allwpilib/include/support/raw_istream.h

/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2015. All Rights Reserved.                             */
/* Open Source Software - may be modified and shared by FRC teams. The code   */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project.                                                               */
/*----------------------------------------------------------------------------*/

#ifndef WPIUTIL_SUPPORT_RAW_ISTREAM_H_
#define WPIUTIL_SUPPORT_RAW_ISTREAM_H_

#include <cstddef>

namespace wpi {

class raw_istream {
 public:
  raw_istream() = default;
  virtual ~raw_istream() = default;
  virtual bool read(void* data, std::size_t len) = 0;
  virtual void close() = 0;

  raw_istream(const raw_istream&) = delete;
  raw_istream& operator=(const raw_istream&) = delete;
};

class raw_mem_istream : public raw_istream {
 public:
  raw_mem_istream(const char* mem, std::size_t len) : m_cur(mem), m_left(len) {}
  virtual ~raw_mem_istream() = default;
  virtual bool read(void* data, std::size_t len);
  virtual void close() {}

 private:
  const char* m_cur;
  std::size_t m_left;
};

}  // namespace wpi

#endif  // WPIUTIL_SUPPORT_RAW_ISTREAM_H_