public void SingleBlockXxh32UsingSpanMatchesTheirs(string text)
{
var input = System.Text.Encoding.UTF8.GetBytes(text);
var expected = Theirs32(input);
var actual = XXHash32.DigestOf(input.AsSpan());
Assert.Equal(expected, actual);
}
public void HashAlgorithmWrapperReturnsSameResults(int seed, int length)
{
var bytes = new byte[length];
new Random(seed).NextBytes(bytes);
var expected = XXHash32.DigestOf(bytes, 0, bytes.Length);
//var actual = new XXHash32().AsHashAlgorithm().ComputeHash(bytes);
var actual = ((HashAlgorithm) new XXHash32()).ComputeHash(bytes);
Assert.Equal(expected, BitConverter.ToUInt32(actual, 0));
}
private void ReadFrame()
{
Read0();
uint? magic = TryRead32();
if (magic != 0x184D2204)
throw new InvalidDataException(RS.ExpectLZ4MagicNumber);
Read0();
ushort flgBd = Read16();
int flg = flgBd & 0xFF;
int bd = (flgBd >> 8) & 0xFF;
int version = (flg >> 6) & 0x11;
if (version != 1)
throw new InvalidDataException(string.Format(RS.LZ4VersionNotSupported, version));
bool blockChaining = ((flg >> 5) & 0x01) == 0;
bool blockChecksum = ((flg >> 4) & 0x01) != 0;
bool hasContentSize = ((flg >> 3) & 0x01) != 0;
bool contentChecksum = ((flg >> 2) & 0x01) != 0;
bool hasDictionary = (flg & 0x01) != 0;
int blockSizeCode = (bd >> 4) & 0x07;
long? contentLength = hasContentSize ? (long?) Read64() : null;
uint? dictionaryId = hasDictionary ? (uint?) Read32() : null;
byte actualHC = (byte)(XXHash32.DigestOf(_buffer16, 0, _index16) >> 8);
byte expectedHC = Read8();
if (actualHC != expectedHC)
throw new InvalidDataException(RS.BadLZ4FrameHeaderChecksum);
int blockSize = MaxBlockSize(blockSizeCode);
if (hasDictionary)
{
// Write32(dictionaryId);
throw new NotImplementedException(string.Format(RS.FeatureNotImplementedInType, "Predefined Dictionaries", GetType().Name));
}
_frameInfo = new LZ4FrameDescriptor(contentLength, contentChecksum, blockChaining, blockChecksum, dictionaryId, blockSize);
_decoder = _decoderFactory(_frameInfo);
_buffer = new byte[blockSize];
}
private void WriteFrame()
{
Write32(0x184D2204);
Flush16();
const int versionCode = 0x01;
bool blockChaining = _descriptor.Chaining;
bool blockChecksum = _descriptor.BlockChecksum;
bool contentChecksum = _descriptor.ContentChecksum;
bool hasContentSize = _descriptor.ContentLength.HasValue;
bool hasDictionary = _descriptor.Dictionary.HasValue;
int flg = (versionCode << 6) |
((blockChaining ? 0 : 1) << 5) |
((blockChecksum ? 1 : 0) << 4) |
((hasContentSize ? 1 : 0) << 3) |
((contentChecksum ? 1 : 0) << 2) |
(hasDictionary ? 1 : 0);
int blockSize = _descriptor.BlockSize;
int bd = MaxBlockSizeCode(blockSize) << 4;
Write16((ushort) ((flg & 0xFF) | (bd & 0xFF) << 8));
if (hasContentSize)
{
// Write64(contentSize)
throw new NotImplementedException(string.Format(RS.FeatureNotImplementedInType, "Content Size", GetType().Name));
}
if (hasDictionary)
{
// Write32(dictionaryId)
throw new NotImplementedException(string.Format(RS.FeatureNotImplementedInType, "Predefined Dictionaries", GetType().Name));
}
byte hc = (byte)(XXHash32.DigestOf(_buffer16, 0, _index16) >> 8);
Write8(hc);
Flush16();
_encoder = CreateEncoder();
_buffer = new byte[LZ4Codec.MaximumOutputSize(blockSize)];
}
public void EveryCallToDigestReturnsSameHash(int seed, int length)
{
var random = new Random(seed);
var bytes = new byte[length];
random.NextBytes(bytes);
var expected = XXHash32.DigestOf(bytes, 0, bytes.Length);
var transform = new XXHash32();
transform.Update(bytes, 0, length);
for (var i = 0; i < 100; i++)
{
Assert.Equal(expected, transform.Digest());
}
}
public unsafe void EmptyHash()
{
var input = Array.Empty <byte>();
var expected = Theirs32(input);
var actual1 = XXHash32.DigestOf(input, 0, input.Length);
Assert.Equal(expected, actual1);
fixed(byte *inputPtr = input)
{
var actual2 = XXHash32.DigestOf(inputPtr, 0);
Assert.Equal(expected, actual2);
}
var actual3 = XXHash32.EmptyHash;
Assert.Equal(expected, actual3);
}
public void RestartableHashReturnsSameResultsAsSingleBlock(int seed, int length, int chunk)
{
var random = new Random(seed);
var bytes = new byte[length];
random.NextBytes(bytes);
var expected = XXHash32.DigestOf(bytes, 0, bytes.Length);
var transform = new XXHash32();
var index = 0;
while (index < length)
{
var l = Math.Min(chunk, length - index);
transform.Update(bytes, index, l);
index += l;
}
var actual = transform.Digest();
Assert.Equal(expected, actual);
}
