Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / BitArray.cs / 1 / BitArray.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================================== ** ** Class: BitArray ** ** ** Purpose: The BitArray class manages a compact array of bit values. ** ** =============================================================================*/ namespace System.Collections { using System; using System.Security.Permissions; // A vector of bits. Use this to store bits efficiently, without having to do bit // shifting yourself. [System.Runtime.InteropServices.ComVisible(true)] [Serializable()] public sealed class BitArray : ICollection, ICloneable { private BitArray() { } /*========================================================================= ** Allocates space to hold length bit values. All of the values in the bit ** array are set to false. ** ** Exceptions: ArgumentException if length < 0. =========================================================================*/ public BitArray(int length) : this(length, false) { } /*========================================================================= ** Allocates space to hold length bit values. All of the values in the bit ** array are set to defaultValue. ** ** Exceptions: ArgumentOutOfRangeException if length < 0. =========================================================================*/ public BitArray(int length, bool defaultValue) { if (length < 0) { throw new ArgumentOutOfRangeException("length", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); } m_array = new int[(length + 31) / 32]; m_length = length; int fillValue = defaultValue ? unchecked(((int)0xffffffff)) : 0; for (int i = 0; i < m_array.Length; i++) { m_array[i] = fillValue; } _version = 0; } /*========================================================================= ** Allocates space to hold the bit values in bytes. bytes[0] represents ** bits 0 - 7, bytes[1] represents bits 8 - 15, etc. The LSB of each byte ** represents the lowest index value; bytes[0] & 1 represents bit 0, ** bytes[0] & 2 represents bit 1, bytes[0] & 4 represents bit 2, etc. ** ** Exceptions: ArgumentException if bytes == null. =========================================================================*/ public BitArray(byte[] bytes) { if (bytes == null) { throw new ArgumentNullException("bytes"); } m_array = new int[(bytes.Length + 3) / 4]; m_length = bytes.Length * 8; int i = 0; int j = 0; while (bytes.Length - j >= 4) { m_array[i++] = (bytes[j] & 0xff) | ((bytes[j + 1] & 0xff) << 8) | ((bytes[j + 2] & 0xff) << 16) | ((bytes[j + 3] & 0xff) << 24); j += 4; } BCLDebug.Assert(bytes.Length - j >= 0, "BitArray byteLength problem"); BCLDebug.Assert(bytes.Length - j < 4, "BitArray byteLength problem #2"); switch (bytes.Length - j) { case 3: m_array[i] = ((bytes[j + 2] & 0xff) << 16); goto case 2; // fall through case 2: m_array[i] |= ((bytes[j + 1] & 0xff) << 8); goto case 1; // fall through case 1: m_array[i] |= (bytes[j] & 0xff); break; } _version = 0; } public BitArray(bool[] values) { if (values == null) { throw new ArgumentNullException("values"); } m_array = new int[(values.Length + 31) / 32]; m_length = values.Length; for (int i = 0;i= GetLength(). =========================================================================*/ public bool Get(int index) { if (index < 0 || index >= m_length) { throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index")); } return (m_array[index / 32] & (1 << (index % 32))) != 0; } /*========================================================================== ** Sets the bit value at position index to value. ** ** Exceptions: ArgumentOutOfRangeException if index < 0 or ** index >= GetLength(). =========================================================================*/ public void Set(int index, bool value) { if (index < 0 || index >= m_length) { throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index")); } if (value) { m_array[index / 32] |= (1 << (index % 32)); } else { m_array[index / 32] &= ~(1 << (index % 32)); } _version++; } /*========================================================================= ** Sets all the bit values to value. =========================================================================*/ public void SetAll(bool value) { int fillValue = value ? unchecked(((int)0xffffffff)) : 0; int ints = (m_length + 31) / 32; for (int i = 0; i < ints; i++) { m_array[i] = fillValue; } _version++; } /*========================================================================== ** Returns a reference to the current instance ANDed with value. ** ** Exceptions: ArgumentException if value == null or ** value.Length != this.Length. =========================================================================*/ public BitArray And(BitArray value) { if (value==null) throw new ArgumentNullException("value"); if (m_length != value.m_length) throw new ArgumentException(Environment.GetResourceString("Arg_ArrayLengthsDiffer")); int ints = (m_length + 31) / 32; for (int i = 0; i < ints; i++) { m_array[i] &= value.m_array[i]; } _version++; return this; } /*========================================================================= ** Returns a reference to the current instance ORed with value. ** ** Exceptions: ArgumentException if value == null or ** value.Length != this.Length. =========================================================================*/ public BitArray Or(BitArray value) { if (value==null) throw new ArgumentNullException("value"); if (m_length != value.m_length) throw new ArgumentException(Environment.GetResourceString("Arg_ArrayLengthsDiffer")); int ints = (m_length + 31) / 32; for (int i = 0; i < ints; i++) { m_array[i] |= value.m_array[i]; } _version++; return this; } /*========================================================================= ** Returns a reference to the current instance XORed with value. ** ** Exceptions: ArgumentException if value == null or ** value.Length != this.Length. =========================================================================*/ public BitArray Xor(BitArray value) { if (value==null) throw new ArgumentNullException("value"); if (m_length != value.m_length) throw new ArgumentException(Environment.GetResourceString("Arg_ArrayLengthsDiffer")); int ints = (m_length + 31) / 32; for (int i = 0; i < ints; i++) { m_array[i] ^= value.m_array[i]; } _version++; return this; } /*========================================================================= ** Inverts all the bit values. On/true bit values are converted to ** off/false. Off/false bit values are turned on/true. The current instance ** is updated and returned. =========================================================================*/ public BitArray Not() { int ints = (m_length + 31) / 32; for (int i = 0; i < ints; i++) { m_array[i] = ~m_array[i]; } _version++; return this; } public int Length { get { return m_length; } set { if (value < 0) { throw new ArgumentOutOfRangeException("value", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); } int newints = (value + 31) / 32; if (newints > m_array.Length || newints + _ShrinkThreshold < m_array.Length) { // grow or shrink (if wasting more than _ShrinkThreshold ints) int[] newarray = new int[newints]; Array.Copy(m_array, newarray, newints > m_array.Length ? m_array.Length : newints); m_array = newarray; } if (value > m_length) { // clear high bit values in the last int int last = ((m_length + 31) / 32) - 1; int bits = m_length % 32; if (bits > 0) { m_array[last] &= (1 << bits) - 1; } // clear remaining int values Array.Clear(m_array, last + 1, newints - last - 1); } m_length = value; _version++; } } // ICollection implementation public void CopyTo(Array array, int index) { if (array == null) throw new ArgumentNullException("array"); if (index < 0) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (array.Rank != 1) throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); if (array is int[]) { Array.Copy(m_array, 0, array, index, (m_length + 31) / 32); } else if (array is byte[]) { if ((array.Length - index) < (m_length + 7)/8) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); byte [] b = (byte[])array; for (int i = 0; i<(m_length + 7)/8;i++) b[index + i] = (byte)((m_array[i/4] >> ((i%4)*8)) & 0x000000FF); // Shift to bring the required byte to LSB, then mask } else if (array is bool[]) { if (array.Length - index < m_length) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); bool [] b = (bool[])array; for (int i = 0;i > (i%32)) & 0x00000001) != 0; } else throw new ArgumentException(Environment.GetResourceString("Arg_BitArrayTypeUnsupported")); } public int Count { get { return m_length; } } public Object Clone() { BitArray bitArray = new BitArray(m_array); bitArray._version = _version; bitArray.m_length = m_length; return bitArray; } public Object SyncRoot { get { if( _syncRoot == null) { System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); } return _syncRoot; } } public bool IsReadOnly { get { return false; } } public bool IsSynchronized { get { return false; } } public IEnumerator GetEnumerator() { return new BitArrayEnumeratorSimple(this); } [Serializable()] private class BitArrayEnumeratorSimple : IEnumerator, ICloneable { private BitArray bitarray; private int index; private int version; private bool currentElement; internal BitArrayEnumeratorSimple(BitArray bitarray) { this.bitarray = bitarray; this.index = -1; version = bitarray._version; } public Object Clone() { return MemberwiseClone(); } public virtual bool MoveNext() { if (version != bitarray._version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion)); if (index < (bitarray.Count-1)) { index++; currentElement = bitarray.Get(index); return true; } else index = bitarray.Count; return false; } public virtual Object Current { get { if (index == -1) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumNotStarted)); if (index >= bitarray.Count) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumEnded)); return currentElement; } } public void Reset() { if (version != bitarray._version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion)); index = -1; } } private int[] m_array; private int m_length; private int _version; [NonSerialized] private Object _syncRoot; private const int _ShrinkThreshold = 256; } }
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