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
DataStream(char * filename)26 DataStream::DataStream (char *filename) : Data_window (filename)
27 {
28 set_span (0, -1);
29 }
30
~DataStream()31 DataStream::~DataStream () { }
32
33 void
set_span(int64_t f_offset,int64_t sz)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
read(void * buf,int64_t len)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 }
56