Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Text / EUCJPEncoding.cs / 1 / EUCJPEncoding.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Text { using System.Text; using System.Globalization; // EUCJPEncoding // // EUC-JP Encoding (51932) // // EUC-JP has the following code points: // 00-7F - ASCII // 80-8D & 90-9F - Control. (Like Unicode, except for 8e and 8f) // A1-FE, A1-FE - 2 byte JIS X 0208 range. // 8E, A1-DF - 2 byte half-width Katakana // 8F, A1-FE, A1-FE - 3 byte JIX X 0212 range. WE DON'T USE JIS 0212!!! // // New thoughts: // Fixing windows 20932 code page so that all characters can be looked up there. // // Old thoughts: // Windows NLS uses a special CP20932 for EUC-JP, but it is not used by mlang. Windows // Maps the 3 byte ranges to the 2 byte CP20932 by masking the 2nd byte with & 0x7F. // MLang uses the native windows 932 code page, which is more reliable, however the code points // don't line up as nicely as the 20932 code page, however it doesn't have JIS X 0212 support. // // So what we do is: // 1. For ASCII, leave it alone // 2. For half-width Katakana, use the leading byte and convert with 20936 code page. // 3. For JIS X 0208, Use the leading & trailing bytes with 20936 code page // 4. For JIS X 0212, Remove the lead byte, & 0xFF7F, and use the CP20936 table to convert. // // Regarding Normalization: // Forms KC & KD are precluded because of things like halfwidth Katakana that has compatibility mappings // Form D is precluded because of 0x00a8, which changes to space + dierises. // // I think that IsAlwaysNormalized should probably return true for form C (but not certain) // // NOTE: We don't use JIS 0212 so we are basically a DBCS code page, we just have to modify // the 932 table we're basing this on. // using System; [Serializable()] internal class EUCJPEncoding : DBCSCodePageEncoding { // This pretends to be CP 932 as far as memory tables are concerned. public EUCJPEncoding() : base(51932, 932) { this.m_bUseMlangTypeForSerialization = true; } protected unsafe override String GetMemorySectionName() { int iUseCodePage = this.bFlagDataTable ? dataTableCodePage : CodePage; String strName = String.Format(CultureInfo.InvariantCulture, "CodePage_{0}_{1}_{2}_{3}_{4}_EUCJP", iUseCodePage, this.pCodePage->VersionMajor, this.pCodePage->VersionMinor, this.pCodePage->VersionRevision, this.pCodePage->VersionBuild); return strName; } // Clean up characters for EUC-JP code pages, etc. protected override bool CleanUpBytes(ref int bytes) { if (bytes >= 0x100) { // map extended char (0xfa40-0xfc4b) to a special range // (ported from mlang) if (bytes >= 0xfa40 && bytes <= 0xfc4b) { if ( bytes >= 0xfa40 && bytes <= 0xfa5b ) { if ( bytes <= 0xfa49 ) bytes = bytes - 0x0b51 ; else if ( bytes >= 0xfa4a && bytes <= 0xfa53 ) bytes = bytes - 0x072f6 ; else if ( bytes >= 0xfa54 && bytes <= 0xfa57 ) bytes = bytes - 0x0b5b ; else if ( bytes == 0xfa58 ) bytes = 0x878a ; else if ( bytes == 0xfa59 ) bytes = 0x8782 ; else if ( bytes == 0xfa5a ) bytes = 0x8784 ; else if ( bytes == 0xfa5b ) bytes = 0x879a ; } else if ( bytes >= 0xfa5c && bytes <= 0xfc4b ) { byte tc = unchecked((byte)bytes); if ( tc < 0x5c ) bytes = bytes - 0x0d5f; else if ( tc >= 0x80 && tc <= 0x9B ) bytes = bytes - 0x0d1d; else bytes = bytes - 0x0d1c; } } // Convert 932 code page to 20932 like code page range // (also ported from mlang) byte bLead = unchecked((byte)(bytes >> 8)); byte bTrail = unchecked((byte)bytes); bLead -= ((bLead > (byte)0x9f) ? (byte)0xb1 : (byte)0x71); bLead = (byte)((bLead << 1) + 1); if (bTrail > (byte)0x9e) { bTrail -= (byte)0x7e; bLead++; } else { if (bTrail > (byte)0x7e) bTrail--; bTrail -= (byte)0x1f; } bytes = ((int)bLead) << 8 | (int)bTrail | 0x8080; // // Don't step on our katakana special hack plane, if katakana space return false. // if (bytes >= 0x8E00 && bytes <= 0x8EFF) // return false; // Don't step out of our allocated lead byte area. // All DBCS lead and trail bytes should be >= 0xa1 and <= 0xfe if ((bytes & 0xFF00) < 0xa100 || (bytes & 0xFF00) > 0xfe00 || (bytes & 0xFF) < 0xa1 || (bytes & 0xFF) > 0xfe) return false; // WARNING: Our funky mapping allows illegal values, which we continue to use // so that we're compatible with Everett. } else { // For 51932 1/2 Katakana gets a 0x8E lead byte // Adjust 1/2 Katakana if (bytes >= 0xa1 && bytes <= 0xdf) { bytes |= 0x8E00; return true; } // 0x81-0x9f and 0xe0-0xfc CP 932 // 0x8e and 0xa1-0xfe CP 20932 (we don't use 8e though) // b0-df is 1/2 Katakana // So 81-9f & e0-fc are 932 lead bytes, a1-fe are our lead bytes // so ignore everything above 0x80 except 0xa0 and 0xff if (bytes >= 0x81 && bytes != 0xa0 && bytes != 0xff) { // We set diffent lead bytes later, so just return false return false; } } return true; } protected override unsafe void CleanUpEndBytes(char* chars) { // Need to special case CP 51932 // 0x81-0x9f and 0xe0-0xfc CP 932 // 0x8e and 0xa1-0xfe CP 20932 // 0x10 and 0x21-0x9? Us (remapping 932) // b0-df is 1/2 Katakana (trail byte) // A1-FE are DBCS code points for (int i = 0xA1; i <= 0xFE; i++) chars[i] = LEAD_BYTE_CHAR; // And 8E is lead byte for Katakana (already set) chars[0x8e] = LEAD_BYTE_CHAR; } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- FunctionUpdateCommand.cs
- StyleXamlTreeBuilder.cs
- ObjectHandle.cs
- SyndicationElementExtensionCollection.cs
- ExceptionRoutedEventArgs.cs
- EnumUnknown.cs
- DoWorkEventArgs.cs
- DesignSurfaceCollection.cs
- ExpandSegmentCollection.cs
- EndEvent.cs
- BaseCollection.cs
- WriterOutput.cs
- ScrollItemPatternIdentifiers.cs
- GraphicsState.cs
- PrivateUnsafeNativeCompoundFileMethods.cs
- UnrecognizedAssertionsBindingElement.cs
- FixedPageProcessor.cs
- Pen.cs
- StorageEntitySetMapping.cs
- AbstractDataSvcMapFileLoader.cs
- GeneralTransform3DGroup.cs
- EdmProperty.cs
- PropertyMappingExceptionEventArgs.cs
- DataSourceXmlSubItemAttribute.cs
- fixedPageContentExtractor.cs
- entitydatasourceentitysetnameconverter.cs
- CustomAssemblyResolver.cs
- StartUpEventArgs.cs
- InheritanceContextChangedEventManager.cs
- DetailsViewActionList.cs
- StrokeSerializer.cs
- QuotedPrintableStream.cs
- ChangePassword.cs
- WorkItem.cs
- DeferredRunTextReference.cs
- IconHelper.cs
- CTreeGenerator.cs
- CompatibleComparer.cs
- ListBox.cs
- WaitForChangedResult.cs
- HttpHandlersInstallComponent.cs
- LockRenewalTask.cs
- DataComponentMethodGenerator.cs
- DeobfuscatingStream.cs
- ThaiBuddhistCalendar.cs
- ContractReference.cs
- WindowsImpersonationContext.cs
- BamlStream.cs
- ObjectDataSourceChooseTypePanel.cs
- BufferedOutputStream.cs
- TraceSection.cs
- SortDescriptionCollection.cs
- IndexedString.cs
- StylusPlugin.cs
- MarshalDirectiveException.cs
- PageCatalogPart.cs
- Section.cs
- XmlDownloadManager.cs
- HtmlControlPersistable.cs
- ParallelQuery.cs
- ClientConvert.cs
- WebCategoryAttribute.cs
- NumericPagerField.cs
- LogReserveAndAppendState.cs
- Predicate.cs
- Focus.cs
- BuildProviderCollection.cs
- SizeConverter.cs
- WindowsToolbarItemAsMenuItem.cs
- MessageDecoder.cs
- InvalidCommandTreeException.cs
- _TLSstream.cs
- CookielessHelper.cs
- SecurityUtils.cs
- MobileUITypeEditor.cs
- HttpConfigurationContext.cs
- TimeoutException.cs
- BitmapImage.cs
- PathSegmentCollection.cs
- TcpStreams.cs
- MessageDecoder.cs
- TextDecorationCollectionConverter.cs
- DesignConnection.cs
- TabPanel.cs
- GZipDecoder.cs
- CodeCompileUnit.cs
- XmlKeywords.cs
- StyleCollection.cs
- ScriptingJsonSerializationSection.cs
- CornerRadiusConverter.cs
- BitmapEffectCollection.cs
- CharAnimationUsingKeyFrames.cs
- Encoding.cs
- DbConvert.cs
- DBCommandBuilder.cs
- EntityCodeGenerator.cs
- GcHandle.cs
- ScrollItemPattern.cs
- SelfSignedCertificate.cs
- BidOverLoads.cs