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);
            }
        }
        /// <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;
        }
        // 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);
            }
        }
        /// <summary>
        /// Make a new <see cref="ZipEntry"/> from a name.
        /// </summary>
        /// <param name="fileName">The name of the file to create a new entry for.</param>
        /// <param name="useFileSystem">If true entry detail is retrieved from the file system if the file exists.</param>
        /// <returns>Returns a new <see cref="ZipEntry"/> based on the <paramref name="fileName"/>.</returns>
        public ZipEntry MakeFileEntry(string fileName, bool useFileSystem)
        {
            ZipEntry result = new ZipEntry(nameTransform_.TransformFile(fileName));
            result.IsUnicodeText = isUnicodeText_;

            int externalAttributes = 0;
            bool useAttributes = (setAttributes_ != 0);

            FileInfo fi = null;
            if (useFileSystem)
            {
                fi = new FileInfo(fileName);
            }

            if ((fi != null) && fi.Exists)
            {
                switch (timeSetting_)
                {
                    case TimeSetting.CreateTime:
                        result.DateTime = fi.CreationTime;
                        break;

                    case TimeSetting.CreateTimeUtc:
            #if NETCF_1_0 || NETCF_2_0
                        result.DateTime = fi.CreationTime.ToUniversalTime();
            #else
                        result.DateTime = fi.CreationTimeUtc;
            #endif
                        break;

                    case TimeSetting.LastAccessTime:
                        result.DateTime = fi.LastAccessTime;
                        break;

                    case TimeSetting.LastAccessTimeUtc:
            #if NETCF_1_0 || NETCF_2_0
                        result.DateTime = fi.LastAccessTime.ToUniversalTime();
            #else
                        result.DateTime = fi.LastAccessTimeUtc;
            #endif
                        break;

                    case TimeSetting.LastWriteTime:
                        result.DateTime = fi.LastWriteTime;
                        break;

                    case TimeSetting.LastWriteTimeUtc:
            #if NETCF_1_0 || NETCF_2_0
                        result.DateTime = fi.LastWriteTime.ToUniversalTime();
            #else
                        result.DateTime = fi.LastWriteTimeUtc;
            #endif
                        break;

                    case TimeSetting.Fixed:
                        result.DateTime = fixedDateTime_;
                        break;

                    default:
                        throw new ZipException("Unhandled time setting in MakeFileEntry");
                }

                result.Size = fi.Length;

                useAttributes = true;
                externalAttributes = ((int)fi.Attributes & getAttributes_);
            }
            else
            {
                if (timeSetting_ == TimeSetting.Fixed)
                {
                    result.DateTime = fixedDateTime_;
                }
            }

            if (useAttributes)
            {
                externalAttributes |= setAttributes_;
                result.ExternalFileAttributes = externalAttributes;
            }

            return result;
        }
        /// <summary>
        /// Make a new <see cref="ZipEntry"></see> for a directory.
        /// </summary>
        /// <param name="directoryName">The raw untransformed name for the new directory</param>
        /// <param name="useFileSystem">If true entry detail is retrieved from the file system if the file exists.</param>
        /// <returns>Returns a new <see cref="ZipEntry"></see> representing a directory.</returns>
        public ZipEntry MakeDirectoryEntry(string directoryName, bool useFileSystem)
        {
            ZipEntry result = new ZipEntry(nameTransform_.TransformDirectory(directoryName));
            result.IsUnicodeText = isUnicodeText_;
            result.Size = 0;

            int externalAttributes = 0;

            DirectoryInfo di = null;

            if (useFileSystem)
            {
                di = new DirectoryInfo(directoryName);
            }

            if ((di != null) && di.Exists)
            {
                switch (timeSetting_)
                {
                    case TimeSetting.CreateTime:
                        result.DateTime = di.CreationTime;
                        break;

                    case TimeSetting.CreateTimeUtc:
            #if NETCF_1_0 || NETCF_2_0
                        result.DateTime = di.CreationTime.ToUniversalTime();
            #else
                        result.DateTime = di.CreationTimeUtc;
            #endif
                        break;

                    case TimeSetting.LastAccessTime:
                        result.DateTime = di.LastAccessTime;
                        break;

                    case TimeSetting.LastAccessTimeUtc:
            #if NETCF_1_0 || NETCF_2_0
                        result.DateTime = di.LastAccessTime.ToUniversalTime();
            #else
                        result.DateTime = di.LastAccessTimeUtc;
            #endif
                        break;

                    case TimeSetting.LastWriteTime:
                        result.DateTime = di.LastWriteTime;
                        break;

                    case TimeSetting.LastWriteTimeUtc:
            #if NETCF_1_0 || NETCF_2_0
                        result.DateTime = di.LastWriteTime.ToUniversalTime();
            #else
                        result.DateTime = di.LastWriteTimeUtc;
            #endif
                        break;

                    case TimeSetting.Fixed:
                        result.DateTime = fixedDateTime_;
                        break;

                    default:
                        throw new ZipException("Unhandled time setting in MakeDirectoryEntry");
                }

                externalAttributes = ((int)di.Attributes & getAttributes_);
            }
            else
            {
                if (timeSetting_ == TimeSetting.Fixed)
                {
                    result.DateTime = fixedDateTime_;
                }
            }

            // Always set directory attribute on.
            externalAttributes |= (setAttributes_ | 16);
            result.ExternalFileAttributes = externalAttributes;

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

            base.Close();
        }