FormatVersion.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / IO / Packaging / CompoundFile / FormatVersion.cs / 1305600 / FormatVersion.cs

                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//  Implementation of the FormatVersion class, which describes the versioning 
//  of an individual "format feature" within a compound file.
// 
// History:
//  06/20/2002: [....]:  Created
//  05/30/2003: LGolding: Ported to WCP tree.
// 
//-----------------------------------------------------------------------------
 
// Allow use of presharp warning numbers [6506] and [6518] unknown to the compiler 
#pragma warning disable 1634, 1691
 
using System;
using System.IO;

#if PBTCOMPILER 
using MS.Utility;     // For SR.cs
#else 
using System.Windows; 
using MS.Internal.WindowsBase; // FriendAccessAllowed
#endif 

namespace MS.Internal.IO.Packaging.CompoundFile
{
    ///Class for manipulating version object 
#if !PBTCOMPILER
    [FriendAccessAllowed] 
#endif 
    internal class FormatVersion
    { 
        //-----------------------------------------------------
        //
        //  Public Constructors
        // 
        //-----------------------------------------------------
 
        #region Constructors 

#if !PBTCOMPILER 
        /// 
        /// Constructor for FormatVersion
        /// 
        private FormatVersion() 
        {
        } 
#endif 

        ///  
        /// Constructor for FormatVersion with given featureId and version
        /// 
        /// feature identifier
        /// version 
        /// reader, updater, and writer versions are set to version
        public FormatVersion(string featureId, VersionPair version) 
            : this(featureId, version, version, version) 
        {
        } 

        /// 
        /// Constructor for FormatVersion with given featureId and reader, updater,
        /// and writer version 
        /// 
        /// feature identifier 
        /// Writer Version 
        /// Reader Version
        /// Updater Version 
        public FormatVersion(String featureId,
                                VersionPair writerVersion,
                                VersionPair readerVersion,
                                VersionPair updaterVersion) 
        {
            if (featureId == null) 
                throw new ArgumentNullException("featureId"); 
            if (writerVersion == null)
                throw new ArgumentNullException("writerVersion"); 
            if (readerVersion == null)
                throw new ArgumentNullException("readerVersion");
            if (updaterVersion == null)
                throw new ArgumentNullException("updaterVersion"); 

            if (featureId.Length == 0) 
            { 
                throw new ArgumentException(SR.Get(SRID.ZeroLengthFeatureID));
            } 

            _featureIdentifier = featureId;
            _reader = readerVersion;
            _updater = updaterVersion; 
            _writer = writerVersion;
        } 
 
        #endregion Constructors
 
        //------------------------------------------------------
        //
        //  Public Properties
        // 
        //-----------------------------------------------------
 
        #region Public Properties 

#if !PBTCOMPILER 
        /// 
        /// reader version
        /// 
        public VersionPair ReaderVersion 
        {
            get 
            { 
                return _reader;
            } 

            set
            {
                if (value == null) 
                {
                    throw new ArgumentNullException("value"); 
                } 

                _reader = value; 
            }
        }

        ///  
        /// writer version
        ///  
        public VersionPair WriterVersion 
        {
            get 
            {
                return _writer;
            }
            set 
            {
                if (value == null) 
                { 
                    throw new ArgumentNullException("value");
                } 

                _writer = value;
            }
        } 

        ///  
        /// updater version 
        /// 
        public VersionPair UpdaterVersion 
        {
            get
            {
                return _updater; 
            }
 
            set 
            {
                if (value == null) 
                {
                    throw new ArgumentNullException("value");
                }
 
                _updater = value;
            } 
        } 

        ///  
        /// feature identifier
        /// 
        public String FeatureIdentifier
        { 
            get
            { 
                return _featureIdentifier; 
            }
        } 
#endif

        #endregion Public Properties
 
        #region Operators
 
#if false 
        /// 
        /// == comparison operator 
        /// 
        /// version to be compared
        /// version to be compared
        public static bool operator ==(FormatVersion v1, FormatVersion v2) 
        {
            // We have to cast v1 and v2 to Object 
            //  to ensure that the == operator on Ojbect class is used not the == operator on FormatVersion 
            if ((Object) v1 == null || (Object) v2 == null)
            { 
                return ((Object) v1 == null && (Object) v2 == null);
            }

            // Do comparison only if both v1 and v2 are not null 
            return v1.Equals(v2);
        } 
 
        /// 
        /// != comparison operator 
        /// 
        /// version to be compared
        /// version to be compared
        public static bool operator !=(FormatVersion v1, FormatVersion v2) 
        {
            return !(v1 == v2); 
        } 

        ///  
        /// Eaual comparison operator
        /// 
        /// Object to compare
        /// ture if the object is equal to this instance 
        public override bool Equals(Object obj)
        { 
            if (obj == null) 
            {
                return false; 
            }

            if (obj.GetType() != typeof(FormatVersion))
            { 
                return false;
            } 
 
            FormatVersion v = (FormatVersion) obj;
 
            //PRESHARP:Parameter to this public method must be validated:  A null-dereference can occur here.
            //    Parameter 'v' to this public method must be validated:  A null-dereference can occur here.
            //This is a false positive as the checks above can gurantee no null dereference will occur
#pragma warning disable 6506 
            if (String.CompareOrdinal(_featureIdentifier.ToUpperInvariant(), v.FeatureIdentifier.ToUpperInvariant()) != 0
                || _reader != v.ReaderVersion 
                || _writer != v.WriterVersion 
                || _updater != v.UpdaterVersion)
            { 
                return false;
            }
#pragma warning restore 6506
 
            return true;
        } 
 
        /// 
        /// Hash code 
        /// 
        public override int GetHashCode()
        {
 
            int hash = _reader.Major & HashMask;
 
            hash <<= 5; 
            hash |= (_reader.Minor & HashMask);
            hash <<= 5; 
            hash |= (_updater.Major & HashMask);
            hash <<= 5;
            hash |= (_updater.Minor & HashMask);
            hash <<= 5; 
            hash |= (_writer.Major & HashMask);
            hash <<= 5; 
            hash |= (_writer.Minor & HashMask); 

            return hash; 
        }
#endif

        #endregion Operators 

        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //------------------------------------------------------

        #region Public Methods
 
#if !PBTCOMPILER
        ///  
        /// Constructor for FormatVersion with information read from the given stream 
        /// 
        /// Stream where version information is read from 
        /// Before this function call the current position of stream should be
        /// pointing to the begining of the version structure. After this call the current
        /// poisition will be pointing immediately after the version structure
        public static FormatVersion LoadFromStream(Stream stream) 
        {
            int bytesRead; 
 
            return LoadFromStream(stream, out bytesRead);
        } 
#endif

        /// 
        /// Persist format version to the given stream 
        /// 
        /// the stream to be written 
        ///  
        /// This operation will change the stream pointer
        /// stream can be null and will still return the number of bytes to be written 
        /// 
        public int SaveToStream(Stream stream)
        {
            checked 
            {
                // Suppress 56518 Local IDisposable object not disposed: 
                // Reason: The stream is not owned by the BlockManager, therefore we can 
                // close the BinaryWriter as it will Close the stream underneath.
#pragma warning disable 6518 
                int len = 0;
                BinaryWriter binarywriter = null;
#pragma warning restore 6518
                if (stream != null) 
                {
                    binarywriter = new BinaryWriter(stream, System.Text.Encoding.Unicode); 
                } 

                // ************ 
                //  feature ID
                // ************

                len += ContainerUtilities.WriteByteLengthPrefixedDWordPaddedUnicodeString(binarywriter, _featureIdentifier); 

                // **************** 
                //  Reader Version 
                // ****************
 
                if (stream != null)
                {
                    binarywriter.Write(_reader.Major);   // Major number
                    binarywriter.Write(_reader.Minor);   // Minor number 
                }
 
                len += ContainerUtilities.Int16Size; 
                len += ContainerUtilities.Int16Size;
 
                // *****************
                //  Updater Version
                // *****************
 
                if (stream != null)
                { 
                    binarywriter.Write(_updater.Major);   // Major number 
                    binarywriter.Write(_updater.Minor);   // Minor number
                } 

                len += ContainerUtilities.Int16Size;
                len += ContainerUtilities.Int16Size;
 
                // ****************
                //  Writer Version 
                // **************** 

                if (stream != null) 
                {
                    binarywriter.Write(_writer.Major);   // Major number
                    binarywriter.Write(_writer.Minor);   // Minor number
                } 

                len += ContainerUtilities.Int16Size; 
                len += ContainerUtilities.Int16Size; 

                return len; 
            }
        }

#if !PBTCOMPILER 
        /// 
        /// Check if a component with the given version can read this format version safely 
        ///  
        /// version of a component
        /// true if this format version can be read safely by the component 
        /// with the given version, otherwise false
        /// 
        /// The given version is checked against ReaderVersion
        ///  
        public bool IsReadableBy(VersionPair version)
        { 
            if (version == null) 
            {
                throw new ArgumentNullException("version"); 
            }

            return (_reader <= version);
        } 

        ///  
        /// Check if a component with the given version can update this format version safely 
        /// 
        /// version of a component 
        /// true if this format version can be updated safely by the component
        /// with the given version, otherwise false
        /// 
        /// The given version is checked against UpdaterVersion 
        /// 
        public bool IsUpdatableBy(VersionPair version) 
        { 
            if (version == null)
            { 
                throw new ArgumentNullException("version");
            }

            return (_updater <= version); 
        }
#endif 
 
        #endregion Public Methods
 
        //-----------------------------------------------------
        //
        //  Public Events
        // 
        //------------------------------------------------------
        // None 
        //----------------------------------------------------- 
        //
        //  Internal Constructors 
        //
        //-----------------------------------------------------
        // None
        //----------------------------------------------------- 
        //
        //  Internal Properties 
        // 
        //------------------------------------------------------
        // None 
        //-----------------------------------------------------
        //
        //  Internal Methods
        // 
        //------------------------------------------------------
#if !PBTCOMPILER 
        ///  
        /// Constructor for FormatVersion with information read from the given BinaryReader
        ///  
        /// BinaryReader where version information is read from
        /// number of bytes read including padding
        /// FormatVersion object
        ///  
        /// This operation will change the stream pointer. This function is preferred over the
        /// LoadFromStream as it doesn't leave around Undisposed BinaryReader, which 
        /// LoadFromStream will 
        /// 
        private static FormatVersion LoadFromBinaryReader(BinaryReader reader, out Int32 bytesRead) 
        {
            checked
            {
                if (reader == null) 
                {
                    throw new ArgumentNullException("reader"); 
                } 

                FormatVersion ver = new FormatVersion(); 

                bytesRead = 0;            // Initialize the number of bytes read

                // ************** 
                //  feature ID
                // ************** 
 
                Int32 strBytes;
 
                ver._featureIdentifier = ContainerUtilities.ReadByteLengthPrefixedDWordPaddedUnicodeString(reader, out strBytes);
                bytesRead += strBytes;

                Int16 major; 
                Int16 minor;
 
                // **************** 
                //  Reader Version
                // **************** 

                major = reader.ReadInt16();   // Major number
                bytesRead += ContainerUtilities.Int16Size;
                minor = reader.ReadInt16();   // Minor number 
                bytesRead += ContainerUtilities.Int16Size;
 
                ver.ReaderVersion = new VersionPair(major, minor); 

                // ***************** 
                //  Updater Version
                // *****************

                major = reader.ReadInt16();   // Major number 
                bytesRead += ContainerUtilities.Int16Size;
                minor = reader.ReadInt16();   // Minor number 
                bytesRead += ContainerUtilities.Int16Size; 

                ver.UpdaterVersion = new VersionPair(major, minor); 

                // ****************
                //  Writer Version
                // **************** 

                major = reader.ReadInt16();   // Major number 
                bytesRead += ContainerUtilities.Int16Size; 
                minor = reader.ReadInt16();   // Minor number
                bytesRead += ContainerUtilities.Int16Size; 

                ver.WriterVersion = new VersionPair(major, minor);

                return ver; 
            }
        } 
 
        /// 
        /// Create FormatVersion object and read version information from the given stream 
        /// 
        /// the stream to read version information from
        /// number of bytes read including padding
        /// FormatVersion object 
        /// 
        /// This operation will change the stream pointer. This function shouldn't be 
        /// used in the scenarios when LoadFromBinaryReader can do the job. 
        /// LoadFromBinaryReader will not leave around any undisposed objects,
        /// and LoadFromStream will. 
        /// 
        internal static FormatVersion LoadFromStream(Stream stream, out Int32 bytesRead)
        {
            if (stream == null) 
            {
                throw new ArgumentNullException("stream"); 
            } 
            // Suppress 56518 Local IDisposable object not disposed:
            // Reason: The stream is not owned by the BlockManager, therefore we can 
            // close the BinaryWriter as it will Close the stream underneath.
#pragma warning disable 6518
            BinaryReader streamReader = new BinaryReader(stream, System.Text.Encoding.Unicode);
#pragma warning restore 6518 

            return LoadFromBinaryReader(streamReader, out bytesRead); 
        } 
#endif
 
        //------------------------------------------------------
        //
        //  Internal Events
        // 
        //-----------------------------------------------------
        // None 
        //------------------------------------------------------ 
        //
        //  Private Methods 
        //
        //-----------------------------------------------------
        // None
        //----------------------------------------------------- 
        //
        //  Private Fields 
        // 
        //-----------------------------------------------------
 
        #region Member Variables

        private VersionPair _reader;
        private VersionPair _updater; 
        private VersionPair _writer;
 
        private String _featureIdentifier; 

#if false 
        static private readonly int HashMask = 0x1f;
#endif

        #endregion Member Variables 

    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//  Implementation of the FormatVersion class, which describes the versioning 
//  of an individual "format feature" within a compound file.
// 
// History:
//  06/20/2002: [....]:  Created
//  05/30/2003: LGolding: Ported to WCP tree.
// 
//-----------------------------------------------------------------------------
 
// Allow use of presharp warning numbers [6506] and [6518] unknown to the compiler 
#pragma warning disable 1634, 1691
 
using System;
using System.IO;

#if PBTCOMPILER 
using MS.Utility;     // For SR.cs
#else 
using System.Windows; 
using MS.Internal.WindowsBase; // FriendAccessAllowed
#endif 

namespace MS.Internal.IO.Packaging.CompoundFile
{
    ///Class for manipulating version object 
#if !PBTCOMPILER
    [FriendAccessAllowed] 
#endif 
    internal class FormatVersion
    { 
        //-----------------------------------------------------
        //
        //  Public Constructors
        // 
        //-----------------------------------------------------
 
        #region Constructors 

#if !PBTCOMPILER 
        /// 
        /// Constructor for FormatVersion
        /// 
        private FormatVersion() 
        {
        } 
#endif 

        ///  
        /// Constructor for FormatVersion with given featureId and version
        /// 
        /// feature identifier
        /// version 
        /// reader, updater, and writer versions are set to version
        public FormatVersion(string featureId, VersionPair version) 
            : this(featureId, version, version, version) 
        {
        } 

        /// 
        /// Constructor for FormatVersion with given featureId and reader, updater,
        /// and writer version 
        /// 
        /// feature identifier 
        /// Writer Version 
        /// Reader Version
        /// Updater Version 
        public FormatVersion(String featureId,
                                VersionPair writerVersion,
                                VersionPair readerVersion,
                                VersionPair updaterVersion) 
        {
            if (featureId == null) 
                throw new ArgumentNullException("featureId"); 
            if (writerVersion == null)
                throw new ArgumentNullException("writerVersion"); 
            if (readerVersion == null)
                throw new ArgumentNullException("readerVersion");
            if (updaterVersion == null)
                throw new ArgumentNullException("updaterVersion"); 

            if (featureId.Length == 0) 
            { 
                throw new ArgumentException(SR.Get(SRID.ZeroLengthFeatureID));
            } 

            _featureIdentifier = featureId;
            _reader = readerVersion;
            _updater = updaterVersion; 
            _writer = writerVersion;
        } 
 
        #endregion Constructors
 
        //------------------------------------------------------
        //
        //  Public Properties
        // 
        //-----------------------------------------------------
 
        #region Public Properties 

#if !PBTCOMPILER 
        /// 
        /// reader version
        /// 
        public VersionPair ReaderVersion 
        {
            get 
            { 
                return _reader;
            } 

            set
            {
                if (value == null) 
                {
                    throw new ArgumentNullException("value"); 
                } 

                _reader = value; 
            }
        }

        ///  
        /// writer version
        ///  
        public VersionPair WriterVersion 
        {
            get 
            {
                return _writer;
            }
            set 
            {
                if (value == null) 
                { 
                    throw new ArgumentNullException("value");
                } 

                _writer = value;
            }
        } 

        ///  
        /// updater version 
        /// 
        public VersionPair UpdaterVersion 
        {
            get
            {
                return _updater; 
            }
 
            set 
            {
                if (value == null) 
                {
                    throw new ArgumentNullException("value");
                }
 
                _updater = value;
            } 
        } 

        ///  
        /// feature identifier
        /// 
        public String FeatureIdentifier
        { 
            get
            { 
                return _featureIdentifier; 
            }
        } 
#endif

        #endregion Public Properties
 
        #region Operators
 
#if false 
        /// 
        /// == comparison operator 
        /// 
        /// version to be compared
        /// version to be compared
        public static bool operator ==(FormatVersion v1, FormatVersion v2) 
        {
            // We have to cast v1 and v2 to Object 
            //  to ensure that the == operator on Ojbect class is used not the == operator on FormatVersion 
            if ((Object) v1 == null || (Object) v2 == null)
            { 
                return ((Object) v1 == null && (Object) v2 == null);
            }

            // Do comparison only if both v1 and v2 are not null 
            return v1.Equals(v2);
        } 
 
        /// 
        /// != comparison operator 
        /// 
        /// version to be compared
        /// version to be compared
        public static bool operator !=(FormatVersion v1, FormatVersion v2) 
        {
            return !(v1 == v2); 
        } 

        ///  
        /// Eaual comparison operator
        /// 
        /// Object to compare
        /// ture if the object is equal to this instance 
        public override bool Equals(Object obj)
        { 
            if (obj == null) 
            {
                return false; 
            }

            if (obj.GetType() != typeof(FormatVersion))
            { 
                return false;
            } 
 
            FormatVersion v = (FormatVersion) obj;
 
            //PRESHARP:Parameter to this public method must be validated:  A null-dereference can occur here.
            //    Parameter 'v' to this public method must be validated:  A null-dereference can occur here.
            //This is a false positive as the checks above can gurantee no null dereference will occur
#pragma warning disable 6506 
            if (String.CompareOrdinal(_featureIdentifier.ToUpperInvariant(), v.FeatureIdentifier.ToUpperInvariant()) != 0
                || _reader != v.ReaderVersion 
                || _writer != v.WriterVersion 
                || _updater != v.UpdaterVersion)
            { 
                return false;
            }
#pragma warning restore 6506
 
            return true;
        } 
 
        /// 
        /// Hash code 
        /// 
        public override int GetHashCode()
        {
 
            int hash = _reader.Major & HashMask;
 
            hash <<= 5; 
            hash |= (_reader.Minor & HashMask);
            hash <<= 5; 
            hash |= (_updater.Major & HashMask);
            hash <<= 5;
            hash |= (_updater.Minor & HashMask);
            hash <<= 5; 
            hash |= (_writer.Major & HashMask);
            hash <<= 5; 
            hash |= (_writer.Minor & HashMask); 

            return hash; 
        }
#endif

        #endregion Operators 

        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //------------------------------------------------------

        #region Public Methods
 
#if !PBTCOMPILER
        ///  
        /// Constructor for FormatVersion with information read from the given stream 
        /// 
        /// Stream where version information is read from 
        /// Before this function call the current position of stream should be
        /// pointing to the begining of the version structure. After this call the current
        /// poisition will be pointing immediately after the version structure
        public static FormatVersion LoadFromStream(Stream stream) 
        {
            int bytesRead; 
 
            return LoadFromStream(stream, out bytesRead);
        } 
#endif

        /// 
        /// Persist format version to the given stream 
        /// 
        /// the stream to be written 
        ///  
        /// This operation will change the stream pointer
        /// stream can be null and will still return the number of bytes to be written 
        /// 
        public int SaveToStream(Stream stream)
        {
            checked 
            {
                // Suppress 56518 Local IDisposable object not disposed: 
                // Reason: The stream is not owned by the BlockManager, therefore we can 
                // close the BinaryWriter as it will Close the stream underneath.
#pragma warning disable 6518 
                int len = 0;
                BinaryWriter binarywriter = null;
#pragma warning restore 6518
                if (stream != null) 
                {
                    binarywriter = new BinaryWriter(stream, System.Text.Encoding.Unicode); 
                } 

                // ************ 
                //  feature ID
                // ************

                len += ContainerUtilities.WriteByteLengthPrefixedDWordPaddedUnicodeString(binarywriter, _featureIdentifier); 

                // **************** 
                //  Reader Version 
                // ****************
 
                if (stream != null)
                {
                    binarywriter.Write(_reader.Major);   // Major number
                    binarywriter.Write(_reader.Minor);   // Minor number 
                }
 
                len += ContainerUtilities.Int16Size; 
                len += ContainerUtilities.Int16Size;
 
                // *****************
                //  Updater Version
                // *****************
 
                if (stream != null)
                { 
                    binarywriter.Write(_updater.Major);   // Major number 
                    binarywriter.Write(_updater.Minor);   // Minor number
                } 

                len += ContainerUtilities.Int16Size;
                len += ContainerUtilities.Int16Size;
 
                // ****************
                //  Writer Version 
                // **************** 

                if (stream != null) 
                {
                    binarywriter.Write(_writer.Major);   // Major number
                    binarywriter.Write(_writer.Minor);   // Minor number
                } 

                len += ContainerUtilities.Int16Size; 
                len += ContainerUtilities.Int16Size; 

                return len; 
            }
        }

#if !PBTCOMPILER 
        /// 
        /// Check if a component with the given version can read this format version safely 
        ///  
        /// version of a component
        /// true if this format version can be read safely by the component 
        /// with the given version, otherwise false
        /// 
        /// The given version is checked against ReaderVersion
        ///  
        public bool IsReadableBy(VersionPair version)
        { 
            if (version == null) 
            {
                throw new ArgumentNullException("version"); 
            }

            return (_reader <= version);
        } 

        ///  
        /// Check if a component with the given version can update this format version safely 
        /// 
        /// version of a component 
        /// true if this format version can be updated safely by the component
        /// with the given version, otherwise false
        /// 
        /// The given version is checked against UpdaterVersion 
        /// 
        public bool IsUpdatableBy(VersionPair version) 
        { 
            if (version == null)
            { 
                throw new ArgumentNullException("version");
            }

            return (_updater <= version); 
        }
#endif 
 
        #endregion Public Methods
 
        //-----------------------------------------------------
        //
        //  Public Events
        // 
        //------------------------------------------------------
        // None 
        //----------------------------------------------------- 
        //
        //  Internal Constructors 
        //
        //-----------------------------------------------------
        // None
        //----------------------------------------------------- 
        //
        //  Internal Properties 
        // 
        //------------------------------------------------------
        // None 
        //-----------------------------------------------------
        //
        //  Internal Methods
        // 
        //------------------------------------------------------
#if !PBTCOMPILER 
        ///  
        /// Constructor for FormatVersion with information read from the given BinaryReader
        ///  
        /// BinaryReader where version information is read from
        /// number of bytes read including padding
        /// FormatVersion object
        ///  
        /// This operation will change the stream pointer. This function is preferred over the
        /// LoadFromStream as it doesn't leave around Undisposed BinaryReader, which 
        /// LoadFromStream will 
        /// 
        private static FormatVersion LoadFromBinaryReader(BinaryReader reader, out Int32 bytesRead) 
        {
            checked
            {
                if (reader == null) 
                {
                    throw new ArgumentNullException("reader"); 
                } 

                FormatVersion ver = new FormatVersion(); 

                bytesRead = 0;            // Initialize the number of bytes read

                // ************** 
                //  feature ID
                // ************** 
 
                Int32 strBytes;
 
                ver._featureIdentifier = ContainerUtilities.ReadByteLengthPrefixedDWordPaddedUnicodeString(reader, out strBytes);
                bytesRead += strBytes;

                Int16 major; 
                Int16 minor;
 
                // **************** 
                //  Reader Version
                // **************** 

                major = reader.ReadInt16();   // Major number
                bytesRead += ContainerUtilities.Int16Size;
                minor = reader.ReadInt16();   // Minor number 
                bytesRead += ContainerUtilities.Int16Size;
 
                ver.ReaderVersion = new VersionPair(major, minor); 

                // ***************** 
                //  Updater Version
                // *****************

                major = reader.ReadInt16();   // Major number 
                bytesRead += ContainerUtilities.Int16Size;
                minor = reader.ReadInt16();   // Minor number 
                bytesRead += ContainerUtilities.Int16Size; 

                ver.UpdaterVersion = new VersionPair(major, minor); 

                // ****************
                //  Writer Version
                // **************** 

                major = reader.ReadInt16();   // Major number 
                bytesRead += ContainerUtilities.Int16Size; 
                minor = reader.ReadInt16();   // Minor number
                bytesRead += ContainerUtilities.Int16Size; 

                ver.WriterVersion = new VersionPair(major, minor);

                return ver; 
            }
        } 
 
        /// 
        /// Create FormatVersion object and read version information from the given stream 
        /// 
        /// the stream to read version information from
        /// number of bytes read including padding
        /// FormatVersion object 
        /// 
        /// This operation will change the stream pointer. This function shouldn't be 
        /// used in the scenarios when LoadFromBinaryReader can do the job. 
        /// LoadFromBinaryReader will not leave around any undisposed objects,
        /// and LoadFromStream will. 
        /// 
        internal static FormatVersion LoadFromStream(Stream stream, out Int32 bytesRead)
        {
            if (stream == null) 
            {
                throw new ArgumentNullException("stream"); 
            } 
            // Suppress 56518 Local IDisposable object not disposed:
            // Reason: The stream is not owned by the BlockManager, therefore we can 
            // close the BinaryWriter as it will Close the stream underneath.
#pragma warning disable 6518
            BinaryReader streamReader = new BinaryReader(stream, System.Text.Encoding.Unicode);
#pragma warning restore 6518 

            return LoadFromBinaryReader(streamReader, out bytesRead); 
        } 
#endif
 
        //------------------------------------------------------
        //
        //  Internal Events
        // 
        //-----------------------------------------------------
        // None 
        //------------------------------------------------------ 
        //
        //  Private Methods 
        //
        //-----------------------------------------------------
        // None
        //----------------------------------------------------- 
        //
        //  Private Fields 
        // 
        //-----------------------------------------------------
 
        #region Member Variables

        private VersionPair _reader;
        private VersionPair _updater; 
        private VersionPair _writer;
 
        private String _featureIdentifier; 

#if false 
        static private readonly int HashMask = 0x1f;
#endif

        #endregion Member Variables 

    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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