private async Task BuildFileAsync(string hashDir, HashAlgorithm crypto, IFileInfo file)
{
Stream fileStream = file.Open(FileMode.Open, FileAccess.Read);
Stream hashStream = null;
byte[] hash;
try
{
string fileName = file.GetRelativeName(_filePath, _fileType.DirectorySearchOption);
if (_hashFileMap.TryGetValue(fileName, out IFileInfo hashFile))
{
hashStream = hashFile.Open(FileMode.OpenOrCreate);
hash = await _changeDetector.DetectAsync(fileStream, hashStream).ConfigureAwait(false);
_hashFileMap.TryRemove(fileName, out _);
}
else
{
//new hash
_fileSystem.Directory.CreateDirectoriesIfNotExist(hashDir, fileName);
hashStream = _fileSystem.File.Create($"{Path.Combine(hashDir, fileName)}.hashfile");
hash = crypto.ComputeHash(fileStream);
}
if (hash != null)
{
await _fileType.SaveAsync(file, fileStream).ConfigureAwait(false);
await _changeDetector.WriteHashAsync(hash, hashStream).ConfigureAwait(false);
}
}
finally
{
fileStream.Close();
hashStream?.Close();
}
}