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/* Copyright (C) 2021 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "config.h"
#include "util.h"
#include "DataStream.h"
#include "debug.h"
DataStream::DataStream (char *filename) : Data_window (filename)
{
set_span (0, -1);
}
DataStream::~DataStream () { }
void
DataStream::set_span (int64_t f_offset, int64_t sz)
{
span_offset = 0;
span_fileoffset = f_offset;
int64_t fsz = get_fsize ();
span_size = sz == -1 ? fsz : sz;
if (span_fileoffset >= fsz)
span_fileoffset = fsz;
if (span_size > fsz - span_fileoffset)
span_size = fsz - span_fileoffset;
}
int64_t
DataStream::read (void *buf, int64_t len)
{
if (len > span_size - span_offset)
len = span_size - span_offset;
int64_t off = span_offset + span_fileoffset;
span_offset += len;
get_data (off, len, buf);
return len;
}
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