77 lines
1.5 KiB
C#
77 lines
1.5 KiB
C#
using System;
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namespace System.Runtime.Serialization
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{
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class BitFlagsGenerator
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{
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int bitCount;
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byte [] locals;
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public BitFlagsGenerator (int bitCount)
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{
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this.bitCount = bitCount;
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int localCount = (bitCount+7)/8;
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locals = new byte [localCount];
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}
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public void Store (int bitIndex, bool value)
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{
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if (value)
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locals [GetByteIndex (bitIndex)] |= GetBitValue(bitIndex);
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else
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locals [GetByteIndex (bitIndex)] &= (byte) ~GetBitValue(bitIndex);
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}
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public bool Load (int bitIndex)
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{
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var local = locals[GetByteIndex(bitIndex)];
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byte bitValue = GetBitValue(bitIndex);
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return (local & bitValue) == bitValue;
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}
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public byte [] LoadArray ()
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{
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return (byte []) locals.Clone ();
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}
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public int GetLocalCount ()
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{
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return locals.Length;
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}
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public int GetBitCount ()
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{
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return bitCount;
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}
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public byte GetLocal (int i)
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{
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return locals [i];
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}
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public static bool IsBitSet (byte[] bytes, int bitIndex)
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{
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int byteIndex = GetByteIndex (bitIndex);
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byte bitValue = GetBitValue (bitIndex);
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return (bytes[byteIndex] & bitValue) == bitValue;
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}
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public static void SetBit (byte[] bytes, int bitIndex)
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{
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int byteIndex = GetByteIndex (bitIndex);
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byte bitValue = GetBitValue (bitIndex);
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bytes[byteIndex] |= bitValue;
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}
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static int GetByteIndex (int bitIndex)
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{
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return bitIndex >> 3;
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}
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static byte GetBitValue (int bitIndex)
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{
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return (byte)(1 << (bitIndex & 7));
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}
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}
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}
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