Method InternReadFile

code/AssetLib/M3D/M3DImporter.cpp:136–201

------------------------------------------------------------------------------------------------ Model 3D import implementation

// ------------------------------------------------------------------------------------------------
//  Model 3D import implementation
void M3DImporter::InternReadFile(const std::string &file, aiScene *pScene, IOSystem *pIOHandler) {
    // Read file into memory
    std::unique_ptr<IOStream> pStream(pIOHandler->Open(file, "rb"));
    if (!pStream.get()) {
        throw DeadlyImportError("Failed to open file ", file, ".");
    }

    // Get the file-size and validate it, throwing an exception when fails
    size_t fileSize = pStream->FileSize();
    if (fileSize < 8) {
        throw DeadlyImportError("M3D-file ", file, " is too small.");
    }
    std::vector<unsigned char> buffer(fileSize);
    if (fileSize != pStream->Read(buffer.data(), 1, fileSize)) {
        throw DeadlyImportError("Failed to read the file ", file, ".");
    }
    // extra check for binary format's first 8 bytes. Not done for the ASCII variant
    if (!memcmp(buffer.data(), "3DMO", 4) && memcmp(buffer.data() + 4, &fileSize, 4)) {
        throw DeadlyImportError("Bad binary header in file ", file, ".");
    }
    // make sure there's a terminator zero character, as input must be ASCIIZ
    if (!memcmp(buffer.data(), "3dmo", 4)) {
        buffer.push_back(0);
    }

    // Get the path for external assets
    std::string folderName("./");
    std::string::size_type pos = file.find_last_of("\\/");
    if (pos != std::string::npos) {
        folderName = file.substr(0, pos);
        if (!folderName.empty()) {
            pIOHandler->PushDirectory(folderName);
        }
    }

    //DefaultLogger::create("/dev/stderr", Logger::VERBOSE);
    ASSIMP_LOG_DEBUG("M3D: loading ", file);

    // let the C SDK do the hard work for us
    M3DWrapper m3d(pIOHandler, buffer);

    if (!m3d) {
        throw DeadlyImportError("Unable to parse ", file, " as M3D.");
    }

    // create the root node
    pScene->mRootNode = new aiNode;
    pScene->mRootNode->mName = aiString(m3d.Name());
    pScene->mRootNode->mTransformation = aiMatrix4x4();
    pScene->mRootNode->mNumChildren = 0;
    mScene = pScene;

    ASSIMP_LOG_DEBUG("M3D: root node ", m3d.Name());

    // now we just have to fill up the Assimp structures in pScene
    importMaterials(m3d);
    importTextures(m3d);
    importBones(m3d, M3D_NOTDEFINED, pScene->mRootNode);