public override void Reset()
{
Inner.Reset();
_state = ewah_state.init;
_wpos = 0;
_position = 0;
}
private async ValueTask <bool> RefillAsync(bool allowWait)
{
if (_state <= ewah_state.start && !allowWait && Inner.Peek().IsEmpty)
{
return(false);
}
if (_lengthBits is null)
{
var bb = await Inner.ReadFullAsync(4 + 4).ConfigureAwait(false);
_lengthBits = NetBitConverter.ToUInt32(bb, 0);
_compressedSize = NetBitConverter.ToInt32(bb, 4);
_left = _compressedSize;
_state = ewah_state.start;
}
int peekLength = Inner.Peek().Length / sizeof(ulong);
_wpos = 0;
switch (_state)
{
case ewah_state.start:
ulong curOp = await Inner.ReadNetworkUInt64Async().ConfigureAwait(false);
_repBit = (curOp & 1UL) != 0;
_repCount = (uint)(curOp >> 1);
_rawCount = (int)(curOp >> 33);
_left--;
peekLength--;
_state = ewah_state.same;
goto case ewah_state.same;
case ewah_state.same:
byte val = _repBit ? (byte)0xFF : (byte)0;
while (_repCount > 0 && _wpos + 8 < _buffer.Length)
{
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_repCount--;
}
if (_repCount > 0)
{
_readable = new BucketBytes(_buffer, 0, _wpos);
return(true);
}
_state = ewah_state.raw;
goto case ewah_state.raw;
case ewah_state.raw:
while (_rawCount > 0)
{
if ((_wpos > 8 && peekLength < 8) || (_wpos + 8 >= _buffer.Length))
{
// Avoid new reads if we already have something. Return result
_readable = new BucketBytes(_buffer, 0, _wpos);
return(true);
}
var bb = await Inner.ReadFullAsync(sizeof(ulong)).ConfigureAwait(false);
if (bb.Length != sizeof(ulong))
{
throw new BucketEofException(Inner);
}
peekLength--;
_left--;
_rawCount--;
for (int i = bb.Length - 1; i >= 0; i--)
{
_buffer[_wpos++] = bb[i];
}
}
if (_left == 0)
{
_state = ewah_state.footer;
_readable = new BucketBytes(_buffer, 0, _wpos);
return(true);
}
_state = ewah_state.start;
goto case ewah_state.start;
case ewah_state.footer:
await Inner.ReadNetworkUInt32Async().ConfigureAwait(false);
_state = ewah_state.done;
goto case ewah_state.done;
case ewah_state.done:
default:
return(false);
}
}
public GitEwahBitmapBucket(Bucket inner)
: base(inner)
{
_state = ewah_state.init;
_buffer = new byte[512];
}
