| using System; |
| using System.IO; |
| |
| namespace Lucene.Net.Util.Packed |
| { |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| using IndexInput = Lucene.Net.Store.IndexInput; |
| |
| internal sealed class DirectPacked64SingleBlockReader : PackedInt32s.ReaderImpl |
| { |
| private readonly IndexInput @in; |
| private readonly long startPointer; |
| private readonly int valuesPerBlock; |
| private readonly long mask; |
| |
| internal DirectPacked64SingleBlockReader(int bitsPerValue, int valueCount, IndexInput @in) |
| : base(valueCount, bitsPerValue) |
| { |
| this.@in = @in; |
| startPointer = @in.GetFilePointer(); |
| valuesPerBlock = 64 / bitsPerValue; |
| mask = ~(~0L << bitsPerValue); |
| } |
| |
| public override long Get(int index) |
| { |
| int blockOffset = index / valuesPerBlock; |
| long skip = ((long)blockOffset) << 3; |
| try |
| { |
| @in.Seek(startPointer + skip); |
| |
| long block = @in.ReadInt64(); |
| int offsetInBlock = index % valuesPerBlock; |
| return ((long)((ulong)block >> (offsetInBlock * m_bitsPerValue))) & mask; |
| } |
| catch (IOException e) |
| { |
| throw new InvalidOperationException("failed", e); |
| } |
| } |
| |
| public override long RamBytesUsed() |
| { |
| return 0; |
| } |
| } |
| } |