DummyLJpegDecoder.cpp

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/*
    RawSpeed - RAW file decoder.
 
    Copyright (C) 2017 Roman Lebedev
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
 
#include "adt/Casts.h"
#include "common/RawImage.h"
#include "common/RawspeedException.h"
#include "decoders/RawDecoderException.h"
#include "decompressors/AbstractLJpegDecoder.h"
#include "fuzz/Common.h"
#include "io/Buffer.h"
#include "io/ByteStream.h"
#include "io/Endianness.h"
#include <cassert>
#include <cstdint>
#include <cstdio>
 
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size);
 
namespace {
 
class DummyLJpegDecoder final : public rawspeed::AbstractLJpegDecoder {
  [[nodiscard]] rawspeed::ByteStream::size_type decodeScan() final {
    ThrowRDE("Success!");
  }
 
public:
  DummyLJpegDecoder(const rawspeed::ByteStream& bs,
                    const rawspeed::RawImage& img)
      : AbstractLJpegDecoder(bs, img) {}
 
  void decode() { AbstractLJpegDecoder::decodeSOI(); }
};
 
} // namespace
 
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) {
  assert(Data);
 
  try {
    const rawspeed::Buffer b(
        Data, rawspeed::implicit_cast<rawspeed::Buffer::size_type>(Size));
    const rawspeed::DataBuffer db(b, rawspeed::Endianness::little);
    rawspeed::ByteStream bs(db);
 
    rawspeed::RawImage mRaw(CreateRawImage(bs));
 
    DummyLJpegDecoder d(bs, mRaw);
    d.decode();
    mRaw->createData();
 
    // no image data was actually be decoded, so don't check for initialization
  } catch (const rawspeed::RawspeedException&) { // NOLINT(bugprone-empty-catch)
    // Exceptions are good, crashes are bad.
  }
 
  return 0;
}