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  following disclaimer.

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*/

/** @file Implementation of the XFile parser helper class */

#ifndef ASSIMP_BUILD_NO_X_IMPORTER

#include "XFileParser.h"

#include "XFileHelper.h"

#include <assimp/ByteSwapper.h>

#include <assimp/Exceptional.h>

#include <assimp/StringUtils.h>

#include <assimp/TinyFormatter.h>

#include <assimp/fast_atof.h>

#include <assimp/DefaultLogger.hpp>

using namespace Assimp;

using namespace Assimp::XFile;

using namespace Assimp::Formatter;

#ifndef ASSIMP_BUILD_NO_COMPRESSED_X

#include "Common/Compression.h"

// Magic identifier for MSZIP compressed data

constexpr unsigned int MSZIP_MAGIC = 0x4B43;

constexpr size_t MSZIP_BLOCK = 32786l;

#endif // !! ASSIMP_BUILD_NO_COMPRESSED_X

// ------------------------------------------------------------------------------------------------

// Throws an exception with a line number and the given text.

template<typename... T>

AI_WONT_RETURN void XFileParser::ThrowException(T&&... args) {

    if (mIsBinaryFormat) {

        throw DeadlyImportError(args...);

    } else {

        throw DeadlyImportError("Line ", mLineNumber, ": ", args...);

    }

}

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [28], char const&, char const&, char const&, char const&, char const (&) [2]>(char const (&) [28], char const&, char const&, char const&, char const&, char const (&) [2])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [20], unsigned int&, char const (&) [29]>(char const (&) [20], unsigned int&, char const (&) [29])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [65]>(char const (&) [65])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [51]>(char const (&) [51])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [52]>(char const (&) [52])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [37]>(char const (&) [37])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [48]>(char const (&) [48])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [19]>(char const (&) [19])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [47]>(char const (&) [47])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [33]>(char const (&) [33])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [57]>(char const (&) [57])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [60]>(char const (&) [60])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [56]>(char const (&) [56])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [18], unsigned int&, char const (&) [15]>(char const (&) [18], unsigned int&, char const (&) [15])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [54]>(char const (&) [54])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [24]>(char const (&) [24])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [20]>(char const (&) [20])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [43]>(char const (&) [43])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [44]>(char const (&) [44])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [25]>(char const (&) [25])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [62]>(char const (&) [62])

Unexecuted instantiation: void Assimp::XFileParser::ThrowException<char const (&) [17]>(char const (&) [17])

// ------------------------------------------------------------------------------------------------

// Constructor. Creates a data structure out of the XFile given in the memory block.

XFileParser::XFileParser(const std::vector<char> &pBuffer) :

        mMajorVersion(0), mMinorVersion(0), mIsBinaryFormat(false), mBinaryNumCount(0), mP(nullptr), mEnd(nullptr), mLineNumber(0), mScene(nullptr) {

    // vector to store uncompressed file for INFLATE'd X files

    std::vector<char> uncompressed;

    // set up memory pointers

    mP = &pBuffer.front();

    mEnd = mP + pBuffer.size() - 1;

    // check header

    if (0 != strncmp(mP, "xof ", 4)) {

        throw DeadlyImportError("Header mismatch, file is not an XFile.");

    }

    // read version. It comes in a four byte format such as "0302"

    mMajorVersion = (unsigned int)(mP[4] - 48) * 10 + (unsigned int)(mP[5] - 48);

    mMinorVersion = (unsigned int)(mP[6] - 48) * 10 + (unsigned int)(mP[7] - 48);

    bool compressed = false;

    // txt - pure ASCII text format

    if (strncmp(mP + 8, "txt ", 4) == 0)

        mIsBinaryFormat = false;

    // bin - Binary format

    else if (strncmp(mP + 8, "bin ", 4) == 0)

        mIsBinaryFormat = true;

    // tzip - Inflate compressed text format

    else if (strncmp(mP + 8, "tzip", 4) == 0) {

        mIsBinaryFormat = false;

        compressed = true;

    }

    // bzip - Inflate compressed binary format

    else if (strncmp(mP + 8, "bzip", 4) == 0) {

        mIsBinaryFormat = true;

        compressed = true;

    } else

        ThrowException("Unsupported x-file format '", mP[8], mP[9], mP[10], mP[11], "'");

    // float size

    mBinaryFloatSize = (unsigned int)(mP[12] - 48) * 1000 + (unsigned int)(mP[13] - 48) * 100 + (unsigned int)(mP[14] - 48) * 10 + (unsigned int)(mP[15] - 48);

    if (mBinaryFloatSize != 32 && mBinaryFloatSize != 64)

        ThrowException("Unknown float size ", mBinaryFloatSize, " specified in x-file header.");

    // The x format specifies size in bits, but we work in bytes

    mBinaryFloatSize /= 8;

    mP += 16;

    // If this is a compressed X file, apply the inflate algorithm to it

    if (compressed) {

#ifdef ASSIMP_BUILD_NO_COMPRESSED_X

        throw DeadlyImportError("Assimp was built without compressed X support");

#else

        /* ///////////////////////////////////////////////////////////////////////

         * COMPRESSED X FILE FORMAT

         * ///////////////////////////////////////////////////////////////////////

         *    [xhead]

         *    2 major

         *    2 minor

         *    4 type    // bzip,tzip

         *    [mszip_master_head]

         *    4 unkn    // checksum?

         *    2 unkn    // flags? (seems to be constant)

         *    [mszip_head]

         *    2 ofs     // offset to next section

         *    2 magic   // 'CK'

         *    ... ofs bytes of data

         *    ... next mszip_head

         *

         *  http://www.kdedevelopers.org/node/3181 has been very helpful.

         * ///////////////////////////////////////////////////////////////////////

         */

        // skip unknown data (checksum, flags?)

        mP += 6;

        // First find out how much storage we'll need. Count sections.

        const char *P1 = mP;

        unsigned int est_out = 0;

        while (P1 + 3 < mEnd) {

            // read next offset

            uint16_t ofs = *((uint16_t *)P1);

            AI_SWAP2(ofs);

            P1 += 2;

            if (ofs >= MSZIP_BLOCK)

                throw DeadlyImportError("X: Invalid offset to next MSZIP compressed block");

            // check magic word

            uint16_t magic = *((uint16_t *)P1);

            AI_SWAP2(magic);

            P1 += 2;

            if (magic != MSZIP_MAGIC)

                throw DeadlyImportError("X: Unsupported compressed format, expected MSZIP header");

            // and advance to the next offset

            P1 += ofs;

            est_out += MSZIP_BLOCK; // one decompressed block is 327861 in size

        }

        // Allocate storage and terminating zero and do the actual uncompressing

        Compression compression;

        uncompressed.resize(est_out + 1);

        char *out = &uncompressed.front();

        if (compression.open(mIsBinaryFormat ? Compression::Format::Binary : Compression::Format::ASCII,

                Compression::FlushMode::SyncFlush, -Compression::MaxWBits)) {

            while (mP + 3 < mEnd) {

                uint16_t ofs = *((uint16_t *)mP);

                AI_SWAP2(ofs);

                mP += 4;

                if (mP + ofs > mEnd + 2) {

                    throw DeadlyImportError("X: Unexpected EOF in compressed chunk");

                }

                out += compression.decompressBlock(mP, ofs, out, MSZIP_BLOCK);

                mP += ofs;

            }

            compression.close();

        }

        // ok, update pointers to point to the uncompressed file data

        mP = &uncompressed[0];

        mEnd = out;

        // FIXME: we don't need the compressed data anymore, could release

        // it already for better memory usage. Consider breaking const-co.

        ASSIMP_LOG_INFO("Successfully decompressed MSZIP-compressed file");

#endif // !! ASSIMP_BUILD_NO_COMPRESSED_X

    } else {

        // start reading here

        ReadUntilEndOfLine();

    }

    mScene = new Scene;

    ParseFile();

    // filter the imported hierarchy for some degenerated cases

    if (mScene->mRootNode) {

        FilterHierarchy(mScene->mRootNode);

    }

}

// ------------------------------------------------------------------------------------------------

// Destructor. Destroys all imported data along with it

XFileParser::~XFileParser() {

    // kill everything we created

    delete mScene;

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseFile() {

    bool running = true;

    while (running) {

        // read name of next object

        std::string objectName = GetNextToken();

        if (objectName.length() == 0) {

            break;

        }

        // parse specific object

        if (objectName == "template") {

            ParseDataObjectTemplate();

        } else if (objectName == "Frame") {

            ParseDataObjectFrame(nullptr);

        } else if (objectName == "Mesh") {

            // some meshes have no frames at all

            Mesh *mesh = new Mesh;

            ParseDataObjectMesh(mesh);

            mScene->mGlobalMeshes.push_back(mesh);

        } else if (objectName == "AnimTicksPerSecond")

            ParseDataObjectAnimTicksPerSecond();

        else if (objectName == "AnimationSet")

            ParseDataObjectAnimationSet();

        else if (objectName == "Material") {

            // Material outside of a mesh or node

            Material material;

            ParseDataObjectMaterial(&material);

            mScene->mGlobalMaterials.push_back(material);

        } else if (objectName == "}") {

            // whatever?

            ASSIMP_LOG_WARN("} found in dataObject");

        } else {

            // unknown format

            ASSIMP_LOG_WARN("Unknown data object in animation of .x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectTemplate() {

    // parse a template data object. Currently not stored.

    std::string name;

    readHeadOfDataObject(&name);

    // read GUID

    std::string guid = GetNextToken();

    // read and ignore data members

    bool running = true;

    while (running) {

        std::string s = GetNextToken();

        if (s == "}") {

            break;

        }

        if (s.length() == 0) {

            ThrowException("Unexpected end of file reached while parsing template definition");

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectFrame(Node *pParent) {

    // A coordinate frame, or "frame of reference." The Frame template

    // is open and can contain any object. The Direct3D extensions (D3DX)

    // mesh-loading functions recognize Mesh, FrameTransformMatrix, and

    // Frame template instances as child objects when loading a Frame

    // instance.

    std::string name;

    readHeadOfDataObject(&name);

    // create a named node and place it at its parent, if given

    Node *node = new Node(pParent);

    node->mName = name;

    if (pParent) {

        pParent->mChildren.push_back(node);

    } else {

        // there might be multiple root nodes

        if (mScene->mRootNode != nullptr) {

            // place a dummy root if not there

            if (mScene->mRootNode->mName != "$dummy_root") {

                Node *exroot = mScene->mRootNode;

                mScene->mRootNode = new Node(nullptr);

                mScene->mRootNode->mName = "$dummy_root";

                mScene->mRootNode->mChildren.push_back(exroot);

                exroot->mParent = mScene->mRootNode;

            }

            // put the new node as its child instead

            mScene->mRootNode->mChildren.push_back(node);

            node->mParent = mScene->mRootNode;

        } else {

            // it's the first node imported. place it as root

            mScene->mRootNode = node;

        }

    }

    // Now inside a frame.

    // read tokens until closing brace is reached.

    bool running = true;

    while (running) {

        std::string objectName = GetNextToken();

        if (objectName.size() == 0)

            ThrowException("Unexpected end of file reached while parsing frame");

        if (objectName == "}")

            break; // frame finished

        else if (objectName == "Frame")

            ParseDataObjectFrame(node); // child frame

        else if (objectName == "FrameTransformMatrix")

            ParseDataObjectTransformationMatrix(node->mTrafoMatrix);

        else if (objectName == "Mesh") {

            Mesh *mesh = new Mesh(name);

            node->mMeshes.push_back(mesh);

            ParseDataObjectMesh(mesh);

        } else {

            ASSIMP_LOG_WARN("Unknown data object in frame in x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectTransformationMatrix(aiMatrix4x4 &pMatrix) {

    // read header, we're not interested if it has a name

    readHeadOfDataObject();

    // read its components

    pMatrix.a1 = ReadFloat();

    pMatrix.b1 = ReadFloat();

    pMatrix.c1 = ReadFloat();

    pMatrix.d1 = ReadFloat();

    pMatrix.a2 = ReadFloat();

    pMatrix.b2 = ReadFloat();

    pMatrix.c2 = ReadFloat();

    pMatrix.d2 = ReadFloat();

    pMatrix.a3 = ReadFloat();

    pMatrix.b3 = ReadFloat();

    pMatrix.c3 = ReadFloat();

    pMatrix.d3 = ReadFloat();

    pMatrix.a4 = ReadFloat();

    pMatrix.b4 = ReadFloat();

    pMatrix.c4 = ReadFloat();

    pMatrix.d4 = ReadFloat();

    // trailing symbols

    CheckForSemicolon();

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectMesh(Mesh *pMesh) {

    std::string name;

    readHeadOfDataObject(&name);

    // read vertex count

    unsigned int numVertices = ReadInt();

    pMesh->mPositions.resize(numVertices);

    // read vertices

    for (unsigned int a = 0; a < numVertices; a++)

        pMesh->mPositions[a] = ReadVector3();

    // read position faces

    unsigned int numPosFaces = ReadInt();

    pMesh->mPosFaces.resize(numPosFaces);

    for (unsigned int a = 0; a < numPosFaces; ++a) {

        // read indices

        unsigned int numIndices = ReadInt();

        Face &face = pMesh->mPosFaces[a];

        for (unsigned int b = 0; b < numIndices; ++b) {

            const int idx(ReadInt());

            if (static_cast<unsigned int>(idx) <= numVertices) {

                face.mIndices.push_back(idx);

            }

        }

        TestForSeparator();

    }

    // here, other data objects may follow

    bool running = true;

    while (running) {

        std::string objectName = GetNextToken();

        if (objectName.empty())

            ThrowException("Unexpected end of file while parsing mesh structure");

        else if (objectName == "}")

            break; // mesh finished

        else if (objectName == "MeshNormals")

            ParseDataObjectMeshNormals(pMesh);

        else if (objectName == "MeshTextureCoords")

            ParseDataObjectMeshTextureCoords(pMesh);

        else if (objectName == "MeshVertexColors")

            ParseDataObjectMeshVertexColors(pMesh);

        else if (objectName == "MeshMaterialList")

            ParseDataObjectMeshMaterialList(pMesh);

        else if (objectName == "VertexDuplicationIndices")

            ParseUnknownDataObject(); // we'll ignore vertex duplication indices

        else if (objectName == "XSkinMeshHeader")

            ParseDataObjectSkinMeshHeader(pMesh);

        else if (objectName == "SkinWeights")

            ParseDataObjectSkinWeights(pMesh);

        else {

            ASSIMP_LOG_WARN("Unknown data object in mesh in x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectSkinWeights(Mesh *pMesh) {

    if (nullptr == pMesh) {

        return;

    }

    readHeadOfDataObject();

    std::string transformNodeName;

    GetNextTokenAsString(transformNodeName);

    pMesh->mBones.emplace_back();

    Bone &bone = pMesh->mBones.back();

    bone.mName = transformNodeName;

    // read vertex weights

    unsigned int numWeights = ReadInt();

    bone.mWeights.reserve(numWeights);

    for (unsigned int a = 0; a < numWeights; a++) {

        BoneWeight weight = {};

        weight.mVertex = ReadInt();

        bone.mWeights.push_back(weight);

    }

    // read vertex weights

    for (unsigned int a = 0; a < numWeights; a++)

        bone.mWeights[a].mWeight = ReadFloat();

    // read matrix offset

    bone.mOffsetMatrix.a1 = ReadFloat();

    bone.mOffsetMatrix.b1 = ReadFloat();

    bone.mOffsetMatrix.c1 = ReadFloat();

    bone.mOffsetMatrix.d1 = ReadFloat();

    bone.mOffsetMatrix.a2 = ReadFloat();

    bone.mOffsetMatrix.b2 = ReadFloat();

    bone.mOffsetMatrix.c2 = ReadFloat();

    bone.mOffsetMatrix.d2 = ReadFloat();

    bone.mOffsetMatrix.a3 = ReadFloat();

    bone.mOffsetMatrix.b3 = ReadFloat();

    bone.mOffsetMatrix.c3 = ReadFloat();

    bone.mOffsetMatrix.d3 = ReadFloat();

    bone.mOffsetMatrix.a4 = ReadFloat();

    bone.mOffsetMatrix.b4 = ReadFloat();

    bone.mOffsetMatrix.c4 = ReadFloat();

    bone.mOffsetMatrix.d4 = ReadFloat();

    CheckForSemicolon();

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectSkinMeshHeader(Mesh * /*pMesh*/) {

    readHeadOfDataObject();

    /*unsigned int maxSkinWeightsPerVertex =*/ReadInt();

    /*unsigned int maxSkinWeightsPerFace =*/ReadInt();

    /*unsigned int numBonesInMesh = */ ReadInt();

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectMeshNormals(Mesh *pMesh) {

    readHeadOfDataObject();

    // read count

    unsigned int numNormals = ReadInt();

    pMesh->mNormals.resize(numNormals);

    // read normal vectors

    for (unsigned int a = 0; a < numNormals; ++a) {

        pMesh->mNormals[a] = ReadVector3();

    }

    // read normal indices

    unsigned int numFaces = ReadInt();

    if (numFaces != pMesh->mPosFaces.size()) {

        ThrowException("Normal face count does not match vertex face count.");

    }

    // do not crah when no face definitions are there

    if (numFaces > 0) {

        // normal face creation

        pMesh->mNormFaces.resize(numFaces);

        for (unsigned int a = 0; a < numFaces; ++a) {

            unsigned int numIndices = ReadInt();

            pMesh->mNormFaces[a] = Face();

            Face &face = pMesh->mNormFaces[a];

            for (unsigned int b = 0; b < numIndices; ++b) {

                face.mIndices.push_back(ReadInt());

            }

            TestForSeparator();

        }

    }

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectMeshTextureCoords(Mesh *pMesh) {

    readHeadOfDataObject();

    if (pMesh->mNumTextures + 1 > AI_MAX_NUMBER_OF_TEXTURECOORDS)

        ThrowException("Too many sets of texture coordinates");

    std::vector<aiVector2D> &coords = pMesh->mTexCoords[pMesh->mNumTextures++];

    unsigned int numCoords = ReadInt();

    if (numCoords != pMesh->mPositions.size())

        ThrowException("Texture coord count does not match vertex count");

    coords.resize(numCoords);

    for (unsigned int a = 0; a < numCoords; a++)

        coords[a] = ReadVector2();

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectMeshVertexColors(Mesh *pMesh) {

    readHeadOfDataObject();

    if (pMesh->mNumColorSets + 1 > AI_MAX_NUMBER_OF_COLOR_SETS)

        ThrowException("Too many colorsets");

    std::vector<aiColor4D> &colors = pMesh->mColors[pMesh->mNumColorSets++];

    unsigned int numColors = ReadInt();

    if (numColors != pMesh->mPositions.size())

        ThrowException("Vertex color count does not match vertex count");

    colors.resize(numColors, aiColor4D(0, 0, 0, 1));

    for (unsigned int a = 0; a < numColors; a++) {

        unsigned int index = ReadInt();

        if (index >= pMesh->mPositions.size())

            ThrowException("Vertex color index out of bounds");

        colors[index] = ReadRGBA();

        // HACK: (thom) Maxon Cinema XPort plugin puts a third separator here, kwxPort puts a comma.

        // Ignore gracefully.

        if (!mIsBinaryFormat) {

            FindNextNoneWhiteSpace();

            if (*mP == ';' || *mP == ',')

                mP++;

        }

    }

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectMeshMaterialList(Mesh *pMesh) {

    readHeadOfDataObject();

    // read material count

    /*unsigned int numMaterials =*/ReadInt();

    // read non triangulated face material index count

    unsigned int numMatIndices = ReadInt();

    // some models have a material index count of 1... to be able to read them we

    // replicate this single material index on every face

    if (numMatIndices != pMesh->mPosFaces.size() && numMatIndices != 1)

        ThrowException("Per-Face material index count does not match face count.");

    // read per-face material indices

    for (unsigned int a = 0; a < numMatIndices; a++)

        pMesh->mFaceMaterials.push_back(ReadInt());

    // in version 03.02, the face indices end with two semicolons.

    // commented out version check, as version 03.03 exported from blender also has 2 semicolons

    if (!mIsBinaryFormat) // && MajorVersion == 3 && MinorVersion <= 2)

    {

        if (mP < mEnd && *mP == ';')

            ++mP;

    }

    // if there was only a single material index, replicate it on all faces

    while (pMesh->mFaceMaterials.size() < pMesh->mPosFaces.size())

        pMesh->mFaceMaterials.push_back(pMesh->mFaceMaterials.front());

    // read following data objects

    bool running = true;

    while (running) {

        std::string objectName = GetNextToken();

        if (objectName.size() == 0)

            ThrowException("Unexpected end of file while parsing mesh material list.");

        else if (objectName == "}")

            break; // material list finished

        else if (objectName == "{") {

            // template materials

            std::string matName = GetNextToken();

            Material material;

            material.mIsReference = true;

            material.mName = matName;

            pMesh->mMaterials.push_back(material);

            CheckForClosingBrace(); // skip }

        } else if (objectName == "Material") {

            pMesh->mMaterials.emplace_back();

            ParseDataObjectMaterial(&pMesh->mMaterials.back());

        } else if (objectName == ";") {

            // ignore

        } else {

            ASSIMP_LOG_WARN("Unknown data object in material list in x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectMaterial(Material *pMaterial) {

    std::string matName;

    readHeadOfDataObject(&matName);

    if (matName.empty())

        matName = std::string("material") + ai_to_string(mLineNumber);

    pMaterial->mName = matName;

    pMaterial->mIsReference = false;

    // read material values

    pMaterial->mDiffuse = ReadRGBA();

    pMaterial->mSpecularExponent = ReadFloat();

    pMaterial->mSpecular = ReadRGB();

    pMaterial->mEmissive = ReadRGB();

    // read other data objects

    bool running = true;

    while (running) {

        std::string objectName = GetNextToken();

        if (objectName.size() == 0)

            ThrowException("Unexpected end of file while parsing mesh material");

        else if (objectName == "}")

            break; // material finished

        else if (objectName == "TextureFilename" || objectName == "TextureFileName") {

            // some exporters write "TextureFileName" instead.

            std::string texname;

            ParseDataObjectTextureFilename(texname);

            pMaterial->mTextures.emplace_back(texname);

        } else if (objectName == "NormalmapFilename" || objectName == "NormalmapFileName") {

            // one exporter writes out the normal map in a separate filename tag

            std::string texname;

            ParseDataObjectTextureFilename(texname);

            pMaterial->mTextures.emplace_back(texname, true);

        } else {

            ASSIMP_LOG_WARN("Unknown data object in material in x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectAnimTicksPerSecond() {

    readHeadOfDataObject();

    mScene->mAnimTicksPerSecond = ReadInt();

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectAnimationSet() {

    std::string animName;

    readHeadOfDataObject(&animName);

    Animation *anim = new Animation;

    mScene->mAnims.push_back(anim);

    anim->mName = animName;

    bool running = true;

    while (running) {

        std::string objectName = GetNextToken();

        if (objectName.length() == 0)

            ThrowException("Unexpected end of file while parsing animation set.");

        else if (objectName == "}")

            break; // animation set finished

        else if (objectName == "Animation")

            ParseDataObjectAnimation(anim);

        else {

            ASSIMP_LOG_WARN("Unknown data object in animation set in x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectAnimation(Animation *pAnim) {

    readHeadOfDataObject();

    AnimBone *banim = new AnimBone;

    pAnim->mAnims.push_back(banim);

    bool running = true;

    while (running) {

        std::string objectName = GetNextToken();

        if (objectName.length() == 0)

            ThrowException("Unexpected end of file while parsing animation.");

        else if (objectName == "}")

            break; // animation finished

        else if (objectName == "AnimationKey")

            ParseDataObjectAnimationKey(banim);

        else if (objectName == "AnimationOptions")

            ParseUnknownDataObject(); // not interested

        else if (objectName == "{") {

            // read frame name

            banim->mBoneName = GetNextToken();

            CheckForClosingBrace();

        } else {

            ASSIMP_LOG_WARN("Unknown data object in animation in x file");

            ParseUnknownDataObject();

        }

    }

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectAnimationKey(AnimBone *pAnimBone) {

    readHeadOfDataObject();

    // read key type

    unsigned int keyType = ReadInt();

    // read number of keys

    unsigned int numKeys = ReadInt();

    for (unsigned int a = 0; a < numKeys; a++) {

        // read time

        unsigned int time = ReadInt();

        // read keys

        switch (keyType) {

        case 0: // rotation quaternion

        {

            // read count

            if (ReadInt() != 4)

                ThrowException("Invalid number of arguments for quaternion key in animation");

            aiQuatKey key;

            key.mTime = double(time);

            key.mValue.w = ReadFloat();

            key.mValue.x = ReadFloat();

            key.mValue.y = ReadFloat();

            key.mValue.z = ReadFloat();

            pAnimBone->mRotKeys.push_back(key);

            CheckForSemicolon();

            break;

        }

        case 1: // scale vector

        case 2: // position vector

        {

            // read count

            if (ReadInt() != 3)

                ThrowException("Invalid number of arguments for vector key in animation");

            aiVectorKey key;

            key.mTime = double(time);

            key.mValue = ReadVector3();

            if (keyType == 2)

                pAnimBone->mPosKeys.push_back(key);

            else

                pAnimBone->mScaleKeys.push_back(key);

            break;

        }

        case 3: // combined transformation matrix

        case 4: // denoted both as 3 or as 4

        {

            // read count

            if (ReadInt() != 16)

                ThrowException("Invalid number of arguments for matrix key in animation");

            // read matrix

            MatrixKey key;

            key.mTime = double(time);

            key.mMatrix.a1 = ReadFloat();

            key.mMatrix.b1 = ReadFloat();

            key.mMatrix.c1 = ReadFloat();

            key.mMatrix.d1 = ReadFloat();

            key.mMatrix.a2 = ReadFloat();

            key.mMatrix.b2 = ReadFloat();

            key.mMatrix.c2 = ReadFloat();

            key.mMatrix.d2 = ReadFloat();

            key.mMatrix.a3 = ReadFloat();

            key.mMatrix.b3 = ReadFloat();

            key.mMatrix.c3 = ReadFloat();

            key.mMatrix.d3 = ReadFloat();

            key.mMatrix.a4 = ReadFloat();

            key.mMatrix.b4 = ReadFloat();

            key.mMatrix.c4 = ReadFloat();

            key.mMatrix.d4 = ReadFloat();

            pAnimBone->mTrafoKeys.push_back(key);

            CheckForSemicolon();

            break;

        }

        default:

            ThrowException("Unknown key type ", keyType, " in animation.");

        } // end switch

        // key separator

        CheckForSeparator();

    }

    CheckForClosingBrace();

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseDataObjectTextureFilename(std::string &pName) {

    readHeadOfDataObject();

    GetNextTokenAsString(pName);

    CheckForClosingBrace();

    // FIX: some files (e.g. AnimationTest.x) have "" as texture file name

    if (!pName.length()) {

        ASSIMP_LOG_WARN("Length of texture file name is zero. Skipping this texture.");

    }

    // some exporters write double backslash paths out. We simply replace them if we find them

    while (pName.find("\\\\") != std::string::npos)

        pName.replace(pName.find("\\\\"), 2, "\\");

}

// ------------------------------------------------------------------------------------------------

void XFileParser::ParseUnknownDataObject() {

    // find opening delimiter

    bool running = true;

    while (running) {

        std::string t = GetNextToken();

        if (t.length() == 0)

            ThrowException("Unexpected end of file while parsing unknown segment.");

        if (t == "{")

            break;

    }

    unsigned int counter = 1;

    // parse until closing delimiter

    while (counter > 0) {