private static void WalkBlocks(
Stream stream,
SemaphoreSlim?blockActionSemaphore,
bool multipleBlocksInParallel,
SingleBlockBlobCallback singleBlockCallback,
MultipleBlockBlobCallback multipleBlockCallback,
MultipleBlockBlobSealCallback multipleBlockSealCallback,
long bytesToReadFromStream = -1)
{
bytesToReadFromStream = (bytesToReadFromStream >= 0) ? bytesToReadFromStream : (stream.Length - stream.Position);
bool isSingleBlockBlob = bytesToReadFromStream <= BlockSize;
if (isSingleBlockBlob)
{
WalkSingleBlockBlob(stream, blockActionSemaphore, singleBlockCallback, bytesToReadFromStream);
}
else
{
WalkMultiBlockBlob(stream, blockActionSemaphore, multipleBlocksInParallel, multipleBlockCallback, multipleBlockSealCallback, bytesToReadFromStream);
}
}
private static void WalkMultiBlockBlob(
Stream stream,
SemaphoreSlim?blockActionSemaphore,
bool multiBlocksInParallel,
MultipleBlockBlobCallback multipleBlockCallback,
MultipleBlockBlobSealCallback multipleBlockSealCallback,
long bytesLeftInBlob)
{
var rollingId = new RollingBlobIdentifierWithBlocks();
BlobIdentifierWithBlocks?blobIdentifierWithBlocks = null;
Lazy <List <Task> > tasks = new Lazy <List <Task> >(() => new List <Task>());
do
{
ReadBlock(
stream,
blockActionSemaphore,
bytesLeftInBlob,
(blockBufferHandle, blockLength, blockHash) =>
{
bytesLeftInBlob -= blockLength;
bool isFinalBlock = bytesLeftInBlob == 0;
try
{
if (isFinalBlock)
{
blobIdentifierWithBlocks = rollingId.Finalize(blockHash);
}
else
{
rollingId.Update(blockHash);
}
}
catch
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
throw;
}
if (multiBlocksInParallel)
{
tasks.Value.Add(Task.Run(() =>
{
try
{
multipleBlockCallback(blockBufferHandle.Value, blockLength, blockHash, isFinalBlock);
}
finally
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
}
}));
}
else
{
try
{
multipleBlockCallback(blockBufferHandle.Value, blockLength, blockHash, isFinalBlock);
}
finally
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
}
}
});
}while (bytesLeftInBlob > 0);
if (tasks.IsValueCreated)
{
Task.WaitAll(tasks.Value.ToArray());
}
multipleBlockSealCallback(blobIdentifierWithBlocks);
}
