Raven.ManagedStorage.Degenerate.PersistentDictionary.ReadDataNoCaching C# (CSharp) Méthode

        private byte[] ReadDataNoCaching(long pos, int size)
        {
            persistentSource.Data.Position = pos;

            var read = 0;
            var buf = new byte[size];
            do
            {
                int dataRead = persistentSource.Data.Read(buf, read, buf.Length - read);
                if (dataRead == 0) // nothing read, EOF, probably truncated write, 
                {
                    throw new InvalidDataException("Could not read complete data, the data file is corrupt");
                }
                read += dataRead;
            } while (read < buf.Length);
            return buf;
        }