private void WriteEndContainer(BionMarker container)
{
Write(container);
// End Index is bytes written *after* end marker, so seek will find the next thing
_containerIndex?.End(_writer.BytesWritten);
}
private void WriteStartContainer(BionMarker container)
{
// Start Index is bytes written *before* start marker, so seek will find the start marker
_containerIndex?.Start(_writer.BytesWritten);
Write(container);
}
private void WriteFixedInteger(BionMarker marker, ulong value, byte length)
{
_writer.EnsureSpace(length + 1);
int index = _writer.Index++;
NumberConverter.WriteSevenBitFixed(_writer, value, length);
_writer.Buffer[index] = (byte)(marker + length);
}
private void WriteVariableInteger(BionMarker marker, ulong value)
{
_writer.EnsureSpace(11);
int index = _writer.Index++;
byte length = NumberConverter.WriteSevenBitExplicit(_writer, value);
_writer.Buffer[index] = (byte)(marker + length);
}
public bool Read()
{
_reader.EnsureSpace(20);
// Check for end (after reading one thing at the root depth)
if (_reader.EndOfStream)
{
TokenType = BionToken.None;
return(false);
}
// Read the marker
byte marker = _reader.Buffer[_reader.Index++];
// Identify the token type and length
_currentMarker = (BionMarker)marker;
_currentLength = LengthLookup[marker];
TokenType = TokenLookup[marker];
if (_currentLength < 0)
{
_currentLength = LengthIncludingTerminator();
_currentDecodedString = null;
_currentCompressedStringStart = _reader.Index;
_reader.Index += _currentLength;
}
else if (_currentLength > 0)
{
// Read value (non-string) or length (string)
_currentDecodedNumber = NumberConverter.ReadSevenBitExplicit(_reader, _currentLength);
// Read value (string)
if (marker >= 0xF0)
{
_currentCompressedStringStart = -1;
_currentDecodedString = null;
_currentLength = (int)_currentDecodedNumber;
_reader.EnsureSpace(_currentLength);
_currentString = String8.Reference(_reader.Buffer, _reader.Index, _currentLength);
_reader.Index += _currentLength;
}
}
else
{
// Adjust depth (length 0 tokens only)
_currentDepth += DepthLookup[marker];
}
if (TokenType == BionToken.None)
{
throw new BionSyntaxException($"Invalid Bion Token 0x{_currentMarker:X2} @{BytesRead:n0}.");
}
return(true);
}
private void Write(BionMarker marker, byte lengthOrValue)
{
Write((byte)((byte)marker | lengthOrValue));
}
private void Write(BionMarker marker)
{
Write((byte)marker);
}