xref: /aosp_15_r20/system/unwinding/libunwindstack/MemoryFileAtOffset.h (revision eb293b8f56ee8303637c5595cfcdeef8039e85c6)

/*
 * 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 <unwindstack/Memory.h>

namespace unwindstack {

class MemoryFileAtOffset : public Memory {
 public:
  MemoryFileAtOffset() = default;
  virtual ~MemoryFileAtOffset();

  bool Init(const std::string& file, uint64_t offset, uint64_t size = UINT64_MAX);

  uint8_t* GetPtr(size_t addr = 0) override { return addr < size_ ? data_ + addr : nullptr; }

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

  size_t Size() { return size_; }

  void Clear() override;

 protected:
  size_t size_ = 0;
  size_t offset_ = 0;
  uint8_t* data_ = nullptr;
};

}  // namespace unwindstack