public static Symbol Guid(Action <Guid> match)
{
return(new Symbol((reader) =>
{
// Guid must be read in big endian according to RFC 4122...
var bigEndianReader = new CustomEndianBinaryReader(Endian.Big, reader.BaseStream);
Guid g = new Guid(bigEndianReader.ReadInt32(),
bigEndianReader.ReadInt16(),
bigEndianReader.ReadInt16(),
bigEndianReader.ReadByte(), bigEndianReader.ReadByte(), bigEndianReader.ReadByte(), bigEndianReader.ReadByte(),
bigEndianReader.ReadByte(), bigEndianReader.ReadByte(), bigEndianReader.ReadByte(), bigEndianReader.ReadByte());
match(g);
return true;
}));
}
public static Match Parse(this byte[] sequence, Endian endian, params Symbol[] symbols)
{
Match match = new Match();
int patternPosition = 0;
MemoryStream stream = new MemoryStream(sequence);
BinaryReader br = new CustomEndianBinaryReader(endian, stream);
while (br.BaseStream.CanRead && patternPosition < symbols.Length)
{
long pos = stream.Position;
if (symbols[patternPosition].Parse(br))
{
patternPosition++;
if (match.Start == 0)
{
match.Start = (int)pos;
}
}
else
{
stream.Position = pos + 1; // failed to match, advance position only 1 byte
match.Start = 0;
patternPosition = 0;
}
}
if (patternPosition == symbols.Length)
{
match.End = (int)stream.Position;
match.MatchedBytes = sequence.Skip(match.Start).Take(match.End - match.Start).ToArray();
match.UnmatchedBytes = sequence.Take(match.Start).Concat(sequence.Skip(match.End).Take(sequence.Length - match.End)).ToArray();
}
else
{
match.End = 0;
match.MatchedBytes = null;
match.UnmatchedBytes = sequence.ToArray();
}
return(match);
}
