112 lines
2.9 KiB
C#
112 lines
2.9 KiB
C#
/*
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Copyright (c) Microsoft Corporation
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All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
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compliance with the License. You may obtain a copy of the License
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at http://www.apache.org/licenses/LICENSE-2.0
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THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER
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EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
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TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
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See the Apache Version 2.0 License for specific language governing permissions and
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limitations under the License.
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*/
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using System;
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using Microsoft.Research.DryadLinq;
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namespace Microsoft.Research.DryadLinq.Internal
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{
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public struct BitVector
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{
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private byte[] m_array;
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public BitVector(int length)
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{
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this.m_array = new byte[(length + 7) / 8];
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}
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public BitVector(bool[] values)
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{
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this.m_array = new byte[(values.Length + 7) / 8];
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for (int i = 0; i < values.Length; i++)
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{
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if (values[i])
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{
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m_array[i / 8] |= (byte)(1 << (i % 8));
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}
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}
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}
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private BitVector(byte[] values)
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{
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this.m_array = values;
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}
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public bool this[int index]
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{
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get { return this.Get(index); }
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}
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public bool Get(int index)
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{
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int idx = index / 8;
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return ((idx < this.m_array.Length) &&
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(this.m_array[idx] & (1 << (index % 8))) != 0);
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}
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public void Set(int index)
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{
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m_array[index / 8] |= (byte)(1 << (index % 8));
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}
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public void SetAll(bool value)
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{
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byte fillValue = 0;
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if (value) fillValue = 0xff;
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for (int i = 0; i < this.m_array.Length; i++)
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{
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this.m_array[i] = fillValue;
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}
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}
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private void WriteInner(DryadLinqBinaryWriter writer)
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{
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int len;
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for (len = this.m_array.Length - 1; len >= 0; len--)
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{
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if (this.m_array[len] != 0) break;
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}
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len++;
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writer.WriteCompact(len);
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for (int i = 0; i < len; i++)
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{
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writer.Write(this.m_array[i]);
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}
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}
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public static BitVector Read(DryadLinqBinaryReader reader)
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{
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Int32 len = reader.ReadCompactInt32();
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byte[] values = new byte[len];
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for (int i = 0; i < len; i++)
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{
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values[i] = reader.ReadUByte();
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}
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return new BitVector(values);
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}
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public static void Write(DryadLinqBinaryWriter writer, BitVector bv)
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{
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bv.WriteInner(writer);
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}
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}
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}
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