Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Zip / ZipIOExtraFieldElement.cs / 1305600 / ZipIOExtraFieldElement.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 generic extra field structure. // It doesn't contain informaton about any specific (like Zip64) extra fields that are supported by // this implementation. In order to isolate this from IO and streams, it deals with the data in the Byte[] form // // History: // 11/19/2004: IgorBel: Initial creation. // 03/23/2006: [....]: Added support for Padding Extra Field // //----------------------------------------------------------------------------- using System; using System.IO; using System.Diagnostics; using System.Collections; using System.Globalization; using System.Runtime.Serialization; using System.Windows; using MS.Internal.IO.Packaging; using MS.Internal.WindowsBase; namespace MS.Internal.IO.Zip { ////// This is an internal class that is used to implement parsing and editing of generic extra field structures. /// It doesn't contain informaton about any specific (like Zip64) extra fields that are supported by /// this implementation. In order to isolate this from IO and streams, it deals with the data in the Byte[] form /// internal class ZipIOExtraFieldElement { internal static ZipIOExtraFieldElement Parse(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage) { // we can safely parse the Id and Size here // since the minimum size is checked from the caller (ZipIoExtraField) UInt16 id = reader.ReadUInt16(); UInt16 size = reader.ReadUInt16(); ZipIOExtraFieldElement newElement; if (id == ZipIOExtraFieldZip64Element.ConstantFieldId) // Found Zip64 Extra Field element { newElement = new ZipIOExtraFieldZip64Element(); ((ZipIOExtraFieldZip64Element) newElement).Zip64ExtraFieldUsage = zip64extraFieldUsage; } else if (id == ZipIOExtraFieldPaddingElement.ConstantFieldId) // Found potential Padding Extra Field element { // Even if the id matches Padding Extra Element id, we cannot be sure if it is Microsoft defined one // until its signature is verified // This extra field matches Padding Extra Element id, but it is not big enough to be ours if (size < ZipIOExtraFieldPaddingElement.MinimumFieldDataSize) { // Treat it as an unknown Extra Field element newElement = new ZipIOExtraFieldElement(id); } else { // Sniff bytes to check it it matches our Padding extra field signature byte[] sniffedBytes = reader.ReadBytes(ZipIOExtraFieldPaddingElement.SignatureSize); if (ZipIOExtraFieldPaddingElement.MatchesPaddingSignature(sniffedBytes)) { // Signature matches the Padding Extra Field signature newElement = new ZipIOExtraFieldPaddingElement(); } else { // Signature doesn't match; treat it a an unknown Extra Field element newElement = new ZipIOExtraFieldElement(id, sniffedBytes); } } } else { newElement = new ZipIOExtraFieldElement(id); } // Parse the data field of the Extra Field element newElement.ParseDataField(reader, size); return newElement; } internal virtual void ParseDataField(BinaryReader reader, UInt16 size) { if (_data == null) { _data = reader.ReadBytes(size); //vaiadte that we didn't reach the end of stream too early if (_data.Length != size) { throw new FileFormatException(SR.Get(SRID.CorruptedData)); } } else // There were some data we sniffed already { Byte[] tempBuffer = _data; _data = new Byte[size]; Array.Copy(tempBuffer, _data, _size); // _size contains the size of data in _data checked { Debug.Assert(size >= _size); if ((PackagingUtilities.ReliableRead(reader, _data, _size, size - _size) + _size) != size) throw new FileFormatException(SR.Get(SRID.CorruptedData)); } } _size = size; } internal virtual void Save(BinaryWriter writer) { Debug.Assert(_size == _data.Length); writer.Write(_id); writer.Write(_size); writer.Write(_data); } // This property calculates the value of the size record whch holds the size without the Id and without the size itself. // we are alkways guranteed that Size == SizeField + 2 * sizeof(UInt16)) internal virtual UInt16 SizeField { get { return _size; } } // this fiels needs to be used very carefully as it retuns a writeble array // element of which could be potentially modifyed by the caller internal virtual byte[] DataField { get { return _data; } } // This property calculates size of the field on disk (how many bytes need to be allocated on the disk) internal virtual UInt16 Size { get { return checked((UInt16) (_size + _minimumSize)); // the real field size has 2 UInt16 fields for Id and size } } // Minimum size of any type of Extra Field Element // UInt16 id // UInt16 size internal static UInt16 MinimumSize { get { return _minimumSize; } } //------------------------------------------------------ // // Private Constructor // //----------------------------------------------------- internal ZipIOExtraFieldElement(UInt16 id) { _id = id; } // data: sniffied data field private ZipIOExtraFieldElement(UInt16 id, byte[] data) { Debug.Assert(data != null); _id = id; _data = data; _size = checked((UInt16) data.Length); } //------------------------------------------------------ // // Private fields // //------------------------------------------------------ private UInt16 _id; private UInt16 _size; private byte[] _data; // UInt16 id: 2 // UInt16 size: 2 private static readonly UInt16 _minimumSize = (UInt16) (2 * sizeof(UInt16)); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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