ca5bb76d2b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18012 a1c6a512-1295-4272-9138-f99709370657
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/* zenutils - Utilities for working with creative firmwares.
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* Copyright 2007 (c) Rasmus Ry <rasmus.ry{at}gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "file.h"
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#include <fstream>
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bool shared::read_file(const std::string& filename, bytes& buffer,
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std::streampos offset, std::streamsize count)
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{
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std::ifstream ifs;
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ifs.open(filename.c_str(), std::ios::binary);
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if (!ifs)
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{
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return false;
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}
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std::ifstream::pos_type startpos = offset;
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ifs.seekg(offset, std::ios::beg);
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if (count == -1)
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ifs.seekg(0, std::ios::end);
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else
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ifs.seekg(count, std::ios::cur);
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std::ifstream::pos_type endpos = ifs.tellg();
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buffer.resize(endpos-startpos);
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ifs.seekg(offset, std::ios::beg);
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ifs.read((char*)&buffer[0], endpos-startpos);
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ifs.close();
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return ifs.good();
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}
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bool shared::write_file(const std::string& filename, bytes& buffer,
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bool truncate, std::streampos offset,
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std::streamsize count)
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{
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std::ios::openmode mode = std::ios::in|std::ios::out|std::ios::binary;
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if (truncate)
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mode |= std::ios::trunc;
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std::fstream ofs;
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ofs.open(filename.c_str(), mode);
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if (!ofs)
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{
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return false;
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}
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if (count == -1)
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count = buffer.size();
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else if (count > buffer.size())
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return false;
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ofs.seekg(offset, std::ios::beg);
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ofs.write((char*)&buffer[0], count);
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ofs.close();
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return ofs.good();
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}
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bool shared::file_exists(const std::string& filename)
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{
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std::ifstream ifs;
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ifs.open(filename.c_str(), std::ios::in);
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if (ifs.is_open())
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{
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ifs.close();
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return true;
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}
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return false;
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}
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bool shared::copy_file(const std::string& srcname, const std::string& dstname)
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{
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bytes buffer;
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if (!read_file(srcname, buffer))
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return false;
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return write_file(dstname, buffer, true);
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}
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bool shared::backup_file(const std::string& filename, bool force)
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{
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std::string backupname = filename + ".bak";
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if (!force)
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if (file_exists(backupname))
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return true;
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return copy_file(filename, backupname);
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}
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