/// <summary>
/// Attempts to recover a LiteDB database with one or more broken collections.
/// </summary>
/// <returns>A list of names of unrecoverable collection.</returns>
/// <exception cref="ArgumentNullException">Gets thrown when the filename/path is null, empty or whitespace</exception>
/// <exception cref="FileNotFoundException">Gets thrown when the file specified by the filename/path could not be found</exception>
/// <exception cref="LiteException">Gets thrown when another LiteDB specific error occurs</exception>
public static IList <string> RecoveryV2(string filename, string password = null)
{
if (filename.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(filename));
}
if (!File.Exists(filename))
{
throw new FileNotFoundException();
}
IList <string> unrecoverableCollections = new List <string>();
var tempFilename = FileHelper.GetTempFile(filename, "-temp", true);
using (var oldDbStream = new FileStream(filename, System.IO.FileMode.Open, FileAccess.Read))
{
var buffer = new byte[BasePage.PAGE_SIZE];
// read headerPage
oldDbStream.Read(buffer, 0, buffer.Length);
// checks if plain or encrypted
IFileReader reader;
if (Encoding.UTF8.GetString(buffer, 25, HeaderPage.HEADER_INFO.Length) == HeaderPage.HEADER_INFO && buffer[52] == 7)
{
reader = new FileReaderV7(oldDbStream, password);
}
else
{
throw new LiteException(0, "Invalid data file format to upgrade");
}
try
{
using (var engine = new LiteEngine(tempFilename, password))
{
unrecoverableCollections = engine.Rebuild(reader);
}
}
finally
{
reader.Dispose();
}
}
// delete source file so the fixed file can take its place
File.Delete(filename);
// rename temp file into filename
File.Move(tempFilename, filename);
return(unrecoverableCollections);
}
public long Rebuild(RebuildOptions options)
{
this.OpenDatabase();
try
{
return(_engine.Rebuild(options));
}
finally
{
this.CloseDatabase();
}
}
