assimp/code/AssetLib/3MF/D3MFOpcPackage.cpp

/*
Open Asset Import Library (assimp)
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  following disclaimer.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

#ifndef ASSIMP_BUILD_NO_3MF_IMPORTER

#include "D3MFOpcPackage.h"
#include <assimp/Exceptional.h>
#include <assimp/XmlParser.h>
#include <assimp/ZipArchiveIOSystem.h>
#include <assimp/ai_assert.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/IOStream.hpp>
#include <assimp/IOSystem.hpp>
#include <assimp/texture.h>
#include "3MFXmlTags.h"

#include <algorithm>
#include <cassert>
#include <cstdlib>
#include <map>
#include <vector>

namespace Assimp {

namespace D3MF {
// ------------------------------------------------------------------------------------------------

using OpcPackageRelationshipPtr = std::shared_ptr<OpcPackageRelationship>;

class OpcPackageRelationshipReader {
public:
    OpcPackageRelationshipReader(XmlParser &parser) :
            m_relationShips() {
        XmlNode root = parser.getRootNode();
        ParseRootNode(root);
    }

    void ParseRootNode(XmlNode &node) {
        ParseAttributes(node);
        for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {
            std::string name = currentNode.name();
            if (name == "Relationships") {
                ParseRelationsNode(currentNode);
            }
        }
    }

    void ParseAttributes(XmlNode & /*node*/) {
        // empty
    }

    bool validateRels(OpcPackageRelationshipPtr &relPtr) {
        if (relPtr->id.empty() || relPtr->type.empty() || relPtr->target.empty()) {
            return false;
        }

        return true;
    }

    void ParseRelationsNode(XmlNode &node) {
        if (node.empty()) {
            return;
        }

        for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {
            const std::string name = currentNode.name();
            if (name == "Relationship") {
                OpcPackageRelationshipPtr relPtr(new OpcPackageRelationship());
                relPtr->id = currentNode.attribute(XmlTag::RELS_ATTRIB_ID).as_string();
                relPtr->type = currentNode.attribute(XmlTag::RELS_ATTRIB_TYPE).as_string();
                relPtr->target = currentNode.attribute(XmlTag::RELS_ATTRIB_TARGET).as_string();
                if (validateRels(relPtr)) {
                    m_relationShips.push_back(relPtr);
                }
            }
        }
    }

    std::vector<OpcPackageRelationshipPtr> m_relationShips;
};

static bool IsEmbeddedTexture( const std::string &filename ) {
    const std::string extension = BaseImporter::GetExtension(filename);
    if (extension == "jpg" || extension == "png") {
        std::string::size_type pos = filename.find("thumbnail");
        if (pos == std::string::npos) {
            return false;
        }
        return true;
    }

    return false;
}
// ------------------------------------------------------------------------------------------------
D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :
        mRootStream(nullptr),
        mZipArchive() {
    mZipArchive = new ZipArchiveIOSystem(pIOHandler, rFile);
    if (!mZipArchive->isOpen()) {
        throw DeadlyImportError("Failed to open file ", rFile, ".");
    }

    std::vector<std::string> fileList;
    mZipArchive->getFileList(fileList);

    for (auto &file : fileList) {
        if (file == D3MF::XmlTag::ROOT_RELATIONSHIPS_ARCHIVE) {
            if (!mZipArchive->Exists(file.c_str())) {
                continue;
            }

            IOStream *fileStream = mZipArchive->Open(file.c_str());
            if (nullptr == fileStream) {
                ASSIMP_LOG_ERROR("Filestream is nullptr.");
                continue;
            }

            std::string rootFile = ReadPackageRootRelationship(fileStream);
            if (!rootFile.empty() && rootFile[0] == '/') {
                rootFile = rootFile.substr(1);
                if (rootFile[0] == '/') {
                    // deal with zip-bug
                    rootFile = rootFile.substr(1);
                }
            } 

            ASSIMP_LOG_VERBOSE_DEBUG(rootFile);

            mZipArchive->Close(fileStream);

            mRootStream = mZipArchive->Open(rootFile.c_str());
            ai_assert(mRootStream != nullptr);
            if (nullptr == mRootStream) {
                throw DeadlyImportError("Cannot open root-file in archive : " + rootFile);
            }
        } else if (file == D3MF::XmlTag::CONTENT_TYPES_ARCHIVE) {
            ASSIMP_LOG_WARN("Ignored file of unsupported type CONTENT_TYPES_ARCHIVES", file);
        } else if (IsEmbeddedTexture(file)) {
            IOStream *fileStream = mZipArchive->Open(file.c_str());
            LoadEmbeddedTextures(fileStream, file);
            mZipArchive->Close(fileStream);
        } else {
            ASSIMP_LOG_WARN("Ignored file of unknown type: ", file);
        }
    }
}

D3MFOpcPackage::~D3MFOpcPackage() {
    mZipArchive->Close(mRootStream);
    delete mZipArchive;
}

IOStream *D3MFOpcPackage::RootStream() const {
    return mRootStream;
}

const std::vector<aiTexture *> &D3MFOpcPackage::GetEmbeddedTextures() const {
    return mEmbeddedTextures;
}

static const char *const ModelRef = "3D/3dmodel.model";

bool D3MFOpcPackage::validate() {
    if (nullptr == mRootStream || nullptr == mZipArchive) {
        return false;
    }

    return mZipArchive->Exists(ModelRef);
}

std::string D3MFOpcPackage::ReadPackageRootRelationship(IOStream *stream) {
    XmlParser xmlParser;
    if (!xmlParser.parse(stream)) {
        return std::string();
    }

    OpcPackageRelationshipReader reader(xmlParser);

    auto itr = std::find_if(reader.m_relationShips.begin(), reader.m_relationShips.end(), [](const OpcPackageRelationshipPtr &rel) {
        return rel->type == XmlTag::PACKAGE_START_PART_RELATIONSHIP_TYPE;
    });

    if (itr == reader.m_relationShips.end()) {
        throw DeadlyImportError("Cannot find ", XmlTag::PACKAGE_START_PART_RELATIONSHIP_TYPE);
    }

    return (*itr)->target;
}

void D3MFOpcPackage::LoadEmbeddedTextures(IOStream *fileStream, const std::string &filename) {
    if (nullptr == fileStream) {
        return;
    }

    const size_t size = fileStream->FileSize();
    if (0 == size) {
        return;
    }

    unsigned char *data = new unsigned char[size];
    fileStream->Read(data, 1, size);
    aiTexture *texture = new aiTexture;
    std::string embName = "*" + filename;
    texture->mFilename.Set(embName.c_str());
    texture->mWidth = static_cast<unsigned int>(size);
    texture->mHeight = 0;
    texture->achFormatHint[0] = 'p';
    texture->achFormatHint[1] = 'n';
    texture->achFormatHint[2] = 'g';
    texture->achFormatHint[3] = '\0';
    texture->pcData = (aiTexel*) data;
    mEmbeddedTextures.emplace_back(texture);
}

} // Namespace D3MF
} // Namespace Assimp

#endif //ASSIMP_BUILD_NO_3MF_IMPORTER