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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2023-2025 Antonio Diaz Diaz.
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, see <http://www.gnu.org/licenses/>.
*/
#define _FILE_OFFSET_BITS 64
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <list>
#include <string>
#include <vector>
#include <dirent.h>
#include <stdint.h>
#include <sys/stat.h>
#include "lzip.h"
#include "md5.h"
#include "fec.h"
namespace {
// Return true if full_name is a regular file or (a link to) a directory.
bool test_full_name( const std::string & full_name, const struct stat * stp,
const bool follow )
{
struct stat st, st2;
if( ( follow && stat( full_name.c_str(), &st ) != 0 ) ||
( !follow && lstat( full_name.c_str(), &st ) != 0 ) ) return false;
if( S_ISREG( st.st_mode ) ) return true;
if( !S_ISDIR( st.st_mode ) ) return false;
std::string prev_dir( full_name );
bool loop = stp && st.st_ino == stp->st_ino && st.st_dev == stp->st_dev;
if( !loop )
for( unsigned i = prev_dir.size(); i > 1; )
{
while( i > 0 && prev_dir[i-1] != '/' ) --i;
if( i == 0 ) break;
if( i > 1 ) --i; // remove trailing slash except at root dir
prev_dir.resize( i );
if( stat( prev_dir.c_str(), &st2 ) != 0 || !S_ISDIR( st2.st_mode ) ||
( st.st_ino == st2.st_ino && st.st_dev == st2.st_dev ) )
{ loop = true; break; }
}
if( loop ) // full_name already visited or above tree
show_file_error( full_name.c_str(), "warning: recursive directory loop." );
return !loop; // (link to) directory
}
bool ignore_name( const std::string & name )
{
if( name == "." || name == ".." || name == "fec" || name == "FEC" ||
has_fec_extension( name ) ) return true;
return name.size() > 3 && name.compare( name.size() - 3, 3, "fec" ) == 0 &&
( name.end()[-4] == '-' || name.end()[-4] == '.' ||
name.end()[-4] == '_' );
}
} // end namespace
/* Return in input_filename the next file name. ('-' is a valid file name).
Ignore recursively found files and directories named "fec" or "*[-._]fec".
Set 'retval' to 1 if a directory fails to open. */
bool next_filename( std::list< std::string > & filelist,
std::string & input_filename, int & retval,
const char recursive )
{
while( !filelist.empty() )
{
input_filename = filelist.front();
filelist.pop_front();
struct stat st;
if( stat( input_filename.c_str(), &st ) == 0 && S_ISDIR( st.st_mode ) )
{
if( recursive )
{
DIR * const dirp = opendir( input_filename.c_str() );
if( !dirp )
{
show_file_error( input_filename.c_str(), "Can't open directory", errno );
if( retval == 0 ) { retval = 1; } continue;
}
for( unsigned i = input_filename.size();
i > 1 && input_filename[i-1] == '/'; --i )
input_filename.resize( i - 1 ); // remove trailing slashes
struct stat stdot, *stdotp = 0;
if( input_filename[0] != '/' ) // relative file name
{
if( input_filename == "." ) input_filename.clear();
if( stat( ".", &stdot ) == 0 && S_ISDIR( stdot.st_mode ) )
stdotp = &stdot;
}
if( input_filename.size() && input_filename != "/" )
input_filename += '/';
std::list< std::string > tmp_list;
while( true )
{
const struct dirent * const entryp = readdir( dirp );
if( !entryp ) { closedir( dirp ); break; }
const std::string tmp_name( entryp->d_name );
if( ignore_name( tmp_name ) ) continue;
const std::string full_name( input_filename + tmp_name );
if( test_full_name( full_name, stdotp, recursive == 2 ) )
tmp_list.push_back( full_name );
}
filelist.splice( filelist.begin(), tmp_list );
}
continue;
}
return true;
}
input_filename.clear();
return false;
}
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