Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / 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
- UnknownBitmapEncoder.cs
- AnnotationResourceChangedEventArgs.cs
- SpellerStatusTable.cs
- XXXOnTypeBuilderInstantiation.cs
- XmlNode.cs
- EventHandlersStore.cs
- CircleHotSpot.cs
- SingleSelectRootGridEntry.cs
- XslCompiledTransform.cs
- ListViewUpdateEventArgs.cs
- BindToObject.cs
- SQLString.cs
- ServiceMetadataExtension.cs
- SiteMapDataSourceView.cs
- SQLResource.cs
- ProxyHelper.cs
- GridSplitterAutomationPeer.cs
- OverrideMode.cs
- Point.cs
- _TransmitFileOverlappedAsyncResult.cs
- ProxyWebPartManager.cs
- VoiceSynthesis.cs
- GradientSpreadMethodValidation.cs
- UnsafeMethods.cs
- InstanceHandleReference.cs
- SequenceFullException.cs
- MeshGeometry3D.cs
- HttpDateParse.cs
- IsolatedStorageFilePermission.cs
- CultureSpecificStringDictionary.cs
- DependencyPropertyKind.cs
- ByteStorage.cs
- SystemParameters.cs
- FocusTracker.cs
- TracedNativeMethods.cs
- BeginSelectCardRequest.cs
- SudsWriter.cs
- SoapObjectWriter.cs
- NotEqual.cs
- CommandDevice.cs
- IODescriptionAttribute.cs
- WebBodyFormatMessageProperty.cs
- DbConnectionOptions.cs
- RemoteWebConfigurationHostStream.cs
- UInt32.cs
- HttpCacheParams.cs
- HealthMonitoringSectionHelper.cs
- TextTreeDeleteContentUndoUnit.cs
- WindowShowOrOpenTracker.cs
- Process.cs
- XmlWrappingReader.cs
- RemotingConfigParser.cs
- Odbc32.cs
- WebPart.cs
- ColorAnimationUsingKeyFrames.cs
- ColumnBinding.cs
- TaskFileService.cs
- LinqDataSourceEditData.cs
- arabicshape.cs
- ButtonFlatAdapter.cs
- DefaultTextStoreTextComposition.cs
- ReadOnlyAttribute.cs
- WindowsFormsHelpers.cs
- SafeReversePInvokeHandle.cs
- ComponentDispatcher.cs
- prefixendpointaddressmessagefilter.cs
- HandleInitializationContext.cs
- MethodToken.cs
- StaticExtensionConverter.cs
- DateTimeStorage.cs
- PropertyKey.cs
- DefaultValueConverter.cs
- Label.cs
- Timer.cs
- SerializationEventsCache.cs
- ConnectionProviderAttribute.cs
- ItemCollection.cs
- SerializationInfoEnumerator.cs
- TiffBitmapEncoder.cs
- UriParserTemplates.cs
- MessageLogTraceRecord.cs
- WebBrowserNavigatingEventHandler.cs
- PartManifestEntry.cs
- Size.cs
- Viewport3DAutomationPeer.cs
- SystemColors.cs
- DesignTimeTemplateParser.cs
- activationcontext.cs
- SafeNativeMethods.cs
- BamlLocalizer.cs
- WebPartConnectionsCancelEventArgs.cs
- GeometryDrawing.cs
- MimeWriter.cs
- HttpCapabilitiesEvaluator.cs
- UrlEncodedParameterWriter.cs
- CompilerWrapper.cs
- XPathException.cs
- AVElementHelper.cs
- IncrementalCompileAnalyzer.cs
- PassportIdentity.cs