public TorrentFileSystem(int numHashes, TorrentFileSystemMemento torrentFileSystemMemento) {
this._name = torrentFileSystemMemento.getName();
this._totalSize = torrentFileSystemMemento.getTotalSize();
this._files = torrentFileSystemMemento.getFiles();
// BEGIN TODO remove this code after releasing a few versions Sept 2nd 2008.
// There was a bug, where the file end piece would be set to numhashes instead of numhashes-1
// the piece index is zero based. old code used to ignore these propblems, some of the newer
// code throws an illegal argument exception.
for (TorrentFile file : _files) {
if (file.getEndPiece() == numHashes) {
file.setEndPiece(numHashes - 1);
}
}
// END TODO
this._unmodFiles = Collections.unmodifiableList(_files);
_folders.addAll(torrentFileSystemMemento.getFolders());
this._incompleteFile = torrentFileSystemMemento.getIncompleteFile();
this._completeFile = torrentFileSystemMemento.getCompleteFile();
}
/**
* Constructs the file system using the given BTData & hash information. If any of the information
* is malformed, throws a ValueException.
*
* @param data contains all the data about a .torrent file
* @param numHashes number of pieces the torrent was divided into
* @param pieceLength size of divided up torrent file
* @param infoHash a string of alphanumeric characters in the .torrent file that the client uses
* to verify the data that is being transferred
* @throws ValueException
*/
TorrentFileSystem(BTData data, int numHashes, long pieceLength, byte[] infoHash)
throws IOException {
// name of the torrent, also specifying the directory under which to save the torrents.
_name = CommonUtils.convertFileName(data.getName());
// we need to check the name of the torrent, security risk!
if (_name.length() == 0) throw new ValueException("bad torrent name");
_incompleteFile =
new File(
SharingSettings.INCOMPLETE_DIRECTORY.get(),
Base32.encode(infoHash) + File.separator + _name);
_completeFile = new File(SharingSettings.getSaveDirectory(_name), _name);
if (!FileUtils.isReallyParent(SharingSettings.getSaveDirectory(_name), _completeFile)) {
throw new SaveLocationException(LocationCode.SECURITY_VIOLATION, _completeFile);
}
if (data.getFiles() != null) {
List<BTData.BTFileData> files = data.getFiles();
List<TorrentFile> torrents = new ArrayList<TorrentFile>(files.size());
long position = 0;
for (BTData.BTFileData file : files) {
String torrentPath = _name + file.getPath();
TorrentFile f =
new TorrentFile(
file.getLength(),
new File(_completeFile, file.getPath()).getAbsolutePath(),
torrentPath);
f.setBeginPiece((int) (position / pieceLength));
f.setStartByte(position);
position += f.length();
f.setEndPiece((int) (position / pieceLength));
f.setEndByte(position - 1);
if (!FileUtils.isReallyInParentPath(_completeFile, f))
throw new SaveLocationException(LocationCode.SECURITY_VIOLATION, f);
torrents.add(f);
}
if (files.size() == 0) throw new ValueException("bad metainfo, no files!");
_files = torrents;
// add folders, for easier conflict checking later on
for (String folderPath : data.getFolders()) _folders.add(new File(_completeFile, folderPath));
_folders.add(_completeFile);
} else {
String torrentPath = data.getName();
TorrentFile f =
new TorrentFile(data.getLength(), _completeFile.getAbsolutePath(), torrentPath);
f.setBeginPiece(0);
f.setStartByte(0);
f.setEndPiece(numHashes - 1);
f.setEndByte(f.length());
_files = new ArrayList<TorrentFile>(1);
_files.add(f);
}
_unmodFiles = Collections.unmodifiableList(_files);
_totalSize = calculateTotalSize(_files);
if (_totalSize <= 0) throw new ValueException("invalid size " + _totalSize);
}
/**
* Updates the files in the specified collection to start at the new base path. The files must
* already be absolute and be children of _completeFile.
*
* @param completeBase the new base path
*/
private void updateReferences(File completeBase, List<TorrentFile> l) {
int offset = _completeFile.getAbsolutePath().length();
String newPath = completeBase.getAbsolutePath();
for (int i = 0; i < l.size(); i++) {
TorrentFile current = l.get(i);
TorrentFile updated =
new TorrentFile(
current.length(),
newPath + current.getPath().substring(offset),
current.getTorrentPath());
updated.setBeginPiece(current.getBeginPiece());
updated.setEndPiece(current.getEndPiece());
updated.setStartByte(current.getStartByte());
updated.setEndByte(current.getEndByte());
l.set(i, updated);
}
}