gprofng/src/DataStream.h

   1 /* Copyright (C) 2021-2024 Free Software Foundation, Inc.
   2    Contributed by Oracle.
   3
   4    This file is part of GNU Binutils.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #ifndef _DATASTREAM_H
  22 #define _DATASTREAM_H
  23
  24 #include "Data_window.h"
  25
  26 // sequential access to the file
  27 class DataStream : public Data_window
  28 {
  29 public:
  30   // Create an empty data window.
  31   DataStream (char *file_name);
  32   ~DataStream ();
  33   void set_span (int64_t f_offset, int64_t sz);
  34   int64_t read (void *buf, int64_t len);
  35
  36   template <typename Key_t> inline int64_t
  37   read (Key_t &val)
  38   {
  39     int64_t sz = read (&val, sizeof (val));
  40     if (need_swap_endian && sz == sizeof (val))
  41       swapByteOrder (&val, sizeof (val));
  42     return sz;
  43   }
  44
  45 private:
  46   int64_t span_offset;
  47   int64_t span_size;        // the window size
  48   int64_t span_fileoffset;  // the window begin on the file
  49 };
  50
  51 #endif /* _DATASTREAM_H */