#include <qpdf/Buffer.hh>

#include <qpdf/BufferInputSource.hh>

#include <qpdf/Pl_Discard.hh>

#include <qpdf/Pl_Flate.hh>

#include <qpdf/QPDF.hh>

#include <qpdf/QPDFWriter.hh>

#include <qpdf/QUtil.hh>

#include <qpdf/global.hh>

class FuzzHelper

{

  public:

    FuzzHelper(unsigned char const* data, size_t size) :

        // We do not modify data, so it is safe to remove the const for Buffer

        input_buffer(const_cast<unsigned char*>(data), size)

    {

    }

    void

    run()

    {

        qpdf::global::options::fuzz_mode(true);

        // The goal here is that you should be able to throw anything at libqpdf and it will respond

        // without any memory errors and never do anything worse than throwing a QPDFExc or

        // std::runtime_error. Throwing any other kind of exception, segfaulting, or having a memory

        // error (when built with appropriate sanitizers) will all cause abnormal exit.

        try {

            std::cerr << "\ninfo: starting testWrite\n";

            auto is = std::make_shared<BufferInputSource>("fuzz input", &input_buffer);

            QPDF qpdf;

            qpdf.processInputSource(is);

            QPDFWriter w(qpdf);

            w.setOutputPipeline(&discard);

            w.setDecodeLevel(qpdf_dl_all);

            w.setDeterministicID(true);

            w.setObjectStreamMode(qpdf_o_generate);

            w.setLinearization(true);

            w.write();

        } catch (std::runtime_error const& e) {

            std::cerr << "runtime_error: " << e.what() << '\n';

        }

    }

  private:

    Buffer input_buffer;

    Pl_Discard discard;

};

extern "C" int

LLVMFuzzerTestOneInput(unsigned char const* data, size_t size)

{

#ifndef _WIN32

    // Used by jpeg library to work around false positives in memory sanitizer.

    setenv("JSIMD_FORCENONE", "1", 1);

#endif

    FuzzHelper f(data, size);

    f.run();

    return 0;

}