public ZipReturn ZipFileOpenReadStreamQuick(ulong pos, bool raw, out Stream stream, out ulong streamSize, out ushort compressionMethod)
{
ZipFileCloseReadStream();
ZipLocalFile tmpFile = new ZipLocalFile {
RelativeOffsetOfLocalHeader = pos
};
_localFiles.Clear();
_localFiles.Add(tmpFile);
ZipReturn zRet = tmpFile.LocalFileHeaderReadQuick(_zipFs);
if (zRet != ZipReturn.ZipGood)
{
stream = null;
streamSize = 0;
compressionMethod = 0;
return(zRet);
}
zRet = tmpFile.LocalFileOpenReadStream(_zipFs, raw, out stream, out streamSize, out compressionMethod);
_compressionStream = stream;
return(zRet);
}
public void ZipFileAddZeroLengthFile()
{
ZipLocalFile.LocalFileAddZeroLengthFile(_zipFs);
}
/*
* raw is true if we are just going to copy the raw data stream from the source to the destination zip file
* trrntzip is thue if the source zip is a valid trrntzip file
* compressionMethod must be set to 8 to make a valid trrntzip file.
*
* if raw is false then compressionMthod must be 0,8 or 93 (zstd)
*/
public ZipReturn ZipFileOpenWriteStream(bool raw, bool trrntzip, string filename, ulong uncompressedSize, ushort compressionMethod, out Stream stream, TimeStamps timeStamp = null)
{
stream = null;
if (ZipOpen != ZipOpenType.OpenWrite)
{
return(ZipReturn.ZipWritingToInputFile);
}
ZipReturn validTrrntzip = ZipReturn.ZipGood;
//invalid torrentZip Input If:
if (compressionMethod != 8)
{
validTrrntzip = ZipReturn.ZipTrrntzipIncorrectCompressionUsed;
}
if (raw && !trrntzip)
{
validTrrntzip = ZipReturn.ZipTrrntZipIncorrectDataStream;
}
int localFilesCount = _localFiles.Count;
if (localFilesCount > 0)
{
// check that filenames are in trrntzip order
string lastFilename = _localFiles[localFilesCount - 1].Filename;
if (CompressUtils.TrrntZipStringCompare(lastFilename, filename) > 0)
{
validTrrntzip = ZipReturn.ZipTrrntzipIncorrectFileOrder;
}
// check that no un-needed directory entries are added
if (_localFiles[localFilesCount - 1].IsDirectory && filename.Length > lastFilename.Length)
{
if (CompressUtils.TrrntZipStringCompare(lastFilename, filename.Substring(0, lastFilename.Length)) == 0)
{
validTrrntzip = ZipReturn.ZipTrrntzipIncorrectDirectoryAddedToZip;
}
}
}
// if we are requirering a trrrntzp file and it is not a trrntzip formated supplied stream then error out
if (writeZipType == OutputZipType.TrrntZip)
{
if (validTrrntzip != ZipReturn.ZipGood)
{
return(validTrrntzip);
}
}
ZipLocalFile lf = new ZipLocalFile(filename, timeStamp);
lf.SetStatus(LocalFileStatus.TrrntZip, validTrrntzip == ZipReturn.ZipGood);
ZipReturn retVal = lf.LocalFileOpenWriteStream(_zipFs, raw, uncompressedSize, compressionMethod, out stream);
if (retVal != ZipReturn.ZipGood)
{
return(retVal);
}
if (filename.Length > 0)
{
lf.IsDirectory = (filename.Substring(filename.Length - 1, 1) == "/");
}
_compressionStream = stream;
_localFiles.Add(lf);
return(ZipReturn.ZipGood);
}