// Archiwizuje wskazany po ścieżce plik
public void ArchiveFile(string path)
{
if (!IsOpen)
{
throw new Exception("Archiwum nieotwarte");
}
if (!ArchiveKey.IsDerived)
{
throw new Exception("Klucz niewyprowadzony");
}
if (!File.Exists(path))
{
throw new Exception("Plik pod wskazaną lokalizacją nie istnieje");
}
FileData file = FileData.Create(path);
string plaintextName = file.NameStr;
if (!FileNameUnique(plaintextName))
{
throw new FileNamingException(plaintextName);
}
if (IsCompressed)
{
FileCompressor.CompressFile(file);
}
FileEncryptor.EncryptFile(file, ArchiveKey);
SQLiteCommand command = new SQLiteCommand(Connection);
command.CommandText = "INSERT INTO FileData(name_l, name, content_l, content, iv) VALUES" +
"(" +
"'" + Convert.ToString(file.NameLength) + "', " +
"@Name, " +
"'" + Convert.ToString(file.ContentLength) + "', " +
"@Content, " +
"@IV" +
")";
command.Parameters.Add(new SQLiteParameter("Name", file.Name));
command.Parameters.Add(new SQLiteParameter("Content", file.Content));
command.Parameters.Add(new SQLiteParameter("IV", file.IV));
command.ExecuteNonQuery();
command.CommandText = "SELECT last_insert_rowid();";
long lastRowId = (long)command.ExecuteScalar();
int fileId = (int)lastRowId;
// Przechowanie pary id_pliku-nazwa_pliku
IdFileNamePairs.Add(fileId, plaintextName);
}
// Usuwa wszystkie pliki z archiwum
public void DeleteAll()
{
SQLiteCommand command = new SQLiteCommand(Connection);
command.CommandText = "DELETE FROM FileData;";
command.ExecuteNonQuery();
IdFileNamePairs.Clear();
}
/*
* Metody publiczne realizujące operacje na otwartym archiwum
*/
// Zamyka otwarte archiwum
public void Close()
{
if (IsOpen)
{
Connection.Close();
ArchiveKey.Reset();
FilePath = "";
IdFileNamePairs.Clear();
}
}
// Wczytuje z bazy zaszyfrowane nazwy plików (razem z id) i odszyfrowuje je
private void SelectPlaintextFileNames()
{
if (!IsOpen)
{
throw new Exception("Archiwum nieotwarte");
}
if (!ArchiveKey.IsDerived)
{
throw new Exception("Klucz niewyprowadzony");
}
SQLiteCommand command = new SQLiteCommand(Connection);
command.CommandText = "SELECT id, name_l, length(name), name, iv FROM FileData;";
SQLiteDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
IdFileNamePairs.Clear();
}
while (reader.Read())
{
int id = reader.GetInt32(0);
int nameLength = reader.GetInt32(1);
int nameBlobLength = reader.GetInt32(2);
byte[] name_bytes = new byte[nameBlobLength];
reader.GetBytes(3, 0, name_bytes, 0, nameBlobLength);
byte[] iv = new byte[EncryptionKey.BlockLength];
reader.GetBytes(4, 0, iv, 0, EncryptionKey.BlockLength);
name_bytes = Encryptor.DecryptBytes(name_bytes, ArchiveKey.Value, iv);
byte[] n = new byte[nameLength];
for (int i = 0; i < nameLength; i++)
{
n[i] = name_bytes[i];
}
string name = Encoding.ASCII.GetString(n);
IdFileNamePairs.Add(id, name);
}
}
// Usuwa z archiwum wskazany po identyfikatorze plik
public void Delete(int id)
{
if (!IsOpen)
{
throw new Exception("Archiwum nieotwarte");
}
if (!ArchiveKey.IsDerived)
{
throw new Exception("Klucz niewyprowadzony");
}
SQLiteCommand command = new SQLiteCommand(Connection);
command.CommandText = "DELETE FROM FileData WHERE id='" + Convert.ToString(id) + "';";
command.ExecuteNonQuery();
IdFileNamePairs.Remove(id);
}
