/*

 * Copyright (C) 2019 The Android Open Source Project

 *

 * 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.

 */

#pragma once

#include <stdint.h>

#include <vector>

#include <unwindstack/Memory.h>

namespace unwindstack {

class MemoryBuffer : public Memory {

 public:

  // If a size is too large, assume it's likely corrupted data, and set to zero.

  MemoryBuffer(size_t size) : raw_(size > kMaxBufferSize ? 0 : size), offset_(0) {}

  MemoryBuffer(size_t size, uint64_t offset)

      : raw_(size > kMaxBufferSize ? 0 : size), offset_(offset) {}

  virtual ~MemoryBuffer() = default;

  size_t Read(uint64_t addr, void* dst, size_t size) override;

  uint8_t* GetPtr(size_t offset) override;

  uint8_t* Data() { return raw_.data(); }

  uint64_t Size() { return raw_.size(); }

 private:

  std::vector<uint8_t> raw_;

  uint64_t offset_;

  // This class is only used for global data and a compressed .debug_frame in

  // the library code. The limit of 10MB is way over what any valid existing

  // globals data section is expected to be. A 50MB shared library only contains

  // a .debug_frame that is < 100KB in size. Therefore, 10MB should be able to

  // handle any valid large shared library with a valid large .debug_frame.

  static constexpr size_t kMaxBufferSize = 10 * 1024 * 1024;

};

}  // namespace unwindstack