| using J2N.Numerics; |
| using System; |
| |
| 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. |
| */ |
| |
| /// <summary> |
| /// Non-specialized <see cref="BulkOperation"/> for <see cref="PackedInt32s.Format.PACKED_SINGLE_BLOCK"/>. |
| /// </summary> |
| internal sealed class BulkOperationPackedSingleBlock : BulkOperation |
| { |
| private const int BLOCK_COUNT = 1; |
| |
| private readonly int bitsPerValue; |
| private readonly int valueCount; |
| private readonly long mask; |
| |
| public BulkOperationPackedSingleBlock(int bitsPerValue) |
| { |
| this.bitsPerValue = bitsPerValue; |
| this.valueCount = 64 / bitsPerValue; |
| this.mask = (1L << bitsPerValue) - 1; |
| } |
| |
| /// <summary> |
| /// NOTE: This was longBlockCount() in Lucene. |
| /// </summary> |
| public override sealed int Int64BlockCount => BLOCK_COUNT; |
| |
| public override sealed int ByteBlockCount => BLOCK_COUNT * 8; |
| |
| /// <summary> |
| /// NOTE: This was longValueCount() in Lucene. |
| /// </summary> |
| public override int Int64ValueCount => valueCount; |
| |
| public override sealed int ByteValueCount => valueCount; |
| |
| /// <summary> |
| /// NOTE: This was readLong() in Lucene. |
| /// </summary> |
| private static long ReadInt64(byte[] blocks, int blocksOffset) |
| { |
| return (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 56 | (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 48 | |
| (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 40 | (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 32 | |
| (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 24 | (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 16 | |
| (((sbyte)blocks[blocksOffset++]) & 0xFFL) << 8 | ((sbyte)blocks[blocksOffset++]) & 0xFFL; |
| } |
| |
| private int Decode(long block, long[] values, int valuesOffset) |
| { |
| values[valuesOffset++] = block & mask; |
| for (int j = 1; j < valueCount; ++j) |
| { |
| block = block.TripleShift(bitsPerValue); |
| values[valuesOffset++] = block & mask; |
| } |
| return valuesOffset; |
| } |
| |
| private int Decode(long block, int[] values, int valuesOffset) |
| { |
| values[valuesOffset++] = (int)(block & mask); |
| for (int j = 1; j < valueCount; ++j) |
| { |
| block = block.TripleShift(bitsPerValue); |
| values[valuesOffset++] = (int)(block & mask); |
| } |
| return valuesOffset; |
| } |
| |
| private long Encode(long[] values, int valuesOffset) |
| { |
| long block = values[valuesOffset++]; |
| for (int j = 1; j < valueCount; ++j) |
| { |
| block |= values[valuesOffset++] << (j * bitsPerValue); |
| } |
| return block; |
| } |
| |
| private long Encode(int[] values, int valuesOffset) |
| { |
| long block = values[valuesOffset++] & 0xFFFFFFFFL; |
| for (int j = 1; j < valueCount; ++j) |
| { |
| block |= (values[valuesOffset++] & 0xFFFFFFFFL) << (j * bitsPerValue); |
| } |
| return block; |
| } |
| |
| public override void Decode(long[] blocks, int blocksOffset, long[] values, int valuesOffset, int iterations) |
| { |
| for (int i = 0; i < iterations; ++i) |
| { |
| long block = blocks[blocksOffset++]; |
| valuesOffset = Decode(block, values, valuesOffset); |
| } |
| } |
| |
| public override void Decode(byte[] blocks, int blocksOffset, long[] values, int valuesOffset, int iterations) |
| { |
| for (int i = 0; i < iterations; ++i) |
| { |
| long block = ReadInt64(blocks, blocksOffset); |
| blocksOffset += 8; |
| valuesOffset = Decode(block, values, valuesOffset); |
| } |
| } |
| |
| public override void Decode(long[] blocks, int blocksOffset, int[] values, int valuesOffset, int iterations) |
| { |
| if (bitsPerValue > 32) |
| { |
| throw new NotSupportedException("Cannot decode " + bitsPerValue + "-bits values into an int[]"); |
| } |
| for (int i = 0; i < iterations; ++i) |
| { |
| long block = blocks[blocksOffset++]; |
| valuesOffset = Decode(block, values, valuesOffset); |
| } |
| } |
| |
| public override void Decode(byte[] blocks, int blocksOffset, int[] values, int valuesOffset, int iterations) |
| { |
| if (bitsPerValue > 32) |
| { |
| throw new NotSupportedException("Cannot decode " + bitsPerValue + "-bits values into an int[]"); |
| } |
| for (int i = 0; i < iterations; ++i) |
| { |
| long block = ReadInt64(blocks, blocksOffset); |
| blocksOffset += 8; |
| valuesOffset = Decode(block, values, valuesOffset); |
| } |
| } |
| |
| public override void Encode(long[] values, int valuesOffset, long[] blocks, int blocksOffset, int iterations) |
| { |
| for (int i = 0; i < iterations; ++i) |
| { |
| blocks[blocksOffset++] = Encode(values, valuesOffset); |
| valuesOffset += valueCount; |
| } |
| } |
| |
| public override void Encode(int[] values, int valuesOffset, long[] blocks, int blocksOffset, int iterations) |
| { |
| for (int i = 0; i < iterations; ++i) |
| { |
| blocks[blocksOffset++] = Encode(values, valuesOffset); |
| valuesOffset += valueCount; |
| } |
| } |
| |
| public override void Encode(long[] values, int valuesOffset, byte[] blocks, int blocksOffset, int iterations) |
| { |
| for (int i = 0; i < iterations; ++i) |
| { |
| long block = Encode(values, valuesOffset); |
| valuesOffset += valueCount; |
| blocksOffset = WriteInt64(block, blocks, blocksOffset); |
| } |
| } |
| |
| public override void Encode(int[] values, int valuesOffset, byte[] blocks, int blocksOffset, int iterations) |
| { |
| for (int i = 0; i < iterations; ++i) |
| { |
| long block = Encode(values, valuesOffset); |
| valuesOffset += valueCount; |
| blocksOffset = WriteInt64(block, blocks, blocksOffset); |
| } |
| } |
| } |
| } |