Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Collections / Specialized / BitVector32.cs / 1 / BitVector32.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Collections.Specialized { using System.Diagnostics; using System.Text; using System; using Microsoft.Win32; ////// public struct BitVector32 { private uint data; ///Provides a simple light bit vector with easy integer or Boolean access to /// a 32 bit storage. ////// public BitVector32(int data) { this.data = (uint)data; } ///Initializes a new instance of the BitVector32 structure with the specified internal data. ////// public BitVector32(BitVector32 value) { this.data = value.data; } ///Initializes a new instance of the BitVector32 structure with the information in the specified /// value. ////// public bool this[int bit] { get { return (data & bit) == (uint)bit; } set { if (value) { data |= (uint)bit; } else { data &= ~(uint)bit; } } } ///Gets or sets a value indicating whether all the specified bits are set. ////// public int this[Section section] { get { return (int)((data & (uint)(section.Mask << section.Offset)) >> section.Offset); } set { #if DEBUG if ((value & section.Mask) != value) { Debug.Fail("Value out of bounds on BitVector32 Section Set!"); } #endif value <<= section.Offset; int offsetMask = (0xFFFF & (int)section.Mask) << section.Offset; data = (data & ~(uint)offsetMask) | ((uint)value & (uint)offsetMask); } } ///Gets or sets the value for the specified section. ////// returns the raw data stored in this bit vector... /// public int Data { get { return (int)data; } } private static short CountBitsSet(short mask) { // yes, I know there are better algorithms, however, we know the // bits are always right aligned, with no holes (i.e. always 00000111, // never 000100011), so this is just fine... // short value = 0; while ((mask & 0x1) != 0) { value++; mask >>= 1; } return value; } ////// public static int CreateMask() { return CreateMask(0); } ///Creates the first mask in a series. ////// Creates the next mask in a series. /// public static int CreateMask(int previous) { if (previous == 0) { return 1; } if (previous == unchecked((int)0x80000000)) { throw new InvalidOperationException(SR.GetString(SR.BitVectorFull)); } return previous << 1; } ////// Given a highValue, creates the mask /// private static short CreateMaskFromHighValue(short highValue) { short required = 16; while ((highValue & 0x8000) == 0) { required--; highValue <<= 1; } ushort value = 0; while (required > 0) { required--; value <<= 1; value |= 0x1; } return unchecked((short) value); } ////// public static Section CreateSection(short maxValue) { return CreateSectionHelper(maxValue, 0, 0); } ///Creates the first section in a series, with the specified maximum value. ////// public static Section CreateSection(short maxValue, Section previous) { return CreateSectionHelper(maxValue, previous.Mask, previous.Offset); } private static Section CreateSectionHelper(short maxValue, short priorMask, short priorOffset) { if (maxValue < 1) { throw new ArgumentException(SR.GetString(SR.Argument_InvalidValue, "maxValue", 0), "maxValue"); } #if DEBUG int maskCheck = CreateMaskFromHighValue(maxValue); int offsetCheck = priorOffset + CountBitsSet(priorMask); Debug.Assert(maskCheck <= short.MaxValue && offsetCheck < 32, "Overflow on BitVector32"); #endif short offset = (short)(priorOffset + CountBitsSet(priorMask)); if (offset >= 32) { throw new InvalidOperationException(SR.GetString(SR.BitVectorFull)); } return new Section(CreateMaskFromHighValue(maxValue), offset); } public override bool Equals(object o) { if (!(o is BitVector32)) { return false; } return data == ((BitVector32)o).data; } public override int GetHashCode() { return base.GetHashCode(); } ///Creates the next section in a series, with the specified maximum value. ////// public static string ToString(BitVector32 value) { StringBuilder sb = new StringBuilder(/*"BitVector32{".Length*/12 + /*32 bits*/32 + /*"}".Length"*/1); sb.Append("BitVector32{"); int locdata = (int)value.data; for (int i=0; i<32; i++) { if ((locdata & 0x80000000) != 0) { sb.Append("1"); } else { sb.Append("0"); } locdata <<= 1; } sb.Append("}"); return sb.ToString(); } ////// public override string ToString() { return BitVector32.ToString(this); } ////// public struct Section { private readonly short mask; private readonly short offset; internal Section(short mask, short offset) { this.mask = mask; this.offset = offset; } public short Mask { get { return mask; } } public short Offset { get { return offset; } } public override bool Equals(object o) { if (o is Section) return Equals((Section)o); else return false; } public bool Equals(Section obj) { return obj.mask == mask && obj.offset == offset; } public static bool operator ==(Section a, Section b) { return a.Equals(b); } public static bool operator !=(Section a, Section b) { return !(a == b); } public override int GetHashCode() { return base.GetHashCode(); } ////// Represents an section of the vector that can contain a integer number. ////// public static string ToString(Section value) { return "Section{0x" + Convert.ToString(value.Mask, 16) + ", 0x" + Convert.ToString(value.Offset, 16) + "}"; } ////// public override string ToString() { return Section.ToString(this); } } } }
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