Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Base / MS / Internal / IO / Zip / ZipIOExtraFieldPaddingElement.cs / 1 / ZipIOExtraFieldPaddingElement.cs
//------------------------------------------------------------------------------ //------------- *** WARNING *** //------------- This file is part of a legally monitored development project. //------------- Do not check in changes to this project. Do not raid bugs on this //------------- code in the main PS database. Do not contact the owner of this //------------- code directly. Contact the legal team at ‘ZSLegal’ for assistance. //------------- *** WARNING *** //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // This is an internal class that is used to implement parsing and editing of a padding extra field // structure. This extra field is used to optimize the performance dealing with Zip64 extra field. // When we need to create Zip64 extra field the extra padding bytes are used to create such // structure so that the subsequent bytes don't have to be moved. // // History: // 03/23/2006: YoungGK: Added support for Padding Extra Field // //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.IO; using System.Windows; namespace MS.Internal.IO.Zip { ////// This class is used to represent and parse the Padding Extra Field /// /// The Padding Extra Field is defined as: /// Header ID UInt16 (2 bytes) 0xA220 /// Length of the field UInt16 (2 bytes) /// Signature UInt16 (2 bytes) 0xA028 (for verification) /// Padding Initial Value UInt16 (2 bytes) Padding size originally requested by the caller /// Padding ? bytes Padding respresented by null characters /// internal class ZipIOExtraFieldPaddingElement : ZipIOExtraFieldElement { // creates a brand new empty Padding extra field element internal static ZipIOExtraFieldPaddingElement CreateNew() { ZipIOExtraFieldPaddingElement newElement = new ZipIOExtraFieldPaddingElement(); return newElement; } // parse Padding extra field element internal override void ParseDataField(BinaryReader reader, UInt16 size) { // The signature is already read and validated Debug.Assert(size >= MinimumSize); // It is guaranteed that there is enough bytes to read in UInt16 // since it is already checked from ZipIOExtraFieldElement.Parse() _initialRequestedPaddingSize = reader.ReadUInt16(); // need to subtract the size of the signature and size fields // We don't need to use checked{} since size is guaranteed to be bigger than // MinimumFieldDataSize by the called (ZipIOExtraFieldElement.Parse) size -= _minimumFieldDataSize; _paddingSize = size; // Skip the padding if (_paddingSize != 0) { reader.BaseStream.Seek(size, SeekOrigin.Current); } } internal static bool MatchesPaddingSignature(byte[] sniffiedBytes) { if (sniffiedBytes.Length < _signatureSize) { return false; } Debug.Assert(sniffiedBytes.Length == _signatureSize); if (BitConverter.ToUInt16(sniffiedBytes, 0) != _signature) { return false; } return true; } internal override void Save(BinaryWriter writer) { writer.Write(_constantFieldId); writer.Write(SizeField); writer.Write(_signature); writer.Write(_initialRequestedPaddingSize); for (int i = 0; i < _paddingSize; ++i) { writer.Write((byte) 0); } } // This property calculates size of the field on disk (how many bytes need to be allocated on the disk) // id + size field + data field (SizeField) internal override UInt16 Size { get { return checked((UInt16) (SizeField + MinimumSize)); } } // This property calculates the value of the size record whch holds the size without the Id and without the size itself. // we are always guranteed that Size == SizeField + 2 * sizeof(UInt16)) internal override UInt16 SizeField { get { return checked((UInt16) (_minimumFieldDataSize + _paddingSize)); } } static internal UInt16 ConstantFieldId { get { return _constantFieldId; } } static internal UInt16 MinimumFieldDataSize { get { return _minimumFieldDataSize; } } static internal UInt16 SignatureSize { get { return _signatureSize; } } internal UInt16 PaddingSize { get { return _paddingSize; } set { _paddingSize = value; } } //------------------------------------------------------ // // Private Constructor // //----------------------------------------------------- internal ZipIOExtraFieldPaddingElement() : base(_constantFieldId) { _initialRequestedPaddingSize = _newInitialPaddingSize; _paddingSize = _initialRequestedPaddingSize; } //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ //----------------------------------------------------- // // Private fields // //------------------------------------------------------ private const UInt16 _constantFieldId = 0xA220; private const UInt16 _signature = 0xA028; // 20 is the maximum size of Zip64 Extra Field element we can use for Local File Header // (Id, Size, Compressed and UnCompressed Sizes; 2 + 2 + 8 + 8 = 20) // DiskNumber and Relative Offset of Local File Header is not counted since we don't use // it in Local File Header private const UInt16 _newInitialPaddingSize = 20; // UInt16 signature // UInt16 initial requested padding size private static readonly UInt16 _minimumFieldDataSize = 2 * sizeof(UInt16); private static readonly UInt16 _signatureSize = sizeof(UInt16); private UInt16 _paddingSize; private UInt16 _initialRequestedPaddingSize; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ //------------- *** WARNING *** //------------- This file is part of a legally monitored development project. //------------- Do not check in changes to this project. Do not raid bugs on this //------------- code in the main PS database. Do not contact the owner of this //------------- code directly. Contact the legal team at ‘ZSLegal’ for assistance. //------------- *** WARNING *** //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // This is an internal class that is used to implement parsing and editing of a padding extra field // structure. This extra field is used to optimize the performance dealing with Zip64 extra field. // When we need to create Zip64 extra field the extra padding bytes are used to create such // structure so that the subsequent bytes don't have to be moved. // // History: // 03/23/2006: YoungGK: Added support for Padding Extra Field // //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.IO; using System.Windows; namespace MS.Internal.IO.Zip { ////// This class is used to represent and parse the Padding Extra Field /// /// The Padding Extra Field is defined as: /// Header ID UInt16 (2 bytes) 0xA220 /// Length of the field UInt16 (2 bytes) /// Signature UInt16 (2 bytes) 0xA028 (for verification) /// Padding Initial Value UInt16 (2 bytes) Padding size originally requested by the caller /// Padding ? bytes Padding respresented by null characters /// internal class ZipIOExtraFieldPaddingElement : ZipIOExtraFieldElement { // creates a brand new empty Padding extra field element internal static ZipIOExtraFieldPaddingElement CreateNew() { ZipIOExtraFieldPaddingElement newElement = new ZipIOExtraFieldPaddingElement(); return newElement; } // parse Padding extra field element internal override void ParseDataField(BinaryReader reader, UInt16 size) { // The signature is already read and validated Debug.Assert(size >= MinimumSize); // It is guaranteed that there is enough bytes to read in UInt16 // since it is already checked from ZipIOExtraFieldElement.Parse() _initialRequestedPaddingSize = reader.ReadUInt16(); // need to subtract the size of the signature and size fields // We don't need to use checked{} since size is guaranteed to be bigger than // MinimumFieldDataSize by the called (ZipIOExtraFieldElement.Parse) size -= _minimumFieldDataSize; _paddingSize = size; // Skip the padding if (_paddingSize != 0) { reader.BaseStream.Seek(size, SeekOrigin.Current); } } internal static bool MatchesPaddingSignature(byte[] sniffiedBytes) { if (sniffiedBytes.Length < _signatureSize) { return false; } Debug.Assert(sniffiedBytes.Length == _signatureSize); if (BitConverter.ToUInt16(sniffiedBytes, 0) != _signature) { return false; } return true; } internal override void Save(BinaryWriter writer) { writer.Write(_constantFieldId); writer.Write(SizeField); writer.Write(_signature); writer.Write(_initialRequestedPaddingSize); for (int i = 0; i < _paddingSize; ++i) { writer.Write((byte) 0); } } // This property calculates size of the field on disk (how many bytes need to be allocated on the disk) // id + size field + data field (SizeField) internal override UInt16 Size { get { return checked((UInt16) (SizeField + MinimumSize)); } } // This property calculates the value of the size record whch holds the size without the Id and without the size itself. // we are always guranteed that Size == SizeField + 2 * sizeof(UInt16)) internal override UInt16 SizeField { get { return checked((UInt16) (_minimumFieldDataSize + _paddingSize)); } } static internal UInt16 ConstantFieldId { get { return _constantFieldId; } } static internal UInt16 MinimumFieldDataSize { get { return _minimumFieldDataSize; } } static internal UInt16 SignatureSize { get { return _signatureSize; } } internal UInt16 PaddingSize { get { return _paddingSize; } set { _paddingSize = value; } } //------------------------------------------------------ // // Private Constructor // //----------------------------------------------------- internal ZipIOExtraFieldPaddingElement() : base(_constantFieldId) { _initialRequestedPaddingSize = _newInitialPaddingSize; _paddingSize = _initialRequestedPaddingSize; } //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ //----------------------------------------------------- // // Private fields // //------------------------------------------------------ private const UInt16 _constantFieldId = 0xA220; private const UInt16 _signature = 0xA028; // 20 is the maximum size of Zip64 Extra Field element we can use for Local File Header // (Id, Size, Compressed and UnCompressed Sizes; 2 + 2 + 8 + 8 = 20) // DiskNumber and Relative Offset of Local File Header is not counted since we don't use // it in Local File Header private const UInt16 _newInitialPaddingSize = 20; // UInt16 signature // UInt16 initial requested padding size private static readonly UInt16 _minimumFieldDataSize = 2 * sizeof(UInt16); private static readonly UInt16 _signatureSize = sizeof(UInt16); private UInt16 _paddingSize; private UInt16 _initialRequestedPaddingSize; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- Trace.cs
- StylusPointCollection.cs
- QilScopedVisitor.cs
- DataGridCell.cs
- BulletChrome.cs
- Expression.cs
- DrawTreeNodeEventArgs.cs
- _BasicClient.cs
- CorrelationRequestContext.cs
- WizardPanelChangingEventArgs.cs
- ListSourceHelper.cs
- EmptyQuery.cs
- MouseDevice.cs
- ParseChildrenAsPropertiesAttribute.cs
- GridViewDeleteEventArgs.cs
- TextEffectResolver.cs
- PopupControlService.cs
- SystemFonts.cs
- HwndSourceParameters.cs
- ChannelSinkStacks.cs
- WebPermission.cs
- RadioButtonAutomationPeer.cs
- SoapSchemaMember.cs
- ContentElement.cs
- DecimalAnimation.cs
- InlinedAggregationOperator.cs
- WizardForm.cs
- Completion.cs
- PageCache.cs
- DbConnectionStringCommon.cs
- Size3DConverter.cs
- TogglePattern.cs
- HttpHandlerActionCollection.cs
- JsonDataContract.cs
- SuppressIldasmAttribute.cs
- xmlfixedPageInfo.cs
- CultureInfoConverter.cs
- QueryMath.cs
- ExpressionVisitorHelpers.cs
- MsmqOutputMessage.cs
- SystemTcpConnection.cs
- DateTimeUtil.cs
- KeyBinding.cs
- DataListDesigner.cs
- CodeMemberField.cs
- ImpersonateTokenRef.cs
- JavaScriptSerializer.cs
- XmlSerializerOperationGenerator.cs
- SqlTypesSchemaImporter.cs
- ObjectListFieldsPage.cs
- NativeMethods.cs
- LinkArea.cs
- CharAnimationUsingKeyFrames.cs
- SapiRecoInterop.cs
- MemoryMappedViewAccessor.cs
- WebPartConnectVerb.cs
- LayoutInformation.cs
- DesignerActionItemCollection.cs
- OleDbParameterCollection.cs
- ConfigXmlText.cs
- ContentPropertyAttribute.cs
- TypeBuilder.cs
- Style.cs
- RelatedPropertyManager.cs
- ClientUtils.cs
- GridProviderWrapper.cs
- DataControlFieldHeaderCell.cs
- InputScopeNameConverter.cs
- SwitchElementsCollection.cs
- ObjectSpanRewriter.cs
- HttpDictionary.cs
- PropertyMetadata.cs
- Animatable.cs
- TargetConverter.cs
- InkSerializer.cs
- CatalogPartCollection.cs
- LinqDataSourceDisposeEventArgs.cs
- DefaultBindingPropertyAttribute.cs
- IndentTextWriter.cs
- UriParserTemplates.cs
- SecurityDescriptor.cs
- FrameworkElement.cs
- DiagnosticsConfiguration.cs
- TraceSource.cs
- WmpBitmapDecoder.cs
- BookmarkScopeManager.cs
- RequestSecurityToken.cs
- CustomErrorsSection.cs
- HttpCapabilitiesSectionHandler.cs
- ForAllOperator.cs
- Menu.cs
- HttpCacheParams.cs
- isolationinterop.cs
- While.cs
- ISFClipboardData.cs
- FontStretches.cs
- RijndaelCryptoServiceProvider.cs
- Bidi.cs
- TemplateBamlTreeBuilder.cs
- EventData.cs