private static BlobIdentifier ComputeIdentifierBasedOnBlocks(IEnumerable <BlobBlockHash> blocks)
{
var rollingId = new VsoHash.RollingBlobIdentifier();
// ReSharper disable once GenericEnumeratorNotDisposed
IEnumerator <BlobBlockHash> enumerator = blocks.GetEnumerator();
bool isLast = !enumerator.MoveNext();
if (isLast)
{
throw new InvalidDataException("Blob must have at least one block.");
}
BlobBlockHash current = enumerator.Current;
isLast = !enumerator.MoveNext();
while (!isLast)
{
rollingId.Update(current);
current = enumerator.Current;
isLast = !enumerator.MoveNext();
}
return(rollingId.Finalize(current));
}
/// <inheritdoc />
public override void Initialize()
{
_currentOffset = 0;
_rollingId = new VsoHash.RollingBlobIdentifier();
_blockHashes.Clear();
_finalized = null;
}
/// <inheritdoc />
public override void Initialize()
{
_currentOffset = 0;
_rollingId = new VsoHash.RollingBlobIdentifier();
_blockHashes.Clear();
if (_buffer == null)
{
// Initialize can be called more than once per instance, once during construction, and another time by HasherToken.
// This is not happening concurrently, so no need for any synchronization.
_bufferHandle = GlobalObjectPools.TwoMbByteArrayPool.Get();
_buffer = _bufferHandle.Value;
}
}
/// <inheritdoc />
protected override byte[] HashFinal()
{
var rollingId = new VsoHash.RollingBlobIdentifier();
// Flush out buffer
if (_currentOffset != 0)
{
_blockHashes.Add(VsoHash.HashBlock(_buffer, _currentOffset));
}
// if there are no blocks add an empty block
if (_blockHashes.Count == 0)
{
_blockHashes.Add(VsoHash.HashBlock(new byte[] { }, 0));
}
for (int i = 0; i < _blockHashes.Count - 1; i++)
{
rollingId.Update(_blockHashes[i]);
}
return(rollingId.Finalize(_blockHashes[_blockHashes.Count - 1]).Bytes);
}
