public override long Get(long index) { Debug.Assert(index >= 0 && index < valueCount); int block = (int)((long)((ulong)index >> blockShift)); int idx = (int)(index & blockMask); return(minValues[block] + (long)(idx * averages[block]) + BlockPackedReaderIterator.ZigZagDecode(subReaders[block].Get(idx))); }
public override long Get(long index) { Debug.Assert(index >= 0 && index < valueCount); int block = (int)((long)((ulong)index >> blockShift)); int idx = (int)(index & blockMask); // LUCENENET NOTE: IMPORTANT: The cast to float is critical here for it to work in x86 return(minValues[block] + (long)(float)(idx * averages[block]) + BlockPackedReaderIterator.ZigZagDecode(subReaders[block].Get(idx))); }
/// <summary> /// Sole constructor. </summary> public BlockPackedReader(IndexInput @in, int packedIntsVersion, int blockSize, long valueCount, bool direct) { this.valueCount = valueCount; blockShift = PackedInt32s.CheckBlockSize(blockSize, AbstractBlockPackedWriter.MIN_BLOCK_SIZE, AbstractBlockPackedWriter.MAX_BLOCK_SIZE); blockMask = blockSize - 1; int numBlocks = PackedInt32s.NumBlocks(valueCount, blockSize); long[] minValues = null; subReaders = new PackedInt32s.Reader[numBlocks]; for (int i = 0; i < numBlocks; ++i) { int token = @in.ReadByte() & 0xFF; int bitsPerValue = token.TripleShift(AbstractBlockPackedWriter.BPV_SHIFT); if (bitsPerValue > 64) { throw new Exception("Corrupted"); } if ((token & AbstractBlockPackedWriter.MIN_VALUE_EQUALS_0) == 0) { if (minValues == null) { minValues = new long[numBlocks]; } minValues[i] = BlockPackedReaderIterator.ZigZagDecode(1L + BlockPackedReaderIterator.ReadVInt64(@in)); } if (bitsPerValue == 0) { subReaders[i] = new PackedInt32s.NullReader(blockSize); } else { int size = (int)Math.Min(blockSize, valueCount - (long)i * blockSize); if (direct) { long pointer = @in.GetFilePointer(); subReaders[i] = PackedInt32s.GetDirectReaderNoHeader(@in, PackedInt32s.Format.PACKED, packedIntsVersion, size, bitsPerValue); @in.Seek(pointer + PackedInt32s.Format.PACKED.ByteCount(packedIntsVersion, size, bitsPerValue)); } else { subReaders[i] = PackedInt32s.GetReaderNoHeader(@in, PackedInt32s.Format.PACKED, packedIntsVersion, size, bitsPerValue); } } } this.minValues = minValues; }