gprofng/src/DataStream.cc

   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 #include "config.h"
  22 #include "util.h"
  23 #include "DataStream.h"
  24 #include "debug.h"
  25
  26 DataStream::DataStream (char *filename) : Data_window (filename)
  27 {
  28   set_span (0, -1);
  29 }
  30
  31 DataStream::~DataStream () { }
  32
  33 void
  34 DataStream::set_span (int64_t f_offset, int64_t sz)
  35 {
  36   span_offset = 0;
  37   span_fileoffset = f_offset;
  38   int64_t fsz = get_fsize ();
  39   span_size = sz == -1 ? fsz : sz;
  40   if (span_fileoffset >= fsz)
  41     span_fileoffset = fsz;
  42   if (span_size > fsz - span_fileoffset)
  43     span_size = fsz - span_fileoffset;
  44 }
  45
  46 int64_t
  47 DataStream::read (void *buf, int64_t len)
  48 {
  49   if (len > span_size - span_offset)
  50     len = span_size - span_offset;
  51   int64_t off = span_offset + span_fileoffset;
  52   span_offset += len;
  53   get_data (off, len, buf);
  54   return len;
  55 }