public bool Remove(ReadOnlySpan <byte> key)
{
var len = 1 + sizeof(int) + key.Length;
var buffer = ArrayPool <byte> .Shared.Rent(len);
try {
var span = buffer.AsSpan(0, len);
span[0] = (byte)RecordType.Remove;
BinaryPrimitives.WriteInt32LittleEndian(span.Slice(1), key.Length);
key.CopyTo(span.Slice(1 + sizeof(int)));
var transformed = transformer.TransformBlock(span);
stream.WriteInt32((int)(Math.Ceiling(span.Length / 1024.0) * 1024.0));
stream.WriteInt32(transformed.Length);
stream.Write(transformed);
MaybeFlush();
}
finally {
ArrayPool <byte> .Shared.Return(buffer);
}
return(true);
}
private void Test(IBlockTransformer transformer)
{
var buffer = Enumerable.Range(0, 128).Select(v => (byte)v).ToArray();
var cmp = Enumerable.Range(0, 128).Select(v => (byte)v).ToArray();
var trans = transformer.TransformBlock(buffer);
if (!transformer.MayChangeSize)
{
Assert.AreEqual(trans.Length, cmp.Length);
}
Assert.IsTrue(buffer.AsSpan().SequenceEqual(cmp));
var back = new byte[buffer.Length * 2];
var backspan = back.AsSpan(0, transformer.UntransformBlock(trans, back));
Assert.IsTrue(backspan.SequenceEqual(cmp));
}