assimp.assimp/code/AssetLib/StepFile/StepFileImporter.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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Copyright (c) 2006-2020, assimp team



All rights reserved.

Redistribution and use of this software in source and binary forms,
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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

#ifndef ASSIMP_BUILD_NO_STEP_IMPORTER

#include "StepFileImporter.h"
#include "../../Importer/STEPParser/STEPFileReader.h"
#include <assimp/importerdesc.h>
#include <assimp/DefaultIOSystem.h>

namespace Assimp {
namespace StepFile {

using namespace STEP;

static const aiImporterDesc desc = { "StepFile Importer",
                                "",
                                "",
                                "",
                                0,
                                0,
                                0,
                                0,
                                0,
                                "stp" };

StepFileImporter::StepFileImporter()
: BaseImporter() {

}

StepFileImporter::~StepFileImporter() {

}

bool StepFileImporter::CanRead(const std::string& file, IOSystem* pIOHandler, bool checkSig) const {
    const std::string &extension = GetExtension(file);
    if ( extension == "stp" || extension == "step" ) {
        return true;
    } else if ((!extension.length() || checkSig) && pIOHandler) {
        const char* tokens[] = { "ISO-10303-21" };
        const bool found(SearchFileHeaderForToken(pIOHandler, file, tokens, 1));
        return found;
    }

    return false;
}

const aiImporterDesc *StepFileImporter::GetInfo() const {
    return &desc;
}

static const std::string mode = "rb";
static const std::string StepFileSchema = "CONFIG_CONTROL_DESIGN";

void StepFileImporter::InternReadFile(const std::string &file, aiScene*, IOSystem* pIOHandler) {
    // Read file into memory
    std::shared_ptr<IOStream> fileStream(pIOHandler->Open(file, mode));
    if (!fileStream.get()) {
        throw DeadlyImportError("Failed to open file " + file + ".");
    }

    std::unique_ptr<STEP::DB> db(STEP::ReadFileHeader(fileStream));
    const STEP::HeaderInfo& head = static_cast<const STEP::DB&>(*db).GetHeader();
    if (!head.fileSchema.size() || head.fileSchema != StepFileSchema) {
        DeadlyImportError("Unrecognized file schema: " + head.fileSchema);
    }
}

} // Namespace StepFile
} // Namespace Assimp

#endif // ASSIMP_BUILD_NO_STEP_IMPORTER