簡易硬體解壓縮

Microsoft::WRL::ComPtr<IDStorageFactoryX> inflateDropInFactory;
Microsoft::WRL::ComPtr<IDStorageQueueX> inflateDropInQueue;
Microsoft::WRL::ComPtr<IDStorageStatusArrayX> inflateDropInStatus;

void CreateDSObjects()
{
    DX::ThrowIfFailed(DStorageGetFactory(__uuidof(IDStorageFactoryX), (void**)(inflateDropInFactory.ReleaseAndGetAddressOf())));
    DSTORAGE_QUEUE_DESC queueDesc = {};
    queueDesc.SourceType = DSTORAGE_REQUEST_SOURCE_MEMORY;
    queueDesc.Priority = DSTORAGE_PRIORITY_REALTIME;
    queueDesc.Capacity = DSTORAGE_MIN_QUEUE_CAPACITY;
    inflateDropInFactory->CreateQueue(&queueDesc, __uuidof(IDStorageQueueX), (void**)(inflateDropInQueue.ReleaseAndGetAddressOf()));
    inflateDropInFactory->CreateStatusArray(1, nullptr, __uuidof(IDStorageStatusArrayX), (void**)(inflateDropInStatus.ReleaseAndGetAddressOf()));
}

int inflateDropIn(z_streamp strm, int flush)
{
    bool fallback(false);
    if (strm->avail_out <= strm->total_in)
        fallback = true;
    if (flush != Z_FINISH)
        fallback = true;
    if (strm->avail_out < c_hardwareSizeCrossOverSize)
        fallback = true;
    if (fallback)
        return inflate(strm, flush);

    DSTORAGE_REQUEST request = {};
    request.Options.ZlibDecompress = true;
    request.Options.SourceType = DSTORAGE_REQUEST_SOURCE_MEMORY;
    request.Source = strm->next_in;
    request.SourceSize = strm->total_in;
    request.Destination = strm->next_out;
    request.DestinationSize = strm->avail_out;
    inflateDropInQueue->EnqueueRequest(&request);
    inflateDropInQueue->EnqueueStatus(inflateDropInStatus.Get(), 0);
    inflateDropInQueue->Submit();
    while (!inflateDropInStatus->IsComplete(0))
    {
        _mm_pause();
    }
    return Z_STREAM_END;
}