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

Copyright (c) 2006-2017, assimp team


All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

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  copyright notice, this list of conditions and the
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*/

/** @file Implementation of the AC3D importer class */


#ifndef ASSIMP_BUILD_NO_AC_IMPORTER

// internal headers
#include "ACLoader.h"
#include "ParsingUtils.h"
#include "fast_atof.h"
#include "Subdivision.h"
#include "Importer.h"
#include "BaseImporter.h"
#include <assimp/Importer.hpp>
#include <assimp/light.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/material.h>
#include <assimp/scene.h>
#include <assimp/config.h>
#include <assimp/IOSystem.hpp>
#include <assimp/importerdesc.h>
#include <memory>

using namespace Assimp;

static const aiImporterDesc desc = {
    "AC3D Importer",
    "",
    "",
    "",
    aiImporterFlags_SupportTextFlavour,
    0,
    0,
    0,
    0,
    "ac acc ac3d"
};

// ------------------------------------------------------------------------------------------------
// skip to the next token
#define AI_AC_SKIP_TO_NEXT_TOKEN() \
    if (!SkipSpaces(&buffer)) \
    { \
        DefaultLogger::get()->error("AC3D: Unexpected EOF/EOL"); \
        continue; \
    }

// ------------------------------------------------------------------------------------------------
// read a string (may be enclosed in double quotation marks). buffer must point to "
#define AI_AC_GET_STRING(out) \
    if (*buffer == '\0') { \
        throw DeadlyImportError("AC3D: Unexpected EOF in string"); \
    } \
    ++buffer; \
    const char* sz = buffer; \
    while ('\"' != *buffer) \
    { \
        if (IsLineEnd( *buffer )) \
        { \
            DefaultLogger::get()->error("AC3D: Unexpected EOF/EOL in string"); \
            out = "ERROR"; \
            break; \
        } \
        ++buffer; \
    } \
    if (IsLineEnd( *buffer ))continue; \
    out = std::string(sz,(unsigned int)(buffer-sz)); \
    ++buffer;


// ------------------------------------------------------------------------------------------------
// read 1 to n floats prefixed with an optional predefined identifier
#define AI_AC_CHECKED_LOAD_FLOAT_ARRAY(name,name_length,num,out) \
    AI_AC_SKIP_TO_NEXT_TOKEN(); \
    if (name_length) \
    { \
        if (strncmp(buffer,name,name_length) || !IsSpace(buffer[name_length])) \
        { \
            DefaultLogger::get()->error("AC3D: Unexpexted token. " name " was expected."); \
            continue; \
        } \
        buffer += name_length+1; \
    } \
    for (unsigned int i = 0; i < num;++i) \
    { \
        AI_AC_SKIP_TO_NEXT_TOKEN(); \
        buffer = fast_atoreal_move<float>(buffer,((float*)out)[i]); \
    }


// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
AC3DImporter::AC3DImporter()
    : buffer(),
    configSplitBFCull(),
    configEvalSubdivision(),
    mNumMeshes(),
    mLights(),
    lights(),
    groups(),
    polys(),
    worlds()
{
    // nothing to be done here
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well
AC3DImporter::~AC3DImporter()
{
    // nothing to be done here
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file.
bool AC3DImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
    std::string extension = GetExtension(pFile);

    // fixme: are acc and ac3d *really* used? Some sources say they are
    if(extension == "ac" || extension == "ac3d" || extension == "acc") {
        return true;
    }
    if (!extension.length() || checkSig) {
        uint32_t token = AI_MAKE_MAGIC("AC3D");
        return CheckMagicToken(pIOHandler,pFile,&token,1,0);
    }
    return false;
}

// ------------------------------------------------------------------------------------------------
// Loader meta information
const aiImporterDesc* AC3DImporter::GetInfo () const
{
    return &desc;
}

// ------------------------------------------------------------------------------------------------
// Get a pointer to the next line from the file
bool AC3DImporter::GetNextLine( )
{
    SkipLine(&buffer);
    return SkipSpaces(&buffer);
}

// ------------------------------------------------------------------------------------------------
// Parse an object section in an AC file
void AC3DImporter::LoadObjectSection(std::vector<Object>& objects)
{
    if (!TokenMatch(buffer,"OBJECT",6))
        return;

    SkipSpaces(&buffer);

    ++mNumMeshes;

    objects.push_back(Object());
    Object& obj = objects.back();

    aiLight* light = NULL;
    if (!ASSIMP_strincmp(buffer,"light",5))
    {
        // This is a light source. Add it to the list
        mLights->push_back(light = new aiLight());

        // Return a point light with no attenuation
        light->mType = aiLightSource_POINT;
        light->mColorDiffuse = light->mColorSpecular = aiColor3D(1.f,1.f,1.f);
        light->mAttenuationConstant = 1.f;

        // Generate a default name for both the light source and the node
        // FIXME - what's the right way to print a size_t? Is 'zu' universally available? stick with the safe version.
        light->mName.length = ::ai_snprintf(light->mName.data, MAXLEN, "ACLight_%i",static_cast<unsigned int>(mLights->size())-1);
        obj.name = std::string( light->mName.data );

        DefaultLogger::get()->debug("AC3D: Light source encountered");
        obj.type = Object::Light;
    }
    else if (!ASSIMP_strincmp(buffer,"group",5))
    {
        obj.type = Object::Group;
    }
    else if (!ASSIMP_strincmp(buffer,"world",5))
    {
        obj.type = Object::World;
    }
    else obj.type = Object::Poly;
    while (GetNextLine())
    {
        if (TokenMatch(buffer,"kids",4))
        {
            SkipSpaces(&buffer);
            unsigned int num = strtoul10(buffer,&buffer);
            GetNextLine();
            if (num)
            {
                // load the children of this object recursively
                obj.children.reserve(num);
                for (unsigned int i = 0; i < num; ++i)
                    LoadObjectSection(obj.children);
            }
            return;
        }
        else if (TokenMatch(buffer,"name",4))
        {
            SkipSpaces(&buffer);
            AI_AC_GET_STRING(obj.name);

            // If this is a light source, we'll also need to store
            // the name of the node in it.
            if (light)
            {
                light->mName.Set(obj.name);
            }
        }
        else if (TokenMatch(buffer,"texture",7))
        {
            SkipSpaces(&buffer);
            AI_AC_GET_STRING(obj.texture);
        }
        else if (TokenMatch(buffer,"texrep",6))
        {
            SkipSpaces(&buffer);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,2,&obj.texRepeat);
            if (!obj.texRepeat.x || !obj.texRepeat.y)
                obj.texRepeat = aiVector2D (1.f,1.f);
        }
        else if (TokenMatch(buffer,"texoff",6))
        {
            SkipSpaces(&buffer);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,2,&obj.texOffset);
        }
        else if (TokenMatch(buffer,"rot",3))
        {
            SkipSpaces(&buffer);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,9,&obj.rotation);
        }
        else if (TokenMatch(buffer,"loc",3))
        {
            SkipSpaces(&buffer);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,3,&obj.translation);
        }
        else if (TokenMatch(buffer,"subdiv",6))
        {
            SkipSpaces(&buffer);
            obj.subDiv = strtoul10(buffer,&buffer);
        }
        else if (TokenMatch(buffer,"crease",6))
        {
            SkipSpaces(&buffer);
            obj.crease = fast_atof(buffer);
        }
        else if (TokenMatch(buffer,"numvert",7))
        {
            SkipSpaces(&buffer);

            unsigned int t = strtoul10(buffer,&buffer);
            if (t >= AI_MAX_ALLOC(aiVector3D)) {
                throw DeadlyImportError("AC3D: Too many vertices, would run out of memory");
            }
            obj.vertices.reserve(t);
            for (unsigned int i = 0; i < t;++i)
            {
                if (!GetNextLine())
                {
                    DefaultLogger::get()->error("AC3D: Unexpected EOF: not all vertices have been parsed yet");
                    break;
                }
                else if (!IsNumeric(*buffer))
                {
                    DefaultLogger::get()->error("AC3D: Unexpected token: not all vertices have been parsed yet");
                    --buffer; // make sure the line is processed a second time
                    break;
                }
                obj.vertices.push_back(aiVector3D());
                aiVector3D& v = obj.vertices.back();
                AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,3,&v.x);
            }
        }
        else if (TokenMatch(buffer,"numsurf",7))
        {
            SkipSpaces(&buffer);

            bool Q3DWorkAround = false;

            const unsigned int t = strtoul10(buffer,&buffer);
            obj.surfaces.reserve(t);
            for (unsigned int i = 0; i < t;++i)
            {
                GetNextLine();
                if (!TokenMatch(buffer,"SURF",4))
                {
                    // FIX: this can occur for some files - Quick 3D for
                    // example writes no surf chunks
                    if (!Q3DWorkAround)
                    {
                        DefaultLogger::get()->warn("AC3D: SURF token was expected");
                        DefaultLogger::get()->debug("Continuing with Quick3D Workaround enabled");
                    }
                    --buffer; // make sure the line is processed a second time
                    // break; --- see fix notes above

                    Q3DWorkAround = true;
                }
                SkipSpaces(&buffer);
                obj.surfaces.push_back(Surface());
                Surface& surf = obj.surfaces.back();
                surf.flags = strtoul_cppstyle(buffer);

                while (1)
                {
                    if(!GetNextLine())
                    {
                        throw DeadlyImportError("AC3D: Unexpected EOF: surface is incomplete");
                    }
                    if (TokenMatch(buffer,"mat",3))
                    {
                        SkipSpaces(&buffer);
                        surf.mat = strtoul10(buffer);
                    }
                    else if (TokenMatch(buffer,"refs",4))
                    {
                        // --- see fix notes above
                        if (Q3DWorkAround)
                        {
                            if (!surf.entries.empty())
                            {
                                buffer -= 6;
                                break;
                            }
                        }

                        SkipSpaces(&buffer);
                        const unsigned int m = strtoul10(buffer);
                        surf.entries.reserve(m);

                        obj.numRefs += m;

                        for (unsigned int k = 0; k < m; ++k)
                        {
                            if(!GetNextLine())
                            {
                                DefaultLogger::get()->error("AC3D: Unexpected EOF: surface references are incomplete");
                                break;
                            }
                            surf.entries.push_back(Surface::SurfaceEntry());
                            Surface::SurfaceEntry& entry = surf.entries.back();

                            entry.first = strtoul10(buffer,&buffer);
                            SkipSpaces(&buffer);
                            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,2,&entry.second);
                        }
                    }
                    else
                    {

                        --buffer; // make sure the line is processed a second time
                        break;
                    }
                }
            }
        }
    }
    DefaultLogger::get()->error("AC3D: Unexpected EOF: \'kids\' line was expected");
}

// ------------------------------------------------------------------------------------------------
// Convert a material from AC3DImporter::Material to aiMaterial
void AC3DImporter::ConvertMaterial(const Object& object,
    const Material& matSrc,
    aiMaterial& matDest)
{
    aiString s;

    if (matSrc.name.length())
    {
        s.Set(matSrc.name);
        matDest.AddProperty(&s,AI_MATKEY_NAME);
    }
    if (object.texture.length())
    {
        s.Set(object.texture);
        matDest.AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(0));

        // UV transformation
        if (1.f != object.texRepeat.x || 1.f != object.texRepeat.y ||
            object.texOffset.x        || object.texOffset.y)
        {
            aiUVTransform transform;
            transform.mScaling = object.texRepeat;
            transform.mTranslation = object.texOffset;
            matDest.AddProperty(&transform,1,AI_MATKEY_UVTRANSFORM_DIFFUSE(0));
        }
    }

    matDest.AddProperty<aiColor3D>(&matSrc.rgb,1, AI_MATKEY_COLOR_DIFFUSE);
    matDest.AddProperty<aiColor3D>(&matSrc.amb,1, AI_MATKEY_COLOR_AMBIENT);
    matDest.AddProperty<aiColor3D>(&matSrc.emis,1,AI_MATKEY_COLOR_EMISSIVE);
    matDest.AddProperty<aiColor3D>(&matSrc.spec,1,AI_MATKEY_COLOR_SPECULAR);

    int n;
    if (matSrc.shin)
    {
        n = aiShadingMode_Phong;
        matDest.AddProperty<float>(&matSrc.shin,1,AI_MATKEY_SHININESS);
    }
    else n = aiShadingMode_Gouraud;
    matDest.AddProperty<int>(&n,1,AI_MATKEY_SHADING_MODEL);

    float f = 1.f - matSrc.trans;
    matDest.AddProperty<float>(&f,1,AI_MATKEY_OPACITY);
}

// ------------------------------------------------------------------------------------------------
// Converts the loaded data to the internal verbose representation
aiNode* AC3DImporter::ConvertObjectSection(Object& object,
    std::vector<aiMesh*>& meshes,
    std::vector<aiMaterial*>& outMaterials,
    const std::vector<Material>& materials,
    aiNode* parent)
{
    aiNode* node = new aiNode();
    node->mParent = parent;
    if (object.vertices.size())
    {
        if (!object.surfaces.size() || !object.numRefs)
        {
            /* " An object with 7 vertices (no surfaces, no materials defined).
                 This is a good way of getting point data into AC3D.
                 The Vertex->create convex-surface/object can be used on these
                 vertices to 'wrap' a 3d shape around them "
                 (http://www.opencity.info/html/ac3dfileformat.html)

                 therefore: if no surfaces are defined return point data only
             */

            DefaultLogger::get()->info("AC3D: No surfaces defined in object definition, "
                "a point list is returned");

            meshes.push_back(new aiMesh());
            aiMesh* mesh = meshes.back();

            mesh->mNumFaces = mesh->mNumVertices = (unsigned int)object.vertices.size();
            aiFace* faces = mesh->mFaces = new aiFace[mesh->mNumFaces];
            aiVector3D* verts = mesh->mVertices = new aiVector3D[mesh->mNumVertices];

            for (unsigned int i = 0; i < mesh->mNumVertices;++i,++faces,++verts)
            {
                *verts = object.vertices[i];
                faces->mNumIndices = 1;
                faces->mIndices = new unsigned int[1];
                faces->mIndices[0] = i;
            }

            // use the primary material in this case. this should be the
            // default material if all objects of the file contain points
            // and no faces.
            mesh->mMaterialIndex = 0;
            outMaterials.push_back(new aiMaterial());
            ConvertMaterial(object, materials[0], *outMaterials.back());
        }
        else
        {
            // need to generate one or more meshes for this object.
            // find out how many different materials we have
            typedef std::pair< unsigned int, unsigned int > IntPair;
            typedef std::vector< IntPair > MatTable;
            MatTable needMat(materials.size(),IntPair(0,0));

            std::vector<Surface>::iterator it,end = object.surfaces.end();
            std::vector<Surface::SurfaceEntry>::iterator it2,end2;

            for (it = object.surfaces.begin(); it != end; ++it)
            {
                unsigned int idx = (*it).mat;
                if (idx >= needMat.size())
                {
                    DefaultLogger::get()->error("AC3D: material index is out of range");
                    idx = 0;
                }
                if ((*it).entries.empty())
                {
                    DefaultLogger::get()->warn("AC3D: surface her zero vertex references");
                }

                // validate all vertex indices to make sure we won't crash here
                for (it2  = (*it).entries.begin(),
                     end2 = (*it).entries.end(); it2 != end2; ++it2)
                {
                    if ((*it2).first >= object.vertices.size())
                    {
                        DefaultLogger::get()->warn("AC3D: Invalid vertex reference");
                        (*it2).first = 0;
                    }
                }

                if (!needMat[idx].first)++node->mNumMeshes;

                switch ((*it).flags & 0xf)
                {
                    // closed line
                case 0x1:

                    needMat[idx].first  += (unsigned int)(*it).entries.size();
                    needMat[idx].second += (unsigned int)(*it).entries.size()<<1u;
                    break;

                    // unclosed line
                case 0x2:

                    needMat[idx].first  += (unsigned int)(*it).entries.size()-1;
                    needMat[idx].second += ((unsigned int)(*it).entries.size()-1)<<1u;
                    break;

                    // 0 == polygon, else unknown
                default:

                    if ((*it).flags & 0xf)
                    {
                        DefaultLogger::get()->warn("AC3D: The type flag of a surface is unknown");
                        (*it).flags &= ~(0xf);
                    }

                    // the number of faces increments by one, the number
                    // of vertices by surface.numref.
                    needMat[idx].first++;
                    needMat[idx].second += (unsigned int)(*it).entries.size();
                };
            }
            unsigned int* pip = node->mMeshes = new unsigned int[node->mNumMeshes];
            unsigned int mat = 0;
            const size_t oldm = meshes.size();
            for (MatTable::const_iterator cit = needMat.begin(), cend = needMat.end();
                cit != cend; ++cit, ++mat)
            {
                if (!(*cit).first)continue;

                // allocate a new aiMesh object
                *pip++ = (unsigned int)meshes.size();
                aiMesh* mesh = new aiMesh();
                meshes.push_back(mesh);

                mesh->mMaterialIndex = (unsigned int)outMaterials.size();
                outMaterials.push_back(new aiMaterial());
                ConvertMaterial(object, materials[mat], *outMaterials.back());

                // allocate storage for vertices and normals
                mesh->mNumFaces = (*cit).first;
                if (mesh->mNumFaces == 0) {
                    throw DeadlyImportError("AC3D: No faces");
                } else if (mesh->mNumFaces > AI_MAX_ALLOC(aiFace)) {
                    throw DeadlyImportError("AC3D: Too many faces, would run out of memory");
                }
                aiFace* faces = mesh->mFaces = new aiFace[mesh->mNumFaces];

                mesh->mNumVertices = (*cit).second;
                if (mesh->mNumVertices == 0) {
                    throw DeadlyImportError("AC3D: No vertices");
                } else if (mesh->mNumVertices > AI_MAX_ALLOC(aiVector3D)) {
                    throw DeadlyImportError("AC3D: Too many vertices, would run out of memory");
                }
                aiVector3D* vertices = mesh->mVertices = new aiVector3D[mesh->mNumVertices];
                unsigned int cur = 0;

                // allocate UV coordinates, but only if the texture name for the
                // surface is not empty
                aiVector3D* uv = NULL;
                if(object.texture.length())
                {
                    uv = mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
                    mesh->mNumUVComponents[0] = 2;
                }

                for (it = object.surfaces.begin(); it != end; ++it)
                {
                    if (mat == (*it).mat)
                    {
                        const Surface& src = *it;

                        // closed polygon
                        unsigned int type = (*it).flags & 0xf;
                        if (!type)
                        {
                            aiFace& face = *faces++;
                            if((face.mNumIndices = (unsigned int)src.entries.size()))
                            {
                                face.mIndices = new unsigned int[face.mNumIndices];
                                for (unsigned int i = 0; i < face.mNumIndices;++i,++vertices)
                                {
                                    const Surface::SurfaceEntry& entry = src.entries[i];
                                    face.mIndices[i] = cur++;

                                    // copy vertex positions
                                    if (static_cast<unsigned>(vertices - mesh->mVertices) >= mesh->mNumVertices) {
                                        throw DeadlyImportError("AC3D: Invalid number of vertices");
                                    }
                                    *vertices = object.vertices[entry.first] + object.translation;


                                    // copy texture coordinates
                                    if (uv)
                                    {
                                        uv->x =  entry.second.x;
                                        uv->y =  entry.second.y;
                                        ++uv;
                                    }
                                }
                            }
                        }
                        else
                        {

                            it2  = (*it).entries.begin();

                            // either a closed or an unclosed line
                            unsigned int tmp = (unsigned int)(*it).entries.size();
                            if (0x2 == type)--tmp;
                            for (unsigned int m = 0; m < tmp;++m)
                            {
                                aiFace& face = *faces++;

                                face.mNumIndices = 2;
                                face.mIndices = new unsigned int[2];
                                face.mIndices[0] = cur++;
                                face.mIndices[1] = cur++;

                                // copy vertex positions
                                if (it2 == (*it).entries.end() ) {
                                    throw DeadlyImportError("AC3D: Bad line");
                                }
                                ai_assert((*it2).first < object.vertices.size());
                                *vertices++ = object.vertices[(*it2).first];

                                // copy texture coordinates
                                if (uv)
                                {
                                    uv->x =  (*it2).second.x;
                                    uv->y =  (*it2).second.y;
                                    ++uv;
                                }


                                if (0x1 == type && tmp-1 == m)
                                {
                                    // if this is a closed line repeat its beginning now
                                    it2  = (*it).entries.begin();
                                }
                                else ++it2;

                                // second point
                                *vertices++ = object.vertices[(*it2).first];

                                if (uv)
                                {
                                    uv->x =  (*it2).second.x;
                                    uv->y =  (*it2).second.y;
                                    ++uv;
                                }
                            }
                        }
                    }
                }
            }

            // Now apply catmull clark subdivision if necessary. We split meshes into
            // materials which is not done by AC3D during smoothing, so we need to
            // collect all meshes using the same material group.
            if (object.subDiv)  {
                if (configEvalSubdivision) {
                    std::unique_ptr<Subdivider> div(Subdivider::Create(Subdivider::CATMULL_CLARKE));
                    DefaultLogger::get()->info("AC3D: Evaluating subdivision surface: "+object.name);

                    std::vector<aiMesh*> cpy(meshes.size()-oldm,NULL);
                    div->Subdivide(&meshes[oldm],cpy.size(),&cpy.front(),object.subDiv,true);
                    std::copy(cpy.begin(),cpy.end(),meshes.begin()+oldm);

                    // previous meshes are deleted vy Subdivide().
                }
                else {
                    DefaultLogger::get()->info("AC3D: Letting the subdivision surface untouched due to my configuration: "
                        +object.name);
                }
            }
        }
    }

    if (object.name.length())
        node->mName.Set(object.name);
    else
    {
        // generate a name depending on the type of the node
        switch (object.type)
        {
        case Object::Group:
            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACGroup_%i",groups++);
            break;
        case Object::Poly:
            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACPoly_%i",polys++);
            break;
        case Object::Light:
            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACLight_%i",lights++);
            break;

            // there shouldn't be more than one world, but we don't care
        case Object::World:
            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACWorld_%i",worlds++);
            break;
        }
    }


    // setup the local transformation matrix of the object
    // compute the transformation offset to the parent node
    node->mTransformation = aiMatrix4x4 ( object.rotation );

    if (object.type == Object::Group || !object.numRefs)
    {
        node->mTransformation.a4 = object.translation.x;
        node->mTransformation.b4 = object.translation.y;
        node->mTransformation.c4 = object.translation.z;
    }

    // add children to the object
    if (object.children.size())
    {
        node->mNumChildren = (unsigned int)object.children.size();
        node->mChildren = new aiNode*[node->mNumChildren];
        for (unsigned int i = 0; i < node->mNumChildren;++i)
        {
            node->mChildren[i] = ConvertObjectSection(object.children[i],meshes,outMaterials,materials,node);
        }
    }

    return node;
}

// ------------------------------------------------------------------------------------------------
void AC3DImporter::SetupProperties(const Importer* pImp)
{
    configSplitBFCull = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_AC_SEPARATE_BFCULL,1) ? true : false;
    configEvalSubdivision =  pImp->GetPropertyInteger(AI_CONFIG_IMPORT_AC_EVAL_SUBDIVISION,1) ? true : false;
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void AC3DImporter::InternReadFile( const std::string& pFile,
    aiScene* pScene, IOSystem* pIOHandler)
{
    std::unique_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

    // Check whether we can read from the file
    if( file.get() == NULL)
        throw DeadlyImportError( "Failed to open AC3D file " + pFile + ".");

    // allocate storage and copy the contents of the file to a memory buffer
    std::vector<char> mBuffer2;
    TextFileToBuffer(file.get(),mBuffer2);

    buffer = &mBuffer2[0];
    mNumMeshes = 0;

    lights = polys = worlds = groups = 0;

    if (::strncmp(buffer,"AC3D",4)) {
        throw DeadlyImportError("AC3D: No valid AC3D file, magic sequence not found");
    }

    // print the file format version to the console
    unsigned int version = HexDigitToDecimal( buffer[4] );
    char msg[3];
    ASSIMP_itoa10(msg,3,version);
    DefaultLogger::get()->info(std::string("AC3D file format version: ") + msg);

    std::vector<Material> materials;
    materials.reserve(5);

    std::vector<Object> rootObjects;
    rootObjects.reserve(5);

    std::vector<aiLight*> lights;
    mLights = & lights;

    while (GetNextLine())
    {
        if (TokenMatch(buffer,"MATERIAL",8))
        {
            materials.push_back(Material());
            Material& mat = materials.back();

            // manually parse the material ... sscanf would use the buldin atof ...
            // Format: (name) rgb %f %f %f  amb %f %f %f  emis %f %f %f  spec %f %f %f  shi %d  trans %f

            AI_AC_SKIP_TO_NEXT_TOKEN();
            if ('\"' == *buffer)
            {
                AI_AC_GET_STRING(mat.name);
                AI_AC_SKIP_TO_NEXT_TOKEN();
            }

            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("rgb",3,3,&mat.rgb);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("amb",3,3,&mat.amb);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("emis",4,3,&mat.emis);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("spec",4,3,&mat.spec);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("shi",3,1,&mat.shin);
            AI_AC_CHECKED_LOAD_FLOAT_ARRAY("trans",5,1,&mat.trans);
        }
        LoadObjectSection(rootObjects);
    }

    if (rootObjects.empty() || !mNumMeshes)
    {
        throw DeadlyImportError("AC3D: No meshes have been loaded");
    }
    if (materials.empty())
    {
        DefaultLogger::get()->warn("AC3D: No material has been found");
        materials.push_back(Material());
    }

    mNumMeshes += (mNumMeshes>>2u) + 1;
    std::vector<aiMesh*> meshes;
    meshes.reserve(mNumMeshes);

    std::vector<aiMaterial*> omaterials;
    materials.reserve(mNumMeshes);

    // generate a dummy root if there are multiple objects on the top layer
    Object* root;
    if (1 == rootObjects.size())
        root = &rootObjects[0];
    else
    {
        root = new Object();
    }

    // now convert the imported stuff to our output data structure
    pScene->mRootNode = ConvertObjectSection(*root,meshes,omaterials,materials);
    if (1 != rootObjects.size())delete root;

    if (!::strncmp( pScene->mRootNode->mName.data, "Node", 4))
        pScene->mRootNode->mName.Set("<AC3DWorld>");

    // copy meshes
    if (meshes.empty())
    {
        throw DeadlyImportError("An unknown error occurred during converting");
    }
    pScene->mNumMeshes = (unsigned int)meshes.size();
    pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
    ::memcpy(pScene->mMeshes,&meshes[0],pScene->mNumMeshes*sizeof(void*));

    // copy materials
    pScene->mNumMaterials = (unsigned int)omaterials.size();
    pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
    ::memcpy(pScene->mMaterials,&omaterials[0],pScene->mNumMaterials*sizeof(void*));

    // copy lights
    pScene->mNumLights = (unsigned int)lights.size();
    if (lights.size())
    {
        pScene->mLights = new aiLight*[lights.size()];
        ::memcpy(pScene->mLights,&lights[0],lights.size()*sizeof(void*));
    }
}

#endif //!defined ASSIMP_BUILD_NO_AC_IMPORTER