Method InternReadFile

code/AssetLib/XGL/XGLLoader.cpp:96–167

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// ------------------------------------------------------------------------------------------------
void XGLImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
    clear();
#ifndef ASSIMP_BUILD_NO_COMPRESSED_XGL
	std::vector<char> uncompressed;
#endif

	m_scene = pScene;
	std::shared_ptr<IOStream> stream(pIOHandler->Open(pFile, "rb"));

	// check whether we can read from the file
    if (stream == nullptr) {
        throw DeadlyImportError("Failed to open XGL/ZGL file " + pFile);
    }

    // see if its compressed, if so uncompress it
	if (GetExtension(pFile) == "zgl") {
#ifdef ASSIMP_BUILD_NO_COMPRESSED_XGL
		ThrowException("Cannot read ZGL file since Assimp was built without compression support");
#else
		std::unique_ptr<StreamReaderLE> raw_reader(new StreamReaderLE(stream));

        Compression compression;
        size_t total = 0l;
        if (compression.open(Compression::Format::Binary, Compression::FlushMode::NoFlush, -Compression::MaxWBits)) {
            // skip two extra bytes, zgl files do carry a crc16 upfront (I think)
            raw_reader->IncPtr(2);
            total = compression.decompress((unsigned char *)raw_reader->GetPtr(), raw_reader->GetRemainingSize(), uncompressed);
            compression.close();
        }
		// replace the input stream with a memory stream
        stream = std::make_shared<MemoryIOStream>(reinterpret_cast<uint8_t *>(uncompressed.data()), total);
#endif
	}

	// parse the XML file
    mXmlParser = new XmlParser;
    if (!mXmlParser->parse(stream.get())) {
        throw DeadlyImportError("XML parse error while loading XGL file ", pFile);
	}

	TempScope scope;
    XmlNode *worldNode = mXmlParser->findNode("WORLD");
    if (nullptr != worldNode) {
		ReadWorld(*worldNode, scope);
	}

	std::vector<aiMesh *> &meshes = scope.meshes_linear;
	std::vector<aiMaterial *> &materials = scope.materials_linear;
	if (meshes.empty() || materials.empty()) {
		ThrowException("failed to extract data from XGL file, no meshes loaded");
	}

	// copy meshes
	m_scene->mNumMeshes = static_cast<unsigned int>(meshes.size());
	m_scene->mMeshes = new aiMesh *[m_scene->mNumMeshes]();
	std::copy(meshes.begin(), meshes.end(), m_scene->mMeshes);

	// copy materials