readInto method
Implementation
@override
Future<ReadResult> readInto(ReadBuf dst) async {
if (dst.remaining == 0) return const ReadResult(0);
if (_start == _end) {
if (dst.remaining >= _buffer.length) {
return inner.readInto(dst);
}
final ok = await fillBuf();
if (!ok && _end == 0) return const ReadResult(0, eof: true);
}
final n = buffered.clamp(0, dst.remaining);
dst.unfilled.setRange(0, n, _buffer, _start);
dst.advance(n);
_start += n;
return ReadResult(n);
}