Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Zip / ZipIOExtraFieldZip64Element.cs / 1305600 / ZipIOExtraFieldZip64Element.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 helps managing/parsing the // ZIP64 Extended Information Extra Field (0x0001): for OPC scenarios // In order to isolate this from IO and streams, it deals with the data in the Byte[] form // // History: // 05/16/2005: IgorBel: Initial creation. // //----------------------------------------------------------------------------- using System; using System.IO; using System.Diagnostics; using System.Windows; using MS.Internal.WindowsBase; namespace MS.Internal.IO.Zip { internal enum ZipIOZip64ExtraFieldUsage { None = 0, UncompressedSize = 1, CompressedSize = 2, OffsetOfLocalHeader = 4, DiskNumber = 8, } ////// This class is used to represent and parse the the /// ZIP64 Extended Information Extra Field (0x0001) /// In order to isolate this from IO and streams it deals with the data in the Byte[] form /// internal class ZipIOExtraFieldZip64Element : ZipIOExtraFieldElement { // creates brand new empty ZIP 64 extra field element internal static ZipIOExtraFieldZip64Element CreateNew() { ZipIOExtraFieldZip64Element newElement = new ZipIOExtraFieldZip64Element(); return newElement; } // extracts ZIP 64 extra field element from a given byte array internal override void ParseDataField(BinaryReader reader, UInt16 size) { Debug.Assert(reader != null); if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.UncompressedSize) != 0) { _uncompressedSize = reader.ReadUInt64(); if (size < sizeof(UInt64)) { throw new FileFormatException(SR.Get(SRID.CorruptedData)); } size -= sizeof(UInt64); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.CompressedSize) != 0) { _compressedSize = reader.ReadUInt64(); if (size < sizeof(UInt64)) { throw new FileFormatException(SR.Get(SRID.CorruptedData)); } size -= sizeof(UInt64); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader) != 0) { _offsetOfLocalHeader = reader.ReadUInt64(); if (size < sizeof(UInt64)) { throw new FileFormatException(SR.Get(SRID.CorruptedData)); } size -= sizeof(UInt64); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.DiskNumber) != 0) { _diskNumber = reader.ReadUInt32(); if (size < sizeof(UInt32)) { throw new FileFormatException(SR.Get(SRID.CorruptedData)); } size -= sizeof(UInt32); } if (size != 0) { throw new FileFormatException(SR.Get(SRID.CorruptedData)); } Validate(); } internal override void Save(BinaryWriter writer) { // if it is == 0 we shouldn't be persisting this Debug.Assert(SizeField>0); writer.Write(_constantFieldId); writer.Write(SizeField); if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.UncompressedSize) != 0) { writer.Write(_uncompressedSize); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.CompressedSize) != 0) { writer.Write(_compressedSize); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader) != 0) { writer.Write(_offsetOfLocalHeader); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.DiskNumber) != 0) { writer.Write(_diskNumber); } } // This property calculates size of the field on disk (how many bytes need to be allocated on the disk) internal override UInt16 Size { get { if (SizeField == 0) // we do not need to save this, if it is empty { return 0; } else { 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 { UInt16 size = 0; if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.UncompressedSize) != 0) { size += sizeof(UInt64); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.CompressedSize) != 0) { size += sizeof(UInt64); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader) != 0) { size += sizeof(UInt64); } if ((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.DiskNumber) != 0) { size += sizeof(UInt32); } return size; } } static internal UInt16 ConstantFieldId { get { return _constantFieldId; } } internal long UncompressedSize { get { // we should never be asked to provide such value, if we do not have it Debug.Assert((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.UncompressedSize) != 0); return (long)_uncompressedSize; } set { Debug.Assert(value >=0 ); _zip64ExtraFieldUsage |= ZipIOZip64ExtraFieldUsage.UncompressedSize; _uncompressedSize = (UInt64)value; } } internal long CompressedSize { get { // we should never be asked to provide such value, if we do not have it Debug.Assert((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.CompressedSize) != 0); return (long)_compressedSize; } set { Debug.Assert(value >=0 ); _zip64ExtraFieldUsage |= ZipIOZip64ExtraFieldUsage.CompressedSize; _compressedSize = (UInt64)value; } } internal long OffsetOfLocalHeader { get { // we should never be asked to provide such value, if we do not have it Debug.Assert((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader) != 0); return (long)_offsetOfLocalHeader; } set { Debug.Assert(value >=0 ); _zip64ExtraFieldUsage |= ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader; _offsetOfLocalHeader = (UInt64)value; } } internal UInt32 DiskNumber { get { // we should never be asked to provide such value, if we do not have it Debug.Assert((_zip64ExtraFieldUsage & ZipIOZip64ExtraFieldUsage.DiskNumber) != 0); return _diskNumber; } // set{} for now we do not need to support set on this property // the only reason to set is an attempt to produce multi disk archives } internal ZipIOZip64ExtraFieldUsage Zip64ExtraFieldUsage { get { return _zip64ExtraFieldUsage; } set { _zip64ExtraFieldUsage = value; } } //------------------------------------------------------ // // Private Constructor // //----------------------------------------------------- internal ZipIOExtraFieldZip64Element() : base(_constantFieldId) { _zip64ExtraFieldUsage = ZipIOZip64ExtraFieldUsage.None; } //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ private void Validate () { // throw if we got any negative values if ((_compressedSize >= Int64.MaxValue) || (_uncompressedSize >= Int64.MaxValue) || (_offsetOfLocalHeader >= Int64.MaxValue)) { throw new NotSupportedException(SR.Get(SRID.Zip64StructuresTooLarge)); } // throw if disk number isn't == 0 if (_diskNumber != 0) { throw new NotSupportedException(SR.Get(SRID.NotSupportedMultiDisk)); } } //----------------------------------------------------- // // Private fields // //------------------------------------------------------ private const UInt16 _constantFieldId = 0x01; private UInt64 _uncompressedSize; private UInt64 _compressedSize; private UInt64 _offsetOfLocalHeader; private UInt32 _diskNumber; private ZipIOZip64ExtraFieldUsage _zip64ExtraFieldUsage; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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