CrwDecompressor.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 "decompressors/CrwDecompressor.h"
#include "MemorySanitizer.h"
#include "adt/Array1DRef.h"
#include "adt/Casts.h"
#include "adt/Optional.h"
#include "common/RawImage.h"
#include "common/RawspeedException.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);
 
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));
 
    const uint32_t dec_table = bs.getU32();
    const uint32_t lowbits = bs.getU32();
 
    rawspeed::Optional<rawspeed::Array1DRef<const uint8_t>> lowbitInput;
    if (lowbits != 0) {
      lowbitInput = bs.getBuffer(lowbits);
    }
 
    rawspeed::Array1DRef<const uint8_t> input =
        bs.peekRemainingBuffer().getAsArray1DRef();
 
    rawspeed::CrwDecompressor c(mRaw, dec_table, input, lowbitInput);
    mRaw->createData();
    c.decompress();
 
    rawspeed::MSan::CheckMemIsInitialized(
        mRaw->getByteDataAsUncroppedArray2DRef());
  } catch (const rawspeed::RawspeedException&) { // NOLINT(bugprone-empty-catch)
    // Exceptions are good, crashes are bad.
  }
 
  return 0;
}