public ZipReturn ZipFileOpen(string newFilename, long timestamp, bool readHeaders)
{
ZipFileClose();
_pZipStatus = ZipStatus.None;
_zip64 = false;
_centerDirStart = 0;
_centerDirSize = 0;
_zipFileInfo = null;
try
{
if (!IO.File.Exists(newFilename))
{
ZipFileClose();
return ZipReturn.ZipErrorFileNotFound;
}
_zipFileInfo = new IO.FileInfo(newFilename);
if (_zipFileInfo.LastWriteTime != timestamp)
{
ZipFileClose();
return ZipReturn.ZipErrorTimeStamp;
}
int errorCode = IO.FileStream.OpenFileRead(newFilename, out _zipFs);
if (errorCode != 0)
{
ZipFileClose();
if (errorCode == 32)
return ZipReturn.ZipFileLocked;
return ZipReturn.ZipErrorOpeningFile;
}
}
catch (PathTooLongException)
{
ZipFileClose();
return ZipReturn.ZipFileNameToLong;
}
catch (IOException)
{
ZipFileClose();
return ZipReturn.ZipErrorOpeningFile;
}
ZipOpen = ZipOpenType.OpenRead;
if (!readHeaders)
return ZipReturn.ZipGood;
try
{
ZipReturn zRet = FindEndOfCentralDirSignature();
if (zRet != ZipReturn.ZipGood)
{
ZipFileClose();
return zRet;
}
long endOfCentralDir = _zipFs.Position;
zRet = EndOfCentralDirRead();
if (zRet != ZipReturn.ZipGood)
{
ZipFileClose();
return zRet;
}
// check if this is a ZIP64 zip and if it is read the Zip64 End Of Central Dir Info
if (_centerDirStart == 0xffffffff || _centerDirSize == 0xffffffff || _localFilesCount == 0xffff)
{
_zip64 = true;
_zipFs.Position = endOfCentralDir - 20;
zRet = Zip64EndOfCentralDirectoryLocatorRead();
if (zRet != ZipReturn.ZipGood)
{
ZipFileClose();
return zRet;
}
_zipFs.Position = (long)_endOfCenterDir64;
zRet = Zip64EndOfCentralDirRead();
if (zRet != ZipReturn.ZipGood)
{
ZipFileClose();
return zRet;
}
}
bool trrntzip = false;
// check if the ZIP has a valid TorrentZip file comment
if (_fileComment.Length == 22)
{
if (GetString(_fileComment).Substring(0, 14) == "TORRENTZIPPED-")
{
CrcCalculatorStream crcCs = new CrcCalculatorStream(_zipFs, true);
byte[] buffer = new byte[_centerDirSize];
_zipFs.Position = (long)_centerDirStart;
crcCs.Read(buffer, 0, (int)_centerDirSize);
crcCs.Flush();
crcCs.Close();
uint r = (uint)crcCs.Crc;
crcCs.Dispose();
string tcrc = GetString(_fileComment).Substring(14, 8);
string zcrc = r.ToString("X8");
if (String.Compare(tcrc, zcrc, StringComparison.Ordinal) == 0)
trrntzip = true;
}
}
// now read the central directory
_zipFs.Position = (long)_centerDirStart;
_localFiles.Clear();
_localFiles.Capacity = (int)_localFilesCount;
for (int i = 0; i < _localFilesCount; i++)
{
LocalFile lc = new LocalFile(_zipFs);
zRet = lc.CenteralDirectoryRead();
if (zRet != ZipReturn.ZipGood)
{
ZipFileClose();
return zRet;
}
_zip64 |= lc.Zip64;
_localFiles.Add(lc);
}
for (int i = 0; i < _localFilesCount; i++)
{
zRet = _localFiles[i].LocalFileHeaderRead();
if (zRet != ZipReturn.ZipGood)
{
ZipFileClose();
return zRet;
}
trrntzip &= _localFiles[i].TrrntZip;
}
// check trrntzip file order
if (trrntzip)
for (int i = 0; i < _localFilesCount - 1; i++)
{
if (TrrntZipStringCompare(_localFiles[i].FileName, _localFiles[i + 1].FileName) < 0) continue;
trrntzip = false;
break;
}
// check trrntzip directories
if (trrntzip)
for (int i = 0; i < _localFilesCount - 1; i++)
{
// see if we found a directory
string filename0 = _localFiles[i].FileName;
if (filename0.Substring(filename0.Length - 1, 1) != "/") continue;
// see if the next file is in that directory
string filename1 = _localFiles[i + 1].FileName;
if (filename1.Length <= filename0.Length) continue;
if (TrrntZipStringCompare(filename0, filename1.Substring(0, filename0.Length)) != 0) continue;
// if we found a file in the directory then we do not need the directory entry
trrntzip = false;
break;
}
if (trrntzip)
_pZipStatus |= ZipStatus.TrrntZip;
return ZipReturn.ZipGood;
}
catch
{
ZipFileClose();
return ZipReturn.ZipErrorReadingFile;
}
}
public void ZipFileClose()
{
if (ZipOpen == ZipOpenType.Closed)
{
return;
}
if (ZipOpen == ZipOpenType.OpenRead)
{
if (_zipFs != null)
{
_zipFs.Close();
_zipFs.Dispose();
}
ZipOpen = ZipOpenType.Closed;
return;
}
_zip64 = false;
bool lTrrntzip = true;
_centerDirStart = (ulong)_zipFs.Position;
if (_centerDirStart >= 0xffffffff)
_zip64 = true;
CrcCalculatorStream crcCs = new CrcCalculatorStream(_zipFs, true);
foreach (LocalFile t in _localFiles)
{
t.CenteralDirectoryWrite(crcCs);
_zip64 |= t.Zip64;
lTrrntzip &= t.TrrntZip;
}
crcCs.Flush();
crcCs.Close();
_centerDirSize = (ulong)_zipFs.Position - _centerDirStart;
_fileComment = lTrrntzip ? GetBytes("TORRENTZIPPED-" + crcCs.Crc.ToString("X8")) : new byte[0];
_pZipStatus = lTrrntzip ? ZipStatus.TrrntZip : ZipStatus.None;
crcCs.Dispose();
if (_zip64)
{
_endOfCenterDir64 = (ulong)_zipFs.Position;
Zip64EndOfCentralDirWrite();
Zip64EndOfCentralDirectoryLocatorWrite();
}
EndOfCentralDirWrite();
_zipFs.SetLength(_zipFs.Position);
_zipFs.Flush();
_zipFs.Close();
_zipFs.Dispose();
_zipFileInfo = new IO.FileInfo(_zipFileInfo.FullName);
ZipOpen = ZipOpenType.Closed;
}