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