private void CalculateBlocks(Queue<Block> blocksToUpload, int blobLength, ICollection<string> order)
{
var offset = 0;
while (blobLength > 0)
{
var blockLength = Math.Min(BlockSize, blobLength);
var block = new Block { Offset = offset, Length = blockLength };
blocksToUpload.Enqueue(block);
order.Add(block.Name);
offset += blockLength;
blobLength -= blockLength;
}
}
private Stream DownloadBlockFromBlob(CloudBlob blob, Block block, Queue<Block> blocksToDownload)
{
try
{
var blobGetRequest = BlobRequest.Get(blob.Uri, 60, null, null);
blobGetRequest.Headers.Add("x-ms-range", string.Format(CultureInfo.InvariantCulture, "bytes={0}-{1}", block.Offset, block.Offset + block.Length - 1));
var credentials = blob.ServiceClient.Credentials;
credentials.SignRequest(blobGetRequest);
var response = blobGetRequest.GetResponse() as HttpWebResponse;
return response != null ? response.GetResponseStream() : null;
}
catch
{
if (++block.Attempt > MaxRetries) throw;
lock (blocksToDownload) blocksToDownload.Enqueue(block);
}
return null;
}
private static void ExtractBytesFromBlockIntoBuffer(byte[] buffer, Stream s, Block block)
{
var offsetInBlock = 0;
var remaining = block.Length;
while (remaining > 0)
{
var read = s.Read(buffer, offsetInBlock, remaining);
offsetInBlock += read;
remaining -= read;
}
}
