public async Task ParseAsync(CancellationToken cancellation)
{
_disposed = true;
using (var sr = new StreamReader(_config, Encoding.UTF8))
using (var md5 = MD5.Create())
{
md5.TransformBlock(ByteOrderMark, 0, ByteOrderMark.Length, null, 0);
string previous = null;
OmmConfHeader header = null;
while (!sr.EndOfStream)
{
var current = await sr.ReadLineAsync().ConfigureAwait(false);
if (current.Length == 0)
{
//new section
header = null;
}
else if (current.AsSpan().TrimStart('-').IsEmpty)
{
if (previous is null)
{
throw new InvalidDataException("omm_conf cannot start with separator line ---");
}
header = new OmmConfHeader(previous.Split('|'));
}
else if (!(header is null))
{
var values = current.Split('|');
var data = new OmmConfEntry(header, values);
var section = AddSection(data.Type);
section.Add(data);
}
if (previous != null)
{
var bytes = Encoding.UTF8.GetBytes(previous);
md5.TransformBlock(bytes, 0, bytes.Length, null, 0);
md5.TransformBlock(LineBreak, 0, LineBreak.Length, null, 0);
}
previous = current;
}
md5.TransformFinalBlock(HiddenMd5Data, 0, HiddenMd5Data.Length);
var checksum = HexEncoding.ByteToHex(md5.Hash);
if (previous != checksum)
{
throw new InvalidDataException("invalid checksum");
}
}
}
public OmmConfEntry(OmmConfHeader header, string[] values)
{
_header = header;
_values = values;
}