EmuFileWrapper.h

/*
 *  Copyright (C) 2005-2018 Team Kodi
 *  This file is part of Kodi - https://kodi.tv
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *  See LICENSES/README.md for more information.
 */

#pragma once

#include "threads/CriticalSection.h"

#include <stdio.h>

#if defined(TARGET_POSIX) && !defined(TARGET_DARWIN) && !defined(TARGET_FREEBSD) && !defined(TARGET_ANDROID) && !defined(__UCLIBC__)
#define _file _fileno
#elif defined(__UCLIBC__)
#define _file __filedes
#endif

#define MAX_EMULATED_FILES    50
#define FILE_WRAPPER_OFFSET   0x00000200

namespace XFILE
{
  class CFile;
}

typedef struct stEmuFileObject
{
  XFILE::CFile*  file_xbmc;
  CCriticalSection *file_lock;
  int mode;
  //Stick this last to avoid 3-7 bytes of padding
  bool    used;
  int     fd;
} EmuFileObject;

class CEmuFileWrapper
{
public:
  CEmuFileWrapper();
  ~CEmuFileWrapper();

  void CleanUp();

  EmuFileObject* RegisterFileObject(XFILE::CFile* pFile);
  void UnRegisterFileObjectByDescriptor(int fd);
  void UnRegisterFileObjectByStream(FILE* stream);
  void LockFileObjectByDescriptor(int fd);
  bool TryLockFileObjectByDescriptor(int fd);
  void UnlockFileObjectByDescriptor(int fd);
  EmuFileObject* GetFileObjectByDescriptor(int fd);
  EmuFileObject* GetFileObjectByStream(FILE* stream);
  XFILE::CFile* GetFileXbmcByDescriptor(int fd);
  XFILE::CFile* GetFileXbmcByStream(FILE* stream);
  static int GetDescriptorByStream(FILE* stream);
  FILE* GetStreamByDescriptor(int fd);
  static constexpr bool DescriptorIsEmulatedFile(int fd)
  {
    return fd >= FILE_WRAPPER_OFFSET && fd < FILE_WRAPPER_OFFSET + MAX_EMULATED_FILES;
  }
  static bool StreamIsEmulatedFile(FILE* stream);
private:
  EmuFileObject m_files[MAX_EMULATED_FILES];
  CCriticalSection m_criticalSection;
};

extern CEmuFileWrapper g_emuFileWrapper;