private List <RemainingBytes> GenerateByteRangesOfBlobToDownload(List <BlockSignature> sigsToReuseList, SizeBasedCompleteSignature cloudBlobSig, string containerName, string blobName)
{
var blobSize = AzureHelper.GetBlobSize(containerName, blobName);
var remainingBytesList = new List <RemainingBytes>();
var allBlobSigs = cloudBlobSig.Signatures.Values.SelectMany(x => x.SignatureList).OrderBy(a => a.Offset).ToList();
var sortedSigs = (from sig in sigsToReuseList orderby sig.Offset ascending select sig).ToList();
long startOffsetToCopy = 0;
// loop through all cloudBlobSigs.
// If have a match in sigsToReuse, skip it.
// otherwise, take note of offset and size to download.
foreach (var sig in allBlobSigs)
{
var haveMatchingSig = sigsToReuseList.Any(s => s.MD5Signature.SequenceEqual(sig.MD5Signature));
if (!haveMatchingSig)
{
// if no match then we need to copy everything from startOffsetToCopy to sig.Offset + sig.Size
remainingBytesList.Add(new RemainingBytes()
{
BeginOffset = startOffsetToCopy,
EndOffset = sig.Offset + sig.Size - 1
});
startOffsetToCopy = sig.Offset + sig.Size;
}
else
{
// we have a match therefore dont need to copy the data.
// change startOffsetToCopy to just after current sig.
startOffsetToCopy = sig.Offset + sig.Size;
}
}
return(remainingBytesList);
}
