assimp/code/PlyParser.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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*/

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


#ifndef ASSIMP_BUILD_NO_PLY_IMPORTER

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

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
PLY::EDataType PLY::Property::ParseDataType(std::vector<char> &buffer) {
  ai_assert(!buffer.empty());

  PLY::EDataType eOut = PLY::EDT_INVALID;

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

  return eOut;
}

// ------------------------------------------------------------------------------------------------
PLY::ESemantic PLY::Property::ParseSemantic(std::vector<char> &buffer) {
  ai_assert(!buffer.empty());

  PLY::ESemantic eOut = PLY::EST_INVALID;
  if (PLY::DOM::TokenMatch(buffer, "red", 3)) {
    eOut = PLY::EST_Red;
  }
  else if (PLY::DOM::TokenMatch(buffer, "green", 5)) {
    eOut = PLY::EST_Green;
  }
  else if (PLY::DOM::TokenMatch(buffer, "blue", 4)) {
    eOut = PLY::EST_Blue;
  }
  else if (PLY::DOM::TokenMatch(buffer, "alpha", 5)) {
    eOut = PLY::EST_Alpha;
  }
  else if (PLY::DOM::TokenMatch(buffer, "vertex_index", 12) || PLY::DOM::TokenMatch(buffer, "vertex_indices", 14)) {
    eOut = PLY::EST_VertexIndex;
  }
  else if (PLY::DOM::TokenMatch(buffer, "texcoord", 8)) // Manage uv coords on faces
  {
    eOut = PLY::EST_TextureCoordinates;
  }
  else if (PLY::DOM::TokenMatch(buffer, "material_index", 14))
  {
    eOut = PLY::EST_MaterialIndex;
  }
  else if (PLY::DOM::TokenMatch(buffer, "ambient_red", 11))
  {
    eOut = PLY::EST_AmbientRed;
  }
  else if (PLY::DOM::TokenMatch(buffer, "ambient_green", 13))
  {
    eOut = PLY::EST_AmbientGreen;
  }
  else if (PLY::DOM::TokenMatch(buffer, "ambient_blue", 12))
  {
    eOut = PLY::EST_AmbientBlue;
  }
  else if (PLY::DOM::TokenMatch(buffer, "ambient_alpha", 13))
  {
    eOut = PLY::EST_AmbientAlpha;
  }
  else if (PLY::DOM::TokenMatch(buffer, "diffuse_red", 11))
  {
    eOut = PLY::EST_DiffuseRed;
  }
  else if (PLY::DOM::TokenMatch(buffer, "diffuse_green", 13))
  {
    eOut = PLY::EST_DiffuseGreen;
  }
  else if (PLY::DOM::TokenMatch(buffer, "diffuse_blue", 12))
  {
    eOut = PLY::EST_DiffuseBlue;
  }
  else if (PLY::DOM::TokenMatch(buffer, "diffuse_alpha", 13))
  {
    eOut = PLY::EST_DiffuseAlpha;
  }
  else if (PLY::DOM::TokenMatch(buffer, "specular_red", 12))
  {
    eOut = PLY::EST_SpecularRed;
  }
  else if (PLY::DOM::TokenMatch(buffer, "specular_green", 14))
  {
    eOut = PLY::EST_SpecularGreen;
  }
  else if (PLY::DOM::TokenMatch(buffer, "specular_blue", 13))
  {
    eOut = PLY::EST_SpecularBlue;
  }
  else if (PLY::DOM::TokenMatch(buffer, "specular_alpha", 14))
  {
    eOut = PLY::EST_SpecularAlpha;
  }
  else if (PLY::DOM::TokenMatch(buffer, "opacity", 7))
  {
    eOut = PLY::EST_Opacity;
  }
  else if (PLY::DOM::TokenMatch(buffer, "specular_power", 14))
  {
    eOut = PLY::EST_PhongPower;
  }
  else if (PLY::DOM::TokenMatch(buffer, "r", 1))
  {
    eOut = PLY::EST_Red;
  }
  else if (PLY::DOM::TokenMatch(buffer, "g", 1))
  {
    eOut = PLY::EST_Green;
  }
  else if (PLY::DOM::TokenMatch(buffer, "b", 1))
  {
    eOut = PLY::EST_Blue;
  }

  // NOTE: Blender3D exports texture coordinates as s,t tuples
  else if (PLY::DOM::TokenMatch(buffer, "u", 1) || PLY::DOM::TokenMatch(buffer, "s", 1) || PLY::DOM::TokenMatch(buffer, "tx", 2) || PLY::DOM::TokenMatch(buffer, "texture_u", 9))
  {
    eOut = PLY::EST_UTextureCoord;
  }
  else if (PLY::DOM::TokenMatch(buffer, "v", 1) || PLY::DOM::TokenMatch(buffer, "t", 1) || PLY::DOM::TokenMatch(buffer, "ty", 2) || PLY::DOM::TokenMatch(buffer, "texture_v", 9))
  {
    eOut = PLY::EST_VTextureCoord;
  }
  else if (PLY::DOM::TokenMatch(buffer, "x", 1))
  {
    eOut = PLY::EST_XCoord;
  }
  else if (PLY::DOM::TokenMatch(buffer, "y", 1)) {
    eOut = PLY::EST_YCoord;
  }
  else if (PLY::DOM::TokenMatch(buffer, "z", 1)) {
    eOut = PLY::EST_ZCoord;
  }
  else if (PLY::DOM::TokenMatch(buffer, "nx", 2)) {
    eOut = PLY::EST_XNormal;
  }
  else if (PLY::DOM::TokenMatch(buffer, "ny", 2)) {
    eOut = PLY::EST_YNormal;
  }
  else if (PLY::DOM::TokenMatch(buffer, "nz", 2)) {
    eOut = PLY::EST_ZNormal;
  }
  else {
    DefaultLogger::get()->info("Found unknown property semantic in file. This is ok");
    PLY::DOM::SkipLine(buffer);
  }
  return eOut;
}

// ------------------------------------------------------------------------------------------------
bool PLY::Property::ParseProperty(std::vector<char> &buffer, PLY::Property* pOut)
{
  ai_assert(!buffer.empty());

  // Forms supported:
  // "property float x"
  // "property list uchar int vertex_index"

  // skip leading spaces
  if (!PLY::DOM::SkipSpaces(buffer)) {
    return false;
  }

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

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

  if (!PLY::DOM::SkipSpaces(buffer))
    return false;

  pOut->Semantic = PLY::Property::ParseSemantic(buffer);

  if (PLY::EST_INVALID == pOut->Semantic)
  {
    DefaultLogger::get()->info("Found unknown semantic in PLY file. This is OK");
    std::string(&buffer[0], &buffer[0] + strlen(&buffer[0]));
  }

  PLY::DOM::SkipSpacesAndLineEnd(buffer);
  return true;
}

// ------------------------------------------------------------------------------------------------
PLY::EElementSemantic PLY::Element::ParseSemantic(std::vector<char> &buffer)
{
  ai_assert(!buffer.empty());

  PLY::EElementSemantic eOut = PLY::EEST_INVALID;
  if (PLY::DOM::TokenMatch(buffer, "vertex", 6))
  {
    eOut = PLY::EEST_Vertex;
  }
  else if (PLY::DOM::TokenMatch(buffer, "face", 4))
  {
    eOut = PLY::EEST_Face;
  }
  else if (PLY::DOM::TokenMatch(buffer, "tristrips", 9))
  {
    eOut = PLY::EEST_TriStrip;
  }
#if 0
  // TODO: maybe implement this?
  else if (PLY::DOM::TokenMatch(buffer,"range_grid",10))
  {
    eOut = PLY::EEST_Face;
  }
#endif
  else if (PLY::DOM::TokenMatch(buffer, "edge", 4))
  {
    eOut = PLY::EEST_Edge;
  }
  else if (PLY::DOM::TokenMatch(buffer, "material", 8))
  {
    eOut = PLY::EEST_Material;
  }
  else if (PLY::DOM::TokenMatch(buffer, "TextureFile", 11))
  {
    eOut = PLY::EEST_TextureFile;
  }

  return eOut;
}

// ------------------------------------------------------------------------------------------------
bool PLY::Element::ParseElement(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, PLY::Element* pOut)
{
  ai_assert(NULL != pOut);
  // Example format: "element vertex 8"

  // skip leading spaces
  if (!PLY::DOM::SkipSpaces(buffer))
  {
    return false;
  }

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

  // parse the semantic of the element
  pOut->eSemantic = PLY::Element::ParseSemantic(buffer);
  if (PLY::EEST_INVALID == pOut->eSemantic)
  {
    // if the exact semantic can't be determined, just store
    // the original string identifier
    pOut->szName = std::string(&buffer[0], &buffer[0] + strlen(&buffer[0]));
  }

  if (!PLY::DOM::SkipSpaces(buffer))
    return false;

  if (PLY::EEST_TextureFile == pOut->eSemantic)
  {
    char* endPos = &buffer[0] + (strlen(&buffer[0]) - 1);
    pOut->szName = std::string(&buffer[0], endPos);

    // go to the next line
    PLY::DOM::SkipSpacesAndLineEnd(buffer);

    return true;
  }

  //parse the number of occurrences of this element
  const char* pCur = (char*)&buffer[0];
  pOut->NumOccur = strtoul10(pCur, &pCur);

  // go to the next line
  PLY::DOM::SkipSpacesAndLineEnd(buffer);

  // now parse all properties of the element
  while (true)
  {
    streamBuffer.getNextLine(buffer);
    pCur = (char*)&buffer[0];

    // skip all comments
    PLY::DOM::SkipComments(buffer);

    PLY::Property prop;
    if (!PLY::Property::ParseProperty(buffer, &prop))
      break;

    pOut->alProperties.push_back(prop);
  }

  return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::SkipSpaces(std::vector<char> &buffer)
{
  const char* pCur = buffer.empty() ? NULL : (char*)&buffer[0];
  bool ret = false;
  if (pCur)
  {
    const char* szCur = pCur;
    ret = Assimp::SkipSpaces(pCur, &pCur);

    uintptr_t iDiff = (uintptr_t)pCur - (uintptr_t)szCur;
    buffer.erase(buffer.begin(), buffer.begin() + iDiff);
    return ret;
  }

  return ret;
}

bool PLY::DOM::SkipLine(std::vector<char> &buffer)
{
  const char* pCur = buffer.empty() ? NULL : (char*)&buffer[0];
  bool ret = false;
  if (pCur)
  {
    const char* szCur = pCur;
    ret = Assimp::SkipLine(pCur, &pCur);

    uintptr_t iDiff = (uintptr_t)pCur - (uintptr_t)szCur;
    buffer.erase(buffer.begin(), buffer.begin() + iDiff);
    return ret;
  }

  return ret;
}

bool PLY::DOM::TokenMatch(std::vector<char> &buffer, const char* token, unsigned int len)
{
  const char* pCur = buffer.empty() ? NULL : (char*)&buffer[0];
  bool ret = false;
  if (pCur)
  {
    const char* szCur = pCur;
    ret = Assimp::TokenMatch(pCur, token, len);

    uintptr_t iDiff = (uintptr_t)pCur - (uintptr_t)szCur;
    buffer.erase(buffer.begin(), buffer.begin() + iDiff);
    return ret;
  }

  return ret;
}

bool PLY::DOM::SkipSpacesAndLineEnd(std::vector<char> &buffer)
{
  const char* pCur = buffer.empty() ? NULL : (char*)&buffer[0];
  bool ret = false;
  if (pCur)
  {
    const char* szCur = pCur;
    ret = Assimp::SkipSpacesAndLineEnd(pCur, &pCur);

    uintptr_t iDiff = (uintptr_t)pCur - (uintptr_t)szCur;
    buffer.erase(buffer.begin(), buffer.begin() + iDiff);
    return ret;
  }

  return ret;
}

bool PLY::DOM::SkipComments(std::vector<char> &buffer)
{
  ai_assert(!buffer.empty());

  std::vector<char> nbuffer = buffer;
  // skip spaces
  if (!SkipSpaces(nbuffer)) {
    return false;
  }

  if (TokenMatch(nbuffer, "comment", 7))
  {
    if (!SkipSpaces(nbuffer))
      SkipLine(nbuffer);

    if (!TokenMatch(nbuffer, "TextureFile", 11))
    {
      SkipLine(nbuffer);
      buffer = nbuffer;
      return true;
    }

    return true;
  }

  return false;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseHeader(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, bool isBinary) {
  DefaultLogger::get()->debug("PLY::DOM::ParseHeader() begin");

  // parse all elements
  while (!buffer.empty())
  {
    // skip all comments
    PLY::DOM::SkipComments(buffer);

    PLY::Element out;
    if (PLY::Element::ParseElement(streamBuffer, buffer, &out))
    {
      // add the element to the list of elements
      alElements.push_back(out);
    }
    else if (TokenMatch(buffer, "end_header", 10))
    {
      // we have reached the end of the header
      break;
    }
    else
    {
      // ignore unknown header elements
      streamBuffer.getNextLine(buffer);
    }
  }

  if (!isBinary) // it would occur an error, if binary data start with values as space or line end.
    SkipSpacesAndLineEnd(buffer);

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

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseElementInstanceLists(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, PLYImporter* loader)
{
  DefaultLogger::get()->debug("PLY::DOM::ParseElementInstanceLists() begin");
  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
  //construct vertices and faces
  for (; i != alElements.end(); ++i, ++a)
  {
    if ((*i).eSemantic == EEST_Vertex || (*i).eSemantic == EEST_Face || (*i).eSemantic == EEST_TriStrip)
    {
      PLY::ElementInstanceList::ParseInstanceList(streamBuffer, buffer, &(*i), NULL, loader);
    }
    else
    {
      (*a).alInstances.resize((*i).NumOccur);
      PLY::ElementInstanceList::ParseInstanceList(streamBuffer, buffer, &(*i), &(*a), NULL);
    }
  }

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

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseElementInstanceListsBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
    const char* &pCur,
    unsigned int &bufferSize,
    PLYImporter* loader,
    bool p_bBE)
{
  DefaultLogger::get()->debug("PLY::DOM::ParseElementInstanceListsBinary() begin");
  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)
  {
    if ((*i).eSemantic == EEST_Vertex || (*i).eSemantic == EEST_Face || (*i).eSemantic == EEST_TriStrip)
    {
      PLY::ElementInstanceList::ParseInstanceListBinary(streamBuffer, buffer, pCur, bufferSize, &(*i), NULL, loader, p_bBE);
    }
    else
    {
      (*a).alInstances.resize((*i).NumOccur);
      PLY::ElementInstanceList::ParseInstanceListBinary(streamBuffer, buffer, pCur, bufferSize, &(*i), &(*a), NULL, p_bBE);
    }
  }

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

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseInstanceBinary(IOStreamBuffer<char> &streamBuffer, DOM* p_pcOut, PLYImporter* loader, bool p_bBE)
{
  ai_assert(NULL != p_pcOut);
  ai_assert(NULL != loader);

  std::vector<char> buffer;
  streamBuffer.getNextLine(buffer);

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

  if (!p_pcOut->ParseHeader(streamBuffer, buffer, true))
  {
    DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() failure");
    return false;
  }

  streamBuffer.getNextBlock(buffer);
  unsigned int bufferSize = static_cast<unsigned int>(buffer.size());
  const char* pCur = (char*)&buffer[0];
  if (!p_pcOut->ParseElementInstanceListsBinary(streamBuffer, buffer, pCur, bufferSize, loader, p_bBE))
  {
    DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() failure");
    return false;
  }
  DefaultLogger::get()->debug("PLY::DOM::ParseInstanceBinary() succeeded");
  return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::DOM::ParseInstance(IOStreamBuffer<char> &streamBuffer, DOM* p_pcOut, PLYImporter* loader)
{
  ai_assert(NULL != p_pcOut);
  ai_assert(NULL != loader);

  std::vector<char> buffer;
  streamBuffer.getNextLine(buffer);

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

  if (!p_pcOut->ParseHeader(streamBuffer, buffer, false))
  {
    DefaultLogger::get()->debug("PLY::DOM::ParseInstance() failure");
    return false;
  }

  //get next line after header
  streamBuffer.getNextLine(buffer);
  if (!p_pcOut->ParseElementInstanceLists(streamBuffer, buffer, loader))
  {
    DefaultLogger::get()->debug("PLY::DOM::ParseInstance() failure");
    return false;
  }
  DefaultLogger::get()->debug("PLY::DOM::ParseInstance() succeeded");
  return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstanceList::ParseInstanceList(
  IOStreamBuffer<char> &streamBuffer,
  std::vector<char> &buffer,
  const PLY::Element* pcElement,
  PLY::ElementInstanceList* p_pcOut,
  PLYImporter* loader)
{
  ai_assert(NULL != pcElement);

  // parse all elements
  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(buffer);
      PLY::DOM::SkipLine(buffer);
      streamBuffer.getNextLine(buffer);
    }
  }
  else
  {
    const char* pCur = (const char*)&buffer[0];
    // be sure to have enough storage
    for (unsigned int i = 0; i < pcElement->NumOccur; ++i)
    {
      if (p_pcOut)
        PLY::ElementInstance::ParseInstance(pCur, pcElement, &p_pcOut->alInstances[i]);
      else
      {
        ElementInstance elt;
        PLY::ElementInstance::ParseInstance(pCur, pcElement, &elt);

        // Create vertex or face
        if (pcElement->eSemantic == EEST_Vertex)
        {
          //call loader instance from here
          loader->LoadVertex(pcElement, &elt, i);
        }
        else if (pcElement->eSemantic == EEST_Face)
        {
          //call loader instance from here
          loader->LoadFace(pcElement, &elt, i);
        }
        else if (pcElement->eSemantic == EEST_TriStrip)
        {
          //call loader instance from here
          loader->LoadFace(pcElement, &elt, i);
        }
      }

      streamBuffer.getNextLine(buffer);
      pCur = (buffer.empty()) ? NULL : (const char*)&buffer[0];
    }
  }
  return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstanceList::ParseInstanceListBinary(
  IOStreamBuffer<char> &streamBuffer,
  std::vector<char> &buffer,
  const char* &pCur,
  unsigned int &bufferSize,
  const PLY::Element* pcElement,
  PLY::ElementInstanceList* p_pcOut,
  PLYImporter* loader,
  bool p_bBE /* = false */)
{
  ai_assert(NULL != pcElement);

  // 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)
  {
    if (p_pcOut)
      PLY::ElementInstance::ParseInstanceBinary(streamBuffer, buffer, pCur, bufferSize, pcElement, &p_pcOut->alInstances[i], p_bBE);
    else
    {
      ElementInstance elt;
      PLY::ElementInstance::ParseInstanceBinary(streamBuffer, buffer, pCur, bufferSize, pcElement, &elt, p_bBE);

      // Create vertex or face
      if (pcElement->eSemantic == EEST_Vertex)
      {
        //call loader instance from here
        loader->LoadVertex(pcElement, &elt, i);
      }
      else if (pcElement->eSemantic == EEST_Face)
      {
        //call loader instance from here
        loader->LoadFace(pcElement, &elt, i);
      }
      else if (pcElement->eSemantic == EEST_TriStrip)
      {
        //call loader instance from here
        loader->LoadFace(pcElement, &elt, i);
      }
    }
  }
  return true;
}

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstance::ParseInstance(const char* &pCur,
  const PLY::Element* pcElement,
  PLY::ElementInstance* p_pcOut)
{
  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::ParseInstance(pCur, &(*a), &(*i))))
    {
      DefaultLogger::get()->warn("Unable to parse property instance. "
        "Skipping this element instance");

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

// ------------------------------------------------------------------------------------------------
bool PLY::ElementInstance::ParseInstanceBinary(
  IOStreamBuffer<char> &streamBuffer,
  std::vector<char> &buffer,
  const char* &pCur,
  unsigned int &bufferSize,
  const PLY::Element* pcElement,
  PLY::ElementInstance* p_pcOut,
  bool p_bBE /* = false */)
{
  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(streamBuffer, buffer, pCur, bufferSize, &(*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));
    }
  }
  return true;
}

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

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

  if (prop->bIsList)
  {
    // parse the number of elements in the list
    PLY::PropertyInstance::ValueUnion v;
    PLY::PropertyInstance::ParseValue(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))
        return false;

      PLY::PropertyInstance::ParseValue(pCur, prop->eType, &p_pcOut->avList[i]);
    }
  }
  else
  {
    // parse the property
    PLY::PropertyInstance::ValueUnion v;

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

// ------------------------------------------------------------------------------------------------
bool PLY::PropertyInstance::ParseInstanceBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
  const char* &pCur,
  unsigned int &bufferSize,
  const PLY::Property* prop,
  PLY::PropertyInstance* p_pcOut,
  bool p_bBE)
{
  ai_assert(NULL != prop);
  ai_assert(NULL != p_pcOut);

  // parse all elements
  if (prop->bIsList)
  {
    // parse the number of elements in the list
    PLY::PropertyInstance::ValueUnion v;
    PLY::PropertyInstance::ParseValueBinary(streamBuffer, buffer, pCur, bufferSize, 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(streamBuffer, buffer, pCur, bufferSize, prop->eType, &p_pcOut->avList[i], p_bBE);
    }
  }
  else
  {
    // parse the property
    PLY::PropertyInstance::ValueUnion v;
    PLY::PropertyInstance::ParseValueBinary(streamBuffer, buffer, pCur, bufferSize, prop->eType, &v, p_bBE);
    p_pcOut->avList.push_back(v);
  }
  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,
  PLY::EDataType eType,
  PLY::PropertyInstance::ValueUnion* out)
{
  ai_assert(NULL != pCur);
  ai_assert(NULL != out);

  //calc element size
  bool ret = true;
  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;

  case EDT_INVALID:
  default:
    ret = false;
    break;
  }

  return ret;
}

// ------------------------------------------------------------------------------------------------
bool PLY::PropertyInstance::ParseValueBinary(IOStreamBuffer<char> &streamBuffer,
  std::vector<char> &buffer,
  const char* &pCur,
  unsigned int &bufferSize,
  PLY::EDataType eType,
  PLY::PropertyInstance::ValueUnion* out,
  bool p_bBE)
{
  ai_assert(NULL != out);

  //calc element size
  unsigned int lsize = 0;
  switch (eType)
  {
  case EDT_Char:
  case EDT_UChar:
    lsize = 1;
    break;

  case EDT_UShort:
  case EDT_Short:
    lsize = 2;
    break;

  case EDT_UInt:
  case EDT_Int:
  case EDT_Float:
    lsize = 4;
    break;

  case EDT_Double:
    lsize = 8;
    break;

  case EDT_INVALID:
  default:
      break;
  }

  //read the next file block if needed
  if (bufferSize < lsize)
  {
    std::vector<char> nbuffer;
    if (streamBuffer.getNextBlock(nbuffer))
    {
      //concat buffer contents
      buffer = std::vector<char>(buffer.end() - bufferSize, buffer.end());
      buffer.insert(buffer.end(), nbuffer.begin(), nbuffer.end());
      nbuffer.clear();
      bufferSize = static_cast<unsigned int>(buffer.size());
      pCur = (char*)&buffer[0];
    }
    else
    {
      throw DeadlyImportError("Invalid .ply file: File corrupted");
    }
  }

  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;
  }

  bufferSize -= lsize;

  return ret;
}

#endif // !! ASSIMP_BUILD_NO_PLY_IMPORTER