Move FuzzedDataProvider to //base and expose to blink

net/base/fuzzed_data_provider.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef NET_BASE_FUZZED_DATA_PROVIDER_H
-#define NET_BASE_FUZZED_DATA_PROVIDER_H
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "base/strings/string_piece.h"
-
-namespace net {
-
-// Utility class to break up fuzzer input for multiple consumers. Whenever run
-// on the same input, provides the same output, as long as its methods are
-// called in the same order, with the same arguments.
-class FuzzedDataProvider {
- public:
-  // |data| is an array of length |size| that the FuzzedDataProvider wraps to
-  // provide more granular access. |data| must outlive the FuzzedDataProvider.
-  FuzzedDataProvider(const uint8_t* data, size_t size);
-  ~FuzzedDataProvider();
-
-  // Returns a StringPiece containing |num_bytes| of input data. If fewer than
-  // |num_bytes| of data remain, returns a shorter StringPiece containing all
-  // of the data that's left. The data pointed at by the returned StringPiece
-  // must not be used after the FuzzedDataProvider is destroyed.
-  base::StringPiece ConsumeBytes(size_t num_bytes);
-
-  // Returns a StringPiece containing all remaining bytes of the input data.
-  // The data pointed at by the returned StringPiece must not be used after the
-  // FuzzedDataProvider is destroyed.
-  base::StringPiece ConsumeRemainingBytes();
-
-  // Returns a number in the range [min, max] by consuming bytes from the input
-  // data. The value might not be uniformly distributed in the given range. If
-  // there's no input data left, always returns |min|. |min| must be less than
-  // or equal to |max|.
-  uint32_t ConsumeUint32InRange(uint32_t min, uint32_t max);
-  int ConsumeInt32InRange(int min, int max);
-
-  // Returns a bool, or false when no data remains.
-  bool ConsumeBool();
-
-  // Returns a uint8_t from the input or 0 if nothing remains. This is
-  // equivalent to ConsumeUint32InRange(0, 0xFF).
-  uint8_t ConsumeUint8();
-
-  // Returns a uint16_t from the input. If fewer than 2 bytes of data remain
-  // will fill the most significant bytes with 0. This is equivalent to
-  // ConsumeUint32InRange(0, 0xFFFF).
-  uint16_t ConsumeUint16();
-
-  // Returns a value from |array|, consuming as many bytes as needed to do so.
-  // |array| must be a fixed-size array. Equivalent to
-  // array[ConsumeUint32InRange(sizeof(array)-1)];
-  template <typename Type, size_t size>
-  Type PickValueInArray(Type (&array)[size]) {
-    return array[ConsumeUint32InRange(0, size - 1)];
-  }
-
-  // Reports the remaining bytes available for fuzzed input.
-  size_t remaining_bytes() { return remaining_data_.length(); }
-
- private:
-  base::StringPiece remaining_data_;
-
-  DISALLOW_COPY_AND_ASSIGN(FuzzedDataProvider);
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_FUZZED_DATA_PROVIDER_H