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
- WindowsServiceElement.cs
- QueryStringParameter.cs
- ZipIOBlockManager.cs
- ExceptionValidationRule.cs
- _KerberosClient.cs
- TextLine.cs
- NativeMethods.cs
- RoutedEvent.cs
- TypeDescriptor.cs
- File.cs
- ContainerAction.cs
- namescope.cs
- Substitution.cs
- SqlGatherConsumedAliases.cs
- ModuleBuilderData.cs
- ScaleTransform.cs
- CustomAttributeSerializer.cs
- TagElement.cs
- HtmlTitle.cs
- CallbackWrapper.cs
- SynchronizationScope.cs
- RunClient.cs
- PreviewControlDesigner.cs
- X509ThumbprintKeyIdentifierClause.cs
- InternalBase.cs
- XmlStringTable.cs
- MetadataCollection.cs
- ServiceNotStartedException.cs
- DataBindEngine.cs
- ProofTokenCryptoHandle.cs
- RIPEMD160.cs
- documentsequencetextpointer.cs
- COM2ICategorizePropertiesHandler.cs
- BitmapEffectCollection.cs
- Lasso.cs
- SoapAttributeAttribute.cs
- StringComparer.cs
- TimeSpanValidatorAttribute.cs
- EntityAdapter.cs
- BaseHashHelper.cs
- WsatRegistrationHeader.cs
- Serializer.cs
- autovalidator.cs
- ImageBrush.cs
- Regex.cs
- NamedElement.cs
- OneWayElement.cs
- IDispatchConstantAttribute.cs
- StringExpressionSet.cs
- EventDescriptorCollection.cs
- DataListDesigner.cs
- MultipartIdentifier.cs
- OSFeature.cs
- CatalogPartCollection.cs
- ServiceProviders.cs
- AutoGeneratedFieldProperties.cs
- MarkupExtensionParser.cs
- RoleService.cs
- PlanCompiler.cs
- CodeCompileUnit.cs
- SingleAnimationUsingKeyFrames.cs
- GenericIdentity.cs
- WebPartConnectionsCloseVerb.cs
- AnnotationAdorner.cs
- XmlElementCollection.cs
- DecoderBestFitFallback.cs
- SqlBuffer.cs
- RepeaterCommandEventArgs.cs
- NameSpaceExtractor.cs
- RegexFCD.cs
- SmtpClient.cs
- ResourceReader.cs
- Vector3D.cs
- Point3DAnimation.cs
- QuadraticBezierSegment.cs
- ActivityExecutionContextCollection.cs
- ConnectionInterfaceCollection.cs
- SendKeys.cs
- SqlLiftIndependentRowExpressions.cs
- EnumerableWrapperWeakToStrong.cs
- VoiceChangeEventArgs.cs
- EntityDataSourceSelectingEventArgs.cs
- TableLayoutStyle.cs
- SettingsProviderCollection.cs
- SystemInfo.cs
- BrowserDefinition.cs
- ExcCanonicalXml.cs
- BatchServiceHost.cs
- Dump.cs
- IndexerNameAttribute.cs
- VisualTarget.cs
- DeviceContext2.cs
- XmlSortKey.cs
- WindowsNonControl.cs
- ToolBar.cs
- SqlFileStream.cs
- PageCache.cs
- AnnotationHelper.cs
- _MultipleConnectAsync.cs
- PropertyInformationCollection.cs