public void LowBitRandom()
{
fixed(byte *inputPtr = highRepeatRandomInput)
fixed(byte *encodedOutputPtr = highRepeatEncodedOutput)
fixed(byte *outputPtr = highRepeatRandomOutput)
{
int compressedSize = LZ4.Encode64(inputPtr, encodedOutputPtr, highRepeatRandomInput.Length, highRepeatEncodedOutput.Length);
int uncompressedSize = LZ4.Decode64(encodedOutputPtr, compressedSize, outputPtr, highRepeatRandomInput.Length, true);
}
}
public void Setup()
{
var generator = new Random(RandomSeed);
_buffers = new List <Tuple <byte[], int> >();
// Generate the precomputed sequences to be used when generating data.
var sequences = new List <byte[]>();
for (int i = 0; i < NumberOfSequences; i++)
{
int length = generator.Next(1, GeneratedSequenceMaximumLength);
var sequence = new byte[length];
generator.NextBytes(sequence);
sequences.Add(sequence);
}
// Compute the length of the maximum output data. This is an upper bound
// to be able to always use the same buffer for decompression.
int maximumOutputLength = (int)LZ4.MaximumOutputLength(DataMaximumLength);
_lz4Buffer = new byte[maximumOutputLength];
var buffer = new byte[DataMaximumLength];
for (int i = 0; i < NumberOfOperations; i++)
{
var generatedDataLength = generator.Next(DataMaximumLength);
List <int> usedSequences = new List <int>();
for (var j = 0; j < generatedDataLength; j++)
{
bool useSequence = generator.NextDouble() < SequenceUsageProbability;
if (sequences.Count > 0 && useSequence)
{
byte[] sequence;
bool repeatSequence = generator.NextDouble() < SequenceRepetitionProbability;
if (repeatSequence && usedSequences.Count > 0)
{
int index = generator.Next(usedSequences.Count);
sequence = sequences[usedSequences[index]];
}
else
{
int index = generator.Next(sequences.Count);
sequence = sequences[index];
usedSequences.Add(index);
}
fixed(byte *bufferPtr = &buffer[j])
fixed(byte *sequencePtr = sequence)
{
int amount = Math.Min(sequence.Length, generatedDataLength - j);
Unsafe.CopyBlock(bufferPtr, sequencePtr, (uint)amount);
j += amount;
}
}
else
{
var spontaneousSequenceLength = Math.Min(generator.Next(GeneratedSequenceMaximumLength), generatedDataLength - j);
for (int k = 0; k < spontaneousSequenceLength; k++, j++)
{
buffer[j] = (byte)generator.Next(256);
}
}
}
// Flip bytes on the generated sequence, as required
bool flipGeneratedSequence = generator.NextDouble() < DataFlipProbability;
if (flipGeneratedSequence)
{
for (var j = 0; j < generatedDataLength; j++)
{
bool flipGeneratedByte = generator.NextDouble() < DataByteFlipProbability;
if (flipGeneratedByte)
{
buffer[j] ^= (byte)generator.Next(256);
}
}
}
// Calculate compression size and store the generated data
fixed(byte *bufferPtr = buffer)
fixed(byte *lz4buffer = _lz4Buffer)
{
int compressedSize = LZ4.Encode64(bufferPtr, lz4buffer, generatedDataLength, _lz4Buffer.Length);
byte[] unmanagedBuffer = new byte[compressedSize];
fixed(byte *ptr = unmanagedBuffer)
{
Unsafe.CopyBlock(ptr, lz4buffer, (uint)compressedSize);
}
_buffers.Add(new Tuple <byte[], int>(unmanagedBuffer, generatedDataLength));
}
}
}