1*c42dbd0eSchristos /* Copyright (C) 2021 Free Software Foundation, Inc.
2*c42dbd0eSchristos Contributed by Oracle.
3*c42dbd0eSchristos
4*c42dbd0eSchristos This file is part of GNU Binutils.
5*c42dbd0eSchristos
6*c42dbd0eSchristos This program is free software; you can redistribute it and/or modify
7*c42dbd0eSchristos it under the terms of the GNU General Public License as published by
8*c42dbd0eSchristos the Free Software Foundation; either version 3, or (at your option)
9*c42dbd0eSchristos any later version.
10*c42dbd0eSchristos
11*c42dbd0eSchristos This program is distributed in the hope that it will be useful,
12*c42dbd0eSchristos but WITHOUT ANY WARRANTY; without even the implied warranty of
13*c42dbd0eSchristos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*c42dbd0eSchristos GNU General Public License for more details.
15*c42dbd0eSchristos
16*c42dbd0eSchristos You should have received a copy of the GNU General Public License
17*c42dbd0eSchristos along with this program; if not, write to the Free Software
18*c42dbd0eSchristos Foundation, 51 Franklin Street - Fifth Floor, Boston,
19*c42dbd0eSchristos MA 02110-1301, USA. */
20*c42dbd0eSchristos
21*c42dbd0eSchristos #include "config.h"
22*c42dbd0eSchristos #include "util.h"
23*c42dbd0eSchristos #include "DataStream.h"
24*c42dbd0eSchristos #include "debug.h"
25*c42dbd0eSchristos
DataStream(char * filename)26*c42dbd0eSchristos DataStream::DataStream (char *filename) : Data_window (filename)
27*c42dbd0eSchristos {
28*c42dbd0eSchristos set_span (0, -1);
29*c42dbd0eSchristos }
30*c42dbd0eSchristos
~DataStream()31*c42dbd0eSchristos DataStream::~DataStream () { }
32*c42dbd0eSchristos
33*c42dbd0eSchristos void
set_span(int64_t f_offset,int64_t sz)34*c42dbd0eSchristos DataStream::set_span (int64_t f_offset, int64_t sz)
35*c42dbd0eSchristos {
36*c42dbd0eSchristos span_offset = 0;
37*c42dbd0eSchristos span_fileoffset = f_offset;
38*c42dbd0eSchristos int64_t fsz = get_fsize ();
39*c42dbd0eSchristos span_size = sz == -1 ? fsz : sz;
40*c42dbd0eSchristos if (span_fileoffset >= fsz)
41*c42dbd0eSchristos span_fileoffset = fsz;
42*c42dbd0eSchristos if (span_size > fsz - span_fileoffset)
43*c42dbd0eSchristos span_size = fsz - span_fileoffset;
44*c42dbd0eSchristos }
45*c42dbd0eSchristos
46*c42dbd0eSchristos int64_t
read(void * buf,int64_t len)47*c42dbd0eSchristos DataStream::read (void *buf, int64_t len)
48*c42dbd0eSchristos {
49*c42dbd0eSchristos if (len > span_size - span_offset)
50*c42dbd0eSchristos len = span_size - span_offset;
51*c42dbd0eSchristos int64_t off = span_offset + span_fileoffset;
52*c42dbd0eSchristos span_offset += len;
53*c42dbd0eSchristos get_data (off, len, buf);
54*c42dbd0eSchristos return len;
55*c42dbd0eSchristos }
56