Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / _IPv4Address.cs / 1305376 / _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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ExpressionEditorAttribute.cs
- IPAddressCollection.cs
- AuthenticationModulesSection.cs
- RightsManagementUser.cs
- PreparingEnlistment.cs
- ChangeTracker.cs
- ConfigurationUtility.cs
- ChangePassword.cs
- XmlHelper.cs
- ActivityPreviewDesigner.cs
- XmlCharType.cs
- StringAnimationUsingKeyFrames.cs
- HostedHttpTransportManager.cs
- AddInControllerImpl.cs
- TypeUtils.cs
- FileNotFoundException.cs
- SkipStoryboardToFill.cs
- MappedMetaModel.cs
- ColorConverter.cs
- PLINQETWProvider.cs
- ArrayWithOffset.cs
- SapiInterop.cs
- util.cs
- ListViewAutomationPeer.cs
- BitSet.cs
- CookieParameter.cs
- QilChoice.cs
- ColumnClickEvent.cs
- BrowserTree.cs
- PenContexts.cs
- DesignerLinkAdapter.cs
- NavigationWindow.cs
- XmlDomTextWriter.cs
- GenericUriParser.cs
- _NativeSSPI.cs
- SimpleHandlerBuildProvider.cs
- BuildProvidersCompiler.cs
- BindingBase.cs
- Typeface.cs
- GetLedgerEntryForRecipientRequest.cs
- TimeSpan.cs
- MultiTrigger.cs
- ModelTreeEnumerator.cs
- DynamicResourceExtension.cs
- SafeProcessHandle.cs
- xmlformatgeneratorstatics.cs
- XPathScanner.cs
- WindowsGraphicsWrapper.cs
- ProfilePropertySettingsCollection.cs
- SoapReflectionImporter.cs
- Internal.cs
- ParameterCollection.cs
- OdbcEnvironmentHandle.cs
- AuthStoreRoleProvider.cs
- ThreadExceptionEvent.cs
- CharacterHit.cs
- RegexCode.cs
- URLString.cs
- PasswordBox.cs
- CompilerParameters.cs
- ZoomPercentageConverter.cs
- BaseDataBoundControlDesigner.cs
- StorageComplexPropertyMapping.cs
- TableRow.cs
- DataGridViewCellValueEventArgs.cs
- PolyLineSegment.cs
- CommandLibraryHelper.cs
- ConfigXmlDocument.cs
- Cloud.cs
- SafeTimerHandle.cs
- GroupBox.cs
- UTF8Encoding.cs
- InputBinding.cs
- RegistrySecurity.cs
- Button.cs
- ActiveXHost.cs
- FileDataSourceCache.cs
- XmlILIndex.cs
- Vector.cs
- COM2PropertyPageUITypeConverter.cs
- ExpressionStringBuilder.cs
- EnumerableRowCollection.cs
- ColumnPropertiesGroup.cs
- Utils.cs
- QilLiteral.cs
- DynamicResourceExtension.cs
- ComEventsMethod.cs
- RootProfilePropertySettingsCollection.cs
- XPathNodePointer.cs
- ChunkedMemoryStream.cs
- CommunicationException.cs
- MergeEnumerator.cs
- SoapHeaders.cs
- EntityDataSourceDataSelection.cs
- ProcessHostMapPath.cs
- AuthStoreRoleProvider.cs
- LocalBuilder.cs
- SharedUtils.cs
- ContentPresenter.cs
- ComNativeDescriptor.cs