// Copyright 2018 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 <stdint.h>

#include <stdlib.h>

// Arbitrary limits to prevent OOM, timeout, or slow execution.

//

// The decoded image size, and for animations additionally the canvas size.

static const size_t kFuzzPxLimit = 1024 * 1024;

// Demuxed or decoded animation frames.

static const int kFuzzFrameLimit = 3;

// Reads and sums (up to) 128 spread-out bytes.

uint8_t FuzzHash(const uint8_t* const data, size_t size) {

  uint8_t value = 0;

  size_t incr = size / 128;

  if (!incr) incr = 1;

  for (size_t i = 0; i < size; i += incr) value += data[i];

  return value;

}