headers/private/support/DataPositionIOWrapper.h

   1 /*
   2  * Copyright 2014, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _DATA_POSITION_IO_WRAPPER_H_
   6 #define _DATA_POSITION_IO_WRAPPER_H_
   7
   8
   9 #include <DataIO.h>
  10
  11
  12 class BDataPositionIOWrapper : public BPositionIO {
  13 public:
  14                                                                 BDataPositionIOWrapper(BDataIO* io);
  15                                                                 ~BDataPositionIOWrapper();
  16
  17         virtual ssize_t                         Read(void* buffer, size_t size);
  18         virtual ssize_t                         Write(const void* buffer, size_t size);
  19
  20         virtual ssize_t                         ReadAt(off_t position, void* buffer,
  21                                                                         size_t size);
  22         virtual ssize_t                         WriteAt(off_t position, const void* buffer,
  23                                                                         size_t size);
  24
  25         virtual off_t                           Seek(off_t position, uint32 seekMode);
  26         virtual off_t                           Position() const;
  27
  28         virtual status_t                        SetSize(off_t size);
  29         virtual status_t                        GetSize(off_t* size) const;
  30
  31 private:
  32                                 BDataIO*                fIO;
  33                                 off_t                   fPosition;
  34 };
  35
  36
  37 #endif  // _DATA_POSITION_IO_WRAPPER_H_