assimp/code/PlyParser.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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  following disclaimer.

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*/

/** @file Implementation of the PLY parser class */


#ifndef ASSIMP_BUILD_NO_PLY_IMPORTER

#include "PlyLoader.h"
#include "fast_atof.h"
#include <assimp/DefaultLogger.hpp>
#include "ByteSwapper.h"


using namespace Assimp;

// ------------------------------------------------------------------------------------------------
PLY::EDataType PLY::Property::ParseDataType(const char* pCur,const char** pCurOut) {
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );

    PLY::EDataType eOut = PLY::EDT_INVALID;

    if (TokenMatch(pCur,"char",4) ||
        TokenMatch(pCur,"int8",4))
    {
        eOut = PLY::EDT_Char;
    }
    else if (TokenMatch(pCur,"uchar",5) ||
             TokenMatch(pCur,"uint8",5))
    {
        eOut = PLY::EDT_UChar;
    }
    else if (TokenMatch(pCur,"short",5) ||
             TokenMatch(pCur,"int16",5))
    {
        eOut = PLY::EDT_Short;
    }
    else if (TokenMatch(pCur,"ushort",6) ||
             TokenMatch(pCur,"uint16",6))
    {
        eOut = PLY::EDT_UShort;
    }
    else if (TokenMatch(pCur,"int32",5) || TokenMatch(pCur,"int",3))
    {
        eOut = PLY::EDT_Int;
    }
    else if (TokenMatch(pCur,"uint32",6) || TokenMatch(pCur,"uint",4))
    {
        eOut = PLY::EDT_UInt;
    }
    else if (TokenMatch(pCur,"float",5) || TokenMatch(pCur,"float32",7))
    {
        eOut = PLY::EDT_Float;
    }
    else if (TokenMatch(pCur,"double64",8) || TokenMatch(pCur,"double",6) ||
             TokenMatch(pCur,"float64",7))
    {
        eOut = PLY::EDT_Double;
    }
    if (PLY::EDT_INVALID == eOut)
    {
        DefaultLogger::get()->info("Found unknown data type in PLY file. This is OK");
    }
    *pCurOut = pCur;

    return eOut;
}

// ------------------------------------------------------------------------------------------------
PLY::ESemantic PLY::Property::ParseSemantic(const char* pCur,const char** pCurOut) {
    ai_assert (NULL != pCur );
    ai_assert( NULL != pCurOut );

    PLY::ESemantic eOut = PLY::EST_INVALID;
    if (TokenMatch(pCur,"red",3)) {
        eOut = PLY::EST_Red;
    } else if (TokenMatch(pCur,"green",5)) {
        eOut = PLY::EST_Green;
    } else if (TokenMatch(pCur,"blue",4)) {
        eOut = PLY::EST_Blue;
    } else if (TokenMatch(pCur,"alpha",5)) {
        eOut = PLY::EST_Alpha;
    } else if (TokenMatch(pCur,"vertex_index",12) || TokenMatch(pCur,"vertex_indices",14)) {
        eOut = PLY::EST_VertexIndex;
    }
    else if (TokenMatch(pCur,"material_index",14))
    {
        eOut = PLY::EST_MaterialIndex;
    }
    else if (TokenMatch(pCur,"ambient_red",11))
    {
        eOut = PLY::EST_AmbientRed;
    }
    else if (TokenMatch(pCur,"ambient_green",13))
    {
        eOut = PLY::EST_AmbientGreen;
    }
    else if (TokenMatch(pCur,"ambient_blue",12))
    {
        eOut = PLY::EST_AmbientBlue;
    }
    else if (TokenMatch(pCur,"ambient_alpha",13))
    {
        eOut = PLY::EST_AmbientAlpha;
    }
    else if (TokenMatch(pCur,"diffuse_red",11))
    {
        eOut = PLY::EST_DiffuseRed;
    }
    else if (TokenMatch(pCur,"diffuse_green",13))
    {
        eOut = PLY::EST_DiffuseGreen;
    }
    else if (TokenMatch(pCur,"diffuse_blue",12))
    {
        eOut = PLY::EST_DiffuseBlue;
    }
    else if (TokenMatch(pCur,"diffuse_alpha",13))
    {
        eOut = PLY::EST_DiffuseAlpha;
    }
    else if (TokenMatch(pCur,"specular_red",12))
    {
        eOut = PLY::EST_SpecularRed;
    }
    else if (TokenMatch(pCur,"specular_green",14))
    {
        eOut = PLY::EST_SpecularGreen;
    }
    else if (TokenMatch(pCur,"specular_blue",13))
    {
        eOut = PLY::EST_SpecularBlue;
    }
    else if (TokenMatch(pCur,"specular_alpha",14))
    {
        eOut = PLY::EST_SpecularAlpha;
    }
    else if (TokenMatch(pCur,"opacity",7))
    {
        eOut = PLY::EST_Opacity;
    }
    else if (TokenMatch(pCur,"specular_power",14))
    {
        eOut = PLY::EST_PhongPower;
    }
    else if (TokenMatch(pCur,"r",1))
    {
        eOut = PLY::EST_Red;
    }
    else if (TokenMatch(pCur,"g",1))
    {
        eOut = PLY::EST_Green;
    }
    else if (TokenMatch(pCur,"b",1))
    {
        eOut = PLY::EST_Blue;
    }
    // NOTE: Blender3D exports texture coordinates as s,t tuples
    else if (TokenMatch(pCur,"u",1) ||  TokenMatch(pCur,"s",1) || TokenMatch(pCur,"tx",2))
    {
        eOut = PLY::EST_UTextureCoord;
    }
    else if (TokenMatch(pCur,"v",1) ||  TokenMatch(pCur,"t",1) || TokenMatch(pCur,"ty",2))
    {
        eOut = PLY::EST_VTextureCoord;
    }
    else if (TokenMatch(pCur,"x",1))
    {
        eOut = PLY::EST_XCoord;
    }
    else if (TokenMatch(pCur,"y",1))
    {
        eOut = PLY::EST_YCoord;
    }
    else if (TokenMatch(pCur,"z",1))
    {
        eOut = PLY::EST_ZCoord;
    }
    else if (TokenMatch(pCur,"nx",2))
    {
        eOut = PLY::EST_XNormal;
    }
    else if (TokenMatch(pCur,"ny",2))
    {
        eOut = PLY::EST_YNormal;
    }
    else if (TokenMatch(pCur,"nz",2))
    {
        eOut = PLY::EST_ZNormal;
    }
    else
    {
        DefaultLogger::get()->info("Found unknown property semantic in file. This is ok");
        SkipLine(&pCur);
    }
    *pCurOut = pCur;
    return eOut;
}

// ------------------------------------------------------------------------------------------------
bool PLY::Property::ParseProperty (const char* pCur,
    const char** pCurOut,
    PLY::Property* pOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );

    // Forms supported:
    // "property float x"
    // "property list uchar int vertex_index"
    *pCurOut = pCur;

    // skip leading spaces
    if (!SkipSpaces(pCur,&pCur)) {
        return false;
    }

    // skip the "property" string at the beginning
    if (!TokenMatch(pCur,"property",8))
    {
        // seems not to be a valid property entry
        return false;
    }
    // get next word
    if (!SkipSpaces(pCur,&pCur)) {
        return false;
    }
    if (TokenMatch(pCur,"list",4))
    {
        pOut->bIsList = true;

        // seems to be a list.
        if(EDT_INVALID == (pOut->eFirstType = PLY::Property::ParseDataType(pCur, &pCur)))
        {
            // unable to parse list size data type
            SkipLine(pCur,&pCur);
            *pCurOut = pCur;
            return false;
        }
        if (!SkipSpaces(pCur,&pCur))return false;
        if(EDT_INVALID == (pOut->eType = PLY::Property::ParseDataType(pCur, &pCur)))
        {
            // unable to parse list data type
            SkipLine(pCur,&pCur);
            *pCurOut = pCur;
            return false;
        }
    }
    else
    {
        if(EDT_INVALID == (pOut->eType = PLY::Property::ParseDataType(pCur, &pCur)))
        {
            // unable to parse data type. Skip the property
            SkipLine(pCur,&pCur);
            *pCurOut = pCur;
            return false;
        }
    }

    if (!SkipSpaces(pCur,&pCur))return false;
    const char* szCur = pCur;
    pOut->Semantic = PLY::Property::ParseSemantic(pCur, &pCur);

    if (PLY::EST_INVALID == pOut->Semantic)
    {
        // store the name of the semantic
        uintptr_t iDiff = (uintptr_t)pCur - (uintptr_t)szCur;

        DefaultLogger::get()->info("Found unknown semantic in PLY file. This is OK");
        pOut->szName = std::string(szCur,iDiff);
    }

    SkipSpacesAndLineEnd(pCur,&pCur);
    *pCurOut = pCur;

    return true;
}

// ------------------------------------------------------------------------------------------------
PLY::EElementSemantic PLY::Element::ParseSemantic(const char* pCur,
    const char** pCurOut)
{
    ai_assert(NULL != pCur && NULL != pCurOut);
    PLY::EElementSemantic eOut = PLY::EEST_INVALID;
    if (TokenMatch(pCur,"vertex",6))
    {
        eOut = PLY::EEST_Vertex;
    }
    else if (TokenMatch(pCur,"face",4))
    {
        eOut = PLY::EEST_Face;
    }
#if 0
    // TODO: maybe implement this?
    else if (TokenMatch(pCur,"range_grid",10))
    {
        eOut = PLY::EEST_Face;
    }
#endif
    else if (TokenMatch(pCur,"tristrips",9))
    {
        eOut = PLY::EEST_TriStrip;
    }
    else if (TokenMatch(pCur,"edge",4))
    {
        eOut = PLY::EEST_Edge;
    }
    else if (TokenMatch(pCur,"material",8))
    {
        eOut = PLY::EEST_Material;
    }
    *pCurOut = pCur;

    return eOut;
}

// ------------------------------------------------------------------------------------------------
bool PLY::Element::ParseElement (const char* pCur,
    const char** pCurOut,
    PLY::Element* pOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != pOut );

    // Example format: "element vertex 8"
    *pCurOut = pCur;

    // skip leading spaces
    if (!SkipSpaces(&pCur)) {
        return false;
    }

    // skip the "element" string at the beginning
    if (!TokenMatch(pCur,"element",7))
    {
        // seems not to be a valid property entry
        return false;
    }
    // get next word
    if (!SkipSpaces(&pCur))return false;

    // parse the semantic of the element
    const char* szCur = pCur;
    pOut->eSemantic = PLY::Element::ParseSemantic(pCur,&pCur);
    if (PLY::EEST_INVALID == pOut->eSemantic)
    {
        // if the exact semantic can't be determined, just store
        // the original string identifier
        uintptr_t iDiff = (uintptr_t)pCur - (uintptr_t)szCur;
        pOut->szName = std::string(szCur,iDiff);
    }

    if (!SkipSpaces(&pCur))return false;

    //parse the number of occurrences of this element
    pOut->NumOccur = strtoul10(pCur,&pCur);

    // go to the next line
    SkipSpacesAndLineEnd(pCur,&pCur);

    // now parse all properties of the element
    while(true)
    {
        // skip all comments
        PLY::DOM::SkipComments(pCur,&pCur);

        PLY::Property prop;
        if(!PLY::Property::ParseProperty(pCur,&pCur,&prop))break;
        pOut->alProperties.push_back(prop);
    }
    *pCurOut = pCur;

    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::SkipComments (const char* pCur,
    const char** pCurOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    *pCurOut = pCur;

    // skip spaces
    if (!SkipSpaces(pCur,&pCur)) {
        return false;
    }

    if (TokenMatch(pCur,"comment",7))
    {
        if ( !IsLineEnd(pCur[-1]) )
        {
            SkipLine(pCur,&pCur);
        }
        SkipComments(pCur,&pCur);
        *pCurOut = pCur;
        return true;
    }
    *pCurOut = pCur;

    return false;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseHeader (const char* pCur,const char** pCurOut,bool isBinary) {
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );

    DefaultLogger::get()->debug("PLY::DOM::ParseHeader() begin");

    // after ply and format line
    *pCurOut = pCur;

    // parse all elements
    while ((*pCur) != '\0')
    {
        // skip all comments
        PLY::DOM::SkipComments(pCur,&pCur);

        PLY::Element out;
        if(PLY::Element::ParseElement(pCur,&pCur,&out))
        {
            // add the element to the list of elements
            alElements.push_back(out);
        }
        else if (TokenMatch(pCur,"end_header",10))
        {
            // we have reached the end of the header
            break;
        }
        else
        {
            // ignore unknown header elements
            SkipLine(&pCur);
        }
    }
    if(!isBinary)
    { // it would occur an error, if binary data start with values as space or line end.
        SkipSpacesAndLineEnd(pCur,&pCur);
    }
    *pCurOut = pCur;

    DefaultLogger::get()->debug("PLY::DOM::ParseHeader() succeeded");
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseElementInstanceLists (
    const char* pCur,
    const char** pCurOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );

    DefaultLogger::get()->debug("PLY::DOM::ParseElementInstanceLists() begin");
    *pCurOut = pCur;

    alElementData.resize(alElements.size());

    std::vector<PLY::Element>::const_iterator i = alElements.begin();
    std::vector<PLY::ElementInstanceList>::iterator a = alElementData.begin();

    // parse all element instances
    for (;i != alElements.end();++i,++a)
    {
        (*a).alInstances.resize((*i).NumOccur);
        PLY::ElementInstanceList::ParseInstanceList(pCur,&pCur,&(*i),&(*a));
    }

    DefaultLogger::get()->debug("PLY::DOM::ParseElementInstanceLists() succeeded");
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseElementInstanceListsBinary (
    const char* pCur,
    const char** pCurOut,
    bool p_bBE)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut);

    DefaultLogger::get()->debug("PLY::DOM::ParseElementInstanceListsBinary() begin");
    *pCurOut = pCur;

    alElementData.resize(alElements.size());

    std::vector<PLY::Element>::const_iterator i = alElements.begin();
    std::vector<PLY::ElementInstanceList>::iterator a = alElementData.begin();

    // parse all element instances
    for (;i != alElements.end();++i,++a)
    {
        (*a).alInstances.resize((*i).NumOccur);
        PLY::ElementInstanceList::ParseInstanceListBinary(pCur,&pCur,&(*i),&(*a),p_bBE);
    }

    DefaultLogger::get()->debug("PLY::DOM::ParseElementInstanceListsBinary() succeeded");
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseInstanceBinary (const char* pCur,DOM* p_pcOut,bool p_bBE)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != p_pcOut );

    DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() begin");

    if(!p_pcOut->ParseHeader(pCur,&pCur,true))
    {
        DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() failure");
        return false;
    }
    if(!p_pcOut->ParseElementInstanceListsBinary(pCur,&pCur,p_bBE))
    {
        DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() failure");
        return false;
    }
    DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() succeeded");
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseInstance (const char* pCur,DOM* p_pcOut)
{
    ai_assert(NULL != pCur);
    ai_assert(NULL != p_pcOut);

    DefaultLogger::get()->debug("PLY::DOM::ParseInstance() begin");


    if(!p_pcOut->ParseHeader(pCur,&pCur,false))
    {
        DefaultLogger::get()->debug("PLY::DOM::ParseInstance() failure");
        return false;
    }
    if(!p_pcOut->ParseElementInstanceLists(pCur,&pCur))
    {
        DefaultLogger::get()->debug("PLY::DOM::ParseInstance() failure");
        return false;
    }
    DefaultLogger::get()->debug("PLY::DOM::ParseInstance() succeeded");
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstanceList::ParseInstanceList (
    const char* pCur,
    const char** pCurOut,
    const PLY::Element* pcElement,
    PLY::ElementInstanceList* p_pcOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != pcElement );
    ai_assert( NULL != p_pcOut );

    if (EEST_INVALID == pcElement->eSemantic || pcElement->alProperties.empty())
    {
        // if the element has an unknown semantic we can skip all lines
        // However, there could be comments
        for (unsigned int i = 0; i < pcElement->NumOccur;++i)
        {
            PLY::DOM::SkipComments(pCur,&pCur);
            SkipLine(pCur,&pCur);
        }
    }
    else
    {
        // be sure to have enough storage
        for (unsigned int i = 0; i < pcElement->NumOccur;++i)
        {
            PLY::DOM::SkipComments(pCur,&pCur);
            PLY::ElementInstance::ParseInstance(pCur, &pCur,pcElement,
                &p_pcOut->alInstances[i]);
        }
    }
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstanceList::ParseInstanceListBinary (
    const char* pCur,
    const char** pCurOut,
    const PLY::Element* pcElement,
    PLY::ElementInstanceList* p_pcOut,
    bool p_bBE /* = false */)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != pcElement );
    ai_assert( NULL != p_pcOut );

    // we can add special handling code for unknown element semantics since
    // we can't skip it as a whole block (we don't know its exact size
    // due to the fact that lists could be contained in the property list
    // of the unknown element)
    for (unsigned int i = 0; i < pcElement->NumOccur;++i)
    {
        PLY::ElementInstance::ParseInstanceBinary(pCur, &pCur,pcElement,
            &p_pcOut->alInstances[i], p_bBE);
    }
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstance::ParseInstance (
    const char* pCur,
    const char** pCurOut,
    const PLY::Element* pcElement,
    PLY::ElementInstance* p_pcOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != pcElement );
    ai_assert( NULL != p_pcOut );

    if (!SkipSpaces(pCur, &pCur)) {
        return false;
    }

    // allocate enough storage
    p_pcOut->alProperties.resize(pcElement->alProperties.size());

    std::vector<PLY::PropertyInstance>::iterator i = p_pcOut->alProperties.begin();
    std::vector<PLY::Property>::const_iterator  a = pcElement->alProperties.begin();
    for (;i != p_pcOut->alProperties.end();++i,++a)
    {
        if(!(PLY::PropertyInstance::ParseInstance(pCur, &pCur,&(*a),&(*i))))
        {
            DefaultLogger::get()->warn("Unable to parse property instance. "
                "Skipping this element instance");

            // skip the rest of the instance
            SkipLine(pCur, &pCur);

            PLY::PropertyInstance::ValueUnion v = PLY::PropertyInstance::DefaultValue((*a).eType);
            (*i).avList.push_back(v);
        }
    }
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstance::ParseInstanceBinary (
    const char* pCur,
    const char** pCurOut,
    const PLY::Element* pcElement,
    PLY::ElementInstance* p_pcOut,
    bool p_bBE /* = false */)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != pcElement );
    ai_assert( NULL != p_pcOut );

    // allocate enough storage
    p_pcOut->alProperties.resize(pcElement->alProperties.size());

    std::vector<PLY::PropertyInstance>::iterator i =  p_pcOut->alProperties.begin();
    std::vector<PLY::Property>::const_iterator   a =  pcElement->alProperties.begin();
    for (;i != p_pcOut->alProperties.end();++i,++a)
    {
        if(!(PLY::PropertyInstance::ParseInstanceBinary(pCur, &pCur,&(*a),&(*i),p_bBE)))
        {
            DefaultLogger::get()->warn("Unable to parse binary property instance. "
                "Skipping this element instance");

            (*i).avList.push_back(PLY::PropertyInstance::DefaultValue((*a).eType));
        }
    }
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::PropertyInstance::ParseInstance (const char* pCur,const char** pCurOut,
    const PLY::Property* prop, PLY::PropertyInstance* p_pcOut)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != prop );
    ai_assert( NULL != p_pcOut );

    *pCurOut = pCur;

    // skip spaces at the beginning
    if (!SkipSpaces(pCur, &pCur)) {
        return false;
    }

    if (prop->bIsList)
    {
        // parse the number of elements in the list
        PLY::PropertyInstance::ValueUnion v;
        PLY::PropertyInstance::ParseValue(pCur, &pCur,prop->eFirstType,&v);

        // convert to unsigned int
        unsigned int iNum = PLY::PropertyInstance::ConvertTo<unsigned int>(v,prop->eFirstType);

        // parse all list elements
        p_pcOut->avList.resize(iNum);
        for (unsigned int i = 0; i < iNum;++i)
        {
            if (!SkipSpaces(pCur, &pCur))return false;
            PLY::PropertyInstance::ParseValue(pCur, &pCur,prop->eType,&p_pcOut->avList[i]);
        }
    }
    else
    {
        // parse the property
        PLY::PropertyInstance::ValueUnion v;

        PLY::PropertyInstance::ParseValue(pCur, &pCur,prop->eType,&v);
        p_pcOut->avList.push_back(v);
    }
    SkipSpacesAndLineEnd(pCur, &pCur);
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::PropertyInstance::ParseInstanceBinary (
    const char*  pCur,
    const char** pCurOut,
    const PLY::Property* prop,
    PLY::PropertyInstance* p_pcOut,
    bool p_bBE)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != prop );
    ai_assert( NULL != p_pcOut );

    if (prop->bIsList)
    {
        // parse the number of elements in the list
        PLY::PropertyInstance::ValueUnion v;
        PLY::PropertyInstance::ParseValueBinary(pCur, &pCur,prop->eFirstType,&v,p_bBE);

        // convert to unsigned int
        unsigned int iNum = PLY::PropertyInstance::ConvertTo<unsigned int>(v,prop->eFirstType);

        // parse all list elements
        p_pcOut->avList.resize(iNum);
        for (unsigned int i = 0; i < iNum;++i){
            PLY::PropertyInstance::ParseValueBinary(pCur, &pCur,prop->eType,&p_pcOut->avList[i],p_bBE);
        }
    }
    else
    {
        // parse the property
        PLY::PropertyInstance::ValueUnion v;
        PLY::PropertyInstance::ParseValueBinary(pCur, &pCur,prop->eType,&v,p_bBE);
        p_pcOut->avList.push_back(v);
    }
    *pCurOut = pCur;
    return true;
}

// ------------------------------------------------------------------------------------------------
PLY::PropertyInstance::ValueUnion PLY::PropertyInstance::DefaultValue( PLY::EDataType eType )
{
    PLY::PropertyInstance::ValueUnion out;

    switch (eType)
    {
    case EDT_Float:
        out.fFloat = 0.f;
        return out;

    case EDT_Double:
        out.fDouble = 0.;
        return out;

    default: ;
    };
    out.iUInt = 0;
    return out;
}

// ------------------------------------------------------------------------------------------------
bool PLY::PropertyInstance::ParseValue(
    const char* pCur,
    const char** pCurOut,
    PLY::EDataType eType,
    PLY::PropertyInstance::ValueUnion* out)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != out );

    bool ret = true;
    *pCurOut = pCur;
    switch (eType)
    {
    case EDT_UInt:
    case EDT_UShort:
    case EDT_UChar:

        out->iUInt = (uint32_t)strtoul10(pCur, &pCur);
        break;

    case EDT_Int:
    case EDT_Short:
    case EDT_Char:

        out->iInt = (int32_t)strtol10(pCur, &pCur);
        break;

    case EDT_Float:
        // technically this should cast to float, but people tend to use float descriptors for double data
        // this is the best way to not risk losing precision on import and it doesn't hurt to do this
        ai_real f;
        pCur = fast_atoreal_move<ai_real>(pCur,f);
        out->fFloat = (ai_real)f;
        break;

    case EDT_Double:
        double d;
        pCur = fast_atoreal_move<double>(pCur,d);
        out->fDouble = (double)d;
        break;

    default:
        ret = false;
        break;
    }
    *pCurOut = pCur;

    return ret;
}

// ------------------------------------------------------------------------------------------------
bool PLY::PropertyInstance::ParseValueBinary(
    const char* pCur,
    const char** pCurOut,
    PLY::EDataType eType,
    PLY::PropertyInstance::ValueUnion* out,
    bool p_bBE)
{
    ai_assert( NULL != pCur );
    ai_assert( NULL != pCurOut );
    ai_assert( NULL != out );

    bool ret = true;
    switch (eType)
    {
    case EDT_UInt:
        out->iUInt = (uint32_t)*((uint32_t*)pCur);
        pCur += 4;

        // Swap endianness
        if (p_bBE)ByteSwap::Swap((int32_t*)&out->iUInt);
        break;

    case EDT_UShort:
        {
        uint16_t i = *((uint16_t*)pCur);

        // Swap endianness
        if (p_bBE)ByteSwap::Swap(&i);
        out->iUInt = (uint32_t)i;
        pCur += 2;
        break;
        }

    case EDT_UChar:
        {
        out->iUInt = (uint32_t)(*((uint8_t*)pCur));
        pCur ++;
        break;
        }

    case EDT_Int:
        out->iInt = *((int32_t*)pCur);
        pCur += 4;

        // Swap endianness
        if (p_bBE)ByteSwap::Swap(&out->iInt);
        break;

    case EDT_Short:
        {
        int16_t i = *((int16_t*)pCur);

        // Swap endianness
        if (p_bBE)ByteSwap::Swap(&i);
        out->iInt = (int32_t)i;
        pCur += 2;
        break;
        }

    case EDT_Char:
        out->iInt = (int32_t)*((int8_t*)pCur);
        pCur ++;
        break;

    case EDT_Float:
        {
        out->fFloat = *((float*)pCur);

        // Swap endianness
        if (p_bBE)ByteSwap::Swap((int32_t*)&out->fFloat);
        pCur += 4;
        break;
        }
    case EDT_Double:
        {
        out->fDouble = *((double*)pCur);

        // Swap endianness
        if (p_bBE)ByteSwap::Swap((int64_t*)&out->fDouble);
        pCur += 8;
        break;
        }
    default:
        ret = false;
    }
    *pCurOut = pCur;

    return ret;
}

#endif // !! ASSIMP_BUILD_NO_PLY_IMPORTER