public static RawHash CalculateStream <T>(Stream stream) where T : HashAlgorithm
{
if (stream == null)
{
return(RawHash.Zero());
}
byte[] hash;
using (var hashAlgorithm = GetHashAlgorithm(typeof(T)))
hash = hashAlgorithm.ComputeHash(stream);
return(new RawHash(hash));
}
public static RawHash CalculateStream(Stream stream)
{
if (stream == null)
{
return(RawHash.Zero());
}
byte[] hash;
// There is a bug in spooky hash that prevents some trailing data from being added to the hash. It can also result in reading beyond the speicifed buffer.
// Until this is addressed in the engine, we will revert to using MD5
// There is a Jira ticket to investigate this further: https://jira.unity3d.com/browse/ADDR-1193?jql=text%20~%20%22spooky%22
using (var hashAlgorithm = GetHashAlgorithm(typeof(MD5)))
hash = hashAlgorithm.ComputeHash(stream);
return(new RawHash(hash));
}
/// <summary>
/// Creates the hash for a set of objects.
/// </summary>
/// <typeparam name="T">The hash algorithm type.</typeparam>
/// <param name="objects">The objects.</param>
/// <returns>Returns the hash of the set of objects.</returns>
public static RawHash Calculate <T>(params object[] objects) where T : HashAlgorithm
{
if (objects == null)
{
return(RawHash.Zero());
}
RawHash rawHash;
using (var stream = new HashStream(GetHashAlgorithm(typeof(T))))
{
GetRawBytes(stream, objects);
rawHash = stream.GetHash();
}
return(rawHash);
}
/// <summary>
/// Creates the hash for a stream of data.
/// </summary>
/// <param name="stream">The stream of data.</param>
/// <returns>Returns the hash of the stream.</returns>
public static RawHash CalculateStream(Stream stream)
{
if (stream == null)
{
return(RawHash.Zero());
}
if (stream is HashStream hs)
{
return(hs.GetHash());
}
byte[] hash;
using (var hashAlgorithm = GetHashAlgorithm())
hash = hashAlgorithm.ComputeHash(stream);
return(new RawHash(hash));
}
public static RawHash CalculateStream(Stream stream)
{
if (stream == null)
{
return(RawHash.Zero());
}
byte[] hash;
#if UNITY_2019_3_OR_NEWER
using (var hashAlgorithm = GetHashAlgorithm(typeof(SpookyHash)))
#else
using (var hashAlgorithm = GetHashAlgorithm(typeof(MD5)))
#endif
hash = hashAlgorithm.ComputeHash(stream);
return(new RawHash(hash));
}
public static RawHash Calculate <T>(params object[] objects) where T : HashAlgorithm
{
if (objects == null)
{
return(RawHash.Zero());
}
RawHash rawHash;
using (var stream = new MemoryStream())
{
GetRawBytes(stream, objects);
stream.Position = 0;
rawHash = CalculateStream <T>(stream);
}
return(rawHash);
}
