError("Inconsistent Size vs. Q notation for " + getKind() + " " + xmlElement.getPath() + ": Summing (Integral + _uiFractional + 1) should not exceed given Size (" + xmlElement.getAttributeString("Size") + ")");

        return false;
    }

    // Set the size
    setSize(uiSizeInBits / 8);

    return base::fromXml(xmlElement, serializingContext);
}

bool CFixedPointParameterType::asInteger(const string& strValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const
{
    // Hexa
    bool bValueProvidedAsHexa = !strValue.compare(0, 2, "0x");

    // Check data integrity
    if (bValueProvidedAsHexa && !parameterAccessContext.valueSpaceIsRaw()) {

        parameterAccessContext.setError("Hexadecimal values are not supported for " + getKind() + " when selected value space is real:");

        return false;
    }

    int32_t iData;

    if (parameterAccessContext.valueSpaceIsRaw()) {

        // Get data in integer form
        iData = strtol(strValue.c_str(), NULL, 0);

        if (bValueProvidedAsHexa && isEncodable(iData)) {

            // Sign extend
            signExtend(iData);
        }

    } else {
        double dData = strtod(strValue.c_str(), NULL);

        // Do the conversion
        iData = (int32_t)(dData * (1UL << _uiFractional) + 0.5F - (double)(dData < 0));
        // Left justify
        iData <<= getSize() * 8 - getUtilSizeInBits();
    }

    // Check integrity
    if (!isConsistent(iData)) {

        // Illegal value provided
        parameterAccessContext.setError(getOutOfRangeError(strValue, parameterAccessContext.valueSpaceIsRaw(), bValueProvidedAsHexa));

        return false;
    }

    uiValue = iData;

    return true;
}

void CFixedPointParameterType::asString(const uint32_t& uiValue, string& strValue, CParameterAccessContext& parameterAccessContext) const
{
    int32_t iData = uiValue;

    // Check consistency
    assert(isEncodable(iData));

    // Format
    ostringstream strStream;

    // Raw formatting?
    if (parameterAccessContext.valueSpaceIsRaw()) {

        // Hexa formatting?
        if (parameterAccessContext.outputRawFormatIsHex()) {

            strStream << "0x" << hex << uppercase << setw(getSize()*2) << setfill('0') << (uint32_t)iData;
        } else {

            // Sign extend
            signExtend(iData);

            strStream << iData;
        }
    } else {

        // Sign extend
        signExtend(iData);

        // Unjustify
        iData >>= getSize() * 8 - getUtilSizeInBits();

        double dData = (double)iData / (1UL << _uiFractional);

        strStream << dData;
    }

    strValue = strStream.str();
}

// Util size
uint32_t CFixedPointParameterType::getUtilSizeInBits() const
{
    return _uiIntegral + _uiFractional + 1;
}

// Out of range error
string CFixedPointParameterType::getOutOfRangeError(const string& strValue, bool bRawValueSpace, bool bHexaValue) const
{
    // Min/Max computation
    int32_t iMax = (1L << (getSize() * 8 - 1)) - 1;
    int32_t iMin = -iMax - 1;

    ostringstream strStream;

    strStream << "Value " << strValue << " standing out of admitted ";

    if (!bRawValueSpace) {

        strStream << "real range [" << (double)iMin / (1UL << _uiFractional) << ", "<< (double)iMax / (1UL << _uiFractional) << "]";
    } else {

        strStream << "raw range [";

        if (bHexaValue) {

            // Format Min
            strStream << "0x" << hex << uppercase << setw(getSize()*2) << setfill('0') << makeEncodable(iMin);
            // Format Max
            strStream << ", 0x" << hex << uppercase << setw(getSize()*2) << setfill('0') << makeEncodable(iMax);

        } else {

            strStream << iMin << ", " << iMax;
        }

        strStream << "]";
    }
    strStream <<  " for " << getKind();

    return strStream.str();
}

// Check data is consistent with available range, with respect to its sign
bool CFixedPointParameterType::isConsistent(uint32_t uiData) const
{
    uint32_t uiShift = getSize() * 8;

    if (uiShift == 8 * sizeof(uiData)) {
        // Prevent inappropriate shifts
        return true;
    }

    // Negative value?
    bool bIsValueExpectedNegative = (uiData & (1 << (uiShift - 1))) != 0;

    // Check high bits are clean
    return bIsValueExpectedNegative ? !(~uiData >> uiShift) : !(uiData >> uiShift);
}