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
- TreeView.cs
- UiaCoreTypesApi.cs
- UnsafeNativeMethods.cs
- SqlDependencyListener.cs
- HtmlTextArea.cs
- Storyboard.cs
- StringInfo.cs
- TraceSwitch.cs
- WindowsScroll.cs
- DataGridCommandEventArgs.cs
- CommentAction.cs
- PeerNameResolver.cs
- X509Certificate2Collection.cs
- CommandPlan.cs
- SemanticAnalyzer.cs
- SqlUserDefinedTypeAttribute.cs
- OletxDependentTransaction.cs
- odbcmetadatacolumnnames.cs
- ExclusiveCanonicalizationTransform.cs
- FixedSchema.cs
- InertiaRotationBehavior.cs
- InputBinding.cs
- DesignerRegion.cs
- SAPIEngineTypes.cs
- PackageRelationshipCollection.cs
- Native.cs
- Parameter.cs
- WriteableBitmap.cs
- StylusPointPropertyInfoDefaults.cs
- CommandHelper.cs
- BitmapCodecInfoInternal.cs
- xml.cs
- RC2CryptoServiceProvider.cs
- ToolStripRenderer.cs
- IDispatchConstantAttribute.cs
- SqlDataSource.cs
- TextTreeInsertElementUndoUnit.cs
- EDesignUtil.cs
- Stack.cs
- RoleServiceManager.cs
- IIS7UserPrincipal.cs
- WmfPlaceableFileHeader.cs
- StylusPointPropertyUnit.cs
- ScriptRegistrationManager.cs
- ApplicationSettingsBase.cs
- SQLSingleStorage.cs
- mediaeventshelper.cs
- RuleSetCollection.cs
- ProxyWebPartManager.cs
- LineGeometry.cs
- DBSqlParserColumn.cs
- ModifiableIteratorCollection.cs
- DataGridViewRowsAddedEventArgs.cs
- CommandField.cs
- FontStyleConverter.cs
- CodeVariableReferenceExpression.cs
- DataTableNewRowEvent.cs
- SchemaElementLookUpTableEnumerator.cs
- AddInProcess.cs
- NamespaceMapping.cs
- AbstractSvcMapFileLoader.cs
- PaintValueEventArgs.cs
- Helper.cs
- DragDrop.cs
- SectionVisual.cs
- Validator.cs
- ImageInfo.cs
- AddInControllerImpl.cs
- PrinterUnitConvert.cs
- DependencyProperty.cs
- DataRelationPropertyDescriptor.cs
- ZoneLinkButton.cs
- PropertyEmitterBase.cs
- ErasingStroke.cs
- PathGeometry.cs
- UnsafeNativeMethods.cs
- TokenBasedSetEnumerator.cs
- CngKeyCreationParameters.cs
- SafeProcessHandle.cs
- ObjectNavigationPropertyMapping.cs
- SafeHandle.cs
- AuthorizationSection.cs
- CatalogPartDesigner.cs
- ModelUIElement3D.cs
- XmlRawWriter.cs
- EntityProxyTypeInfo.cs
- Listener.cs
- PersonalizationStateQuery.cs
- DataGridHeaderBorder.cs
- ModulesEntry.cs
- XamlParser.cs
- ObjectParameterCollection.cs
- NamedPipeWorkerProcess.cs
- StickyNoteAnnotations.cs
- DataListItem.cs
- DateBoldEvent.cs
- SourceFileInfo.cs
- TextBoxAutomationPeer.cs
- ToolStripOverflow.cs
- FormatterConverter.cs