Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Net / System / _IPv4Address.cs / 1 / _IPv4Address.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System { // The class designed as to keep minimal the working set of Uri class. // The idea is to stay with static helper methods and strings internal class IPv4AddressHelper { // fields private IPv4AddressHelper() { } private const int NumberOfLabels = 4; // methods internal static string ParseCanonicalName(string str, int start, int end, ref bool isLoopback) { unsafe { byte* numbers = stackalloc byte[NumberOfLabels]; isLoopback = Parse(str, numbers, start, end); return numbers[0] + "." + numbers[1] + "." + numbers[2] + "." + numbers[3]; } } internal static int ParseHostNumber(string str, int start, int end) { unsafe { byte* numbers = stackalloc byte[NumberOfLabels]; Parse(str, numbers, start, end); return (numbers[0] << 24) + (numbers[1] << 16) + (numbers[2] << 8) + numbers[3]; } } // // IsValid // // Performs IsValid on a substring. Updates the index to where we // believe the IPv4 address ends // // Inputs: //name // string containing possible IPv4 address // // start // offset in to start checking for IPv4 address // // end // offset in of the last character we can touch in the check // // Outputs: // end // index of last character in we checked // // Assumes: // The address string is terminated by either // end of the string, characters ':' '/' '\' '?' // // // Returns: // bool // // Throws: // Nothing // //internal unsafe static bool IsValid(char* name, int start, ref int end) { // return IsValid(name, start, ref end, false); //} //Remark: MUST NOT be used unless all input indexes are are verified and trusted. internal unsafe static bool IsValid(char* name, int start, ref int end, bool allowIPv6, bool notImplicitFile) { int dots = 0; int number = 0; bool haveNumber = false; while (start < end) { char ch = name[start]; if (allowIPv6) { // for ipv4 inside ipv6 the terminator is either ScopeId, prefix or ipv6 terminator if(ch == ']' || ch == '/' || ch == '%') break; } else if (ch == '/' || ch == '\\' || (notImplicitFile && (ch == ':' || ch == '?' || ch == '#'))) { break; } if (ch <= '9' && ch >= '0') { haveNumber = true; number = number * 10 + (name[start] - '0'); if (number > 255) { return false; } } else if (ch == '.') { if (!haveNumber) { return false; } ++dots; haveNumber = false; number = 0; } else { return false; } ++start; } bool res = (dots == 3) && haveNumber; if (res) { end = start; } return res; } // // Parse // // Convert this IPv4 address into a sequence of 4 8-bit numbers // // Assumes: // has been validated and contains only decimal digits in groups // of 8-bit numbers and the characters '.' // Address may terminate with ':' or with the end of the string // unsafe private static bool Parse(string name, byte* numbers, int start, int end) { for (int i = 0; i < NumberOfLabels; ++i) { byte b = 0; char ch; for (; (start < end) && (ch = name[start]) != '.' && ch != ':'; ++start) { b = (byte)(b * 10 + (byte)(ch - '0')); } numbers[i] = b; ++start; } return numbers[0] == 127; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System { // The class designed as to keep minimal the working set of Uri class. // The idea is to stay with static helper methods and strings internal class IPv4AddressHelper { // fields private IPv4AddressHelper() { } private const int NumberOfLabels = 4; // methods internal static string ParseCanonicalName(string str, int start, int end, ref bool isLoopback) { unsafe { byte* numbers = stackalloc byte[NumberOfLabels]; isLoopback = Parse(str, numbers, start, end); return numbers[0] + "." + numbers[1] + "." + numbers[2] + "." + numbers[3]; } } internal static int ParseHostNumber(string str, int start, int end) { unsafe { byte* numbers = stackalloc byte[NumberOfLabels]; Parse(str, numbers, start, end); return (numbers[0] << 24) + (numbers[1] << 16) + (numbers[2] << 8) + numbers[3]; } } // // IsValid // // Performs IsValid on a substring. Updates the index to where we // believe the IPv4 address ends // // Inputs: //name // string containing possible IPv4 address // // start // offset in to start checking for IPv4 address // // end // offset in of the last character we can touch in the check // // Outputs: // end // index of last character in we checked // // Assumes: // The address string is terminated by either // end of the string, characters ':' '/' '\' '?' // // // Returns: // bool // // Throws: // Nothing // //internal unsafe static bool IsValid(char* name, int start, ref int end) { // return IsValid(name, start, ref end, false); //} //Remark: MUST NOT be used unless all input indexes are are verified and trusted. internal unsafe static bool IsValid(char* name, int start, ref int end, bool allowIPv6, bool notImplicitFile) { int dots = 0; int number = 0; bool haveNumber = false; while (start < end) { char ch = name[start]; if (allowIPv6) { // for ipv4 inside ipv6 the terminator is either ScopeId, prefix or ipv6 terminator if(ch == ']' || ch == '/' || ch == '%') break; } else if (ch == '/' || ch == '\\' || (notImplicitFile && (ch == ':' || ch == '?' || ch == '#'))) { break; } if (ch <= '9' && ch >= '0') { haveNumber = true; number = number * 10 + (name[start] - '0'); if (number > 255) { return false; } } else if (ch == '.') { if (!haveNumber) { return false; } ++dots; haveNumber = false; number = 0; } else { return false; } ++start; } bool res = (dots == 3) && haveNumber; if (res) { end = start; } return res; } // // Parse // // Convert this IPv4 address into a sequence of 4 8-bit numbers // // Assumes: // has been validated and contains only decimal digits in groups // of 8-bit numbers and the characters '.' // Address may terminate with ':' or with the end of the string // unsafe private static bool Parse(string name, byte* numbers, int start, int end) { for (int i = 0; i < NumberOfLabels; ++i) { byte b = 0; char ch; for (; (start < end) && (ch = name[start]) != '.' && ch != ':'; ++start) { b = (byte)(b * 10 + (byte)(ch - '0')); } numbers[i] = b; ++start; } return numbers[0] == 127; } } } // 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
- DataTrigger.cs
- SimpleTypesSurrogate.cs
- XmlObjectSerializerWriteContextComplex.cs
- DataGridCell.cs
- BevelBitmapEffect.cs
- CodeSnippetStatement.cs
- UIElementPropertyUndoUnit.cs
- EntityDataSourceSelectingEventArgs.cs
- HtmlProps.cs
- ApplicationHost.cs
- PolyBezierSegment.cs
- ControlPropertyNameConverter.cs
- WinFormsSecurity.cs
- SystemColorTracker.cs
- GridViewUpdateEventArgs.cs
- XNodeNavigator.cs
- ObjectManager.cs
- SemanticBasicElement.cs
- IisTraceListener.cs
- XmlAnyElementAttributes.cs
- ExpressionPrefixAttribute.cs
- SqlDependency.cs
- remotingproxy.cs
- DockPattern.cs
- SmtpNtlmAuthenticationModule.cs
- httpstaticobjectscollection.cs
- PeerTransportListenAddressValidator.cs
- BitmapImage.cs
- EnumConverter.cs
- AddingNewEventArgs.cs
- SpeakProgressEventArgs.cs
- CopyOfAction.cs
- IssuedSecurityTokenParameters.cs
- QueryAccessibilityHelpEvent.cs
- UniqueEventHelper.cs
- Event.cs
- AssemblyName.cs
- CasesDictionary.cs
- CodeExporter.cs
- XmlCDATASection.cs
- Errors.cs
- ActivityDesignerResources.cs
- UTF8Encoding.cs
- DocumentationServerProtocol.cs
- DbConnectionFactory.cs
- SerializationObjectManager.cs
- DataGridViewCellCancelEventArgs.cs
- SiteOfOriginContainer.cs
- CodeArrayCreateExpression.cs
- BuildDependencySet.cs
- Color.cs
- CodeObjectCreateExpression.cs
- SemanticValue.cs
- DataGridViewRowEventArgs.cs
- SystemResourceKey.cs
- VersionedStreamOwner.cs
- QuaternionAnimationUsingKeyFrames.cs
- SqlClientWrapperSmiStreamChars.cs
- DurableTimerExtension.cs
- TextDpi.cs
- AutomationElement.cs
- TextParentUndoUnit.cs
- Formatter.cs
- mda.cs
- ConfigUtil.cs
- ClassImporter.cs
- LinkedResource.cs
- NetWebProxyFinder.cs
- SoapSchemaExporter.cs
- _AuthenticationState.cs
- Classification.cs
- AutoResetEvent.cs
- Mutex.cs
- COM2TypeInfoProcessor.cs
- _ProxyRegBlob.cs
- ForEachDesigner.xaml.cs
- RequiredAttributeAttribute.cs
- Hex.cs
- UserControl.cs
- CompositeFontParser.cs
- BinaryMethodMessage.cs
- ContextMenu.cs
- CombinedGeometry.cs
- RoleServiceManager.cs
- JsonFormatReaderGenerator.cs
- CharEnumerator.cs
- BridgeDataRecord.cs
- VectorKeyFrameCollection.cs
- AutomationPropertyInfo.cs
- FileLevelControlBuilderAttribute.cs
- StringToken.cs
- TextDecorationCollection.cs
- UrlPath.cs
- ReaderContextStackData.cs
- StringInfo.cs
- HostingEnvironmentSection.cs
- TemplateBindingExtension.cs
- XsdDateTime.cs
- ContentValidator.cs
- ButtonColumn.cs