Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Text / EncoderReplacementFallback.cs / 1 / EncoderReplacementFallback.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // EncoderReplacementFallback.cs // namespace System.Text { using System; [Serializable] public sealed class EncoderReplacementFallback : EncoderFallback { // Our variables private String strDefault; // Construction. Default replacement fallback uses no best fit and ? replacement string public EncoderReplacementFallback() : this("?") { } public EncoderReplacementFallback(String replacement) { // Must not be null if (replacement == null) throw new ArgumentNullException("replacement"); // Make sure it doesn't have bad surrogate pairs bool bFoundHigh=false; for (int i = 0; i < replacement.Length; i++) { // Found a surrogate? if (Char.IsSurrogate(replacement,i)) { // High or Low? if (Char.IsHighSurrogate(replacement, i)) { // if already had a high one, stop if (bFoundHigh) break; // break & throw at the bFoundHIgh below bFoundHigh = true; } else { // Low, did we have a high? if (!bFoundHigh) { // Didn't have one, make if fail when we stop bFoundHigh = true; break; } // Clear flag bFoundHigh = false; } } // If last was high we're in trouble (not surrogate so not low surrogate, so break) else if (bFoundHigh) break; } if (bFoundHigh) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidCharSequenceNoIndex", "replacement")); strDefault = replacement; } public String DefaultString { get { return strDefault; } } public override EncoderFallbackBuffer CreateFallbackBuffer() { return new EncoderReplacementFallbackBuffer(this); } // Maximum number of characters that this instance of this fallback could return public override int MaxCharCount { get { return strDefault.Length; } } public override bool Equals(Object value) { EncoderReplacementFallback that = value as EncoderReplacementFallback; if (that != null) { return (this.strDefault == that.strDefault); } return (false); } public override int GetHashCode() { return strDefault.GetHashCode(); } } public sealed class EncoderReplacementFallbackBuffer : EncoderFallbackBuffer { // Store our default string private String strDefault; int fallbackCount = -1; int fallbackIndex = -1; // Construction public EncoderReplacementFallbackBuffer(EncoderReplacementFallback fallback) { // 2X in case we're a surrogate pair this.strDefault = fallback.DefaultString + fallback.DefaultString; } // Fallback Methods public override bool Fallback(char charUnknown, int index) { // If we had a buffer already we're being recursive, throw, it's probably at the suspect // character in our array. if (fallbackCount >= 1) { // If we're recursive we may still have something in our buffer that makes this a surrogate if (char.IsHighSurrogate(charUnknown) && fallbackCount >= 0 && char.IsLowSurrogate(strDefault[fallbackIndex+1])) ThrowLastCharRecursive(Char.ConvertToUtf32(charUnknown, strDefault[fallbackIndex+1])); // Nope, just one character ThrowLastCharRecursive(unchecked((int)charUnknown)); } // Go ahead and get our fallback // Divide by 2 because we aren't a surrogate pair fallbackCount = strDefault.Length/2; fallbackIndex = -1; return fallbackCount != 0; } public override bool Fallback(char charUnknownHigh, char charUnknownLow, int index) { // Double if (!Char.IsHighSurrogate(charUnknownHigh)) throw new ArgumentOutOfRangeException("charUnknownHigh", Environment.GetResourceString("ArgumentOutOfRange_Range", 0xD800, 0xDBFF)); if (!Char.IsLowSurrogate(charUnknownLow)) throw new ArgumentOutOfRangeException("CharUnknownLow", Environment.GetResourceString("ArgumentOutOfRange_Range", 0xDC00, 0xDFFF)); // If we had a buffer already we're being recursive, throw, it's probably at the suspect // character in our array. if (fallbackCount >= 1) ThrowLastCharRecursive(Char.ConvertToUtf32(charUnknownHigh, charUnknownLow)); // Go ahead and get our fallback fallbackCount = strDefault.Length; fallbackIndex = -1; return fallbackCount != 0; } public override char GetNextChar() { // We want it to get < 0 because == 0 means that the current/last character is a fallback // and we need to detect recursion. We could have a flag but we already have this counter. fallbackCount--; fallbackIndex++; // Do we have anything left? 0 is now last fallback char, negative is nothing left if (fallbackCount < 0) return (char)0; // Need to get it out of the buffer. BCLDebug.Assert(fallbackIndex < strDefault.Length && fallbackIndex >= 0, "Index exceeds buffer range"); return strDefault[fallbackIndex]; } public override bool MovePrevious() { // Back up one, only if we just processed the last character (or earlier) if (fallbackCount >= -1 && fallbackIndex >= 0) { fallbackIndex--; fallbackCount++; return true; } // Return false 'cause we couldn't do it. return false; } // How many characters left to output? public override int Remaining { get { // Our count is 0 for 1 character left. return (fallbackCount < 0) ? 0 : fallbackCount; } } // Clear the buffer public override unsafe void Reset() { fallbackCount = -1; fallbackIndex = 0; charStart = null; bFallingBack = false; } } } // 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
- AsyncDataRequest.cs
- PropertyEntry.cs
- ObjectPersistData.cs
- DesignerGeometryHelper.cs
- HashJoinQueryOperatorEnumerator.cs
- GroupQuery.cs
- ListenerConfig.cs
- Fault.cs
- MenuItemStyleCollection.cs
- Bidi.cs
- ToolStripControlHost.cs
- ResXResourceSet.cs
- PlaceHolder.cs
- CapabilitiesAssignment.cs
- DataGridViewRowPostPaintEventArgs.cs
- HelpKeywordAttribute.cs
- CollectionViewGroup.cs
- FileLogRecord.cs
- GeneralTransform.cs
- ToolboxComponentsCreatedEventArgs.cs
- ComponentDispatcher.cs
- ListDataBindEventArgs.cs
- OutOfMemoryException.cs
- DataService.cs
- MatrixTransform3D.cs
- Rights.cs
- DataServiceException.cs
- EditorPart.cs
- invalidudtexception.cs
- ImmutableCommunicationTimeouts.cs
- Ref.cs
- TransactionProxy.cs
- SatelliteContractVersionAttribute.cs
- TextServicesDisplayAttribute.cs
- DiscreteKeyFrames.cs
- UnicastIPAddressInformationCollection.cs
- HMAC.cs
- NonDualMessageSecurityOverHttpElement.cs
- AVElementHelper.cs
- SerializationEventsCache.cs
- InternalException.cs
- WebPermission.cs
- ActivityDesignerAccessibleObject.cs
- ToolStripDropTargetManager.cs
- ViewLoader.cs
- HtmlElementEventArgs.cs
- XpsImageSerializationService.cs
- XsltLibrary.cs
- ProgressiveCrcCalculatingStream.cs
- ObjectQuery.cs
- OrderPreservingPipeliningSpoolingTask.cs
- XmlNamedNodeMap.cs
- UpdatePanelControlTrigger.cs
- TableFieldsEditor.cs
- FileChangesMonitor.cs
- PersonalizationState.cs
- Trace.cs
- XPathParser.cs
- PageContentAsyncResult.cs
- MemberListBinding.cs
- ArrowControl.xaml.cs
- OdbcHandle.cs
- ZipIORawDataFileBlock.cs
- DataGridViewCellStyleChangedEventArgs.cs
- FixedSOMPageConstructor.cs
- LockedBorderGlyph.cs
- DataTableMappingCollection.cs
- FileFormatException.cs
- TypeSystem.cs
- ComponentEvent.cs
- Enum.cs
- PointAnimationUsingKeyFrames.cs
- DropDownList.cs
- cookie.cs
- AnimationClockResource.cs
- wpf-etw.cs
- SafeBuffer.cs
- FileLogRecord.cs
- BrowserDefinitionCollection.cs
- RSAOAEPKeyExchangeFormatter.cs
- DomainConstraint.cs
- SubpageParagraph.cs
- BinarySerializer.cs
- InvalidateEvent.cs
- ApplicationDirectoryMembershipCondition.cs
- PaintEvent.cs
- Util.cs
- EpmCustomContentSerializer.cs
- ButtonChrome.cs
- PathGeometry.cs
- ThreadInterruptedException.cs
- SqlFileStream.cs
- ZipIOEndOfCentralDirectoryBlock.cs
- DecoderFallbackWithFailureFlag.cs
- RequestSecurityToken.cs
- EndSelectCardRequest.cs
- PreservationFileReader.cs
- FormClosingEvent.cs
- ExpressionEvaluator.cs
- XmlSchemaAppInfo.cs