code: /*************************************************************************/
  /*  FBXMaterial.cpp                                                      */
  /*************************************************************************/
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  /*
  Open Asset Import Library (assimp)
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  with or without modification, are permitted provided that the
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    copyright notice, this list of conditions and the
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  /** @file  FBXMaterial.cpp
   *  @brief Assimp::FBX::Material and Assimp::FBX::Texture implementation
   */
  
  #include "ByteSwapper.h"
  #include "FBXDocument.h"
  #include "FBXDocumentUtil.h"
  #include "FBXImportSettings.h"
  #include "FBXParser.h"
  #include "FBXProperties.h"
  
  #include "FBXUtil.h"
  #include <algorithm> // std::transform
  
  namespace FBXDocParser {
  
  using namespace Util;
  
  // ------------------------------------------------------------------------------------------------
  Material::Material(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
  		Object(id, element, name) {
  	const ScopePtr sc = GetRequiredScope(element);
  
  	const ElementPtr ShadingModel = sc->GetElement("ShadingModel");
  	const ElementPtr MultiLayer = sc->GetElement("MultiLayer");
  
  	if (MultiLayer) {
  		multilayer = !!ParseTokenAsInt(GetRequiredToken(MultiLayer, 0));
  	}
  
  	if (ShadingModel) {
  		shading = ParseTokenAsString(GetRequiredToken(ShadingModel, 0));
  	} else {
  		DOMWarning("shading mode not specified, assuming phong", element);
  		shading = "phong";
  	}
  
  	std::string templateName;
  
  	if (shading == "phong") {
  		templateName = "Material.Phong";
  	} else if (shading == "lambert") {
  		templateName = "Material.Lambert";
  	} else if (shading == "unknown") {
  		templateName = "Material.StingRay";
  	} else {
  		DOMWarning("shading mode not recognized: " + shading, element);
  	}
  
  	props = GetPropertyTable(doc, templateName, element, sc);
  
  	// resolve texture links
  	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID());
  	for (const Connection *con : conns) {
  		// texture link to properties, not objects
  		if (!con->PropertyName().length()) {
  			continue;
  		}
  
  		Object *ob = con->SourceObject();
  		if (!ob) {
  			DOMWarning("failed to read source object for texture link, ignoring", element);
  			continue;
  		}
  
  		const Texture *tex = dynamic_cast<const Texture *>(ob);
  		if (!tex) {
  			LayeredTexture *layeredTexture = dynamic_cast<LayeredTexture *>(ob);
  
  			if (!layeredTexture) {
  				DOMWarning("source object for texture link is not a texture or layered texture, ignoring", element);
  				continue;
  			}
  
  			const std::string &prop = con->PropertyName();
  			if (layeredTextures.find(prop) != layeredTextures.end()) {
  				DOMWarning("duplicate layered texture link: " + prop, element);
  			}
  
  			layeredTextures[prop] = layeredTexture;
  			layeredTexture->fillTexture(doc);
  		} else {
  			const std::string &prop = con->PropertyName();
  			if (textures.find(prop) != textures.end()) {
  				DOMWarning("duplicate texture link: " + prop, element);
  			}
  
  			textures[prop] = tex;
  		}
  	}
  }
  
  // ------------------------------------------------------------------------------------------------
  Material::~Material() {
  	if (props != nullptr) {
  		delete props;
  		props = nullptr;
  	}
  }
  
  // ------------------------------------------------------------------------------------------------
  Texture::Texture(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
  		Object(id, element, name), uvScaling(1.0f, 1.0f), media(nullptr) {
  	const ScopePtr sc = GetRequiredScope(element);
  
  	const ElementPtr Type = sc->GetElement("Type");
  	const ElementPtr FileName = sc->GetElement("FileName");
  	const ElementPtr RelativeFilename = sc->GetElement("RelativeFilename");
  	const ElementPtr ModelUVTranslation = sc->GetElement("ModelUVTranslation");
  	const ElementPtr ModelUVScaling = sc->GetElement("ModelUVScaling");
  	const ElementPtr Texture_Alpha_Source = sc->GetElement("Texture_Alpha_Source");
  	const ElementPtr Cropping = sc->GetElement("Cropping");
  
  	if (Type) {
  		type = ParseTokenAsString(GetRequiredToken(Type, 0));
  	}
  
  	if (FileName) {
  		fileName = ParseTokenAsString(GetRequiredToken(FileName, 0));
  	}
  
  	if (RelativeFilename) {
  		relativeFileName = ParseTokenAsString(GetRequiredToken(RelativeFilename, 0));
  	}
  
  	if (ModelUVTranslation) {
  		uvTrans = Vector2(ParseTokenAsFloat(GetRequiredToken(ModelUVTranslation, 0)),
  				ParseTokenAsFloat(GetRequiredToken(ModelUVTranslation, 1)));
  	}
  
  	if (ModelUVScaling) {
  		uvScaling = Vector2(ParseTokenAsFloat(GetRequiredToken(ModelUVScaling, 0)),
  				ParseTokenAsFloat(GetRequiredToken(ModelUVScaling, 1)));
  	}
  
  	if (Cropping) {
  		crop[0] = ParseTokenAsInt(GetRequiredToken(Cropping, 0));
  		crop[1] = ParseTokenAsInt(GetRequiredToken(Cropping, 1));
  		crop[2] = ParseTokenAsInt(GetRequiredToken(Cropping, 2));
  		crop[3] = ParseTokenAsInt(GetRequiredToken(Cropping, 3));
  	} else {
  		// vc8 doesn't support the crop() syntax in initialization lists
  		// (and vc9 WARNS about the new (i.e. compliant) behaviour).
  		crop[0] = crop[1] = crop[2] = crop[3] = 0;
  	}
  
  	if (Texture_Alpha_Source) {
  		alphaSource = ParseTokenAsString(GetRequiredToken(Texture_Alpha_Source, 0));
  	}
  
  	props = GetPropertyTable(doc, "Texture.FbxFileTexture", element, sc);
  
  	// 3DS Max and FBX SDK use "Scaling" and "Translation" instead of "ModelUVScaling" and "ModelUVTranslation". Use these properties if available.
  	bool ok;
  	const Vector3 &scaling = PropertyGet<Vector3>(props, "Scaling", ok);
  	if (ok) {
  		uvScaling.x = scaling.x;
  		uvScaling.y = scaling.y;
  	}
  
  	const Vector3 &trans = PropertyGet<Vector3>(props, "Translation", ok);
  	if (ok) {
  		uvTrans.x = trans.x;
  		uvTrans.y = trans.y;
  	}
  
  	// resolve video links
  	if (doc.Settings().readTextures) {
  		const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID());
  		for (const Connection *con : conns) {
  			const Object *const ob = con->SourceObject();
  			if (!ob) {
  				DOMWarning("failed to read source object for texture link, ignoring", element);
  				continue;
  			}
  
  			const Video *const video = dynamic_cast<const Video *>(ob);
  			if (video) {
  				media = video;
  			}
  		}
  	}
  }
  
  Texture::~Texture() {
  	if (props != nullptr) {
  		delete props;
  		props = nullptr;
  	}
  }
  
  LayeredTexture::LayeredTexture(uint64_t id, const ElementPtr element, const Document & /*doc*/, const std::string &name) :
  		Object(id, element, name), blendMode(BlendMode_Modulate), alpha(1) {
  	const ScopePtr sc = GetRequiredScope(element);
  
  	ElementPtr BlendModes = sc->GetElement("BlendModes");
  	ElementPtr Alphas = sc->GetElement("Alphas");
  
  	if (BlendModes != 0) {
  		blendMode = (BlendMode)ParseTokenAsInt(GetRequiredToken(BlendModes, 0));
  	}
  	if (Alphas != 0) {
  		alpha = ParseTokenAsFloat(GetRequiredToken(Alphas, 0));
  	}
  }
  
  LayeredTexture::~LayeredTexture() {
  }
  
  void LayeredTexture::fillTexture(const Document &doc) {
  	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID());
  	for (size_t i = 0; i < conns.size(); ++i) {
  		const Connection *con = conns.at(i);
  
  		const Object *const ob = con->SourceObject();
  		if (!ob) {
  			DOMWarning("failed to read source object for texture link, ignoring", element);
  			continue;
  		}
  
  		const Texture *const tex = dynamic_cast<const Texture *>(ob);
  
  		textures.push_back(tex);
  	}
  }
  
  // ------------------------------------------------------------------------------------------------
  Video::Video(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
  		Object(id, element, name), contentLength(0), content(0) {
  	const ScopePtr sc = GetRequiredScope(element);
  
  	const ElementPtr Type = sc->GetElement("Type");
  	// File Version 7500 Crashes if this is not checked fully.
  	// As of writing this comment 7700 exists, in August 2020
  	ElementPtr FileName = nullptr;
  	if (HasElement(sc, "Filename")) {
  		FileName = (ElementPtr)sc->GetElement("Filename");
  	} else if (HasElement(sc, "FileName")) {
  		FileName = (ElementPtr)sc->GetElement("FileName");
  	} else {
  		print_error("file has invalid video material returning...");
  		return;
  	}
  	const ElementPtr RelativeFilename = sc->GetElement("RelativeFilename");
  	const ElementPtr Content = sc->GetElement("Content");
  
  	if (Type) {
  		type = ParseTokenAsString(GetRequiredToken(Type, 0));
  	}
  
  	if (FileName) {
  		fileName = ParseTokenAsString(GetRequiredToken(FileName, 0));
  	}
  
  	if (RelativeFilename) {
  		relativeFileName = ParseTokenAsString(GetRequiredToken(RelativeFilename, 0));
  	}
  
  	if (Content && !Content->Tokens().empty()) {
  		//this field is omitted when the embedded texture is already loaded, let's ignore if it's not found
  		try {
  			const Token *token = GetRequiredToken(Content, 0);
  			const char *data = token->begin();
  			if (!token->IsBinary()) {
  				if (*data != '"') {
  					DOMError("embedded content is not surrounded by quotation marks", element);
  				} else {
  					size_t targetLength = 0;
  					auto numTokens = Content->Tokens().size();
  					// First time compute size (it could be large like 64Gb and it is good to allocate it once)
  					for (uint32_t tokenIdx = 0; tokenIdx < numTokens; ++tokenIdx) {
  						const Token *dataToken = GetRequiredToken(Content, tokenIdx);
  						size_t tokenLength = dataToken->end() - dataToken->begin() - 2; // ignore double quotes
  						const char *base64data = dataToken->begin() + 1;
  						const size_t outLength = Util::ComputeDecodedSizeBase64(base64data, tokenLength);
  						if (outLength == 0) {
  							DOMError("Corrupted embedded content found", element);
  						}
  						targetLength += outLength;
  					}
  					if (targetLength == 0) {
  						DOMError("Corrupted embedded content found", element);
  					} else {
  						content = new uint8_t[targetLength];
  						contentLength = static_cast<uint64_t>(targetLength);
  						size_t dst_offset = 0;
  						for (uint32_t tokenIdx = 0; tokenIdx < numTokens; ++tokenIdx) {
  							const Token *dataToken = GetRequiredToken(Content, tokenIdx);
  							ERR_FAIL_COND(!dataToken);
  							size_t tokenLength = dataToken->end() - dataToken->begin() - 2; // ignore double quotes
  							const char *base64data = dataToken->begin() + 1;
  							dst_offset += Util::DecodeBase64(base64data, tokenLength, content + dst_offset, targetLength - dst_offset);
  						}
  						if (targetLength != dst_offset) {
  							delete[] content;
  							contentLength = 0;
  							DOMError("Corrupted embedded content found", element);
  						}
  					}
  				}
  			} else if (static_cast<size_t>(token->end() - data) < 5) {
  				DOMError("binary data array is too short, need five (5) bytes for type signature and element count", element);
  			} else if (*data != 'R') {
  				DOMWarning("video content is not raw binary data, ignoring", element);
  			} else {
  				// read number of elements
  				uint32_t len = 0;
  				::memcpy(&len, data + 1, sizeof(len));
  				AI_SWAP4(len);
  
  				contentLength = len;
  
  				content = new uint8_t[len];
  				::memcpy(content, data + 5, len);
  			}
  		} catch (...) {
  			//			//we don't need the content data for contents that has already been loaded
  			//			ASSIMP_LOG_VERBOSE_DEBUG_F("Caught exception in FBXMaterial (likely because content was already loaded): ",
  			//									   runtimeError.what());
  		}
  	}
  
  	props = GetPropertyTable(doc, "Video.FbxVideo", element, sc);
  }
  
  Video::~Video() {
  	if (content) {
  		delete[] content;
  	}
  
  	if (props != nullptr) {
  		delete props;
  		props = nullptr;
  	}
  }
  } // namespace FBXDocParser
  