public void ChunkHashesMatchAndRollupToIdentifier()
{
var random = new Random();
TryWithDifferentSizes(testSize =>
{
var bytes = new byte[testSize];
random.NextBytes(bytes);
var blocks = new List <BlobBlockHash>();
var rollingId = new VsoHash.RollingBlobIdentifierWithBlocks();
BlobIdentifierWithBlocks blobIdentifierWithBlocks = null;
for (int i = 0; i < testSize;)
{
int blockSize = Math.Min(testSize - i, VsoHash.BlockSize);
var block = new byte[blockSize];
Array.Copy(bytes, i, block, 0, blockSize);
BlobBlockHash blockHash = VsoHash.HashBlock(block, blockSize);
blocks.Add(blockHash);
i += blockSize;
if (i < testSize)
{
rollingId.Update(blockHash);
}
else
{
blobIdentifierWithBlocks = rollingId.Finalize(blockHash);
}
}
if (testSize == 0)
{
BlobBlockHash blockHash = VsoHash.HashBlock(new byte[] { }, 0);
blocks.Add(blockHash);
blobIdentifierWithBlocks = rollingId.Finalize(blockHash);
}
using (var byteStream = new MemoryStream(bytes))
{
BlobIdentifierWithBlocks identifierWithBlocks = VsoHash.CalculateBlobIdentifierWithBlocks(byteStream);
Assert.True(identifierWithBlocks.BlockHashes.SequenceEqual(blocks));
Assert.Equal(identifierWithBlocks, blobIdentifierWithBlocks);
}
});
}
public void BlockHashesDoNotChange()
{
var knownValues = new Dictionary <IEnumerable <int>, string>()
{
{ Enumerable.Empty <int>(), "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855" },
{ Enumerable.Range(0, 1), "1406E05881E299367766D313E26C05564EC91BF721D31726BD6E46E60689539A" },
{ Enumerable.Range(0, VsoHash.PageSize - 1), "12078762B8EDA8A5499C46E9B5C7F8D37BAB3A684571AEFC2A7D3ABCD56C093E" },
{ Enumerable.Range(0, VsoHash.PageSize), "B00BE365B41949CF3571F69F8F5AD95514F6AFDFE094ABA614ECD34BD828272B" },
{ Enumerable.Range(0, VsoHash.PageSize + 1), "4A3E85BABDD4243495A3617E9316BDF9CDC4526F97AA0E435A47226876C3D167" },
{ Enumerable.Range(0, VsoHash.BlockSize - 1), "3492B19DDCD76EA1ED5C07090A021705ADC7E7D5C5AAD4FF619FD12FAECEB197" },
{ Enumerable.Range(0, VsoHash.BlockSize), "E8DEEF25ED53357D2A738D7156067E69892A7BDC190818CD2AD698A3A1F95E03" },
};
foreach (var knownValue in knownValues)
{
byte[] bytes = knownValue.Key.Select(i => (byte)(i & 0xFF)).ToArray();
Assert.Equal(
knownValue.Value,
VsoHash.HashBlock(bytes, bytes.Length).HashString);
}
}
/// <summary>
/// Gets a single hash representing the ContentHashList
/// </summary>
public static byte[] GetHashOfHashes(this ContentHashList contentHashList)
{
var rollingBlobIdentifier = new VsoHash.RollingBlobIdentifier();
BlobIdentifier blobIdOfContentHashes = VsoHash.OfNothing.BlobId;
for (int i = 0; i < contentHashList.Hashes.Count; i++)
{
BlobIdentifier blobId = BlobIdentifier.Deserialize(contentHashList.Hashes[i].ToHex());
if (i != contentHashList.Hashes.Count - 1)
{
rollingBlobIdentifier.Update(VsoHash.HashBlock(blobId.Bytes, blobId.Bytes.Length));
}
else
{
blobIdOfContentHashes = rollingBlobIdentifier.Finalize(VsoHash.HashBlock(blobId.Bytes, blobId.Bytes.Length));
}
}
return(blobIdOfContentHashes.Bytes);
}