/usr/include/dar/header_version.hpp is in libdar-dev 2.4.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2052 Denis Corbin
//
// 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.
//
// to contact the author : http://dar.linux.free.fr/email.html
/*********************************************************************/
/// \file header_version.hpp
/// \brief archive global header structure is defined here
/// \ingroup Private
#ifndef HEADER_LIBDAR_VERSION_HPP
#define HEADER_LIBDAR_VERSION_HPP
#include "/usr/include/dar/libdar_my_config.h"
#include "/usr/include/dar/infinint.hpp"
#include "/usr/include/dar/generic_file.hpp"
#include "/usr/include/dar/tools.hpp"
#include "/usr/include/dar/archive_version.hpp"
namespace libdar
{
/// \addtogroup Private
/// @{
const U_I LIBDAR_VERSION_FLAG_SAVED_EA_ROOT = 0x80; //< no more used since version "05"
const U_I LIBDAR_VERSION_FLAG_SAVED_EA_USER = 0x40; //< no more used since version "05"
const U_I LIBDAR_VERSION_FLAG_SCRAMBLED = 0x20; //< scrambled or strong encryption used
const U_I LIBDAR_VERSION_FLAG_SEQUENCE_MARK = 0x10; //< escape sequence marks present for sequential reading
const U_I LIBDAR_VERSION_FLAG_INITIAL_OFFSET = 0x08; //< whether the header contains the initial offset (size of clear data before encrypted) NOTE : This value is set internally by header_version, no need to set flag with it! But that's OK to set it or not, it will be updated according to initial_offset's value.
const U_I LIBDAR_VERSION_FLAG_HAS_AN_EXTENDED_SIZE = 0x01; //< reserved for future use
const U_I LIBDAR_VERSION_SIZE = 3; //< size of the version field
const U_I HEADER_CRC_SIZE = 2; //< size of the CRC (deprecated, now only used when reading old archives)
/// manages of the archive header and trailer
struct header_version
{
archive_version edition;
char algo_zip;
std::string cmd_line; // used long ago to store cmd_line, then abandonned, then recycled as a user comment field
unsigned char flag; // added at edition 02
infinint initial_offset; // not dropped to archive if set to zero (at dump() time, the flag is also updated with LIBDAR_VERSION_FLAG_INITIAL_OFFSET accordingly to this value)
header_version()
{
algo_zip = ' ';
cmd_line = "";
flag = 0;
initial_offset = 0;
}
void read(generic_file &f)
{
crc *ctrl = NULL;
f.reset_crc(HEADER_CRC_SIZE);
edition.read(f);
f.read(&algo_zip, sizeof(algo_zip));
tools_read_string(f, cmd_line);
if(edition > 1)
f.read((char *)&flag, 1);
else
flag = 0;
if((flag & LIBDAR_VERSION_FLAG_INITIAL_OFFSET) != 0)
initial_offset.read(f);
else
initial_offset = 0;
ctrl = f.get_crc();
if(ctrl == NULL)
throw SRC_BUG;
try
{
if((edition == empty_archive_version()))
throw Erange("header_version::read", gettext("Consistency check failed for archive header"));
if(edition > 7)
{
crc *coh = create_crc_from_file(f);
if(coh == NULL)
throw SRC_BUG;
try
{
if(typeid(*coh) != typeid(*ctrl))
{
if(coh->get_size() != ctrl->get_size())
throw SRC_BUG;
else
throw SRC_BUG; // both case lead to a bug, but we need to know which one is met
}
if(*coh != *ctrl)
throw Erange("header_version::read", gettext("Consistency check failed for archive header"));
}
catch(...)
{
if(coh != NULL)
delete coh;
throw;
}
if(coh != NULL)
delete coh;
}
if(initial_offset == 0)
initial_offset = f.get_position();
}
catch(...)
{
if(ctrl != NULL)
delete ctrl;
throw;
}
if(ctrl != NULL)
delete ctrl;
};
void write(generic_file &f)
{
crc *ctrl = NULL;
// preparing the data
if(initial_offset != 0)
flag |= LIBDAR_VERSION_FLAG_INITIAL_OFFSET; // adding it to the flag
else
flag &= ~LIBDAR_VERSION_FLAG_INITIAL_OFFSET; // removing it from the flag
// writing down the data
f.reset_crc(HEADER_CRC_SIZE);
edition.dump(f);
f.write(&algo_zip, sizeof(algo_zip));
tools_write_string(f, cmd_line);
f.write((char *)&flag, 1);
if(initial_offset != 0)
initial_offset.dump(f);
ctrl = f.get_crc();
if(ctrl == NULL)
throw SRC_BUG;
try
{
ctrl->dump(f);
}
catch(...)
{
if(ctrl != NULL)
delete ctrl;
throw;
}
if(ctrl != NULL)
delete ctrl;
};
};
} // end of namespace
#endif
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