File.h

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#ifndef STORAGE_FACTORY_FILE_H
# define STORAGE_FACTORY_FILE_H

# include "Utilities/StorageFactory/interface/IOTypes.h"
# include "Utilities/StorageFactory/interface/IOFlags.h"
# include "Utilities/StorageFactory/interface/Storage.h"
# include "Utilities/StorageFactory/interface/IOChannel.h"
# include <string>

class File : public IOChannel, public Storage
{
public:
  File (void);
  File (IOFD fd, bool autoclose = true);
  File (const char *name, int flags = IOFlags::OpenRead, int perms = 0666);
  File (const std::string &name, int flags = IOFlags::OpenRead, int perms = 0666);
  ~File (void);
  // implicit copy constructor
  // implicit assignment operator

  virtual void      create (const char *name,
                bool exclusive = false,
                int perms = 0666);
  virtual void      create (const std::string &name,
                bool exclusive = false,
                int perms = 0666);
  virtual void      open (const char *name,
                  int flags = IOFlags::OpenRead,
                  int perms = 0666);
  virtual void      open (const std::string &name,
                  int flags = IOFlags::OpenRead,
                  int perms = 0666);
  virtual void      attach (IOFD fd);

  using Storage::read;
  using Storage::readv;
  using Storage::write;
  using Storage::writev;
  using Storage::position;

  virtual bool      prefetch (const IOPosBuffer *what, IOSize n);
  virtual IOSize    read (void *into, IOSize n);
  virtual IOSize    read (void *into, IOSize n, IOOffset pos);
  virtual IOSize    readv (IOBuffer *into, IOSize length);

  virtual IOSize    write (const void *from, IOSize n);
  virtual IOSize    write (const void *from, IOSize n, IOOffset pos);
  virtual IOSize    writev (const IOBuffer *from, IOSize length);

  virtual IOOffset  size (void) const;
  virtual IOOffset  position (IOOffset offset, Relative whence = SET);

  virtual void      resize (IOOffset size);

  virtual void      flush (void);
  virtual void      close (void);
  virtual void      abort (void);

  virtual void      setAutoClose (bool closeit);

private:
  enum { InternalAutoClose = 4096 }; //< Close on delete

  File (IOFD fd, unsigned flags);

  File *        duplicate (bool copy) const;
  File *        duplicate (File *child) const;
  static IOFD       sysduplicate (IOFD fd);
  static void       sysopen (const char *name, int flags, int perms,
                 IOFD &newfd, unsigned &newflags);
  static bool       sysclose (IOFD fd, int *error = 0);

  unsigned      m_flags;
};

#endif // STORAGE_FACTORY_FILE_H