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
26DataStream::DataStream (char *filename) : Data_window (filename)
27{
28  set_span (0, -1);
29}
30
31DataStream::~DataStream () { }
32
33void
34DataStream::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
46int64_t
47DataStream::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}
56