Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / Xml / System / Xml / BitStack.cs / 1 / BitStack.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml { using System; using System.Diagnostics; ////// Manages a stack of bits. Exposes push, pop, and peek operations. /// internal class BitStack { private uint[] bitStack; private int stackPos; private uint curr; ////// Initialize stack. /// public BitStack() { // Set sentinel bit in 1st position. As bits are shifted onto this.curr, this sentinel // bit shifts to the left. When it's about to overflow, this.curr will be pushed // onto an unsigned int stack and the sentinel bit will be reset to 0x1. this.curr = 0x1; } ////// Push a 0 or 1 bit onto the stack. /// public void PushBit(bool bit) { if ((this.curr & 0x80000000) != 0) { // If sentinel bit has reached the last position, push this.curr PushCurr(); } // Shift new bit onto this.curr (which must have at least one open position) this.curr = (this.curr << 1) | (bit ? 1u : 0u); } ////// Pop the top bit from the stack and return it. /// public bool PopBit() { bool bit; Debug.Assert(this.curr != 0x1, "Stack empty"); // Shift rightmost bit from this.curr bit = (this.curr & 0x1) != 0; this.curr >>= 1; if (this.curr == 0x1) { // If sentinel bit has reached the rightmost position, pop this.curr PopCurr(); } return bit; } ////// Return the top bit on the stack without pushing or popping. /// public bool PeekBit() { Debug.Assert(this.curr != 0x1, "Stack empty"); return (this.curr & 0x1) != 0; } ////// Return true if there are currently no bits on the stack. /// public bool IsEmpty { get { return this.curr == 0x1; } } ////// this.curr has enough space for 31 bits (minus 1 for sentinel bit). Once this space is /// exhausted, a uint stack is created to handle the overflow. /// private void PushCurr() { int len; if (this.bitStack == null) { this.bitStack = new uint[16]; } // Push current unsigned int (which has been filled) onto a stack // and initialize this.curr to be used for this.bitStack[this.stackPos++] = this.curr; this.curr = 0x1; // Resize stack if necessary len = this.bitStack.Length; if (this.stackPos >= len) { uint[] bitStackNew = new uint[2 * len]; Array.Copy(this.bitStack, bitStackNew, len); this.bitStack = bitStackNew; } } ////// If all bits have been popped from this.curr, then pop the previous uint value from the stack in /// order to provide another 31 bits. /// private void PopCurr() { if (this.stackPos > 0) this.curr = this.bitStack[--this.stackPos]; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WindowsAuthenticationEventArgs.cs
- SmiEventSink_Default.cs
- Configuration.cs
- Compilation.cs
- CheckableControlBaseAdapter.cs
- EventHandlingScope.cs
- ConcurrentQueue.cs
- StringSource.cs
- TableCell.cs
- Pair.cs
- SmiContextFactory.cs
- GraphicsPath.cs
- ExtractedStateEntry.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- Parallel.cs
- PtsCache.cs
- LayoutManager.cs
- LayoutEvent.cs
- SoapExtension.cs
- PageThemeParser.cs
- ResourceDescriptionAttribute.cs
- Error.cs
- Queue.cs
- AsyncStreamReader.cs
- RangeExpression.cs
- XmlSchemaGroup.cs
- CapiSymmetricAlgorithm.cs
- HierarchicalDataBoundControlAdapter.cs
- CaretElement.cs
- FileDataSourceCache.cs
- ProjectionNode.cs
- InstanceData.cs
- TdsParserSafeHandles.cs
- ToolboxItemFilterAttribute.cs
- EventArgs.cs
- PeerMaintainer.cs
- Nullable.cs
- RepeaterItemEventArgs.cs
- FilterInvalidBodyAccessException.cs
- NullRuntimeConfig.cs
- MemoryFailPoint.cs
- TextRangeProviderWrapper.cs
- PerformanceCounterManager.cs
- SystemIPInterfaceProperties.cs
- FontUnitConverter.cs
- MoveSizeWinEventHandler.cs
- PackageDigitalSignature.cs
- WindowsBrush.cs
- BezierSegment.cs
- FaultReasonText.cs
- DayRenderEvent.cs
- TypeDelegator.cs
- Registry.cs
- MenuBase.cs
- WaitHandle.cs
- DataGridViewUtilities.cs
- PackageRelationshipSelector.cs
- SqlDataSource.cs
- BreakRecordTable.cs
- HttpProfileBase.cs
- _LoggingObject.cs
- ApplicationActivator.cs
- MediaTimeline.cs
- _TransmitFileOverlappedAsyncResult.cs
- CardSpaceSelector.cs
- QuaternionKeyFrameCollection.cs
- XpsFilter.cs
- PaintEvent.cs
- OdbcConnectionString.cs
- CollectionMarkupSerializer.cs
- XmlNamespaceMapping.cs
- DataTemplateKey.cs
- DefaultBindingPropertyAttribute.cs
- LabelEditEvent.cs
- Stopwatch.cs
- ArgumentReference.cs
- UserNameSecurityTokenAuthenticator.cs
- CodeConditionStatement.cs
- OuterGlowBitmapEffect.cs
- DoubleConverter.cs
- HostSecurityManager.cs
- List.cs
- MergeLocalizationDirectives.cs
- GridProviderWrapper.cs
- AdapterUtil.cs
- SqlClientWrapperSmiStreamChars.cs
- AnnotationAuthorChangedEventArgs.cs
- _CommandStream.cs
- GcHandle.cs
- ValueHandle.cs
- SerialPinChanges.cs
- DataSourceDescriptorCollection.cs
- CopyOfAction.cs
- WebPartHeaderCloseVerb.cs
- InkCanvasFeedbackAdorner.cs
- LedgerEntryCollection.cs
- ConfigurationException.cs
- ReceiveActivity.cs
- ClientProxyGenerator.cs
- _HelperAsyncResults.cs