public ZipUpdate(string fileName, ZipEntry entry)
			{
				command_ = UpdateCommand.Add;
				entry_ = entry;
				filename_ = fileName;
			}
		void ExtractFileEntry(ZipEntry entry, string targetName)
		{
			bool proceed = true;
			if ( overwrite_ != Overwrite.Always ) {
				if ( File.Exists(targetName) ) {
					if ( (overwrite_ == Overwrite.Prompt) && (confirmDelegate_ != null) ) {
						proceed = confirmDelegate_(targetName);
					}
					else {
						proceed = false;
					}
				}
			}
			
			if ( proceed ) {
				if ( events_ != null ) {
					continueRunning_ = events_.OnProcessFile(entry.Name);
				}
			
				if ( continueRunning_ ) {
					try {
						using ( FileStream outputStream = File.Create(targetName) ) {
							if ( buffer_ == null ) {
								buffer_ = new byte[4096];
							}
							if ((events_ != null) && (events_.Progress != null))
							{
								StreamUtils.Copy(zipFile_.GetInputStream(entry), outputStream, buffer_,
									events_.Progress, events_.ProgressInterval, this, entry.Name, entry.Size);
							}
							else
							{
								StreamUtils.Copy(zipFile_.GetInputStream(entry), outputStream, buffer_);
							}
							
							if (events_ != null) {
								continueRunning_ = events_.OnCompletedFile(entry.Name);
							}
						}

#if !NETCF_1_0 && !NETCF_2_0
						if ( restoreDateTimeOnExtract_ ) {
							File.SetLastWriteTime(targetName, entry.DateTime);
						}
						
						if ( RestoreAttributesOnExtract && entry.IsDOSEntry && (entry.ExternalFileAttributes != -1)) {
							FileAttributes fileAttributes = (FileAttributes) entry.ExternalFileAttributes;
							// TODO: FastZip - Setting of other file attributes on extraction is a little trickier.
							fileAttributes &= (FileAttributes.Archive | FileAttributes.Normal | FileAttributes.ReadOnly | FileAttributes.Hidden);
							File.SetAttributes(targetName, fileAttributes);
						}
#endif						
					}
					catch(Exception ex) {
						if ( events_ != null ) {
							continueRunning_ = events_.OnFileFailure(targetName, ex);
						}
						else {
                            continueRunning_ = false;
                            throw;
						}
					}
				}
			}
		}
		// Write the local file header
		// TODO: ZipHelperStream.WriteLocalHeader is not yet used and needs checking for ZipFile and ZipOuptutStream usage
		void WriteLocalHeader(ZipEntry entry, EntryPatchData patchData) 
		{
			CompressionMethod method = entry.CompressionMethod;
			bool headerInfoAvailable = true; // How to get this?
			bool patchEntryHeader = false;

			WriteLEInt(ZipConstants.LocalHeaderSignature);
			
			WriteLEShort(entry.Version);
			WriteLEShort(entry.Flags);
			WriteLEShort((byte)method);
			WriteLEInt((int)entry.DosTime);

			if (headerInfoAvailable == true) {
				WriteLEInt((int)entry.Crc);
				if ( entry.LocalHeaderRequiresZip64 ) {
					WriteLEInt(-1);
					WriteLEInt(-1);
				}
				else {
					WriteLEInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.CryptoHeaderSize : (int)entry.CompressedSize);
					WriteLEInt((int)entry.Size);
				}
			} else {
				if (patchData != null) {
					patchData.CrcPatchOffset = stream_.Position;
				}
				WriteLEInt(0);	// Crc
				
				if ( patchData != null ) {
					patchData.SizePatchOffset = stream_.Position;
				}

				// For local header both sizes appear in Zip64 Extended Information
				if ( entry.LocalHeaderRequiresZip64 && patchEntryHeader ) {
					WriteLEInt(-1);
					WriteLEInt(-1);
				}
				else {
					WriteLEInt(0);	// Compressed size
					WriteLEInt(0);	// Uncompressed size
				}
			}

			byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
			
			if (name.Length > 0xFFFF) {
				throw new ZipException("Entry name too long.");
			}

			ZipExtraData ed = new ZipExtraData(entry.ExtraData);

			if (entry.LocalHeaderRequiresZip64 && (headerInfoAvailable || patchEntryHeader)) {
				ed.StartNewEntry();
				if (headerInfoAvailable) {
					ed.AddLeLong(entry.Size);
					ed.AddLeLong(entry.CompressedSize);
				}
				else {
					ed.AddLeLong(-1);
					ed.AddLeLong(-1);
				}
				ed.AddNewEntry(1);

				if ( !ed.Find(1) ) {
					throw new ZipException("Internal error cant find extra data");
				}
				
				if ( patchData != null ) {
					patchData.SizePatchOffset = ed.CurrentReadIndex;
				}
			}
			else {
				ed.Delete(1);
			}
			
			byte[] extra = ed.GetEntryData();

			WriteLEShort(name.Length);
			WriteLEShort(extra.Length);

			if ( name.Length > 0 ) {
				stream_.Write(name, 0, name.Length);
			}
			
			if ( entry.LocalHeaderRequiresZip64 && patchEntryHeader ) {
				patchData.SizePatchOffset += stream_.Position;
			}

			if ( extra.Length > 0 ) {
				stream_.Write(extra, 0, extra.Length);
			}
		}
		public ZipEntry(ZipEntry entry)
		{
			if ( entry == null ) {
				throw new ArgumentNullException("entry");
			}

			known                  = entry.known;
			name                   = entry.name;
			size                   = entry.size;
			compressedSize         = entry.compressedSize;
			crc                    = entry.crc;
			dosTime                = entry.dosTime;
			method                 = entry.method;
			comment                = entry.comment;
			versionToExtract       = entry.versionToExtract;
			versionMadeBy          = entry.versionMadeBy;
			externalFileAttributes = entry.externalFileAttributes;
			flags                  = entry.flags;

			zipFileIndex           = entry.zipFileIndex;
			offset                 = entry.offset;

			forceZip64_			   = entry.forceZip64_;

			if ( entry.extra != null ) {
				extra = new byte[entry.extra.Length];
				Array.Copy(entry.extra, 0, extra, 0, entry.extra.Length);
			}
		}
		private static void AddExtraDataAES(ZipEntry entry, ZipExtraData extraData) {

			// Vendor Version: AE-1 IS 1. AE-2 is 2. With AE-2 no CRC is required and 0 is stored.
			const int VENDOR_VERSION = 2;
			// Vendor ID is the two ASCII characters "AE".
			const int VENDOR_ID = 0x4541; //not 6965;
			extraData.StartNewEntry();
			// Pack AES extra data field see http://www.winzip.com/aes_info.htm
			//extraData.AddLeShort(7);							// Data size (currently 7)
			extraData.AddLeShort(VENDOR_VERSION);				// 2 = AE-2
			extraData.AddLeShort(VENDOR_ID);					// "AE"
			extraData.AddData(entry.AESEncryptionStrength);		//  1 = 128, 2 = 192, 3 = 256
			extraData.AddLeShort((int)entry.CompressionMethod); // The actual compression method used to compress the file
			extraData.AddNewEntry(0x9901);
		}
		/// <summary>
		/// Gets an input stream for reading the given zip entry data in an uncompressed form.
		/// Normally the <see cref="ZipEntry"/> should be an entry returned by GetEntry().
		/// </summary>
		/// <param name="entry">The <see cref="ZipEntry"/> to obtain a data <see cref="Stream"/> for</param>
		/// <returns>An input <see cref="Stream"/> containing data for this <see cref="ZipEntry"/></returns>
		/// <exception cref="ObjectDisposedException">
		/// The ZipFile has already been closed
		/// </exception>
		/// <exception cref="SolidEdgeContrib.Reader.Native.zlib.Zip.ZipException">
		/// The compression method for the entry is unknown
		/// </exception>
		/// <exception cref="IndexOutOfRangeException">
		/// The entry is not found in the ZipFile
		/// </exception>
		public Stream GetInputStream(ZipEntry entry)
		{
			if ( entry == null ) {
				throw new ArgumentNullException("entry");
			}

			if ( isDisposed_ ) {
				throw new ObjectDisposedException("ZipFile");
			}
			
			long index = entry.ZipFileIndex;
			if ( (index < 0) || (index >= entries_.Length) || (entries_[index].Name != entry.Name) ) {
				index = FindEntry(entry.Name, true);
				if (index < 0) {
					throw new ZipException("Entry cannot be found");
				}
			}
			return GetInputStream(index);			
		}
		/// <summary>
		/// Complete cleanup as the final part of closing.
		/// </summary>
		/// <param name="testCrc">True if the crc value should be tested</param>
		void CompleteCloseEntry(bool testCrc)
		{
			StopDecrypting();
				
			if ((flags & 8) != 0) {
				ReadDataDescriptor();
			}
				
			size = 0;

			if ( testCrc &&
				((crc.Value & 0xFFFFFFFFL) != entry.Crc) && (entry.Crc != -1)) {
				throw new ZipException("CRC mismatch");
			}

			crc.Reset();

			if (method == (int)CompressionMethod.Deflated) {
				inf.Reset();
			}
			entry = null;
		}
			/// <summary>
			/// Copy an existing entry.
			/// </summary>
			/// <param name="entry">The existing entry to copy.</param>
			public ZipUpdate(ZipEntry entry)
				: this(UpdateCommand.Copy, entry)
			{
				// Do nothing.
			}
		void DisposeInternal(bool disposing)
		{
			if ( !isDisposed_ ) {
				isDisposed_ = true;
				entries_ = new ZipEntry[0];
						
				if ( IsStreamOwner && (baseStream_ != null) ) {
					lock(baseStream_) {
						baseStream_.Close();
					}
				}
				
				PostUpdateCleanup();
			}
		}
			public ZipUpdate(ZipEntry original, ZipEntry updated)
			{
				throw new ZipException("Modify not currently supported");
			/*
				command_ = UpdateCommand.Modify;
				entry_ = ( ZipEntry )original.Clone();
				outEntry_ = ( ZipEntry )updated.Clone();
			*/
			}
			public ZipUpdate(UpdateCommand command, ZipEntry entry)
			{
				command_ = command;
				entry_ = ( ZipEntry )entry.Clone();
			}
			public ZipUpdate(IStaticDataSource dataSource, ZipEntry entry)
			{
				command_ = UpdateCommand.Add;
				entry_ = entry;
				dataSource_ = dataSource;
			}
			public ZipUpdate(IStaticDataSource dataSource, string entryName, CompressionMethod compressionMethod)
			{
				command_ = UpdateCommand.Add;
				entry_ = new ZipEntry(entryName);
				entry_.CompressionMethod = compressionMethod;
				dataSource_ = dataSource;
			}
			public ZipUpdate(string fileName, string entryName, CompressionMethod compressionMethod)
			{
				command_ = UpdateCommand.Add;
				entry_ = new ZipEntry(entryName);
				entry_.CompressionMethod = compressionMethod;
				filename_ = fileName;
			}
		/// <summary>
		/// Opens a Zip file reading the given <see cref="Stream"/>.
		/// </summary>
		/// <param name="stream">The <see cref="Stream"/> to read archive data from.</param>
		/// <exception cref="IOException">
		/// An i/o error occurs
		/// </exception>
		/// <exception cref="ZipException">
		/// The stream doesn't contain a valid zip archive.<br/>
		/// </exception>
		/// <exception cref="ArgumentException">
		/// The <see cref="Stream">stream</see> doesnt support seeking.
		/// </exception>
		/// <exception cref="ArgumentNullException">
		/// The <see cref="Stream">stream</see> argument is null.
		/// </exception>
		public ZipFile(Stream stream)
		{
			if ( stream == null ) {
				throw new ArgumentNullException("stream");
			}

			if ( !stream.CanSeek ) {
				throw new ArgumentException("Stream is not seekable", "stream");
			}

			baseStream_  = stream;
			isStreamOwner = true;
		
			if ( baseStream_.Length > 0 ) {
				try {
					ReadEntries();
				}
				catch {
					DisposeInternal(true);
					throw;
				}
			} else {
				entries_ = new ZipEntry[0];
				isNewArchive_ = true;
			}
		}
		/// <summary>
		/// Search for and read the central directory of a zip file filling the entries array.
		/// </summary>
		/// <exception cref="System.IO.IOException">
		/// An i/o error occurs.
		/// </exception>
		/// <exception cref="SolidEdgeContrib.Reader.Native.zlib.Zip.ZipException">
		/// The central directory is malformed or cannot be found
		/// </exception>
		void ReadEntries()
		{
			// Search for the End Of Central Directory.  When a zip comment is
			// present the directory will start earlier
			// 
			// The search is limited to 64K which is the maximum size of a trailing comment field to aid speed.
			// This should be compatible with both SFX and ZIP files but has only been tested for Zip files
			// If a SFX file has the Zip data attached as a resource and there are other resources occuring later then
			// this could be invalid.
			// Could also speed this up by reading memory in larger blocks.			

			if (baseStream_.CanSeek == false) {
				throw new ZipException("ZipFile stream must be seekable");
			}
			
			long locatedEndOfCentralDir = LocateBlockWithSignature(ZipConstants.EndOfCentralDirectorySignature,
				baseStream_.Length, ZipConstants.EndOfCentralRecordBaseSize, 0xffff);
			
			if (locatedEndOfCentralDir < 0) {
				throw new ZipException("Cannot find central directory");
			}

			// Read end of central directory record
			ushort thisDiskNumber           = ReadLEUshort();
			ushort startCentralDirDisk      = ReadLEUshort();
			ulong entriesForThisDisk        = ReadLEUshort();
			ulong entriesForWholeCentralDir = ReadLEUshort();
			ulong centralDirSize            = ReadLEUint();
			long offsetOfCentralDir         = ReadLEUint();
			uint commentSize                = ReadLEUshort();
			
			if ( commentSize > 0 ) {
				byte[] comment = new byte[commentSize]; 

				StreamUtils.ReadFully(baseStream_, comment);
				comment_ = ZipConstants.ConvertToString(comment); 
			}
			else {
				comment_ = string.Empty;
			}
			
			bool isZip64 = false;

			// Check if zip64 header information is required.
			if ( (thisDiskNumber == 0xffff) ||
				(startCentralDirDisk == 0xffff) ||
				(entriesForThisDisk == 0xffff) ||
				(entriesForWholeCentralDir == 0xffff) ||
				(centralDirSize == 0xffffffff) ||
				(offsetOfCentralDir == 0xffffffff) ) {
				isZip64 = true;

				long offset = LocateBlockWithSignature(ZipConstants.Zip64CentralDirLocatorSignature, locatedEndOfCentralDir, 0, 0x1000);
				if ( offset < 0 ) {
					throw new ZipException("Cannot find Zip64 locator");
				}

				// number of the disk with the start of the zip64 end of central directory 4 bytes 
				// relative offset of the zip64 end of central directory record 8 bytes 
				// total number of disks 4 bytes 
				ReadLEUint(); // startDisk64 is not currently used
				ulong offset64 = ReadLEUlong();
				uint totalDisks = ReadLEUint();

				baseStream_.Position = (long)offset64;
				long sig64 = ReadLEUint();

				if ( sig64 != ZipConstants.Zip64CentralFileHeaderSignature ) {
					throw new ZipException(string.Format("Invalid Zip64 Central directory signature at {0:X}", offset64));
				}

				// NOTE: Record size = SizeOfFixedFields + SizeOfVariableData - 12.
				ulong recordSize = ReadLEUlong();
				int versionMadeBy = ReadLEUshort();
				int versionToExtract = ReadLEUshort();
				uint thisDisk = ReadLEUint();
				uint centralDirDisk = ReadLEUint();
				entriesForThisDisk = ReadLEUlong();
				entriesForWholeCentralDir = ReadLEUlong();
				centralDirSize = ReadLEUlong();
				offsetOfCentralDir = (long)ReadLEUlong();

				// NOTE: zip64 extensible data sector (variable size) is ignored.
			}
			
			entries_ = new ZipEntry[entriesForThisDisk];
			
			// SFX/embedded support, find the offset of the first entry vis the start of the stream
			// This applies to Zip files that are appended to the end of an SFX stub.
			// Or are appended as a resource to an executable.
			// Zip files created by some archivers have the offsets altered to reflect the true offsets
			// and so dont require any adjustment here...
			// TODO: Difficulty with Zip64 and SFX offset handling needs resolution - maths?
			if ( !isZip64 && (offsetOfCentralDir < locatedEndOfCentralDir - (4 + (long)centralDirSize)) ) {
				offsetOfFirstEntry = locatedEndOfCentralDir - (4 + (long)centralDirSize + offsetOfCentralDir);
				if (offsetOfFirstEntry <= 0) {
					throw new ZipException("Invalid embedded zip archive");
				}
			}

			baseStream_.Seek(offsetOfFirstEntry + offsetOfCentralDir, SeekOrigin.Begin);
			
			for (ulong i = 0; i < entriesForThisDisk; i++) {
				if (ReadLEUint() != ZipConstants.CentralHeaderSignature) {
					throw new ZipException("Wrong Central Directory signature");
				}
				
				int versionMadeBy      = ReadLEUshort();
				int versionToExtract   = ReadLEUshort();
				int bitFlags           = ReadLEUshort();
				int method             = ReadLEUshort();
				uint dostime           = ReadLEUint();
				uint crc               = ReadLEUint();
				long csize             = (long)ReadLEUint();
				long size              = (long)ReadLEUint();
				int nameLen            = ReadLEUshort();
				int extraLen           = ReadLEUshort();
				int commentLen         = ReadLEUshort();
				
				int diskStartNo        = ReadLEUshort();  // Not currently used
				int internalAttributes = ReadLEUshort();  // Not currently used

				uint externalAttributes = ReadLEUint();
				long offset             = ReadLEUint();
				
				byte[] buffer = new byte[Math.Max(nameLen, commentLen)];
				
				StreamUtils.ReadFully(baseStream_, buffer, 0, nameLen);
				string name = ZipConstants.ConvertToStringExt(bitFlags, buffer, nameLen);
				
				ZipEntry entry = new ZipEntry(name, versionToExtract, versionMadeBy, (CompressionMethod)method);
				entry.Crc = crc & 0xffffffffL;
				entry.Size = size & 0xffffffffL;
				entry.CompressedSize = csize & 0xffffffffL;
				entry.Flags = bitFlags;
				entry.DosTime = (uint)dostime;
				entry.ZipFileIndex = (long)i;
				entry.Offset = offset;
				entry.ExternalFileAttributes = (int)externalAttributes;

				if ((bitFlags & 8) == 0) {
					entry.CryptoCheckValue = (byte)(crc >> 24);
				}
				else {
					entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff);
				}

				if (extraLen > 0) {
					byte[] extra = new byte[extraLen];
					StreamUtils.ReadFully(baseStream_, extra);
					entry.ExtraData = extra;
				}

				entry.ProcessExtraData(false);
				
				if (commentLen > 0) {
					StreamUtils.ReadFully(baseStream_, buffer, 0, commentLen);
					entry.Comment = ZipConstants.ConvertToStringExt(bitFlags, buffer, commentLen);
				}
				
				entries_[i] = entry;
			}
		}
		/// <summary>
		/// Initialises a default <see cref="ZipFile"/> instance with no entries and no file storage.
		/// </summary>
		internal ZipFile()
		{
			entries_ = new ZipEntry[0];
			isNewArchive_ = true;
		}
		/// <summary>
		/// Locate the data for a given entry.
		/// </summary>
		/// <returns>
		/// The start offset of the data.
		/// </returns>
		/// <exception cref="System.IO.EndOfStreamException">
		/// The stream ends prematurely
		/// </exception>
		/// <exception cref="SolidEdgeContrib.Reader.Native.zlib.Zip.ZipException">
		/// The local header signature is invalid, the entry and central header file name lengths are different
		/// or the local and entry compression methods dont match
		/// </exception>
		long LocateEntry(ZipEntry entry)
		{
			return TestLocalHeader(entry, HeaderTest.Extract);
		}
		/// <summary>
		/// Advances to the next entry in the archive
		/// </summary>
		/// <returns>
		/// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries.
		/// </returns>
		/// <remarks>
		/// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called.
		/// </remarks>
		/// <exception cref="InvalidOperationException">
		/// Input stream is closed
		/// </exception>
		/// <exception cref="ZipException">
		/// Password is not set, password is invalid, compression method is invalid,
		/// version required to extract is not supported
		/// </exception>
		public ZipEntry GetNextEntry()
		{
			if (crc == null) {
				throw new InvalidOperationException("Closed.");
			}
			
			if (entry != null) {
				CloseEntry();
			}
			
			int header = inputBuffer.ReadLeInt();
			
			if (header == ZipConstants.CentralHeaderSignature ||
				header == ZipConstants.EndOfCentralDirectorySignature ||
				header == ZipConstants.CentralHeaderDigitalSignature ||
				header == ZipConstants.ArchiveExtraDataSignature ||
				header == ZipConstants.Zip64CentralFileHeaderSignature) {
				// No more individual entries exist
				Close();
				return null;
			}
			
			// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found
			// Spanning signature is same as descriptor signature and is untested as yet.
			if ( (header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature) ) {
				header = inputBuffer.ReadLeInt();
			}
			
			if (header != ZipConstants.LocalHeaderSignature) {
				throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header));
			}
			
			short versionRequiredToExtract = (short)inputBuffer.ReadLeShort();
			
			flags          = inputBuffer.ReadLeShort();
			method         = inputBuffer.ReadLeShort();
			uint dostime   = (uint)inputBuffer.ReadLeInt();
			int crc2       = inputBuffer.ReadLeInt();
			csize          = inputBuffer.ReadLeInt();
			size           = inputBuffer.ReadLeInt();
			int nameLen    = inputBuffer.ReadLeShort();
			int extraLen   = inputBuffer.ReadLeShort();
			
			bool isCrypted = (flags & 1) == 1;
			
			byte[] buffer = new byte[nameLen];
			inputBuffer.ReadRawBuffer(buffer);
			
			string name = ZipConstants.ConvertToStringExt(flags, buffer);
			
			entry = new ZipEntry(name, versionRequiredToExtract);
			entry.Flags = flags;
			
			entry.CompressionMethod = (CompressionMethod)method;
			
			if ((flags & 8) == 0) {
				entry.Crc  = crc2 & 0xFFFFFFFFL;
				entry.Size = size & 0xFFFFFFFFL;
				entry.CompressedSize = csize & 0xFFFFFFFFL;

				entry.CryptoCheckValue = (byte)((crc2 >> 24) & 0xff);

			} else {
				
				// This allows for GNU, WinZip and possibly other archives, the PKZIP spec
				// says these values are zero under these circumstances.
				if (crc2 != 0) {
					entry.Crc = crc2 & 0xFFFFFFFFL;
				}
				
				if (size != 0) {
					entry.Size = size & 0xFFFFFFFFL;
				}

				if (csize != 0) {
					entry.CompressedSize = csize & 0xFFFFFFFFL;
				}

				entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff);
			}
			
			entry.DosTime = dostime;

			// If local header requires Zip64 is true then the extended header should contain
			// both values.

			// Handle extra data if present.  This can set/alter some fields of the entry.
			if (extraLen > 0) {
				byte[] extra = new byte[extraLen];
				inputBuffer.ReadRawBuffer(extra);
				entry.ExtraData = extra;
			}

			entry.ProcessExtraData(true);
			if ( entry.CompressedSize >= 0 ) {
				csize = entry.CompressedSize;
			}

			if ( entry.Size >= 0 ) {
				size = entry.Size;
			}
			
			if (method == (int)CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CryptoHeaderSize != size))) {
				throw new ZipException("Stored, but compressed != uncompressed");
			}

			// Determine how to handle reading of data if this is attempted.
			if (entry.IsCompressionMethodSupported()) {
				internalReader = new ReadDataHandler(InitialRead);
			} else {
				internalReader = new ReadDataHandler(ReadingNotSupported);
			}
			
			return entry;
		}
		Stream CreateAndInitDecryptionStream(Stream baseStream, ZipEntry entry)
		{
			CryptoStream result = null;

			if ( (entry.Version < ZipConstants.VersionStrongEncryption)
				|| (entry.Flags & (int)GeneralBitFlags.StrongEncryption) == 0) {
				PkzipClassicManaged classicManaged = new PkzipClassicManaged();

				OnKeysRequired(entry.Name);
				if (HaveKeys == false) {
					throw new ZipException("No password available for encrypted stream");
				}

				result = new CryptoStream(baseStream, classicManaged.CreateDecryptor(key, null), CryptoStreamMode.Read);
				CheckClassicPassword(result, entry);
			}
			else {
#if !NET_1_1 && !NETCF_2_0
				if (entry.Version == ZipConstants.VERSION_AES) {
					//
					OnKeysRequired(entry.Name);
					if (HaveKeys == false) {
						throw new ZipException("No password available for AES encrypted stream");
					}
					int saltLen = entry.AESSaltLen;
					byte[] saltBytes = new byte[saltLen];
					int saltIn = baseStream.Read(saltBytes, 0, saltLen);
					if (saltIn != saltLen)
						throw new ZipException("AES Salt expected " + saltLen + " got " + saltIn);
					//
					byte[] pwdVerifyRead = new byte[2];
					baseStream.Read(pwdVerifyRead, 0, 2);
					int blockSize = entry.AESKeySize / 8;	// bits to bytes

					ZipAESTransform decryptor = new ZipAESTransform(rawPassword_, saltBytes, blockSize, false);
					byte[] pwdVerifyCalc = decryptor.PwdVerifier;
					if (pwdVerifyCalc[0] != pwdVerifyRead[0] || pwdVerifyCalc[1] != pwdVerifyRead[1])
						throw new Exception("Invalid password for AES");
					result = new ZipAESStream(baseStream, decryptor, CryptoStreamMode.Read);
				}
				else
#endif
				{
					throw new ZipException("Decryption method not supported");
				}
			}

			return result;
		}
		/// <summary>
		/// Closes the zip input stream
		/// </summary>
		public override void Close()
		{
			internalReader = new ReadDataHandler(ReadingNotAvailable);
			crc = null;
			entry = null;

			base.Close();
		}
		Stream CreateAndInitEncryptionStream(Stream baseStream, ZipEntry entry)
		{
			CryptoStream result = null;
			if ( (entry.Version < ZipConstants.VersionStrongEncryption)
				|| (entry.Flags & (int)GeneralBitFlags.StrongEncryption) == 0) {
				PkzipClassicManaged classicManaged = new PkzipClassicManaged();

				OnKeysRequired(entry.Name);
				if (HaveKeys == false) {
					throw new ZipException("No password available for encrypted stream");
				}

				// Closing a CryptoStream will close the base stream as well so wrap it in an UncompressedStream
				// which doesnt do this.
				result = new CryptoStream(new UncompressedStream(baseStream),
					classicManaged.CreateEncryptor(key, null), CryptoStreamMode.Write);

				if ( (entry.Crc < 0) || (entry.Flags & 8) != 0) {
					WriteEncryptionHeader(result, entry.DosTime << 16);
				}
				else {
					WriteEncryptionHeader(result, entry.Crc);
				}
			}
			return result;
		}
		/// <summary>
		/// Starts a new Zip entry. It automatically closes the previous
		/// entry if present.
		/// All entry elements bar name are optional, but must be correct if present.
		/// If the compression method is stored and the output is not patchable
		/// the compression for that entry is automatically changed to deflate level 0
		/// </summary>
		/// <param name="entry">
		/// the entry.
		/// </param>
		/// <exception cref="System.ArgumentNullException">
		/// if entry passed is null.
		/// </exception>
		/// <exception cref="System.IO.IOException">
		/// if an I/O error occured.
		/// </exception>
		/// <exception cref="System.InvalidOperationException">
		/// if stream was finished
		/// </exception>
		/// <exception cref="ZipException">
		/// Too many entries in the Zip file<br/>
		/// Entry name is too long<br/>
		/// Finish has already been called<br/>
		/// </exception>
		public void PutNextEntry(ZipEntry entry)
		{
			if ( entry == null ) {
				throw new ArgumentNullException("entry");
			}

			if (entries == null) {
				throw new InvalidOperationException("ZipOutputStream was finished");
			}
			
			if (curEntry != null) {
				CloseEntry();
			}

			if (entries.Count == int.MaxValue) {
				throw new ZipException("Too many entries for Zip file");
			}
			
			CompressionMethod method = entry.CompressionMethod;
			int compressionLevel = defaultCompressionLevel;
			
			// Clear flags that the library manages internally
			entry.Flags &= (int)GeneralBitFlags.UnicodeText;
			patchEntryHeader = false;

			bool headerInfoAvailable;

			// No need to compress - definitely no data.
			if (entry.Size == 0)
			{
				entry.CompressedSize = entry.Size;
				entry.Crc = 0;
				method = CompressionMethod.Stored;
				headerInfoAvailable = true;
			}
			else
			{
				headerInfoAvailable = (entry.Size >= 0) && entry.HasCrc;

				// Switch to deflation if storing isnt possible.
				if (method == CompressionMethod.Stored)
				{
					if (!headerInfoAvailable)
					{
						if (!CanPatchEntries)
						{
							// Can't patch entries so storing is not possible.
							method = CompressionMethod.Deflated;
							compressionLevel = 0;
						}
					}
					else // entry.size must be > 0
					{
						entry.CompressedSize = entry.Size;
						headerInfoAvailable = entry.HasCrc;
					}
				}
			}

			if (headerInfoAvailable == false) {
				if (CanPatchEntries == false) {
					// Only way to record size and compressed size is to append a data descriptor
					// after compressed data.

					// Stored entries of this form have already been converted to deflating.
					entry.Flags |= 8;
				} else {
					patchEntryHeader = true;
				}
			}
			
			if (Password != null) {
				entry.IsCrypted = true;
				if (entry.Crc < 0) {
					// Need to append a data descriptor as the crc isnt available for use
					// with encryption, the date is used instead.  Setting the flag
					// indicates this to the decompressor.
					entry.Flags |= 8;
				}
			}

			entry.Offset = offset;
			entry.CompressionMethod = (CompressionMethod)method;
			
			curMethod = method;
			sizePatchPos = -1;
			
			if ( (useZip64_ == UseZip64.On) || ((entry.Size < 0) && (useZip64_ == UseZip64.Dynamic)) ) {
				entry.ForceZip64();
			}

			// Write the local file header
			WriteLeInt(ZipConstants.LocalHeaderSignature);
			
			WriteLeShort(entry.Version);
			WriteLeShort(entry.Flags);
			WriteLeShort((byte)entry.CompressionMethodForHeader);
			WriteLeInt((int)entry.DosTime);

			// TODO: Refactor header writing.  Its done in several places.
			if (headerInfoAvailable == true) {
				WriteLeInt((int)entry.Crc);
				if ( entry.LocalHeaderRequiresZip64 ) {
					WriteLeInt(-1);
					WriteLeInt(-1);
				}
				else {
					WriteLeInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.CryptoHeaderSize : (int)entry.CompressedSize);
					WriteLeInt((int)entry.Size);
				}
			} else {
				if (patchEntryHeader) {
					crcPatchPos = baseOutputStream_.Position;
				}
				WriteLeInt(0);	// Crc
				
				if ( patchEntryHeader ) {
					sizePatchPos = baseOutputStream_.Position;
				}

				// For local header both sizes appear in Zip64 Extended Information
				if ( entry.LocalHeaderRequiresZip64 || patchEntryHeader ) {
					WriteLeInt(-1);
					WriteLeInt(-1);
				}
				else {
					WriteLeInt(0);	// Compressed size
					WriteLeInt(0);	// Uncompressed size
				}
			}

			byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
			
			if (name.Length > 0xFFFF) {
				throw new ZipException("Entry name too long.");
			}

			ZipExtraData ed = new ZipExtraData(entry.ExtraData);

			if (entry.LocalHeaderRequiresZip64) {
				ed.StartNewEntry();
				if (headerInfoAvailable) {
					ed.AddLeLong(entry.Size);
					ed.AddLeLong(entry.CompressedSize);
				}
				else {
					ed.AddLeLong(-1);
					ed.AddLeLong(-1);
				}
				ed.AddNewEntry(1);

				if ( !ed.Find(1) ) {
					throw new ZipException("Internal error cant find extra data");
				}
				
				if ( patchEntryHeader ) {
					sizePatchPos = ed.CurrentReadIndex;
				}
			}
			else {
				ed.Delete(1);
			}

#if !NET_1_1 && !NETCF_2_0
			if (entry.AESKeySize > 0) {
				AddExtraDataAES(entry, ed);
			}
#endif
			byte[] extra = ed.GetEntryData();

			WriteLeShort(name.Length);
			WriteLeShort(extra.Length);

			if ( name.Length > 0 ) {
				baseOutputStream_.Write(name, 0, name.Length);
			}
			
			if ( entry.LocalHeaderRequiresZip64 && patchEntryHeader ) {
				sizePatchPos += baseOutputStream_.Position;
			}

			if ( extra.Length > 0 ) {
				baseOutputStream_.Write(extra, 0, extra.Length);
			}
			
			offset += ZipConstants.LocalHeaderBaseSize + name.Length + extra.Length;
			// Fix offsetOfCentraldir for AES
			if (entry.AESKeySize > 0)
				offset += entry.AESOverheadSize;
			
			// Activate the entry.
			curEntry = entry;
			crc.Reset();
			if (method == CompressionMethod.Deflated) {
				deflater_.Reset();
				deflater_.SetLevel(compressionLevel);
			}
			size = 0;

			if (entry.IsCrypted) {
#if !NET_1_1 && !NETCF_2_0
				if (entry.AESKeySize > 0) {
					WriteAESHeader(entry);
				} else
#endif
				{
					if (entry.Crc < 0) {			// so testing Zip will says its ok
						WriteEncryptionHeader(entry.DosTime << 16);
					} else {
						WriteEncryptionHeader(entry.Crc);
					}
				}
			}
		}
		static void CheckClassicPassword(CryptoStream classicCryptoStream, ZipEntry entry)
		{
			byte[] cryptbuffer = new byte[ZipConstants.CryptoHeaderSize];
			StreamUtils.ReadFully(classicCryptoStream, cryptbuffer);
			if (cryptbuffer[ZipConstants.CryptoHeaderSize - 1] != entry.CryptoCheckValue) {
				throw new ZipException("Invalid password");
			}
		}
		// Replaces WriteEncryptionHeader for AES
		//
		private void WriteAESHeader(ZipEntry entry) {
			byte[] salt;
			byte[] pwdVerifier;
			InitializeAESPassword(entry, Password, out salt, out pwdVerifier);
			// File format for AES:
			// Size (bytes)   Content
			// ------------   -------
			// Variable       Salt value
			// 2              Password verification value
			// Variable       Encrypted file data
			// 10             Authentication code
			//
			// Value in the "compressed size" fields of the local file header and the central directory entry
			// is the total size of all the items listed above. In other words, it is the total size of the
			// salt value, password verification value, encrypted data, and authentication code.
			baseOutputStream_.Write(salt, 0, salt.Length);
			baseOutputStream_.Write(pwdVerifier, 0, pwdVerifier.Length);
		}
			public ZipEntryEnumerator(ZipEntry[] entries)
			{
				array = entries;
			}
		void ExtractEntry(ZipEntry entry)
		{
			bool doExtraction = entry.IsCompressionMethodSupported();
			string targetName = entry.Name;
			
			if ( doExtraction ) {
				if ( entry.IsFile ) {
					targetName = extractNameTransform_.TransformFile(targetName);
				}
				else if ( entry.IsDirectory ) {
					targetName = extractNameTransform_.TransformDirectory(targetName);
				}
				
				doExtraction = !((targetName == null) || (targetName.Length == 0));
			}
			
			// TODO: Fire delegate/throw exception were compression method not supported, or name is invalid?

			string dirName = null;
			
			if ( doExtraction ) {
					if ( entry.IsDirectory ) {
						dirName = targetName;
					}
					else {
						dirName = Path.GetDirectoryName(Path.GetFullPath(targetName));
					}
			}
			
			if ( doExtraction && !Directory.Exists(dirName) ) {
				if ( !entry.IsDirectory || CreateEmptyDirectories ) {
					try {
						Directory.CreateDirectory(dirName);
					}
					catch (Exception ex) {
						doExtraction = false;
						if ( events_ != null ) {
							if ( entry.IsDirectory ) {
								continueRunning_ = events_.OnDirectoryFailure(targetName, ex);
							}
							else {
								continueRunning_ = events_.OnFileFailure(targetName, ex);
							}
						}
						else {
							continueRunning_ = false;
                            throw;
						}
					}
				}
			}
			
			if ( doExtraction && entry.IsFile ) {
				ExtractFileEntry(entry, targetName);
			}
		}
		/// <summary>
		/// Get a <see cref="Stream"/> providing data for an entry.
		/// </summary>
		/// <param name="entry">The entry to provide data for.</param>
		/// <param name="name">The file name for data if known.</param>
		/// <returns>Returns a stream providing data; or null if not available</returns>
		public Stream GetSource(ZipEntry entry, string name)
		{
			Stream result = null;

			if ( name != null ) {
				result = File.Open(name, FileMode.Open, FileAccess.Read, FileShare.Read);
			}

			return result;
		}
		/// <summary>
		/// Write a data descriptor.
		/// </summary>
		/// <param name="entry">The entry to write a descriptor for.</param>
		/// <returns>Returns the number of descriptor bytes written.</returns>
		public int WriteDataDescriptor(ZipEntry entry)
		{
			if (entry == null) {
				throw new ArgumentNullException("entry");
			}

			int result=0;

			// Add data descriptor if flagged as required
			if ((entry.Flags & (int)GeneralBitFlags.Descriptor) != 0)
			{
				// The signature is not PKZIP originally but is now described as optional
				// in the PKZIP Appnote documenting trhe format.
				WriteLEInt(ZipConstants.DataDescriptorSignature);
				WriteLEInt(unchecked((int)(entry.Crc)));

				result+=8;

				if (entry.LocalHeaderRequiresZip64)
				{
					WriteLELong(entry.CompressedSize);
					WriteLELong(entry.Size);
					result+=16;
				}
				else
				{
					WriteLEInt((int)entry.CompressedSize);
					WriteLEInt((int)entry.Size);
					result+=8;
				}
			}

			return result;
		}
		internal void SetEntry(ZipEntry entry)
		{
			entry_ = entry;
			entryValid_ = true;
			bytesTested_ = 0;
		}