internal LiteFileStream(LiteEngine engine, LiteFileInfo file, FileAccess mode)
{
_engine = engine;
_file = file;
_mode = mode;
if (mode == FileAccess.Read)
{
// initialize first data block
_currentChunkData = this.GetChunkData(_currentChunkIndex);
}
else if (mode == FileAccess.Write)
{
_buffer = new MemoryStream(MAX_CHUNK_SIZE);
// delete chunks content if needed
if (file.Length > 0)
{
var index = 0;
var deleted = true;
// delete one-by-one to avoid all pages files dirty in memory
while (deleted)
{
deleted = _engine.Delete(LiteStorage.CHUNKS, LiteFileStream.GetChunckId(_file.Id, index++)); // index zero based
}
}
// clear size counters
file.Length = 0;
file.Chunks = 0;
}
}
/// <summary>
/// Delete a file inside datafile and all metadata related
/// </summary>
public bool Delete(string id)
{
if (id.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(id));
}
// remove file reference in _files
var deleted = _engine.Delete(FILES, id);
// if not found, just return false
if (!deleted)
{
return(false);
}
// delete all files chunks based on _id string
var index = 0;
// delete one-by-one to avoid all pages files dirty in memory
while (deleted)
{
deleted = _engine.Delete(CHUNKS, LiteFileStream.GetChunckId(id, index++)); // index zero based
}
return(true);
}