assimp/code/Importer/StepFile/StepFileImporter.cpp

/*
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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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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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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* pScene, 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