public HashedStream(Stream stream, ulong readSeed0, ulong readSeed1, ulong writeSeed0, ulong writeSeed1)
{
ExceptionHelper.CheckNotNull(stream);
_backing = stream;
_read = new SpookyHash(readSeed0, readSeed1);
_written = new SpookyHash(writeSeed0, writeSeed1);
}
public unsafe void TestPieces()
{
var bufArr = new byte[BufferSize];
for (int i = 0; i < BufferSize; ++i)
{
bufArr[i] = unchecked((byte)i);
}
for (int i = 0; i < BufferSize; ++i)
{
ulong a, b, c, d, seed1 = 1, seed2 = 2;
var state = new SpookyHash();
// all as one call
a = seed1;
b = seed2;
fixed(byte* buf = bufArr)
SpookyHash.Hash128(buf, i, ref a, ref b);
// all as one piece
c = 0xdeadbeefdeadbeef;
d = 0xbaceba11baceba11;
state.Init(seed1, seed2);
fixed(byte* buf = bufArr)
state.Update(buf, i);
state.Final(out c, out d);
Assert.Equal(a, c);
Assert.Equal(b, d);
for (int j = 0; j < i; ++j)
{
c = seed1;
d = seed2;
state.Init(c, d);
fixed(byte* buf = bufArr)
{
state.Update(buf, j);
state.Update(buf + j, i - j);
}
state.Final(out c, out d);
Assert.Equal(a, c);
Assert.Equal(b, d);
}
}
}
/// <summary>Initialises a new instance of the <see cref="SpookilySharp.HashedStream"/> class with a default
/// seed.</summary>
/// <param name="stream">The stream to read.</param>
public HashedStream(Stream stream)
{
ExceptionHelper.CheckNotNull(stream);
_backing = stream;
_read = new SpookyHash();
_written = new SpookyHash();
}
public async static Task<ulong> SpookyHash64Async(this Stream stream, ulong seed, CancellationToken cancellationToken)
{
ExceptionHelper.CheckNotNull(stream);
cancellationToken.ThrowIfCancellationRequested();
var hash = new SpookyHash(seed, seed);
var buffer = new byte[4096];
for (int len = await stream.ReadAsync(buffer, 0, 4096, cancellationToken); len != 0; len = await stream.ReadAsync(buffer, 0, 4096, cancellationToken))
{
cancellationToken.ThrowIfCancellationRequested();
hash.Update(buffer, 0, len);
}
hash.Final(out seed, out seed);
return seed;
}
public static unsafe ulong SpookyHash64(
#if !NET_20 && !NET_30
this
#endif
Stream stream, ulong seed)
{
ExceptionHelper.CheckNotNull(stream);
var hash = new SpookyHash(seed, seed);
var buffer = new byte[4096];
fixed(void* ptr = buffer)
for(int len = stream.Read(buffer, 0, 4096); len != 0; len = stream.Read(buffer, 0, 4096))
hash.Update(ptr, len);
hash.Final(out seed, out seed);
return seed;
}
public void Serialize()
{
var sh = new SpookyHash();
sh.Update(MediumLengthString);
using(MemoryStream ms = new MemoryStream())
{
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(ms, sh);
ms.Seek(0, SeekOrigin.Begin);
var copy = (SpookyHash)bf.Deserialize(ms);
Assert.Equal(sh.Final(), copy.Final());
}
}
public void SequenceOfStrings()
{
var sh = new SpookyHash();
sh.Update(MediumLengthSequence());
Assert.Equal(SpookyHasher.SpookyHash128(MediumLengthString), sh.Final());
}
public unsafe void FinalsEquivalent()
{
var sh = new SpookyHash();
sh.Update("abcdefg");
var h128 = sh.Final();
ulong u1, u2;
sh.Final(out u1, out u2);
Assert.Equal(h128.UHash1, u1);
Assert.Equal(h128.UHash2, u2);
long l1, l2;
sh.Final(out l1, out l2);
Assert.Equal(h128.Hash1, l1);
Assert.Equal(h128.Hash2, l2);
}
public void ConstructorsEquivalent()
{
ulong ui1 = 0xdeadcafe;
ulong ui2 = 0xbaceba11;
var fromU = new SpookyHash(ui1, ui2);
var fromZU = new SpookyHash();
fromZU.Init(ui1, ui2);
long l1 = unchecked((long)ui1);
long l2 = unchecked((long)ui2);
var fromL = new SpookyHash(l1, l2);
var fromZL = new SpookyHash();
fromZL.Init(l1, l2);
fromU.Update(MediumLengthString);
fromZU.Update(MediumLengthString);
fromL.Update(MediumLengthString);
fromZL.Update(MediumLengthString);
var hash = fromU.Final();
Assert.Equal(hash, fromZU.Final());
Assert.Equal(hash, fromL.Final());
Assert.Equal(hash, fromZL.Final());
Assert.Equal(hash.ToString(), fromZL.Final().ToString());
}
public void StringExtension()
{
string testString;
using(var stm = GetStream())
using(var tr = new StreamReader(stm))
testString = tr.ReadToEnd();
var sh = new SpookyHash();
sh.Update(testString);
var h = sh.Final();
int len = testString.Length;
Assert.Equal(h, SpookyHasher.SpookyHash128(testString));
Assert.Equal(h, SpookyHasher.SpookyHash128(testString, 0, len, 0xDEADBEEFDEADBEEF, 0xDEADBEEFDEADBEEF));
Assert.Equal(
h,
unchecked(SpookyHasher.SpookyHash128(
testString,
0,
len,
(long)0xDEADBEEFDEADBEEF,
(long)0xDEADBEEFDEADBEEF)));
Assert.Equal(h, SpookyHasher.SpookyHash128(testString, 0, len));
var hashSlice = SpookyHasher.SpookyHash128(testString, 50, 100, 0xDEADBEEFDEADBEEF, 0xDEADBEEFDEADBEEF);
Assert.NotEqual(h, hashSlice);
Assert.Equal(
hashSlice,
unchecked(SpookyHasher.SpookyHash128(
testString,
50,
100,
(long)0xDEADBEEFDEADBEEF,
(long)0xDEADBEEFDEADBEEF)));
long longHash = SpookyHasher.SpookyHash64(testString, 0, len, unchecked((long)0xDEADBEEFDEADBEEF));
Assert.Equal(longHash, SpookyHasher.SpookyHash64(testString, unchecked((long)0xDEADBEEFDEADBEEF)));
Assert.Equal(longHash, SpookyHasher.SpookyHash64(testString, 0, len));
Assert.Equal(longHash, SpookyHasher.SpookyHash64(testString));
int hash = SpookyHasher.SpookyHash32(testString, 0, len, unchecked((int)0xDEADBEEF));
Assert.Equal(hash, SpookyHasher.SpookyHash32(testString, unchecked((int)0xDEADBEEF)));
Assert.Equal(hash, SpookyHasher.SpookyHash32(testString, 0, len));
Assert.Equal(hash, SpookyHasher.SpookyHash32(testString));
testString = null;
Assert.Equal(HashCode128.Zero, SpookyHasher.SpookyHash128(testString));
Assert.Equal(
HashCode128.Zero,
SpookyHasher.SpookyHash128(
testString,
0,
200,
0xDEADBEEFDEADBEEF,
0xDEADBEEFDEADBEEF));
Assert.Equal(
HashCode128.Zero,
unchecked(SpookyHasher.SpookyHash128(
testString,
0,
200,
(long)0xDEADBEEFDEADBEEF,
(long)0xDEADBEEFDEADBEEF)));
Assert.Equal(HashCode128.Zero, SpookyHasher.SpookyHash128(testString, 0, 200));
Assert.Equal(
HashCode128.Zero,
SpookyHasher.SpookyHash128(
testString,
50,
100,
0xDEADBEEFDEADBEEF,
0xDEADBEEFDEADBEEF));
Assert.Equal(0, SpookyHasher.SpookyHash64(testString, 0, 200, unchecked((long)0xDEADBEEFDEADBEEF)));
Assert.Equal(0, SpookyHasher.SpookyHash64(testString, unchecked((long)0xDEADBEEFDEADBEEF)));
Assert.Equal(0, SpookyHasher.SpookyHash64(testString, 0, 200));
Assert.Equal(0, SpookyHasher.SpookyHash64(testString));
Assert.Equal(0, SpookyHasher.SpookyHash32(testString, 0, 200, unchecked((int)0xDEADBEEF)));
Assert.Equal(0, SpookyHasher.SpookyHash32(testString, unchecked((int)0xDEADBEEF)));
Assert.Equal(0, SpookyHasher.SpookyHash32(testString, 0, 200));
Assert.Equal(0, SpookyHasher.SpookyHash32(testString));
}
