protected void WriteValues(int bitsRequired)
{
PackedInt32s.IEncoder encoder = PackedInt32s.GetEncoder(PackedInt32s.Format.PACKED, PackedInt32s.VERSION_CURRENT, bitsRequired);
int iterations = m_values.Length / encoder.ByteValueCount;
int blockSize = encoder.ByteBlockCount * iterations;
if (m_blocks is null || m_blocks.Length < blockSize)
{
m_blocks = new byte[blockSize];
}
if (m_off < m_values.Length)
{
Arrays.Fill(m_values, m_off, m_values.Length, 0L);
}
encoder.Encode(m_values, 0, m_blocks, 0, iterations);
int blockCount = (int)PackedInt32s.Format.PACKED.ByteCount(PackedInt32s.VERSION_CURRENT, m_off, bitsRequired);
m_out.WriteBytes(m_blocks, blockCount);
}
internal virtual void PforEncode()
{
if (numExceptions > 0)
{
int mask = (1 << bitsPerValue) - 1;
int ex = 0;
for (int i = 0; i < bufferSize; ++i)
{
if (buffer[i] > mask)
{
exceptionIndices[ex] = i;
exceptions[ex++] = (int)((uint)buffer[i] >> bitsPerValue);
buffer[i] &= mask;
}
}
Debug.Assert(ex == numExceptions);
Arrays.Fill(exceptions, numExceptions, BLOCK_SIZE, 0);
}
if (bitsPerValue > 0)
{
PackedInt32s.IEncoder encoder = PackedInt32s.GetEncoder(PackedInt32s.Format.PACKED, PackedInt32s.VERSION_CURRENT, bitsPerValue);
int numIterations = ITERATIONS[bitsPerValue];
encoder.Encode(buffer, 0, data.Bytes, data.Length, numIterations);
data.Length += encoder.ByteBlockCount * numIterations;
}
if (numExceptions > 0)
{
Debug.Assert(bitsPerException > 0);
data.WriteByte((byte)(sbyte)numExceptions);
data.WriteByte((byte)(sbyte)bitsPerException);
PackedInt32s.IEncoder encoder = PackedInt32s.GetEncoder(PackedInt32s.Format.PACKED, PackedInt32s.VERSION_CURRENT, bitsPerException);
int numIterations = (numExceptions + encoder.ByteValueCount - 1) / encoder.ByteValueCount;
encoder.Encode(exceptions, 0, data.Bytes, data.Length, numIterations);
data.Length += (int)PackedInt32s.Format.PACKED.ByteCount(PackedInt32s.VERSION_CURRENT, numExceptions, bitsPerException);
for (int i = 0; i < numExceptions; ++i)
{
data.WriteByte((byte)(sbyte)exceptionIndices[i]);
}
}
}
/// <summary>
/// Create a new <see cref="ForUtil"/> instance and save state into <paramref name="out"/>.
/// </summary>
internal ForUtil(float acceptableOverheadRatio, DataOutput @out)
{
@out.WriteVInt32(PackedInt32s.VERSION_CURRENT);
encodedSizes = new int[33];
encoders = new PackedInt32s.IEncoder[33];
decoders = new PackedInt32s.IDecoder[33];
iterations = new int[33];
for (int bpv = 1; bpv <= 32; ++bpv)
{
PackedInt32s.FormatAndBits formatAndBits = PackedInt32s.FastestFormatAndBits(Lucene41PostingsFormat.BLOCK_SIZE, bpv, acceptableOverheadRatio);
Debug.Assert(formatAndBits.Format.IsSupported(formatAndBits.BitsPerValue));
Debug.Assert(formatAndBits.BitsPerValue <= 32);
encodedSizes[bpv] = EncodedSize(formatAndBits.Format, PackedInt32s.VERSION_CURRENT, formatAndBits.BitsPerValue);
encoders[bpv] = PackedInt32s.GetEncoder(formatAndBits.Format, PackedInt32s.VERSION_CURRENT, formatAndBits.BitsPerValue);
decoders[bpv] = PackedInt32s.GetDecoder(formatAndBits.Format, PackedInt32s.VERSION_CURRENT, formatAndBits.BitsPerValue);
iterations[bpv] = ComputeIterations(decoders[bpv]);
@out.WriteVInt32(formatAndBits.Format.Id << 5 | (formatAndBits.BitsPerValue - 1));
}
}
/// <summary>
/// Restore a <see cref="ForUtil"/> from a <see cref="DataInput"/>.
/// </summary>
internal ForUtil(DataInput @in)
{
int packedIntsVersion = @in.ReadVInt32();
PackedInt32s.CheckVersion(packedIntsVersion);
encodedSizes = new int[33];
encoders = new PackedInt32s.IEncoder[33];
decoders = new PackedInt32s.IDecoder[33];
iterations = new int[33];
for (int bpv = 1; bpv <= 32; ++bpv)
{
var code = @in.ReadVInt32();
var formatId = (int)((uint)code >> 5);
var bitsPerValue = (code & 31) + 1;
PackedInt32s.Format format = PackedInt32s.Format.ById(formatId);
Debug.Assert(format.IsSupported(bitsPerValue));
encodedSizes[bpv] = EncodedSize(format, packedIntsVersion, bitsPerValue);
encoders[bpv] = PackedInt32s.GetEncoder(format, packedIntsVersion, bitsPerValue);
decoders[bpv] = PackedInt32s.GetDecoder(format, packedIntsVersion, bitsPerValue);
iterations[bpv] = ComputeIterations(decoders[bpv]);
}
}