void CriticalPacket::FinishPacket(const MD5Hash &setid)
{
assert(packetdata != 0 && packetlength >= sizeof(PACKET_HEADER));
PACKET_HEADER *header = (PACKET_HEADER*)packetdata;
header->setid = setid;
MD5Context packetcontext;
packetcontext.Update(&header->setid, packetlength - offsetof(PACKET_HEADER, setid));
packetcontext.Final(header->hash);
}
void DescriptionPacket::ComputeFileId(void)
{
FILEDESCRIPTIONPACKET *packet = ((FILEDESCRIPTIONPACKET *)packetdata);
// Compute the fileid from the hash, length, and name fields in the packet.
MD5Context context;
context.Update(&packet->hash16k,
sizeof(FILEDESCRIPTIONPACKET)-offsetof(FILEDESCRIPTIONPACKET,hash16k)
+strlen((const char*)packet->name));
context.Final(packet->fileid);
}
void Par2CreatorSourceFile::UpdateHashes(u32 blocknumber, const void *buffer, size_t length)
{
// Compute the crc and hash of the data
u32 blockcrc = ~0 ^ CRCUpdateBlock(~0, length, buffer);
MD5Context blockcontext;
blockcontext.Update(buffer, length);
MD5Hash blockhash;
blockcontext.Final(blockhash);
// Store the results in the verification packet
verificationpacket->SetBlockHashAndCRC(blocknumber, blockhash, blockcrc);
// Update the full file hash, but don't go beyond the end of the file
if ((u64)length > filesize - blocknumber * (u64)length)
{
length = (size_t)(filesize - blocknumber * (u64)length);
}
assert(contextfull != 0);
contextfull->Update(buffer, length);
}
bool CreatorPacket::Create(const MD5Hash &setid)
{
string creator = "Created by " PACKAGE " version " VERSION ".";
// Allocate a packet just large enough for creator name
CREATORPACKET *packet = (CREATORPACKET *)AllocatePacket(sizeof(*packet) + (~3 & (3+(u32)creator.size())));
// Fill in the details the we know
packet->header.magic = packet_magic;
packet->header.length = packetlength;
//packet->header.hash; // Compute shortly
packet->header.setid = setid;
packet->header.type = creatorpacket_type;
// Copy the creator description into the packet
memcpy(packet->client, creator.c_str(), creator.size());
// Compute the packet hash
MD5Context packetcontext;
packetcontext.Update(&packet->header.setid, packetlength - offsetof(PACKET_HEADER, setid));
packetcontext.Final(packet->header.hash);
return true;
}
bool MainPacket::Create(vector<Par2CreatorSourceFile*> &sourcefiles, u64 _blocksize)
{
recoverablefilecount = totalfilecount =(u32)sourcefiles.size();
blocksize = _blocksize;
// Allocate memory for the main packet with enough fileid entries
MAINPACKET *packet = (MAINPACKET *)AllocatePacket(sizeof(MAINPACKET) + totalfilecount * sizeof(MD5Hash));
// Record the details we already know in the packet
packet->header.magic = packet_magic;
packet->header.length = packetlength;
//packet->header.hash; // Compute shortly
//packet->header.setid; // Compute shortly
packet->header.type = mainpacket_type;
packet->blocksize = _blocksize;
packet->recoverablefilecount = totalfilecount;
//packet->fileid; // Compute shortly
// Sort the source files according to their fileid values
if (totalfilecount > 1)
{
sort(sourcefiles.begin(), sourcefiles.end(), Par2CreatorSourceFile::CompareLess);
}
// Store the fileid values in the main packet
vector<Par2CreatorSourceFile*>::const_iterator sourcefile;
MD5Hash *hash;
for ((sourcefile=sourcefiles.begin()),(hash=packet->fileid);
sourcefile!=sourcefiles.end();
++sourcefile, ++hash)
{
*hash = (*sourcefile)->FileId();
}
// Compute the set_id_hash
MD5Context setidcontext;
setidcontext.Update(&packet->blocksize, packetlength - offsetof(MAINPACKET, blocksize));
setidcontext.Final(packet->header.setid);
// Compute the packet_hash
MD5Context packetcontext;
packetcontext.Update(&packet->header.setid, packetlength - offsetof(MAINPACKET, header.setid));
packetcontext.Final(packet->header.hash);
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;
}
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;
}
parlist.push_back(filename);
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 Par2CreatorSourceFile::Open(CommandLine::NoiseLevel noiselevel, const CommandLine::ExtraFile &extrafile, u64 blocksize, bool deferhashcomputation, string basepath)
{
// Get the filename and filesize
diskfilename = extrafile.FileName();
filesize = extrafile.FileSize();
// Work out how many blocks the file will be sliced into
blockcount = (u32)((filesize + blocksize-1) / blocksize);
// Determine what filename to record in the PAR2 files
parfilename = diskfilename;
parfilename.erase(0, basepath.length());
// Create the Description and Verification packets
descriptionpacket = new DescriptionPacket;
descriptionpacket->Create(parfilename, filesize);
verificationpacket = new VerificationPacket;
verificationpacket->Create(blockcount);
// Create the diskfile object
diskfile = new DiskFile;
// Open the source file
if (!diskfile->Open(diskfilename, filesize))
return false;
// Do we want to defer the computation of the full file hash, and
// the block crc and hashes. This is only permitted if there
// is sufficient memory available to create all recovery blocks
// in one pass of the source files (i.e. chunksize == blocksize)
if (deferhashcomputation)
{
// Initialise a buffer to read the first 16k of the source file
size_t buffersize = 16 * 1024;
if (buffersize > filesize)
buffersize = (size_t)filesize;
char *buffer = new char[buffersize];
// Read the data from the file
if (!diskfile->Read(0, buffer, buffersize))
{
diskfile->Close();
delete [] buffer;
return false;
}
// Compute the hash of the data read from the file
MD5Context context;
context.Update(buffer, buffersize);
delete [] buffer;
MD5Hash hash;
context.Final(hash);
// Store the hash in the descriptionpacket and compute the file id
descriptionpacket->Hash16k(hash);
// Compute the fileid and store it in the verification packet.
descriptionpacket->ComputeFileId();
verificationpacket->FileId(descriptionpacket->FileId());
// Allocate an MD5 context for computing the file hash
// during the recovery data generation phase
contextfull = new MD5Context;
}
else
{
// Initialise a buffer to read the source file
size_t buffersize = 1024*1024;
if (buffersize > min(blocksize,filesize))
buffersize = (size_t)min(blocksize,filesize);
char *buffer = new char[buffersize];
// Get ready to start reading source file to compute the hashes and crcs
u64 offset = 0;
u32 blocknumber = 0;
u64 need = blocksize;
MD5Context filecontext;
MD5Context blockcontext;
u32 blockcrc = 0;
// Whilst we have not reached the end of the file
while (offset < filesize)
{
// Work out how much we can read
size_t want = (size_t)min(filesize-offset, (u64)buffersize);
// Read some data from the file into the buffer
if (!diskfile->Read(offset, buffer, want))
{
diskfile->Close();
delete [] buffer;
return false;
}
// If the new data passes the 16k boundary, compute the 16k hash for the file
if (offset < 16384 && offset + want >= 16384)
{
filecontext.Update(buffer, (size_t)(16384-offset));
MD5Context temp = filecontext;
MD5Hash hash;
temp.Final(hash);
// Store the 16k hash in the file description packet
descriptionpacket->Hash16k(hash);
if (offset + want > 16384)
{
filecontext.Update(&buffer[16384-offset], (size_t)(offset+want)-16384);
}
}
else
{
filecontext.Update(buffer, want);
}
// Get ready to update block hashes and crcs
u32 used = 0;
// Whilst we have not used all of the data we just read
while (used < want)
{
// How much of it can we use for the current block
u32 use = (u32)min(need, (u64)(want-used));
blockcrc = ~0 ^ CRCUpdateBlock(~0 ^ blockcrc, use, &buffer[used]);
blockcontext.Update(&buffer[used], use);
used += use;
need -= use;
// Have we finished the current block
if (need == 0)
{
MD5Hash blockhash;
blockcontext.Final(blockhash);
// Store the block hash and block crc in the file verification packet.
verificationpacket->SetBlockHashAndCRC(blocknumber, blockhash, blockcrc);
blocknumber++;
// More blocks
if (blocknumber < blockcount)
{
need = blocksize;
blockcontext.Reset();
blockcrc = 0;
}
}
}
if (noiselevel > CommandLine::nlQuiet)
{
// Display progress
u32 oldfraction = (u32)(1000 * offset / filesize);
u32 newfraction = (u32)(1000 * (offset + want) / filesize);
if (oldfraction != newfraction)
{
cout << newfraction/10 << '.' << newfraction%10 << "%\r" << flush;
}
}
offset += want;
}
// Did we finish the last block
if (need > 0)
{
blockcrc = ~0 ^ CRCUpdateBlock(~0 ^ blockcrc, (size_t)need);
blockcontext.Update((size_t)need);
MD5Hash blockhash;
blockcontext.Final(blockhash);
// Store the block hash and block crc in the file verification packet.
verificationpacket->SetBlockHashAndCRC(blocknumber, blockhash, blockcrc);
blocknumber++;
need = 0;
}
// Finish computing the file hash.
MD5Hash filehash;
filecontext.Final(filehash);
// Store the file hash in the file description packet.
descriptionpacket->HashFull(filehash);
// Did we compute the 16k hash.
if (offset < 16384)
{
// Store the 16k hash in the file description packet.
descriptionpacket->Hash16k(filehash);
}
delete [] buffer;
// Compute the fileid and store it in the verification packet.
descriptionpacket->ComputeFileId();
verificationpacket->FileId(descriptionpacket->FileId());
}
return true;
}
