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par1repairer.cpp
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par1repairer.cpp
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// This file is part of par2cmdline (a PAR 2.0 compatible file verification and
// repair tool). See http://parchive.sourceforge.net for details of PAR 2.0.
//
// Copyright (c) 2003 Peter Brian Clements
//
// par2cmdline 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.
//
// par2cmdline 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 "par2cmdline.h"
#ifdef _MSC_VER
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
#endif
static u32 smartpar11 = 0x03000101;
Par1Repairer::Par1Repairer(void)
{
filelist = 0;
filelistsize = 0;
blocksize = 0;
completefilecount = 0;
renamedfilecount = 0;
damagedfilecount = 0;
missingfilecount = 0;
//inputbuffer = 0;
outputbuffer = 0;
noiselevel = CommandLine::nlNormal;
}
Par1Repairer::~Par1Repairer(void)
{
map<u32,DataBlock*>::iterator i = recoveryblocks.begin();
while (i != recoveryblocks.end())
{
DataBlock *datablock = i->second;
delete datablock;
++i;
}
vector<Par1RepairerSourceFile*>::iterator sourceiterator = sourcefiles.begin();
while (sourceiterator != sourcefiles.end())
{
Par1RepairerSourceFile *sourcefile = *sourceiterator;
delete sourcefile;
++sourceiterator;
}
sourceiterator = extrafiles.begin();
while (sourceiterator != extrafiles.end())
{
Par1RepairerSourceFile *sourcefile = *sourceiterator;
delete sourcefile;
++sourceiterator;
}
delete [] filelist;
}
Result Par1Repairer::Process(const CommandLine &commandline, bool dorepair)
{
// How noisy should we be
noiselevel = commandline.GetNoiseLevel();
// Get filesnames from the command line
string par1filename = commandline.GetParFilename();
const list<CommandLine::ExtraFile> &extrafiles = commandline.GetExtraFiles();
// Determine the searchpath from the location of the main PAR file
string name;
DiskFile::SplitFilename(par1filename, searchpath, name);
// Load the main PAR file
if (!LoadRecoveryFile(searchpath + name))
return eLogicError;
// Load other PAR files related to the main PAR file
if (!LoadOtherRecoveryFiles(par1filename))
return eLogicError;
// Load any extra PAR files specified on the command line
if (!LoadExtraRecoveryFiles(extrafiles))
return eLogicError;
if (noiselevel > CommandLine::nlQuiet)
cout << endl << "Verifying source files:" << endl << endl;
// Check for the existence of and verify each of the source files
if (!VerifySourceFiles())
return eFileIOError;
if (completefilecount<sourcefiles.size())
{
if (noiselevel > CommandLine::nlQuiet)
cout << endl << "Scanning extra files:" << endl << endl;
// Check any other files specified on the command line to see if they are
// actually copies of the source files that have the wrong filename
if (!VerifyExtraFiles(extrafiles))
return eLogicError;
}
// Find out how much data we have found
UpdateVerificationResults();
if (noiselevel > CommandLine::nlSilent)
cout << endl;
// Check the verification results and report the details
if (!CheckVerificationResults())
return eRepairNotPossible;
// Are any of the files incomplete
if (completefilecount<sourcefiles.size())
{
// Do we want to carry out a repair
if (dorepair)
{
if (noiselevel > CommandLine::nlSilent)
cout << endl;
// Rename any damaged or missnamed target files.
if (!RenameTargetFiles())
return eFileIOError;
// Are we still missing any files
if (completefilecount<sourcefiles.size())
{
// Work out which files are being repaired, create them, and allocate
// target DataBlocks to them, and remember them for later verification.
if (!CreateTargetFiles())
return eFileIOError;
// Work out which data blocks are available, which need to be recreated,
// and compute the appropriate Reed Solomon matrix.
if (!ComputeRSmatrix())
{
// Delete all of the partly reconstructed files
DeleteIncompleteTargetFiles();
return eFileIOError;
}
// Allocate memory buffers for reading and writing data to disk.
if (!AllocateBuffers(commandline.GetMemoryLimit()))
{
// Delete all of the partly reconstructed files
DeleteIncompleteTargetFiles();
return eMemoryError;
}
if (noiselevel > CommandLine::nlSilent)
cout << endl;
// Set the total amount of data to be processed.
progress = 0;
totaldata = blocksize * sourcefiles.size() * verifylist.size();
// Start at an offset of 0 within a block.
u64 blockoffset = 0;
while (blockoffset < blocksize) // Continue until the end of the block.
{
// Work out how much data to process this time.
size_t blocklength = (size_t)min((u64)chunksize, blocksize-blockoffset);
// Read source data, process it through the RS matrix and write it to disk.
if (!ProcessData(blockoffset, blocklength))
{
// Delete all of the partly reconstructed files
DeleteIncompleteTargetFiles();
return eFileIOError;
}
// Advance to the need offset within each block
blockoffset += blocklength;
}
if (noiselevel > CommandLine::nlSilent)
cout << endl << "Verifying repaired files:" << endl << endl;
// Verify that all of the reconstructed target files are now correct
if (!VerifyTargetFiles())
{
// Delete all of the partly reconstructed files
DeleteIncompleteTargetFiles();
return eFileIOError;
}
}
// Are all of the target files now complete?
if (completefilecount<sourcefiles.size())
{
cerr << "Repair Failed." << endl;
return eRepairFailed;
}
else
{
if (noiselevel > CommandLine::nlSilent)
cout << endl << "Repair complete." << endl;
}
}
else
{
return eRepairPossible;
}
}
return eSuccess;
}
bool Par1Repairer::LoadRecoveryFile(string filename)
{
// Skip the file if it has already been processed
if (diskfilemap.Find(filename) != 0)
{
return true;
}
DiskFile *diskfile = new DiskFile;
// Open the file
if (!diskfile->Open(filename))
{
// If we could not open the file, ignore the error and
// proceed to the next file
delete diskfile;
return true;
}
if (noiselevel > CommandLine::nlSilent)
{
string path;
string name;
DiskFile::SplitFilename(filename, path, name);
cout << "Loading \"" << name << "\"." << endl;
}
bool havevolume = false;
u32 volumenumber = 0;
// How big is the file
u64 filesize = diskfile->FileSize();
if (filesize >= sizeof(PAR1FILEHEADER))
{
// Allocate a buffer to read data into
size_t buffersize = (size_t)min((u64)1048576, filesize);
u8 *buffer = new u8[buffersize];
do
{
PAR1FILEHEADER fileheader;
if (!diskfile->Read(0, &fileheader, sizeof(fileheader)))
break;
// Is this really a PAR file?
if (fileheader.magic != par1_magic)
break;
// Is the version number correct?
if (fileheader.fileversion != 0x00010000)
break;
ignore16kfilehash = (fileheader.programversion == smartpar11);
// Prepare to carry out MD5 Hash check of the Control Hash
MD5Context context;
u64 offset = offsetof(PAR1FILEHEADER, sethash);
// Process until the end of the file is reached
while (offset < filesize)
{
// How much data should we read?
size_t want = (size_t)min((u64)buffersize, filesize-offset);
if (!diskfile->Read(offset, buffer, want))
break;
context.Update(buffer, want);
offset += want;
}
// Did we read the whole file
if (offset < filesize)
break;
// Compute the hash value
MD5Hash hash;
context.Final(hash);
// Is it correct?
if (hash != fileheader.controlhash)
break;
// Check that the volume number is ok
if (fileheader.volumenumber >= 256)
break;
// Are there any files?
if (fileheader.numberoffiles == 0 ||
fileheader.filelistoffset < sizeof(PAR1FILEHEADER) ||
fileheader.filelistsize == 0)
break;
// Verify that the file list and data offsets are ok
if ((fileheader.filelistoffset + fileheader.filelistsize > filesize)
||
(fileheader.datasize && (fileheader.dataoffset < sizeof(fileheader) || fileheader.dataoffset + fileheader.datasize > filesize))
||
(fileheader.datasize && (fileheader.filelistoffset <= fileheader.dataoffset && fileheader.dataoffset < fileheader.filelistoffset+fileheader.filelistsize || fileheader.dataoffset <= fileheader.filelistoffset && fileheader.filelistoffset < fileheader.dataoffset + fileheader.datasize)))
break;
// Check the size of the file list
if (fileheader.filelistsize > 200000)
break;
// If we already have a copy of the file list, make sure this one has the same size
if (filelist != 0 && filelistsize != fileheader.filelistsize)
break;
// Allocate a buffer to hold a copy of the file list
unsigned char *temp = new unsigned char[(size_t)fileheader.filelistsize];
// Read the file list into the buffer
if (!diskfile->Read(fileheader.filelistoffset, temp, (size_t)fileheader.filelistsize))
{
delete [] temp;
break;
}
// If we already have a copy of the file list, make sure this copy is identical
if (filelist != 0)
{
bool match = (0 == memcmp(filelist, temp, filelistsize));
delete [] temp;
if (!match)
break;
}
else
{
// Prepare to scan the file list
unsigned char *current = temp;
size_t remaining = (size_t)fileheader.filelistsize;
unsigned int fileindex = 0;
// Allocate a buffer to copy each file entry into so that
// all fields will be correctly aligned in memory.
PAR1FILEENTRY *fileentry = (PAR1FILEENTRY*)new u64[(remaining + sizeof(u64)-1)/sizeof(u64)];
// Process until we run out of files or data
while (remaining > 0 && fileindex < fileheader.numberoffiles)
{
// Copy fixed portion of file entry
memcpy((void*)fileentry, (void*)current, sizeof(PAR1FILEENTRY));
// Is there enough data remaining
if (remaining < sizeof(fileentry->entrysize) ||
remaining < fileentry->entrysize)
break;
// Check the length of the filename
if (fileentry->entrysize <= sizeof(PAR1FILEENTRY))
break;
// Check the file size
if (blocksize < fileentry->filesize)
blocksize = fileentry->filesize;
// Copy whole of file entry
memcpy((void*)fileentry, (void*)current, (size_t)(u64)fileentry->entrysize);
// Create source file and add it to the appropriate list
Par1RepairerSourceFile *sourcefile = new Par1RepairerSourceFile(fileentry, searchpath);
if (fileentry->status & INPARITYVOLUME)
{
sourcefiles.push_back(sourcefile);
}
else
{
extrafiles.push_back(sourcefile);
}
remaining -= (size_t)fileentry->entrysize;
current += (size_t)fileentry->entrysize;
fileindex++;
}
delete [] (u64*)fileentry;
// Did we find the correct number of files
if (fileindex < fileheader.numberoffiles)
{
vector<Par1RepairerSourceFile*>::iterator i = sourcefiles.begin();
while (i != sourcefiles.end())
{
Par1RepairerSourceFile *sourcefile = *i;
delete sourcefile;
++i;
}
sourcefiles.clear();
i = extrafiles.begin();
while (i != extrafiles.end())
{
Par1RepairerSourceFile *sourcefile = *i;
delete sourcefile;
++i;
}
extrafiles.clear();
delete [] temp;
break;
}
filelist = temp;
filelistsize = (u32)fileheader.filelistsize;
}
// Is this a recovery volume?
if (fileheader.volumenumber > 0)
{
// Make sure there is data and that it is the correct size
if (fileheader.dataoffset == 0 || fileheader.datasize != blocksize)
break;
// What volume number is this?
volumenumber = (u32)(fileheader.volumenumber - 1);
// Do we already have this volume?
if (recoveryblocks.find(volumenumber) == recoveryblocks.end())
{
// Create a data block
DataBlock *datablock = new DataBlock;
datablock->SetLength(blocksize);
datablock->SetLocation(diskfile, fileheader.dataoffset);
// Store it in the map
recoveryblocks.insert(pair<u32, DataBlock*>(volumenumber, datablock));
havevolume = true;
}
}
} while (false);
delete [] buffer;
}
// We have finished with the file for now
diskfile->Close();
if (noiselevel > CommandLine::nlQuiet)
{
if (havevolume)
{
cout << "Loaded recovery volume " << volumenumber << endl;
}
else
{
cout << "No new recovery volumes found" << endl;
}
}
// Remember that the file was processed
bool success = diskfilemap.Insert(diskfile);
assert(success);
return true;
}
bool Par1Repairer::LoadOtherRecoveryFiles(string filename)
{
// Split the original PAR filename into path and name parts
string path;
string name;
DiskFile::SplitFilename(filename, path, name);
// Find the file extension
string::size_type where = name.find_last_of('.');
if (where != string::npos)
{
// remove it
name = name.substr(0, where);
}
// Search for additional PAR files
string wildcard = name + ".???";
list<string> *files = DiskFile::FindFiles(path, wildcard);
for (list<string>::const_iterator s=files->begin(); s!=files->end(); ++s)
{
string filename = *s;
// Find the file extension
where = filename.find_last_of('.');
if (where != string::npos)
{
string tail = filename.substr(where+1);
// Check the the file extension is the correct form
if ((tail[0] == 'P' || tail[0] == 'p') &&
(
(tail[1] == 'A' || tail[1] == 'a') && (tail[2] == 'R' || tail[2] == 'r')
||
isdigit(tail[1]) && isdigit(tail[2])
))
{
LoadRecoveryFile(filename);
}
}
}
delete files;
return true;
}
// Load packets from any other PAR files whose names are given on the command line
bool Par1Repairer::LoadExtraRecoveryFiles(const list<CommandLine::ExtraFile> &extrafiles)
{
for (ExtraFileIterator i=extrafiles.begin(); i!=extrafiles.end(); i++)
{
string filename = i->FileName();
// Find the file extension
string::size_type where = filename.find_last_of('.');
if (where != string::npos)
{
string tail = filename.substr(where+1);
// Check the the file extension is the correct form
if ((tail[0] == 'P' || tail[0] == 'p') &&
(
(tail[1] == 'A' || tail[1] == 'a') && (tail[2] == 'R' || tail[2] == 'r')
||
isdigit(tail[1]) && isdigit(tail[2])
))
{
LoadRecoveryFile(filename);
}
}
}
return true;
}
// Attempt to verify all of the source files
bool Par1Repairer::VerifySourceFiles(void)
{
bool finalresult = true;
u32 filenumber = 0;
vector<Par1RepairerSourceFile*>::iterator sourceiterator = sourcefiles.begin();
while (sourceiterator != sourcefiles.end())
{
Par1RepairerSourceFile *sourcefile = *sourceiterator;
string filename = sourcefile->FileName();
// Check to see if we have already used this file
if (diskfilemap.Find(filename) != 0)
{
// The file has already been used!
cerr << "Source file " << filenumber+1 << " is a duplicate." << endl;
return false;
}
DiskFile *diskfile = new DiskFile;
// Does the target file exist
if (diskfile->Open(filename))
{
// Yes. Record that fact.
sourcefile->SetTargetExists(true);
// Remember that the DiskFile is the target file
sourcefile->SetTargetFile(diskfile);
// Remember that we have processed this file
bool success = diskfilemap.Insert(diskfile);
assert(success);
// Do the actual verification
if (!VerifyDataFile(diskfile, sourcefile))
finalresult = false;
// We have finished with the file for now
diskfile->Close();
// Find out how much data we have found
UpdateVerificationResults();
}
else
{
// The file does not exist.
delete diskfile;
if (noiselevel > CommandLine::nlSilent)
{
string path;
string name;
DiskFile::SplitFilename(filename, path, name);
cout << "Target: \"" << name << "\" - missing." << endl;
}
}
++sourceiterator;
++filenumber;
}
return finalresult;
}
// Scan any extra files specified on the command line
bool Par1Repairer::VerifyExtraFiles(const list<CommandLine::ExtraFile> &extrafiles)
{
for (ExtraFileIterator i=extrafiles.begin();
i!=extrafiles.end() && completefilecount<sourcefiles.size();
++i)
{
string filename = i->FileName();
bool skip = false;
// Find the file extension
string::size_type where = filename.find_last_of('.');
if (where != string::npos)
{
string tail = filename.substr(where+1);
// Check the the file extension is the correct form
if ((tail[0] == 'P' || tail[0] == 'p') &&
(
(tail[1] == 'A' || tail[1] == 'a') && (tail[2] == 'R' || tail[2] == 'r')
||
isdigit(tail[1]) && isdigit(tail[2])
))
{
skip = true;
}
}
if (!skip)
{
filename = DiskFile::GetCanonicalPathname(filename);
// Has this file already been dealt with
if (diskfilemap.Find(filename) == 0)
{
DiskFile *diskfile = new DiskFile;
// Does the file exist
if (!diskfile->Open(filename))
{
delete diskfile;
continue;
}
// Remember that we have processed this file
bool success = diskfilemap.Insert(diskfile);
assert(success);
// Do the actual verification
VerifyDataFile(diskfile, 0);
// Ignore errors
// We have finished with the file for now
diskfile->Close();
// Find out how much data we have found
UpdateVerificationResults();
}
}
}
return true;
}
bool Par1Repairer::VerifyDataFile(DiskFile *diskfile, Par1RepairerSourceFile *sourcefile)
{
Par1RepairerSourceFile *match = 0;
string path;
string name;
DiskFile::SplitFilename(diskfile->FileName(), path, name);
// How big is the file we are checking
u64 filesize = diskfile->FileSize();
if (filesize == 0)
{
if (noiselevel > CommandLine::nlSilent)
{
cout << "Target: \"" << name << "\" - empty." << endl;
}
return true;
}
// Search for the first file that is the correct size
vector<Par1RepairerSourceFile*>::iterator sourceiterator = sourcefiles.begin();
while (sourceiterator != sourcefiles.end() &&
filesize != (*sourceiterator)->FileSize())
{
++sourceiterator;
}
// Are there any files that are the correct size?
if (sourceiterator != sourcefiles.end())
{
// Allocate a buffer to compute the file hash
size_t buffersize = (size_t)min((u64)1048576, filesize);
char *buffer = new char[buffersize];
// Read the first 16k of the file
size_t want = (size_t)min((u64)16384, filesize);
if (!diskfile->Read(0, buffer, want))
{
delete [] buffer;
return false;
}
// Compute the MD5 hash of the first 16k
MD5Context contextfull;
contextfull.Update(buffer, want);
MD5Context context16k = contextfull;
MD5Hash hash16k;
context16k.Final(hash16k);
if (!ignore16kfilehash)
{
// Search for the first file that has the correct 16k hash
while (sourceiterator != sourcefiles.end() &&
(filesize != (*sourceiterator)->FileSize() ||
hash16k != (*sourceiterator)->Hash16k()))
{
++sourceiterator;
}
}
// Are there any files with the correct 16k hash?
if (sourceiterator != sourcefiles.end())
{
// Compute the MD5 hash of the whole file
if (filesize > 16384)
{
u64 progress = 0;
u64 offset = 16384;
while (offset < filesize)
{
if (noiselevel > CommandLine::nlQuiet)
{
// Update a progress indicator
u32 oldfraction = (u32)(1000 * (progress) / filesize);
u32 newfraction = (u32)(1000 * (progress=offset) / filesize);
if (oldfraction != newfraction)
{
cout << "Scanning: \"" << name << "\": " << newfraction/10 << '.' << newfraction%10 << "%\r" << flush;
}
}
want = (size_t)min((u64)buffersize, filesize-offset);
if (!diskfile->Read(offset, buffer, want))
{
delete [] buffer;
return false;
}
contextfull.Update(buffer, want);
offset += want;
}
}
MD5Hash hashfull;
contextfull.Final(hashfull);
// Search for the first file that has the correct full hash
while (sourceiterator != sourcefiles.end() &&
(filesize != (*sourceiterator)->FileSize() ||
(!ignore16kfilehash && hash16k != (*sourceiterator)->Hash16k()) ||
hashfull != (*sourceiterator)->HashFull()))
{
++sourceiterator;
}
// Are there any files with the correct full hash?
if (sourceiterator != sourcefiles.end())
{
// If a source file was originally specified, check to see if it is a match
if (sourcefile != 0 &&
sourcefile->FileSize() == filesize &&
(ignore16kfilehash || sourcefile->Hash16k() == hash16k) &&
sourcefile->HashFull() == hashfull)
{
match = sourcefile;
}
else
{
// Search for a file which matches and has not already been matched
while (sourceiterator != sourcefiles.end() &&
(filesize != (*sourceiterator)->FileSize() ||
(!ignore16kfilehash && hash16k != (*sourceiterator)->Hash16k()) ||
hashfull != (*sourceiterator)->HashFull() ||
(*sourceiterator)->GetCompleteFile() != 0))
{
++sourceiterator;
}
// Did we find a match
if (sourceiterator != sourcefiles.end())
{
match = *sourceiterator;
}
}
}
}
delete [] buffer;
}
// Did we find a match
if (match != 0)
{
match->SetCompleteFile(diskfile);
if (noiselevel > CommandLine::nlSilent)
{
// Was the match the file we were originally looking for
if (match == sourcefile)
{
cout << "Target: \"" << name << "\" - found." << endl;
}
// Were we looking for a specific file
else if (sourcefile != 0)
{
string targetname;
DiskFile::SplitFilename(sourcefile->FileName(), path, targetname);
cout << "Target: \""
<< name
<< "\" - is a match for \""
<< targetname
<< "\"."
<< endl;
}
}
else
{
if (noiselevel > CommandLine::nlSilent)
{
string targetname;
DiskFile::SplitFilename(match->FileName(), path, targetname);
cout << "File: \""
<< name
<< "\" - is a match for \""
<< targetname
<< "\"."
<< endl;
}
}
}
else
{
if (noiselevel > CommandLine:: nlSilent)
cout << "File: \""
<< name
<< "\" - no data found."
<< endl;
}
return true;
}
void Par1Repairer::UpdateVerificationResults(void)
{
completefilecount = 0;
renamedfilecount = 0;
damagedfilecount = 0;
missingfilecount = 0;
vector<Par1RepairerSourceFile*>::iterator sf = sourcefiles.begin();
// Check the recoverable files
while (sf != sourcefiles.end())
{
Par1RepairerSourceFile *sourcefile = *sf;
// Was a perfect match for the file found
if (sourcefile->GetCompleteFile() != 0)
{
// Is it the target file or a different one
if (sourcefile->GetCompleteFile() == sourcefile->GetTargetFile())
{
completefilecount++;
}
else
{
renamedfilecount++;
}
}
else
{
// Does the target file exist
if (sourcefile->GetTargetExists())
{
damagedfilecount++;
}
else
{
missingfilecount++;
}
}
++sf;
}
}
bool Par1Repairer::CheckVerificationResults(void)
{
// Is repair needed
if (completefilecount < sourcefiles.size() ||
renamedfilecount > 0 ||
damagedfilecount > 0 ||
missingfilecount > 0)
{
if (noiselevel > CommandLine::nlSilent)
cout << "Repair is required." << endl;
if (noiselevel > CommandLine::nlQuiet)
{
if (renamedfilecount > 0) cout << renamedfilecount << " file(s) have the wrong name." << endl;
if (missingfilecount > 0) cout << missingfilecount << " file(s) are missing." << endl;
if (damagedfilecount > 0) cout << damagedfilecount << " file(s) exist but are damaged." << endl;
if (completefilecount > 0) cout << completefilecount << " file(s) are ok." << endl;
}
// Is repair possible
if (recoveryblocks.size() >= damagedfilecount+missingfilecount)
{
if (noiselevel > CommandLine::nlSilent)
cout << "Repair is possible." << endl;
if (noiselevel > CommandLine::nlQuiet)
{
if (recoveryblocks.size() > damagedfilecount+missingfilecount)
cout << "You have an excess of "
<< (u32)recoveryblocks.size() - (damagedfilecount+missingfilecount)
<< " recovery files." << endl;
if (damagedfilecount+missingfilecount > 0)
cout << damagedfilecount+missingfilecount
<< " recovery files will be used to repair." << endl;
else if (recoveryblocks.size())
cout << "None of the recovery files will be used for the repair." << endl;
}
return true;
}
else
{
if (noiselevel > CommandLine::nlSilent)
{
cout << "Repair is not possible." << endl;
cout << "You need " << damagedfilecount+missingfilecount - recoveryblocks.size()
<< " more recovery files to be able to repair." << endl;
}
return false;
}
}
else
{
if (noiselevel > CommandLine::nlSilent)
cout << "All files are correct, repair is not required." << endl;
return true;
}