text: /*
  ---------------------------------------------------------------------------
  Open Asset Import Library (assimp)
  ---------------------------------------------------------------------------
  
  Copyright (c) 2006-2012, assimp team
  
  All rights reserved.
  
  Redistribution and use of this software in source and binary forms, 
  with or without modification, are permitted provided that the following 
  conditions are met:
  
  * Redistributions of source code must retain the above
    copyright notice, this list of conditions and the
    following disclaimer.
  
  * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.
  
  * Neither the name of the assimp team, nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of the assimp team.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  ---------------------------------------------------------------------------
  */
  
  /** @file  OFFLoader.cpp
   *  @brief Implementation of the OFF importer class 
   */
  
  #include "AssimpPCH.h"
  #ifndef ASSIMP_BUILD_NO_OFF_IMPORTER
  
  // internal headers
  #include "OFFLoader.h"
  #include "ParsingUtils.h"
  #include "fast_atof.h"
  
  
  using namespace Assimp;
  
  // ------------------------------------------------------------------------------------------------
  // Constructor to be privately used by Importer
  OFFImporter::OFFImporter()
  {}
  
  // ------------------------------------------------------------------------------------------------
  // Destructor, private as well 
  OFFImporter::~OFFImporter()
  {}
  
  // ------------------------------------------------------------------------------------------------
  // Returns whether the class can handle the format of the given file. 
  bool OFFImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
  {
  	const std::string extension = GetExtension(pFile);
  
  	if (extension == "off")
  		return true;
  	else if (!extension.length() || checkSig)
  	{
  		if (!pIOHandler)return true;
  		const char* tokens[] = {"off"};
  		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
  	}
  	return false;
  }
  
  // ------------------------------------------------------------------------------------------------
  void OFFImporter::GetExtensionList(std::set<std::string>& extensions)
  {
  	extensions.insert("off");
  }
  
  // ------------------------------------------------------------------------------------------------
  // Imports the given file into the given scene structure. 
  void OFFImporter::InternReadFile( const std::string& pFile, 
  	aiScene* pScene, IOSystem* pIOHandler)
  {
  	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));
  
  	// Check whether we can read from the file
  	if( file.get() == NULL) {
  		throw DeadlyImportError( "Failed to open OFF file " + pFile + ".");
  	}
  	
  	// allocate storage and copy the contents of the file to a memory buffer
  	std::vector<char> mBuffer2;
  	TextFileToBuffer(file.get(),mBuffer2);
  	const char* buffer = &mBuffer2[0];
  
  	char line[4096];
  	GetNextLine(buffer,line);
  	if ('O' == line[0]) {
  		GetNextLine(buffer,line); // skip the 'OFF' line
  	}
  
  	const char* sz = line; SkipSpaces(&sz);
  	const unsigned int numVertices = strtoul10(sz,&sz);SkipSpaces(&sz);
  	const unsigned int numFaces = strtoul10(sz,&sz);
  
  	pScene->mMeshes = new aiMesh*[ pScene->mNumMeshes = 1 ];
  	aiMesh* mesh = pScene->mMeshes[0] = new aiMesh();
  	aiFace* faces = mesh->mFaces = new aiFace [mesh->mNumFaces = numFaces];
  
  	std::vector<aiVector3D> tempPositions(numVertices);
  
  	// now read all vertex lines
  	for (unsigned int i = 0; i< numVertices;++i)
  	{
  		if(!GetNextLine(buffer,line))
  		{
  			DefaultLogger::get()->error("OFF: The number of verts in the header is incorrect");
  			break;
  		}
  		aiVector3D& v = tempPositions[i];
  
  		sz = line; SkipSpaces(&sz);
  		sz = fast_atoreal_move<float>(sz,(float&)v.x); SkipSpaces(&sz);
  		sz = fast_atoreal_move<float>(sz,(float&)v.y); SkipSpaces(&sz);
  		fast_atoreal_move<float>(sz,(float&)v.z);
  	}
  
  	
  	// First find out how many vertices we'll need
  	const char* old = buffer;
  	for (unsigned int i = 0; i< mesh->mNumFaces;++i)
  	{
  		if(!GetNextLine(buffer,line))
  		{
  			DefaultLogger::get()->error("OFF: The number of faces in the header is incorrect");
  			break;
  		}
  		sz = line;SkipSpaces(&sz);
  		if(!(faces->mNumIndices = strtoul10(sz,&sz)) || faces->mNumIndices > 9)
  		{
  			DefaultLogger::get()->error("OFF: Faces with zero indices aren't allowed");
  			--mesh->mNumFaces;
  			continue;
  		}
  		mesh->mNumVertices += faces->mNumIndices;
  		++faces;
  	}
  
  	if (!mesh->mNumVertices)
  		throw DeadlyImportError("OFF: There are no valid faces");
  
  	// allocate storage for the output vertices
  	aiVector3D* verts = mesh->mVertices = new aiVector3D[mesh->mNumVertices];
  
  	// second: now parse all face indices
  	buffer = old;faces = mesh->mFaces;
  	for (unsigned int i = 0, p = 0; i< mesh->mNumFaces;)
  	{
  		if(!GetNextLine(buffer,line))break;
  
  		unsigned int idx;
  		sz = line;SkipSpaces(&sz);
  		if(!(idx = strtoul10(sz,&sz)) || idx > 9)
  			continue;
  
  		faces->mIndices = new unsigned int [faces->mNumIndices];
  		for (unsigned int m = 0; m < faces->mNumIndices;++m)
  		{
  			SkipSpaces(&sz);
  			if ((idx = strtoul10(sz,&sz)) >= numVertices)
  			{
  				DefaultLogger::get()->error("OFF: Vertex index is out of range");
  				idx = numVertices-1;
  			}
  			faces->mIndices[m] = p++;
  			*verts++ = tempPositions[idx];
  		}
  		++i;
  		++faces;
  	}
  	
  	// generate the output node graph
  	pScene->mRootNode = new aiNode();
  	pScene->mRootNode->mName.Set("<OFFRoot>");
  	pScene->mRootNode->mMeshes = new unsigned int [pScene->mRootNode->mNumMeshes = 1];
  	pScene->mRootNode->mMeshes[0] = 0;
  
  	// generate a default material
  	pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials = 1];
  	aiMaterial* pcMat = new aiMaterial();
  
  	aiColor4D clr(0.6f,0.6f,0.6f,1.0f);
  	pcMat->AddProperty(&clr,1,AI_MATKEY_COLOR_DIFFUSE);
  	pScene->mMaterials[0] = pcMat;
  
  	const int twosided =1;
  	pcMat->AddProperty(&twosided,1,AI_MATKEY_TWOSIDED);
  }
  
  #endif // !! ASSIMP_BUILD_NO_OFF_IMPORTER
  