private void AssertSeek(int offset, int length, int seekOffset, SeekOrigin seekOrigin)
{
var source = new MemoryStream(SourceData);
var streamlet = new Streamlet(source, offset, length);
streamlet.Seek(seekOffset, seekOrigin);
long sourcePosition;
long position;
switch (seekOrigin)
{
case SeekOrigin.Begin:
case SeekOrigin.Current:
sourcePosition = offset + seekOffset;
position = seekOffset;
break;
case SeekOrigin.End:
sourcePosition = offset + length - seekOffset;
position = length - seekOffset;
break;
default:
throw new NotSupportedException();
}
Assert.AreEqual(sourcePosition, source.Position);
Assert.AreEqual(position, streamlet.Position);
}
private void AssertRead(int offset, int length)
{
var source = new MemoryStream(SourceData);
var streamlet = new Streamlet(source, offset, length);
var block = new byte[SourceData.Length];
var read = streamlet.Read(block, 0, block.Length);
var sourceBalance = source.Length - offset;
var expectedRead = Math.Min(sourceBalance, length);
Assert.AreEqual(expectedRead, read);
var expectedSequence = SourceData.Skip(offset).Take(read);
var sequence = block.Take(read);
Assert.IsTrue(expectedSequence.SequenceEqual(sequence));
Assert.AreEqual(offset + read, source.Position);
}