private async Task <byte[]> LoadDataAsync(int blockIndex)
{
ThrowIfDisposed();
if (m_blocks !.Count <= blockIndex)
{
m_blocks.AddRange(new byte[blockIndex - m_blocks.Count + 1][]);
}
var blockData = m_blocks[blockIndex];
if (blockData is null)
{
WrappedStream.Position = blockIndex * c_blockSize;
blockData = new byte[c_blockSize];
var bytesRead = await WrappedStream.ReadBlockAsync(blockData, 0, blockData.Length).ConfigureAwait(false);
if (bytesRead != c_blockSize)
{
Array.Resize(ref blockData, bytesRead);
}
m_blocks[blockIndex] = blockData;
}
return(blockData);
}