// Copyright 2020 Google Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//

////////////////////////////////////////////////////////////////////////////////

#include <cstddef>

#include <cstdint>

#include <string_view>

#include "./fuzz_utils.h"

#include "./nalloc.h"

#include "imageio/imageio_util.h"

#include "src/webp/decode.h"

#include "src/webp/demux.h"

#include "src/webp/mux_types.h"

namespace {

void AnimDecoderTest(std::string_view blob) {

  const uint8_t* const data = reinterpret_cast<const uint8_t*>(blob.data());

  const size_t size = blob.size();

  nalloc_init(nullptr);

  nalloc_start(data, size);

  // WebPAnimDecoderGetInfo() is too late to check the canvas size as

  // WebPAnimDecoderNew() will handle the allocations.

  const size_t kMaxNumBytes = 2684354560;  // RSS (resident set size) limit.

  const size_t kMaxNumPixels = kMaxNumBytes / 4;       // At most ARGB.

  const size_t kMaxNumPixelsSafe = kMaxNumPixels / 2;  // Allow one buffer copy.

  WebPBitstreamFeatures features;

  if (WebPGetFeatures(data, size, &features) == VP8_STATUS_OK) {

    if (!ImgIoUtilCheckSizeArgumentsOverflow(features.width * 4,

                                             features.height) ||

        static_cast<size_t>(features.width) * features.height >

            kMaxNumPixelsSafe) {

      nalloc_end();

      return;

    }

  }

  // decode everything as an animation

  WebPData webp_data = {data, size};

  WebPAnimDecoder* const dec = WebPAnimDecoderNew(&webp_data, nullptr);

  if (dec == nullptr) {

    nalloc_end();

    return;

  }

  WebPAnimInfo info;

  if (!WebPAnimDecoderGetInfo(dec, &info)) goto End;

  if (!ImgIoUtilCheckSizeArgumentsOverflow(info.canvas_width * 4,

                                           info.canvas_height)) {

    goto End;

  }

  while (WebPAnimDecoderHasMoreFrames(dec)) {

    uint8_t* buf;

    int timestamp;

    if (!WebPAnimDecoderGetNext(dec, &buf, &timestamp)) break;

  }

End:

  WebPAnimDecoderDelete(dec);

  nalloc_end();

}

}  // namespace

FUZZ_TEST(AnimDecoder, AnimDecoderTest)

    .WithDomains(fuzztest::String().WithMaxSize(fuzz_utils::kMaxWebPFileSize +

                                                1));