private static void GenerateAndSendHashes(Stream stream, C3C4TaylorsRollingChecksum rollingChecksum, Stream fileStream, int fileSize, byte[] buffer)
{
int fileSize2 = fileSize;
int weakHash = 0;
while (fileSize2 > 0)
{
int toSend = fileSize2 < BlockSize ? fileSize2 : BlockSize;
for (int i = 0; i < toSend; ++i)
weakHash = rollingChecksum.Slide();
weakHash.WriteTo(stream);
fileStream.Seek(fileSize - fileSize2, 0);
fileStream.ForceRead(buffer, 0, toSend);
byte[] strongHash = Md5.ComputeHash(buffer, 0, toSend);
stream.Write(strongHash, 0, strongHash.Length);
toSend.WriteTo(stream);
fileSize2 -= toSend;
}
}
private static List<Chunk> DiscoverChunksInLocalFile(Dictionary<int, List<Chunk>> remoteChunks, C3C4TaylorsRollingChecksum weakHashFunction, Stream fileStreamOld, int fileSizeOld, byte[] buffer)
{
var chunks = new List<Chunk>();
int i = 0;
while (i++ < fileSizeOld)
{
int weakHash = weakHashFunction.Slide();
List<Chunk> sameWeakHashChunks;
if (remoteChunks.TryGetValue(weakHash, out sameWeakHashChunks))
{
byte[] strongHash = null;
foreach (var chunk in sameWeakHashChunks)
{
if (chunk.Found || i < chunk.Length)
continue;
if (strongHash == null)
{
fileStreamOld.Seek(i - chunk.Length, 0);
fileStreamOld.ForceRead(buffer, 0, chunk.Length);
strongHash = Md5.ComputeHash(buffer, 0, chunk.Length);
fileStreamOld.Seek(i, 0);
}
if (strongHash.AreEqual(chunk.StrongHash))
{
chunk.Found = true;
chunk.OldStart = i - chunk.Length;
chunks.Add(chunk);
}
}
}
}
chunks.Sort((i1, i2) => i1.NewStart.CompareTo(i2.NewStart));
return chunks;
}