Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / CodePageUtils.cs / 1 / CodePageUtils.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { using System.Collections; // // Utility class to help with determining if a given code page // is ASCII compatible (preserves 0-127 Unicode characters as is) // internal static class CodePageUtils { /* The following array of ASCII compatible code pages is generated by running this code on a machine that has _many_ codepages installed: using System; using System.Collections; using System.Text; public class qq { public static void Main(string[] args) { ArrayList list = new ArrayList(); byte[] bb = new byte[128]; for (int i = 0; i < 128; i++) bb[i] = (byte)i; String asciiString = Encoding.ASCII.GetString(bb); for (int i = 1; i < 100000; i++) { try { Encoding e = Encoding.GetEncoding(i); byte[] xx = e.GetBytes(asciiString); if (xx.Length == 128) { bool good = true; for (int j = 0; j < 128; j++) { if (bb[j] != xx[j]) { good = false; break; } } if (good) list.Add(i); } } catch {} } int n = list.Count; Console.Write("private const int[] _asciiCompatCodePages = new int[" + n + "] {\r\n "); for (int i = 0; i < n; i++) { Console.Write("{0,5}", list[i]); if (i < n-1) Console.Write(", "); if (((i+1) % 10) == 0) Console.Write("\r\n "); } Console.Write("\r\n};\r\n"); } } */ private static int[] _asciiCompatCodePages = new int[79] { 437, 708, 720, 737, 775, 850, 852, 855, 857, 858, 860, 861, 862, 863, 864, 865, 866, 869, 874, 932, 936, 949, 950, 1250, 1251, 1252, 1253, 1254, 1255, 1256, 1257, 1258, 1361, 10000, 10001, 10002, 10003, 10004, 10005, 10006, 10007, 10008, 10010, 10017, 10029, 10079, 10081, 10082, 20000, 20001, 20002, 20003, 20004, 20005, 20127, 20866, 20932, 20936, 20949, 21866, 28591, 28592, 28593, 28594, 28595, 28596, 28597, 28598, 28599, 28605, 38598, 50220, 50221, 50222, 50225, 50227, 51932, 51949, 65001 }; internal /*public*/ static bool IsAsciiCompatibleCodePage(int codepage) { //alternatives to binary search considered //Hashtable: static initialization increases startup up, perf relative //Byte array would consume ~8K, but lookups constant //with 80 entries, binary search limited to 7 indexes into array int lo = 0; int hi = 78; while(lo <= hi) { int i = (lo + hi) >> 1; int c; c = _asciiCompatCodePages[i] - codepage; if (c == 0) return true; //i is the index of the item if (c < 0) { lo = i + 1; } else { hi = i - 1; } } return false; //lo is the index of the item immediately after //~lo returned in some implementations for false indicator with additional info } internal const int CodePageUT8 = 65001; } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CodeThrowExceptionStatement.cs
- HandlerBase.cs
- CommandConverter.cs
- StringFreezingAttribute.cs
- ParseHttpDate.cs
- basevalidator.cs
- MenuItemBinding.cs
- prefixendpointaddressmessagefilter.cs
- InterleavedZipPartStream.cs
- ButtonChrome.cs
- SystemNetHelpers.cs
- FlowchartDesigner.xaml.cs
- WeakReference.cs
- ArgumentOutOfRangeException.cs
- DesignDataSource.cs
- Quaternion.cs
- SplayTreeNode.cs
- TimeSpanOrInfiniteConverter.cs
- CompositeFontParser.cs
- Constant.cs
- StrongName.cs
- _CacheStreams.cs
- WindowsHyperlink.cs
- SocketAddress.cs
- ArraySet.cs
- RequestFactory.cs
- MobileControlPersister.cs
- JournalEntry.cs
- MenuBindingsEditor.cs
- ClipboardProcessor.cs
- Soap12ProtocolReflector.cs
- PrivateUnsafeNativeCompoundFileMethods.cs
- RegexRunnerFactory.cs
- StreamGeometryContext.cs
- FormViewPagerRow.cs
- SqlDataSourceSelectingEventArgs.cs
- FunctionOverloadResolver.cs
- WeakEventTable.cs
- SchemaMapping.cs
- FileDetails.cs
- SelectionPatternIdentifiers.cs
- Accessible.cs
- CodeNamespace.cs
- QueryCacheManager.cs
- GroupItem.cs
- XmlValidatingReaderImpl.cs
- DataObjectEventArgs.cs
- ProvidersHelper.cs
- QueryProcessor.cs
- PreviewPageInfo.cs
- TextRangeEditLists.cs
- RequiredFieldValidator.cs
- MenuTracker.cs
- SqlTopReducer.cs
- TargetConverter.cs
- FormatException.cs
- MailWebEventProvider.cs
- ParameterModifier.cs
- BitmapPalettes.cs
- TemplateBuilder.cs
- Style.cs
- URLMembershipCondition.cs
- EnumBuilder.cs
- DtdParser.cs
- XmlSchemaObject.cs
- ScriptingSectionGroup.cs
- SplitterDesigner.cs
- Durable.cs
- ProgressBar.cs
- MenuBindingsEditorForm.cs
- NegationPusher.cs
- ActivationService.cs
- TableLayoutPanelCellPosition.cs
- WebZone.cs
- SafeRightsManagementQueryHandle.cs
- ConditionCollection.cs
- ScriptingJsonSerializationSection.cs
- ContextMarshalException.cs
- ZoneLinkButton.cs
- TileBrush.cs
- CharacterMetricsDictionary.cs
- NavigationProgressEventArgs.cs
- ColorKeyFrameCollection.cs
- OdbcTransaction.cs
- Int64.cs
- Timer.cs
- XmlSchemaComplexContentExtension.cs
- ClientRolePrincipal.cs
- TextSelectionHelper.cs
- TrustSection.cs
- GCHandleCookieTable.cs
- ModuleConfigurationInfo.cs
- ProgressBarHighlightConverter.cs
- Enum.cs
- FontSource.cs
- EventProviderBase.cs
- ExpressionHelper.cs
- NegatedConstant.cs
- Overlapped.cs
- SQLInt64.cs