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//
// System.Collections.Specialized.BitVector32.cs
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Lawrence Pit (loz@cable.a2000.nl)
//
// (C) Ximian, Inc. http://www.ximian.com
//
using System;
using System.Text;
namespace System.Collections.Specialized {
public struct BitVector32 {
int bits;
public struct Section {
private short mask;
private 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 false;
Section section = (Section) o;
return this.mask == section.mask &&
this.offset == section.offset;
}
public override int GetHashCode ()
{
return (((Int16) mask).GetHashCode () << 16) +
((Int16) offset).GetHashCode ();
}
public override string ToString ()
{
return "Section{0x" + Convert.ToString(mask, 16) +
", 0x" + Convert.ToString(offset, 16) + "}";
}
}
// Constructors
public BitVector32 (BitVector32 source)
{
bits = source.bits;
}
public BitVector32 (int init)
{
bits = init;
}
// Properties
public int Data {
get { return bits; }
}
public int this [BitVector32.Section section] {
get {
return ((bits >> section.Offset) & section.Mask);
}
set {
if (value < 0)
throw new ArgumentException ("Section can't hold negative values");
if (value > section.Mask)
throw new ArgumentException ("Value too large to fit in section");
bits &= (~section.Mask << section.Offset);
bits |= (value << section.Offset);
}
}
public bool this [int mask] {
get {
return (bits & mask) == mask;
}
set {
if (value)
bits |= mask;
else
bits &= ~mask;
}
}
// Methods
public static int CreateMask ()
{
return 1;
}
public static int CreateMask (int prev)
{
if (prev == 0)
return 1;
if (prev == Int32.MinValue)
throw new InvalidOperationException ("all bits set");
return prev << 1;
}
public static Section CreateSection (short maxValue)
{
return CreateSection (maxValue, new Section (0, 0));
}
public static Section CreateSection (short maxValue, BitVector32.Section previous)
{
if (maxValue < 1)
throw new ArgumentException ("maxValue");
int newmask = (int) maxValue;
int mask = 0x8000;
while ((newmask & mask) == 0)
mask >>= 1;
while (mask > 0) {
newmask |= mask;
mask >>= 1;
}
short count = 0;
int prev = previous.Mask;
mask = 0x8000;
while (mask > 0) {
if ((prev & mask) != 0)
count++;
mask >>= 1;
}
return new Section ((short) newmask, (short) (previous.Offset + count));
}
public override bool Equals (object o)
{
if (!(o is BitVector32))
return false;
return bits == ((BitVector32) o).bits;
}
public override int GetHashCode ()
{
return bits.GetHashCode ();
}
public override string ToString ()
{
return ToString (this);
}
public static string ToString (BitVector32 value)
{
StringBuilder b = new StringBuilder ();
b.Append ("BitVector32{");
long mask = (long) 0x80000000;
while (mask > 0) {
b.Append (((value.bits & mask) == 0) ? '0' : '1');
mask >>= 1;
}
b.Append ('}');
return b.ToString ();
}
}
}
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