Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / WhitespaceReader.cs / 1305376 / WhitespaceReader.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mail { using System; using System.Text; using System.Net.Mime; using System.Globalization; using System.Collections; using System.Diagnostics; // FWS, CFWS, and Comments are defined in RFC 2822 section 3.2.3. // // FWS is a Folding White Space, or a series of spaces and tabs that may also contain a CRLF. // // CFWS is a FWS that also allows for nested comments enclosed in parenthesis. (comment (nested)) // // Valid values for these are declared in MailBnfHelper.cs and are explained in MailBNF.cs. // internal static class WhitespaceReader { // // This skips all folding and whitespace characters // // Preconditions: // - The data string must not be null or empty. // - The index must be within the upper bounds of the data string. // // Return value: // - The index of the next character that is NOT a whitespace character. // - -1 if the beginning of the data string is reached. // // A FormatException will be thrown if a CR or LF is found NOT in the sequence CRLF. internal static int ReadFwsReverse(string data, int index) { Debug.Assert(!String.IsNullOrEmpty(data), "data was null or empty"); Debug.Assert(index < data.Length, "index was outside the bounds of the string"); bool expectCR = false; for ( ; index >= 0; index--) { // Check for a valid CRLF pair if (data[index] == MailBnfHelper.CR && expectCR) { expectCR = false; // valid pair } // LF without CR, or CR without LF, invalid else if (data[index] == MailBnfHelper.CR || expectCR) { throw new FormatException(SR.GetString(SR.MailAddressInvalidFormat)); } // LF is only valid if preceded by a CR. // Skip both if they're found together. else if (data[index] == MailBnfHelper.LF) { expectCR = true; } // Skip whitespace else if (data[index] == MailBnfHelper.Space || data[index] == MailBnfHelper.Tab) { // No-op } else { // Neither check hit so we must be on something that is not whitespace break; } } if (expectCR) { // We found a LF without an immediately preceding CR, invalid. throw new FormatException(SR.GetString(SR.MailAddressInvalidFormat)); } return index; } // This method functions similarly to ReadFwsReverse but will also skip any comments. // // Comments are text within '(' and ')' and may be nested. There may also be consecutive comments. Unicode is // allowed, as the comments are not transmitted. // // This method was explicitly written in a non-recursive fashion to avoid malicious or accidental // stack-overflows from user input. // // Preconditions: // - The data string must not be null or empty // - The index must be within the upper bounds of the data string. // // Return value: // - The given index if it data[index] was not a ')' or white space // - The index of the next non comment or white space character // e.g. " d ( ( c o mment) )" returns index 1 // - -1 if skipping the comments and/or whitespace moves you to the beginning of the data string. // e.g. " (comment) " returns -1 // // Throws a FormatException for mismatched '(' and ')', or for unescaped characters not allowed in comments. internal static int ReadCfwsReverse(string data, int index) { Debug.Assert(!String.IsNullOrEmpty(data), "data was null or empty"); Debug.Assert(index < data.Length, "index was outside the bounds of the string"); int commentDepth = 0; // Check for valid whitespace index = ReadFwsReverse(data, index); while (index >= 0) { // Check for escaped characters. They must be within comments. int quotedCharCount = QuotedPairReader.CountQuotedChars(data, index, true); if (commentDepth > 0 && quotedCharCount > 0) { index = index - quotedCharCount; } // Start a new comment else if (data[index] == MailBnfHelper.EndComment) { commentDepth++; index--; } // Finish a comment else if (data[index] == MailBnfHelper.StartComment) { commentDepth--; if (commentDepth < 0) { // Mismatched '(' throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, MailBnfHelper.StartComment)); } index--; } // Check for valid characters within comments. Allow Unicode, as we won't transmit any comments. else if (commentDepth > 0 && (data[index] > MailBnfHelper.Ascii7bitMaxValue || MailBnfHelper.Ctext[data[index]])) { index--; } // If we're still in a comment, this must be an invalid char else if (commentDepth > 0) { throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, data[index])); } // We must no longer be in a comment, and this is not a whitespace char, return else { break; } // Check for valid whitespace index = ReadFwsReverse(data, index); } if (commentDepth > 0) { // Mismatched ')', throw throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, MailBnfHelper.EndComment)); } return index; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mail { using System; using System.Text; using System.Net.Mime; using System.Globalization; using System.Collections; using System.Diagnostics; // FWS, CFWS, and Comments are defined in RFC 2822 section 3.2.3. // // FWS is a Folding White Space, or a series of spaces and tabs that may also contain a CRLF. // // CFWS is a FWS that also allows for nested comments enclosed in parenthesis. (comment (nested)) // // Valid values for these are declared in MailBnfHelper.cs and are explained in MailBNF.cs. // internal static class WhitespaceReader { // // This skips all folding and whitespace characters // // Preconditions: // - The data string must not be null or empty. // - The index must be within the upper bounds of the data string. // // Return value: // - The index of the next character that is NOT a whitespace character. // - -1 if the beginning of the data string is reached. // // A FormatException will be thrown if a CR or LF is found NOT in the sequence CRLF. internal static int ReadFwsReverse(string data, int index) { Debug.Assert(!String.IsNullOrEmpty(data), "data was null or empty"); Debug.Assert(index < data.Length, "index was outside the bounds of the string"); bool expectCR = false; for ( ; index >= 0; index--) { // Check for a valid CRLF pair if (data[index] == MailBnfHelper.CR && expectCR) { expectCR = false; // valid pair } // LF without CR, or CR without LF, invalid else if (data[index] == MailBnfHelper.CR || expectCR) { throw new FormatException(SR.GetString(SR.MailAddressInvalidFormat)); } // LF is only valid if preceded by a CR. // Skip both if they're found together. else if (data[index] == MailBnfHelper.LF) { expectCR = true; } // Skip whitespace else if (data[index] == MailBnfHelper.Space || data[index] == MailBnfHelper.Tab) { // No-op } else { // Neither check hit so we must be on something that is not whitespace break; } } if (expectCR) { // We found a LF without an immediately preceding CR, invalid. throw new FormatException(SR.GetString(SR.MailAddressInvalidFormat)); } return index; } // This method functions similarly to ReadFwsReverse but will also skip any comments. // // Comments are text within '(' and ')' and may be nested. There may also be consecutive comments. Unicode is // allowed, as the comments are not transmitted. // // This method was explicitly written in a non-recursive fashion to avoid malicious or accidental // stack-overflows from user input. // // Preconditions: // - The data string must not be null or empty // - The index must be within the upper bounds of the data string. // // Return value: // - The given index if it data[index] was not a ')' or white space // - The index of the next non comment or white space character // e.g. " d ( ( c o mment) )" returns index 1 // - -1 if skipping the comments and/or whitespace moves you to the beginning of the data string. // e.g. " (comment) " returns -1 // // Throws a FormatException for mismatched '(' and ')', or for unescaped characters not allowed in comments. internal static int ReadCfwsReverse(string data, int index) { Debug.Assert(!String.IsNullOrEmpty(data), "data was null or empty"); Debug.Assert(index < data.Length, "index was outside the bounds of the string"); int commentDepth = 0; // Check for valid whitespace index = ReadFwsReverse(data, index); while (index >= 0) { // Check for escaped characters. They must be within comments. int quotedCharCount = QuotedPairReader.CountQuotedChars(data, index, true); if (commentDepth > 0 && quotedCharCount > 0) { index = index - quotedCharCount; } // Start a new comment else if (data[index] == MailBnfHelper.EndComment) { commentDepth++; index--; } // Finish a comment else if (data[index] == MailBnfHelper.StartComment) { commentDepth--; if (commentDepth < 0) { // Mismatched '(' throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, MailBnfHelper.StartComment)); } index--; } // Check for valid characters within comments. Allow Unicode, as we won't transmit any comments. else if (commentDepth > 0 && (data[index] > MailBnfHelper.Ascii7bitMaxValue || MailBnfHelper.Ctext[data[index]])) { index--; } // If we're still in a comment, this must be an invalid char else if (commentDepth > 0) { throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, data[index])); } // We must no longer be in a comment, and this is not a whitespace char, return else { break; } // Check for valid whitespace index = ReadFwsReverse(data, index); } if (commentDepth > 0) { // Mismatched ')', throw throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, MailBnfHelper.EndComment)); } return index; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ContentOnlyMessage.cs
- XmlTypeMapping.cs
- Win32KeyboardDevice.cs
- HwndSourceParameters.cs
- RadioButton.cs
- TextEditorTables.cs
- XPathDocumentBuilder.cs
- SqlException.cs
- CursorConverter.cs
- DataControlFieldCell.cs
- ColorConvertedBitmapExtension.cs
- RegexCharClass.cs
- TypePropertyEditor.cs
- SQLStringStorage.cs
- ExpressionLexer.cs
- StrokeNodeOperations2.cs
- XmlComplianceUtil.cs
- DSASignatureFormatter.cs
- FieldMetadata.cs
- DefaultExpression.cs
- TextTreeRootTextBlock.cs
- AppDomainFactory.cs
- WebFormsRootDesigner.cs
- RowToFieldTransformer.cs
- followingquery.cs
- SliderAutomationPeer.cs
- DataGridViewRowsAddedEventArgs.cs
- EntityPropertyMappingAttribute.cs
- CodeGenerator.cs
- EnumValAlphaComparer.cs
- Int16AnimationUsingKeyFrames.cs
- SourceInterpreter.cs
- WriteableBitmap.cs
- SuppressMergeCheckAttribute.cs
- RuleInfoComparer.cs
- ExtensionSurface.cs
- IOException.cs
- GridView.cs
- PrivilegedConfigurationManager.cs
- XPathItem.cs
- IISUnsafeMethods.cs
- CodeMemberMethod.cs
- GridViewHeaderRowPresenterAutomationPeer.cs
- ToolboxItemLoader.cs
- VirtualizedCellInfoCollection.cs
- Utils.cs
- WriteableBitmap.cs
- BaseParagraph.cs
- SchemaType.cs
- UserPersonalizationStateInfo.cs
- GZipDecoder.cs
- DbDataReader.cs
- BitmapDecoder.cs
- CssTextWriter.cs
- DebugHandleTracker.cs
- BinaryParser.cs
- _AutoWebProxyScriptHelper.cs
- MenuCommandsChangedEventArgs.cs
- ListItemCollection.cs
- TextRange.cs
- FormsAuthenticationConfiguration.cs
- shaperfactory.cs
- CodeTypeConstructor.cs
- DiffuseMaterial.cs
- Int32RectConverter.cs
- DesignColumnCollection.cs
- ResourceSet.cs
- SchemaNamespaceManager.cs
- Crc32.cs
- FixedDocumentSequencePaginator.cs
- SingleAnimationBase.cs
- ExceptionRoutedEventArgs.cs
- PixelFormatConverter.cs
- TypedElement.cs
- RegisteredScript.cs
- SecurityException.cs
- ParameterExpression.cs
- CalloutQueueItem.cs
- NavigationFailedEventArgs.cs
- SqlNode.cs
- GorillaCodec.cs
- TileBrush.cs
- SmuggledIUnknown.cs
- BreakRecordTable.cs
- AppearanceEditorPart.cs
- ModelItemExtensions.cs
- InputLanguage.cs
- DataSourceProvider.cs
- TypeListConverter.cs
- LogicalCallContext.cs
- RecognizerStateChangedEventArgs.cs
- SkinIDTypeConverter.cs
- MimeMapping.cs
- PenThread.cs
- tooltip.cs
- ConstructorNeedsTagAttribute.cs
- FlowDocumentPaginator.cs
- DateTimeHelper.cs
- Delegate.cs
- SQLGuid.cs