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/* zenutils - Utilities for working with creative firmwares.
* Copyright 2007 (c) Rasmus Ry <rasmus.ry{at}gmail.com>
*
* 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 2 of the License, 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, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "file.h"
#include <fstream>
bool shared::read_file(const std::string& filename, bytes& buffer,
std::streampos offset, std::streamsize count)
{
std::ifstream ifs;
ifs.open(filename.c_str(), std::ios::binary);
if (!ifs)
{
return false;
}
std::ifstream::pos_type startpos = offset;
ifs.seekg(offset, std::ios::beg);
if (count == -1)
ifs.seekg(0, std::ios::end);
else
ifs.seekg(count, std::ios::cur);
std::ifstream::pos_type endpos = ifs.tellg();
buffer.resize(endpos-startpos);
ifs.seekg(offset, std::ios::beg);
ifs.read((char*)&buffer[0], endpos-startpos);
ifs.close();
return ifs.good();
}
bool shared::write_file(const std::string& filename, bytes& buffer,
bool truncate, std::streampos offset,
std::streamsize count)
{
std::ios::openmode mode = std::ios::in|std::ios::out|std::ios::binary;
if (truncate)
mode |= std::ios::trunc;
std::fstream ofs;
ofs.open(filename.c_str(), mode);
if (!ofs)
{
return false;
}
if (count == -1)
count = buffer.size();
else if (count > buffer.size())
return false;
ofs.seekg(offset, std::ios::beg);
ofs.write((char*)&buffer[0], count);
ofs.close();
return ofs.good();
}
bool shared::file_exists(const std::string& filename)
{
std::ifstream ifs;
ifs.open(filename.c_str(), std::ios::in);
if (ifs.is_open())
{
ifs.close();
return true;
}
return false;
}
bool shared::copy_file(const std::string& srcname, const std::string& dstname)
{
bytes buffer;
if (!read_file(srcname, buffer))
return false;
return write_file(dstname, buffer, true);
}
bool shared::backup_file(const std::string& filename, bool force)
{
std::string backupname = filename + ".bak";
if (!force)
if (file_exists(backupname))
return true;
return copy_file(filename, backupname);
}
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